1 13b2bc37 2022-10-23 stsp /*
   2 13b2bc37 2022-10-23 stsp  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
   3 13b2bc37 2022-10-23 stsp  *
   4 13b2bc37 2022-10-23 stsp  * Permission to use, copy, modify, and distribute this software for any
   5 13b2bc37 2022-10-23 stsp  * purpose with or without fee is hereby granted, provided that the above
   6 13b2bc37 2022-10-23 stsp  * copyright notice and this permission notice appear in all copies.
   7 13b2bc37 2022-10-23 stsp  *
   8 13b2bc37 2022-10-23 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 13b2bc37 2022-10-23 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 13b2bc37 2022-10-23 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 13b2bc37 2022-10-23 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 13b2bc37 2022-10-23 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 13b2bc37 2022-10-23 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 13b2bc37 2022-10-23 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 13b2bc37 2022-10-23 stsp  */
  16 13b2bc37 2022-10-23 stsp 
  17 13b2bc37 2022-10-23 stsp #include <sys/queue.h>
  18 13b2bc37 2022-10-23 stsp #include <sys/tree.h>
  19 13b2bc37 2022-10-23 stsp #include <sys/time.h>
  20 13b2bc37 2022-10-23 stsp #include <sys/types.h>
  21 13b2bc37 2022-10-23 stsp #include <sys/stat.h>
  22 13b2bc37 2022-10-23 stsp #include <sys/socket.h>
  23 13b2bc37 2022-10-23 stsp #include <sys/un.h>
  24 13b2bc37 2022-10-23 stsp #include <sys/wait.h>
  25 13b2bc37 2022-10-23 stsp 
  26 13b2bc37 2022-10-23 stsp #include <fcntl.h>
  27 13b2bc37 2022-10-23 stsp #include <err.h>
  28 13b2bc37 2022-10-23 stsp #include <errno.h>
  29 13b2bc37 2022-10-23 stsp #include <event.h>
  30 13b2bc37 2022-10-23 stsp #include <limits.h>
  31 13b2bc37 2022-10-23 stsp #include <pwd.h>
  32 13b2bc37 2022-10-23 stsp #include <imsg.h>
  33 13b2bc37 2022-10-23 stsp #include <sha1.h>
  34 5822e79e 2023-02-23 op #include <sha2.h>
  35 13b2bc37 2022-10-23 stsp #include <signal.h>
  36 13b2bc37 2022-10-23 stsp #include <siphash.h>
  37 13b2bc37 2022-10-23 stsp #include <stdarg.h>
  38 13b2bc37 2022-10-23 stsp #include <stdio.h>
  39 13b2bc37 2022-10-23 stsp #include <stdlib.h>
  40 13b2bc37 2022-10-23 stsp #include <string.h>
  41 13b2bc37 2022-10-23 stsp #include <syslog.h>
  42 13b2bc37 2022-10-23 stsp #include <unistd.h>
  43 13b2bc37 2022-10-23 stsp 
  44 13b2bc37 2022-10-23 stsp #include "got_error.h"
  45 13b2bc37 2022-10-23 stsp #include "got_opentemp.h"
  46 13b2bc37 2022-10-23 stsp #include "got_path.h"
  47 13b2bc37 2022-10-23 stsp #include "got_repository.h"
  48 13b2bc37 2022-10-23 stsp #include "got_object.h"
  49 13b2bc37 2022-10-23 stsp #include "got_reference.h"
  50 13b2bc37 2022-10-23 stsp 
  51 13b2bc37 2022-10-23 stsp #include "got_lib_delta.h"
  52 13b2bc37 2022-10-23 stsp #include "got_lib_object.h"
  53 13b2bc37 2022-10-23 stsp #include "got_lib_object_cache.h"
  54 53bf0b54 2023-02-23 op #include "got_lib_hash.h"
  55 13b2bc37 2022-10-23 stsp #include "got_lib_gitproto.h"
  56 13b2bc37 2022-10-23 stsp #include "got_lib_pack.h"
  57 13b2bc37 2022-10-23 stsp #include "got_lib_repository.h"
  58 13b2bc37 2022-10-23 stsp 
  59 13b2bc37 2022-10-23 stsp #include "gotd.h"
  60 13b2bc37 2022-10-23 stsp #include "log.h"
  61 d93ecf7d 2022-12-14 stsp #include "listen.h"
  62 0ccf3acb 2022-11-16 stsp #include "auth.h"
  63 ae7c1b78 2023-01-10 stsp #include "session.h"
  64 13b2bc37 2022-10-23 stsp #include "repo_read.h"
  65 13b2bc37 2022-10-23 stsp #include "repo_write.h"
  66 13b2bc37 2022-10-23 stsp 
  67 13b2bc37 2022-10-23 stsp #ifndef nitems
  68 13b2bc37 2022-10-23 stsp #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
  69 13b2bc37 2022-10-23 stsp #endif
  70 13b2bc37 2022-10-23 stsp 
  71 eac23c30 2023-01-10 stsp enum gotd_client_state {
  72 eac23c30 2023-01-10 stsp 	GOTD_CLIENT_STATE_NEW,
  73 eac23c30 2023-01-10 stsp 	GOTD_CLIENT_STATE_ACCESS_GRANTED,
  74 c929736a 2023-06-22 op };
  75 c929736a 2023-06-22 op 
  76 c929736a 2023-06-22 op struct gotd_child_proc {
  77 c929736a 2023-06-22 op 	pid_t				 pid;
  78 c929736a 2023-06-22 op 	enum gotd_procid		 type;
  79 c929736a 2023-06-22 op 	char				 repo_name[NAME_MAX];
  80 c929736a 2023-06-22 op 	char				 repo_path[PATH_MAX];
  81 c929736a 2023-06-22 op 	int				 pipe[2];
  82 c929736a 2023-06-22 op 	struct gotd_imsgev		 iev;
  83 839338f6 2023-06-22 op 	struct event			 tmo;
  84 839338f6 2023-06-22 op 
  85 839338f6 2023-06-22 op 	TAILQ_ENTRY(gotd_child_proc)	 entry;
  86 eac23c30 2023-01-10 stsp };
  87 839338f6 2023-06-22 op TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
  88 eac23c30 2023-01-10 stsp 
  89 13b2bc37 2022-10-23 stsp struct gotd_client {
  90 13b2bc37 2022-10-23 stsp 	STAILQ_ENTRY(gotd_client)	 entry;
  91 13b2bc37 2022-10-23 stsp 	enum gotd_client_state		 state;
  92 13b2bc37 2022-10-23 stsp 	uint32_t			 id;
  93 13b2bc37 2022-10-23 stsp 	int				 fd;
  94 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev		 iev;
  95 13b2bc37 2022-10-23 stsp 	struct event			 tmo;
  96 13b2bc37 2022-10-23 stsp 	uid_t				 euid;
  97 13b2bc37 2022-10-23 stsp 	gid_t				 egid;
  98 f7a854cf 2023-01-10 stsp 	struct gotd_child_proc		*repo;
  99 5e25db14 2022-12-29 stsp 	struct gotd_child_proc		*auth;
 100 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc		*session;
 101 5e25db14 2022-12-29 stsp 	int				 required_auth;
 102 13b2bc37 2022-10-23 stsp };
 103 13b2bc37 2022-10-23 stsp STAILQ_HEAD(gotd_clients, gotd_client);
 104 13b2bc37 2022-10-23 stsp 
 105 13b2bc37 2022-10-23 stsp static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
 106 13b2bc37 2022-10-23 stsp static SIPHASH_KEY clients_hash_key;
 107 13b2bc37 2022-10-23 stsp volatile int client_cnt;
 108 ef4e2f01 2022-12-29 stsp static struct timeval auth_timeout = { 5, 0 };
 109 13b2bc37 2022-10-23 stsp static struct gotd gotd;
 110 13b2bc37 2022-10-23 stsp 
 111 13b2bc37 2022-10-23 stsp void gotd_sighdlr(int sig, short event, void *arg);
 112 f1752522 2022-10-29 stsp static void gotd_shutdown(void);
 113 ae7c1b78 2023-01-10 stsp static const struct got_error *start_session_child(struct gotd_client *,
 114 ae7c1b78 2023-01-10 stsp     struct gotd_repo *, char *, const char *, int, int);
 115 b50a2b46 2022-12-29 stsp static const struct got_error *start_repo_child(struct gotd_client *,
 116 b50a2b46 2022-12-29 stsp     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
 117 5e25db14 2022-12-29 stsp static const struct got_error *start_auth_child(struct gotd_client *, int,
 118 5e25db14 2022-12-29 stsp     struct gotd_repo *, char *, const char *, int, int);
 119 b50a2b46 2022-12-29 stsp static void kill_proc(struct gotd_child_proc *, int);
 120 839338f6 2023-06-22 op static void disconnect(struct gotd_client *);
 121 13b2bc37 2022-10-23 stsp 
 122 13b2bc37 2022-10-23 stsp __dead static void
 123 575dc3f9 2023-02-09 op usage(void)
 124 13b2bc37 2022-10-23 stsp {
 125 e9e01966 2023-01-18 stsp 	fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
 126 88dec179 2022-10-24 stsp 	exit(1);
 127 13b2bc37 2022-10-23 stsp }
 128 13b2bc37 2022-10-23 stsp 
 129 13b2bc37 2022-10-23 stsp static int
 130 13b2bc37 2022-10-23 stsp unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
 131 13b2bc37 2022-10-23 stsp {
 132 13b2bc37 2022-10-23 stsp 	struct sockaddr_un sun;
 133 13b2bc37 2022-10-23 stsp 	int fd = -1;
 134 13b2bc37 2022-10-23 stsp 	mode_t old_umask, mode;
 135 13b2bc37 2022-10-23 stsp 
 136 13b2bc37 2022-10-23 stsp 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
 137 13b2bc37 2022-10-23 stsp 	if (fd == -1) {
 138 13b2bc37 2022-10-23 stsp 		log_warn("socket");
 139 13b2bc37 2022-10-23 stsp 		return -1;
 140 13b2bc37 2022-10-23 stsp 	}
 141 13b2bc37 2022-10-23 stsp 
 142 13b2bc37 2022-10-23 stsp 	sun.sun_family = AF_UNIX;
 143 13b2bc37 2022-10-23 stsp 	if (strlcpy(sun.sun_path, unix_socket_path,
 144 13b2bc37 2022-10-23 stsp 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
 145 13b2bc37 2022-10-23 stsp 		log_warnx("%s: name too long", unix_socket_path);
 146 13b2bc37 2022-10-23 stsp 		close(fd);
 147 13b2bc37 2022-10-23 stsp 		return -1;
 148 13b2bc37 2022-10-23 stsp 	}
 149 13b2bc37 2022-10-23 stsp 
 150 13b2bc37 2022-10-23 stsp 	if (unlink(unix_socket_path) == -1) {
 151 13b2bc37 2022-10-23 stsp 		if (errno != ENOENT) {
 152 13b2bc37 2022-10-23 stsp 			log_warn("unlink %s", unix_socket_path);
 153 13b2bc37 2022-10-23 stsp 			close(fd);
 154 13b2bc37 2022-10-23 stsp 			return -1;
 155 13b2bc37 2022-10-23 stsp 		}
 156 13b2bc37 2022-10-23 stsp 	}
 157 13b2bc37 2022-10-23 stsp 
 158 13b2bc37 2022-10-23 stsp 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
 159 6f854dde 2023-01-04 stsp 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
 160 13b2bc37 2022-10-23 stsp 
 161 13b2bc37 2022-10-23 stsp 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
 162 13b2bc37 2022-10-23 stsp 		log_warn("bind: %s", unix_socket_path);
 163 13b2bc37 2022-10-23 stsp 		close(fd);
 164 13b2bc37 2022-10-23 stsp 		umask(old_umask);
 165 13b2bc37 2022-10-23 stsp 		return -1;
 166 13b2bc37 2022-10-23 stsp 	}
 167 13b2bc37 2022-10-23 stsp 
 168 13b2bc37 2022-10-23 stsp 	umask(old_umask);
 169 13b2bc37 2022-10-23 stsp 
 170 13b2bc37 2022-10-23 stsp 	if (chmod(unix_socket_path, mode) == -1) {
 171 13b2bc37 2022-10-23 stsp 		log_warn("chmod %o %s", mode, unix_socket_path);
 172 13b2bc37 2022-10-23 stsp 		close(fd);
 173 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 174 13b2bc37 2022-10-23 stsp 		return -1;
 175 13b2bc37 2022-10-23 stsp 	}
 176 13b2bc37 2022-10-23 stsp 
 177 13b2bc37 2022-10-23 stsp 	if (chown(unix_socket_path, uid, gid) == -1) {
 178 13b2bc37 2022-10-23 stsp 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
 179 13b2bc37 2022-10-23 stsp 		close(fd);
 180 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 181 13b2bc37 2022-10-23 stsp 		return -1;
 182 13b2bc37 2022-10-23 stsp 	}
 183 13b2bc37 2022-10-23 stsp 
 184 13b2bc37 2022-10-23 stsp 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
 185 13b2bc37 2022-10-23 stsp 		log_warn("listen");
 186 13b2bc37 2022-10-23 stsp 		close(fd);
 187 13b2bc37 2022-10-23 stsp 		unlink(unix_socket_path);
 188 13b2bc37 2022-10-23 stsp 		return -1;
 189 13b2bc37 2022-10-23 stsp 	}
 190 13b2bc37 2022-10-23 stsp 
 191 13b2bc37 2022-10-23 stsp 	return fd;
 192 13b2bc37 2022-10-23 stsp }
 193 13b2bc37 2022-10-23 stsp 
 194 13b2bc37 2022-10-23 stsp static uint64_t
 195 13b2bc37 2022-10-23 stsp client_hash(uint32_t client_id)
 196 13b2bc37 2022-10-23 stsp {
 197 13b2bc37 2022-10-23 stsp 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
 198 13b2bc37 2022-10-23 stsp }
 199 13b2bc37 2022-10-23 stsp 
 200 13b2bc37 2022-10-23 stsp static void
 201 13b2bc37 2022-10-23 stsp add_client(struct gotd_client *client)
 202 13b2bc37 2022-10-23 stsp {
 203 13b2bc37 2022-10-23 stsp 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
 204 13b2bc37 2022-10-23 stsp 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
 205 13b2bc37 2022-10-23 stsp 	client_cnt++;
 206 13b2bc37 2022-10-23 stsp }
 207 13b2bc37 2022-10-23 stsp 
 208 13b2bc37 2022-10-23 stsp static struct gotd_client *
 209 13b2bc37 2022-10-23 stsp find_client(uint32_t client_id)
 210 13b2bc37 2022-10-23 stsp {
 211 13b2bc37 2022-10-23 stsp 	uint64_t slot;
 212 13b2bc37 2022-10-23 stsp 	struct gotd_client *c;
 213 13b2bc37 2022-10-23 stsp 
 214 13b2bc37 2022-10-23 stsp 	slot = client_hash(client_id) % nitems(gotd_clients);
 215 13b2bc37 2022-10-23 stsp 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 216 13b2bc37 2022-10-23 stsp 		if (c->id == client_id)
 217 13b2bc37 2022-10-23 stsp 			return c;
 218 13b2bc37 2022-10-23 stsp 	}
 219 13b2bc37 2022-10-23 stsp 
 220 13b2bc37 2022-10-23 stsp 	return NULL;
 221 13b2bc37 2022-10-23 stsp }
 222 13b2bc37 2022-10-23 stsp 
 223 b50a2b46 2022-12-29 stsp static struct gotd_client *
 224 b50a2b46 2022-12-29 stsp find_client_by_proc_fd(int fd)
 225 b50a2b46 2022-12-29 stsp {
 226 b50a2b46 2022-12-29 stsp 	uint64_t slot;
 227 b50a2b46 2022-12-29 stsp 
 228 b50a2b46 2022-12-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 229 b50a2b46 2022-12-29 stsp 		struct gotd_client *c;
 230 b50a2b46 2022-12-29 stsp 
 231 b50a2b46 2022-12-29 stsp 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 232 f7a854cf 2023-01-10 stsp 			if (c->repo && c->repo->iev.ibuf.fd == fd)
 233 b50a2b46 2022-12-29 stsp 				return c;
 234 5e25db14 2022-12-29 stsp 			if (c->auth && c->auth->iev.ibuf.fd == fd)
 235 ae7c1b78 2023-01-10 stsp 				return c;
 236 ae7c1b78 2023-01-10 stsp 			if (c->session && c->session->iev.ibuf.fd == fd)
 237 5e25db14 2022-12-29 stsp 				return c;
 238 b50a2b46 2022-12-29 stsp 		}
 239 b50a2b46 2022-12-29 stsp 	}
 240 f1752522 2022-10-29 stsp 
 241 13b2bc37 2022-10-23 stsp 	return NULL;
 242 13b2bc37 2022-10-23 stsp }
 243 13b2bc37 2022-10-23 stsp 
 244 13b2bc37 2022-10-23 stsp static int
 245 13b2bc37 2022-10-23 stsp client_is_reading(struct gotd_client *client)
 246 13b2bc37 2022-10-23 stsp {
 247 f7a854cf 2023-01-10 stsp 	return (client->required_auth &
 248 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
 249 13b2bc37 2022-10-23 stsp }
 250 13b2bc37 2022-10-23 stsp 
 251 13b2bc37 2022-10-23 stsp static int
 252 13b2bc37 2022-10-23 stsp client_is_writing(struct gotd_client *client)
 253 13b2bc37 2022-10-23 stsp {
 254 f7a854cf 2023-01-10 stsp 	return (client->required_auth &
 255 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
 256 f7a854cf 2023-01-10 stsp 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
 257 13b2bc37 2022-10-23 stsp }
 258 13b2bc37 2022-10-23 stsp 
 259 13b2bc37 2022-10-23 stsp static const struct got_error *
 260 13b2bc37 2022-10-23 stsp ensure_client_is_not_writing(struct gotd_client *client)
 261 13b2bc37 2022-10-23 stsp {
 262 13b2bc37 2022-10-23 stsp 	if (client_is_writing(client)) {
 263 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 264 13b2bc37 2022-10-23 stsp 		    "uid %d made a read-request but is writing to "
 265 13b2bc37 2022-10-23 stsp 		    "a repository", client->euid);
 266 13b2bc37 2022-10-23 stsp 	}
 267 13b2bc37 2022-10-23 stsp 
 268 13b2bc37 2022-10-23 stsp 	return NULL;
 269 13b2bc37 2022-10-23 stsp }
 270 13b2bc37 2022-10-23 stsp 
 271 13b2bc37 2022-10-23 stsp static const struct got_error *
 272 13b2bc37 2022-10-23 stsp ensure_client_is_not_reading(struct gotd_client *client)
 273 13b2bc37 2022-10-23 stsp {
 274 13b2bc37 2022-10-23 stsp 	if (client_is_reading(client)) {
 275 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 276 13b2bc37 2022-10-23 stsp 		    "uid %d made a write-request but is reading from "
 277 13b2bc37 2022-10-23 stsp 		    "a repository", client->euid);
 278 13b2bc37 2022-10-23 stsp 	}
 279 13b2bc37 2022-10-23 stsp 
 280 13b2bc37 2022-10-23 stsp 	return NULL;
 281 b50a2b46 2022-12-29 stsp }
 282 b50a2b46 2022-12-29 stsp 
 283 b50a2b46 2022-12-29 stsp static void
 284 839338f6 2023-06-22 op proc_done(struct gotd_child_proc *proc)
 285 b50a2b46 2022-12-29 stsp {
 286 839338f6 2023-06-22 op 	struct gotd_client *client;
 287 b50a2b46 2022-12-29 stsp 
 288 839338f6 2023-06-22 op 	TAILQ_REMOVE(&procs, proc, entry);
 289 b50a2b46 2022-12-29 stsp 
 290 839338f6 2023-06-22 op 	client = find_client_by_proc_fd(proc->iev.ibuf.fd);
 291 839338f6 2023-06-22 op 	if (client != NULL) {
 292 839338f6 2023-06-22 op 		if (proc == client->repo)
 293 839338f6 2023-06-22 op 			client->repo = NULL;
 294 839338f6 2023-06-22 op 		if (proc == client->auth)
 295 839338f6 2023-06-22 op 			client->auth = NULL;
 296 839338f6 2023-06-22 op 		if (proc == client->session)
 297 839338f6 2023-06-22 op 			client->session = NULL;
 298 839338f6 2023-06-22 op 		disconnect(client);
 299 839338f6 2023-06-22 op 	}
 300 ae7c1b78 2023-01-10 stsp 
 301 839338f6 2023-06-22 op 	evtimer_del(&proc->tmo);
 302 839338f6 2023-06-22 op 
 303 839338f6 2023-06-22 op 	if (proc->iev.ibuf.fd != -1) {
 304 839338f6 2023-06-22 op 		event_del(&proc->iev.ev);
 305 839338f6 2023-06-22 op 		msgbuf_clear(&proc->iev.ibuf.w);
 306 839338f6 2023-06-22 op 		close(proc->iev.ibuf.fd);
 307 839338f6 2023-06-22 op 	}
 308 839338f6 2023-06-22 op 
 309 ae7c1b78 2023-01-10 stsp 	free(proc);
 310 ba91039c 2023-06-22 op }
 311 ba91039c 2023-06-22 op 
 312 ba91039c 2023-06-22 op static void
 313 ba91039c 2023-06-22 op kill_repo_proc(struct gotd_client *client)
 314 ba91039c 2023-06-22 op {
 315 ba91039c 2023-06-22 op 	if (client->repo == NULL)
 316 ba91039c 2023-06-22 op 		return;
 317 ba91039c 2023-06-22 op 
 318 839338f6 2023-06-22 op 	kill_proc(client->repo, 0);
 319 ba91039c 2023-06-22 op 	client->repo = NULL;
 320 13b2bc37 2022-10-23 stsp }
 321 13b2bc37 2022-10-23 stsp 
 322 13b2bc37 2022-10-23 stsp static void
 323 5e25db14 2022-12-29 stsp kill_auth_proc(struct gotd_client *client)
 324 5e25db14 2022-12-29 stsp {
 325 5e25db14 2022-12-29 stsp 	if (client->auth == NULL)
 326 5e25db14 2022-12-29 stsp 		return;
 327 5e25db14 2022-12-29 stsp 
 328 839338f6 2023-06-22 op 	kill_proc(client->auth, 0);
 329 5e25db14 2022-12-29 stsp 	client->auth = NULL;
 330 5e25db14 2022-12-29 stsp }
 331 5e25db14 2022-12-29 stsp 
 332 5e25db14 2022-12-29 stsp static void
 333 ae7c1b78 2023-01-10 stsp kill_session_proc(struct gotd_client *client)
 334 ae7c1b78 2023-01-10 stsp {
 335 ae7c1b78 2023-01-10 stsp 	if (client->session == NULL)
 336 ae7c1b78 2023-01-10 stsp 		return;
 337 ae7c1b78 2023-01-10 stsp 
 338 839338f6 2023-06-22 op 	kill_proc(client->session, 0);
 339 ae7c1b78 2023-01-10 stsp 	client->session = NULL;
 340 ae7c1b78 2023-01-10 stsp }
 341 ae7c1b78 2023-01-10 stsp 
 342 ae7c1b78 2023-01-10 stsp static void
 343 13b2bc37 2022-10-23 stsp disconnect(struct gotd_client *client)
 344 13b2bc37 2022-10-23 stsp {
 345 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_disconnect idisconnect;
 346 c929736a 2023-06-22 op 	struct gotd_child_proc *listen_proc = gotd.listen_proc;
 347 13b2bc37 2022-10-23 stsp 	uint64_t slot;
 348 13b2bc37 2022-10-23 stsp 
 349 13b2bc37 2022-10-23 stsp 	log_debug("uid %d: disconnecting", client->euid);
 350 5e25db14 2022-12-29 stsp 
 351 5e25db14 2022-12-29 stsp 	kill_auth_proc(client);
 352 ae7c1b78 2023-01-10 stsp 	kill_session_proc(client);
 353 ba91039c 2023-06-22 op 	kill_repo_proc(client);
 354 d93ecf7d 2022-12-14 stsp 
 355 90270f79 2023-02-09 stsp 	idisconnect.client_id = client->id;
 356 d93ecf7d 2022-12-14 stsp 	if (gotd_imsg_compose_event(&listen_proc->iev,
 357 d93ecf7d 2022-12-14 stsp 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
 358 d93ecf7d 2022-12-14 stsp 	    &idisconnect, sizeof(idisconnect)) == -1)
 359 d93ecf7d 2022-12-14 stsp 		log_warn("imsg compose DISCONNECT");
 360 d93ecf7d 2022-12-14 stsp 
 361 13b2bc37 2022-10-23 stsp 	slot = client_hash(client->id) % nitems(gotd_clients);
 362 13b2bc37 2022-10-23 stsp 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
 363 13b2bc37 2022-10-23 stsp 	imsg_clear(&client->iev.ibuf);
 364 13b2bc37 2022-10-23 stsp 	event_del(&client->iev.ev);
 365 13b2bc37 2022-10-23 stsp 	evtimer_del(&client->tmo);
 366 ae7c1b78 2023-01-10 stsp 	if (client->fd != -1)
 367 ae7c1b78 2023-01-10 stsp 		close(client->fd);
 368 ae7c1b78 2023-01-10 stsp 	else if (client->iev.ibuf.fd != -1)
 369 ae7c1b78 2023-01-10 stsp 		close(client->iev.ibuf.fd);
 370 13b2bc37 2022-10-23 stsp 	free(client);
 371 13b2bc37 2022-10-23 stsp 	client_cnt--;
 372 13b2bc37 2022-10-23 stsp }
 373 13b2bc37 2022-10-23 stsp 
 374 13b2bc37 2022-10-23 stsp static void
 375 13b2bc37 2022-10-23 stsp disconnect_on_error(struct gotd_client *client, const struct got_error *err)
 376 13b2bc37 2022-10-23 stsp {
 377 13b2bc37 2022-10-23 stsp 	struct imsgbuf ibuf;
 378 13b2bc37 2022-10-23 stsp 
 379 13b2bc37 2022-10-23 stsp 	log_warnx("uid %d: %s", client->euid, err->msg);
 380 ae7c1b78 2023-01-10 stsp 	if (err->code != GOT_ERR_EOF && client->fd != -1) {
 381 13b2bc37 2022-10-23 stsp 		imsg_init(&ibuf, client->fd);
 382 13b2bc37 2022-10-23 stsp 		gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
 383 13b2bc37 2022-10-23 stsp 		imsg_clear(&ibuf);
 384 13b2bc37 2022-10-23 stsp 	}
 385 13b2bc37 2022-10-23 stsp 	disconnect(client);
 386 f1752522 2022-10-29 stsp }
 387 f1752522 2022-10-29 stsp 
 388 f1752522 2022-10-29 stsp static const struct got_error *
 389 f1752522 2022-10-29 stsp send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
 390 f1752522 2022-10-29 stsp {
 391 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 392 f1752522 2022-10-29 stsp 	struct gotd_imsg_info_repo irepo;
 393 f1752522 2022-10-29 stsp 
 394 f1752522 2022-10-29 stsp 	memset(&irepo, 0, sizeof(irepo));
 395 f1752522 2022-10-29 stsp 
 396 f1752522 2022-10-29 stsp 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
 397 f1752522 2022-10-29 stsp 	    >= sizeof(irepo.repo_name))
 398 f1752522 2022-10-29 stsp 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
 399 f1752522 2022-10-29 stsp 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
 400 f1752522 2022-10-29 stsp 	    >= sizeof(irepo.repo_path))
 401 f1752522 2022-10-29 stsp 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
 402 f1752522 2022-10-29 stsp 
 403 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
 404 f1752522 2022-10-29 stsp 	    &irepo, sizeof(irepo)) == -1) {
 405 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO_REPO");
 406 f1752522 2022-10-29 stsp 		if (err)
 407 f1752522 2022-10-29 stsp 			return err;
 408 f1752522 2022-10-29 stsp 	}
 409 f1752522 2022-10-29 stsp 
 410 f1752522 2022-10-29 stsp 	return NULL;
 411 f1752522 2022-10-29 stsp }
 412 f1752522 2022-10-29 stsp 
 413 f1752522 2022-10-29 stsp static const struct got_error *
 414 f1752522 2022-10-29 stsp send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
 415 f1752522 2022-10-29 stsp {
 416 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 417 f1752522 2022-10-29 stsp 	struct gotd_imsg_info_client iclient;
 418 f1752522 2022-10-29 stsp 	struct gotd_child_proc *proc;
 419 f1752522 2022-10-29 stsp 
 420 f1752522 2022-10-29 stsp 	memset(&iclient, 0, sizeof(iclient));
 421 f1752522 2022-10-29 stsp 	iclient.euid = client->euid;
 422 f1752522 2022-10-29 stsp 	iclient.egid = client->egid;
 423 f1752522 2022-10-29 stsp 
 424 f7a854cf 2023-01-10 stsp 	proc = client->repo;
 425 f1752522 2022-10-29 stsp 	if (proc) {
 426 eec68231 2022-12-14 stsp 		if (strlcpy(iclient.repo_name, proc->repo_path,
 427 f1752522 2022-10-29 stsp 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
 428 f1752522 2022-10-29 stsp 			return got_error_msg(GOT_ERR_NO_SPACE,
 429 f1752522 2022-10-29 stsp 			    "repo name too long");
 430 f1752522 2022-10-29 stsp 		}
 431 f1752522 2022-10-29 stsp 		if (client_is_writing(client))
 432 f1752522 2022-10-29 stsp 			iclient.is_writing = 1;
 433 ae7c1b78 2023-01-10 stsp 
 434 ae7c1b78 2023-01-10 stsp 		iclient.repo_child_pid = proc->pid;
 435 f1752522 2022-10-29 stsp 	}
 436 f1752522 2022-10-29 stsp 
 437 ae7c1b78 2023-01-10 stsp 	if (client->session)
 438 ae7c1b78 2023-01-10 stsp 		iclient.session_child_pid = client->session->pid;
 439 f1752522 2022-10-29 stsp 
 440 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
 441 f1752522 2022-10-29 stsp 	    &iclient, sizeof(iclient)) == -1) {
 442 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO_CLIENT");
 443 f1752522 2022-10-29 stsp 		if (err)
 444 f1752522 2022-10-29 stsp 			return err;
 445 f1752522 2022-10-29 stsp 	}
 446 f1752522 2022-10-29 stsp 
 447 f1752522 2022-10-29 stsp 	return NULL;
 448 f1752522 2022-10-29 stsp }
 449 f1752522 2022-10-29 stsp 
 450 f1752522 2022-10-29 stsp static const struct got_error *
 451 f1752522 2022-10-29 stsp send_info(struct gotd_client *client)
 452 f1752522 2022-10-29 stsp {
 453 f1752522 2022-10-29 stsp 	const struct got_error *err = NULL;
 454 f1752522 2022-10-29 stsp 	struct gotd_imsg_info info;
 455 f1752522 2022-10-29 stsp 	uint64_t slot;
 456 f1752522 2022-10-29 stsp 	struct gotd_repo *repo;
 457 f1752522 2022-10-29 stsp 
 458 78433331 2023-01-04 stsp 	if (client->euid != 0)
 459 78433331 2023-01-04 stsp 		return got_error_set_errno(EPERM, "info");
 460 78433331 2023-01-04 stsp 
 461 f1752522 2022-10-29 stsp 	info.pid = gotd.pid;
 462 f1752522 2022-10-29 stsp 	info.verbosity = gotd.verbosity;
 463 f1752522 2022-10-29 stsp 	info.nrepos = gotd.nrepos;
 464 f1752522 2022-10-29 stsp 	info.nclients = client_cnt - 1;
 465 f1752522 2022-10-29 stsp 
 466 f1752522 2022-10-29 stsp 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
 467 f1752522 2022-10-29 stsp 	    &info, sizeof(info)) == -1) {
 468 f1752522 2022-10-29 stsp 		err = got_error_from_errno("imsg compose INFO");
 469 f1752522 2022-10-29 stsp 		if (err)
 470 f1752522 2022-10-29 stsp 			return err;
 471 f1752522 2022-10-29 stsp 	}
 472 f1752522 2022-10-29 stsp 
 473 f1752522 2022-10-29 stsp 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
 474 f1752522 2022-10-29 stsp 		err = send_repo_info(&client->iev, repo);
 475 f1752522 2022-10-29 stsp 		if (err)
 476 f1752522 2022-10-29 stsp 			return err;
 477 f1752522 2022-10-29 stsp 	}
 478 f1752522 2022-10-29 stsp 
 479 f1752522 2022-10-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 480 f1752522 2022-10-29 stsp 		struct gotd_client *c;
 481 f1752522 2022-10-29 stsp 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
 482 f1752522 2022-10-29 stsp 			if (c->id == client->id)
 483 f1752522 2022-10-29 stsp 				continue;
 484 f1752522 2022-10-29 stsp 			err = send_client_info(&client->iev, c);
 485 f1752522 2022-10-29 stsp 			if (err)
 486 f1752522 2022-10-29 stsp 				return err;
 487 f1752522 2022-10-29 stsp 		}
 488 f1752522 2022-10-29 stsp 	}
 489 f1752522 2022-10-29 stsp 
 490 f1752522 2022-10-29 stsp 	return NULL;
 491 f1752522 2022-10-29 stsp }
 492 f1752522 2022-10-29 stsp 
 493 f1752522 2022-10-29 stsp static const struct got_error *
 494 f1752522 2022-10-29 stsp stop_gotd(struct gotd_client *client)
 495 f1752522 2022-10-29 stsp {
 496 f1752522 2022-10-29 stsp 
 497 f1752522 2022-10-29 stsp 	if (client->euid != 0)
 498 f1752522 2022-10-29 stsp 		return got_error_set_errno(EPERM, "stop");
 499 f1752522 2022-10-29 stsp 
 500 f1752522 2022-10-29 stsp 	gotd_shutdown();
 501 f1752522 2022-10-29 stsp 	/* NOTREACHED */
 502 0ccf3acb 2022-11-16 stsp 	return NULL;
 503 0ccf3acb 2022-11-16 stsp }
 504 0ccf3acb 2022-11-16 stsp 
 505 13b2bc37 2022-10-23 stsp static const struct got_error *
 506 ae7c1b78 2023-01-10 stsp start_client_authentication(struct gotd_client *client, struct imsg *imsg)
 507 13b2bc37 2022-10-23 stsp {
 508 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 509 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_list_refs ireq;
 510 0ccf3acb 2022-11-16 stsp 	struct gotd_repo *repo = NULL;
 511 13b2bc37 2022-10-23 stsp 	size_t datalen;
 512 13b2bc37 2022-10-23 stsp 
 513 13b2bc37 2022-10-23 stsp 	log_debug("list-refs request from uid %d", client->euid);
 514 13b2bc37 2022-10-23 stsp 
 515 eac23c30 2023-01-10 stsp 	if (client->state != GOTD_CLIENT_STATE_NEW)
 516 ae7c1b78 2023-01-10 stsp 		return got_error_msg(GOT_ERR_BAD_REQUEST,
 517 ae7c1b78 2023-01-10 stsp 		    "unexpected list-refs request received");
 518 ae7c1b78 2023-01-10 stsp 
 519 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 520 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(ireq))
 521 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 522 13b2bc37 2022-10-23 stsp 
 523 13b2bc37 2022-10-23 stsp 	memcpy(&ireq, imsg->data, datalen);
 524 13b2bc37 2022-10-23 stsp 
 525 13b2bc37 2022-10-23 stsp 	if (ireq.client_is_reading) {
 526 13b2bc37 2022-10-23 stsp 		err = ensure_client_is_not_writing(client);
 527 13b2bc37 2022-10-23 stsp 		if (err)
 528 13b2bc37 2022-10-23 stsp 			return err;
 529 b09c1279 2023-03-28 stsp 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
 530 0ccf3acb 2022-11-16 stsp 		if (repo == NULL)
 531 0ccf3acb 2022-11-16 stsp 			return got_error(GOT_ERR_NOT_GIT_REPO);
 532 5e25db14 2022-12-29 stsp 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
 533 b50a2b46 2022-12-29 stsp 		    gotd.argv0, gotd.confpath, gotd.daemonize,
 534 b50a2b46 2022-12-29 stsp 		    gotd.verbosity);
 535 b50a2b46 2022-12-29 stsp 		if (err)
 536 b50a2b46 2022-12-29 stsp 			return err;
 537 13b2bc37 2022-10-23 stsp 	} else {
 538 13b2bc37 2022-10-23 stsp 		err = ensure_client_is_not_reading(client);
 539 0ccf3acb 2022-11-16 stsp 		if (err)
 540 0ccf3acb 2022-11-16 stsp 			return err;
 541 b09c1279 2023-03-28 stsp 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
 542 0ccf3acb 2022-11-16 stsp 		if (repo == NULL)
 543 0ccf3acb 2022-11-16 stsp 			return got_error(GOT_ERR_NOT_GIT_REPO);
 544 5e25db14 2022-12-29 stsp 		err = start_auth_child(client,
 545 5e25db14 2022-12-29 stsp 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
 546 5e25db14 2022-12-29 stsp 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
 547 b50a2b46 2022-12-29 stsp 		    gotd.verbosity);
 548 b50a2b46 2022-12-29 stsp 		if (err)
 549 b50a2b46 2022-12-29 stsp 			return err;
 550 13b2bc37 2022-10-23 stsp 	}
 551 13b2bc37 2022-10-23 stsp 
 552 ae7c1b78 2023-01-10 stsp 	evtimer_add(&client->tmo, &auth_timeout);
 553 13b2bc37 2022-10-23 stsp 
 554 ae7c1b78 2023-01-10 stsp 	/* Flow continues upon authentication successs/failure or timeout. */
 555 13b2bc37 2022-10-23 stsp 	return NULL;
 556 13b2bc37 2022-10-23 stsp }
 557 13b2bc37 2022-10-23 stsp 
 558 13b2bc37 2022-10-23 stsp static void
 559 13b2bc37 2022-10-23 stsp gotd_request(int fd, short events, void *arg)
 560 13b2bc37 2022-10-23 stsp {
 561 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev *iev = arg;
 562 13b2bc37 2022-10-23 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
 563 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = iev->handler_arg;
 564 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 565 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 566 13b2bc37 2022-10-23 stsp 	ssize_t n;
 567 13b2bc37 2022-10-23 stsp 
 568 13b2bc37 2022-10-23 stsp 	if (events & EV_WRITE) {
 569 13b2bc37 2022-10-23 stsp 		while (ibuf->w.queued) {
 570 13b2bc37 2022-10-23 stsp 			n = msgbuf_write(&ibuf->w);
 571 13b2bc37 2022-10-23 stsp 			if (n == -1 && errno == EPIPE) {
 572 13b2bc37 2022-10-23 stsp 				/*
 573 13b2bc37 2022-10-23 stsp 				 * The client has closed its socket.
 574 13b2bc37 2022-10-23 stsp 				 * This can happen when Git clients are
 575 13b2bc37 2022-10-23 stsp 				 * done sending pack file data.
 576 77d0cae1 2022-12-30 op 				 */
 577 13b2bc37 2022-10-23 stsp 				msgbuf_clear(&ibuf->w);
 578 13b2bc37 2022-10-23 stsp 				continue;
 579 13b2bc37 2022-10-23 stsp 			} else if (n == -1 && errno != EAGAIN) {
 580 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("imsg_flush");
 581 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
 582 13b2bc37 2022-10-23 stsp 				return;
 583 13b2bc37 2022-10-23 stsp 			}
 584 13b2bc37 2022-10-23 stsp 			if (n == 0) {
 585 13b2bc37 2022-10-23 stsp 				/* Connection closed. */
 586 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_EOF);
 587 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
 588 13b2bc37 2022-10-23 stsp 				return;
 589 13b2bc37 2022-10-23 stsp 			}
 590 13b2bc37 2022-10-23 stsp 		}
 591 f1752522 2022-10-29 stsp 
 592 f1752522 2022-10-29 stsp 		/* Disconnect gotctl(8) now that messages have been sent. */
 593 f1752522 2022-10-29 stsp 		if (!client_is_reading(client) && !client_is_writing(client)) {
 594 f1752522 2022-10-29 stsp 			disconnect(client);
 595 f1752522 2022-10-29 stsp 			return;
 596 f1752522 2022-10-29 stsp 		}
 597 13b2bc37 2022-10-23 stsp 	}
 598 13b2bc37 2022-10-23 stsp 
 599 13b2bc37 2022-10-23 stsp 	if ((events & EV_READ) == 0)
 600 13b2bc37 2022-10-23 stsp 		return;
 601 13b2bc37 2022-10-23 stsp 
 602 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 603 13b2bc37 2022-10-23 stsp 
 604 13b2bc37 2022-10-23 stsp 	while (err == NULL) {
 605 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_recv(&imsg, ibuf, 0);
 606 13b2bc37 2022-10-23 stsp 		if (err) {
 607 13b2bc37 2022-10-23 stsp 			if (err->code == GOT_ERR_PRIVSEP_READ)
 608 13b2bc37 2022-10-23 stsp 				err = NULL;
 609 13b2bc37 2022-10-23 stsp 			break;
 610 13b2bc37 2022-10-23 stsp 		}
 611 13b2bc37 2022-10-23 stsp 
 612 13b2bc37 2022-10-23 stsp 		evtimer_del(&client->tmo);
 613 13b2bc37 2022-10-23 stsp 
 614 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 615 f1752522 2022-10-29 stsp 		case GOTD_IMSG_INFO:
 616 f1752522 2022-10-29 stsp 			err = send_info(client);
 617 f1752522 2022-10-29 stsp 			break;
 618 f1752522 2022-10-29 stsp 		case GOTD_IMSG_STOP:
 619 f1752522 2022-10-29 stsp 			err = stop_gotd(client);
 620 f1752522 2022-10-29 stsp 			break;
 621 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_LIST_REFS:
 622 ae7c1b78 2023-01-10 stsp 			err = start_client_authentication(client, &imsg);
 623 13b2bc37 2022-10-23 stsp 			break;
 624 13b2bc37 2022-10-23 stsp 		default:
 625 ae7c1b78 2023-01-10 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
 626 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 627 13b2bc37 2022-10-23 stsp 			break;
 628 13b2bc37 2022-10-23 stsp 		}
 629 13b2bc37 2022-10-23 stsp 
 630 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 631 13b2bc37 2022-10-23 stsp 	}
 632 13b2bc37 2022-10-23 stsp 
 633 13b2bc37 2022-10-23 stsp 	if (err) {
 634 b5225f29 2023-01-22 op 		disconnect_on_error(client, err);
 635 13b2bc37 2022-10-23 stsp 	} else {
 636 13b2bc37 2022-10-23 stsp 		gotd_imsg_event_add(&client->iev);
 637 13b2bc37 2022-10-23 stsp 	}
 638 13b2bc37 2022-10-23 stsp }
 639 13b2bc37 2022-10-23 stsp 
 640 13b2bc37 2022-10-23 stsp static void
 641 ae7c1b78 2023-01-10 stsp gotd_auth_timeout(int fd, short events, void *arg)
 642 13b2bc37 2022-10-23 stsp {
 643 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = arg;
 644 13b2bc37 2022-10-23 stsp 
 645 ae7c1b78 2023-01-10 stsp 	log_debug("disconnecting uid %d due to authentication timeout",
 646 ae7c1b78 2023-01-10 stsp 	    client->euid);
 647 13b2bc37 2022-10-23 stsp 	disconnect(client);
 648 13b2bc37 2022-10-23 stsp }
 649 13b2bc37 2022-10-23 stsp 
 650 d93ecf7d 2022-12-14 stsp static const struct got_error *
 651 d93ecf7d 2022-12-14 stsp recv_connect(uint32_t *client_id, struct imsg *imsg)
 652 13b2bc37 2022-10-23 stsp {
 653 d93ecf7d 2022-12-14 stsp 	const struct got_error *err = NULL;
 654 d93ecf7d 2022-12-14 stsp 	struct gotd_imsg_connect iconnect;
 655 d93ecf7d 2022-12-14 stsp 	size_t datalen;
 656 13b2bc37 2022-10-23 stsp 	int s = -1;
 657 13b2bc37 2022-10-23 stsp 	struct gotd_client *client = NULL;
 658 13b2bc37 2022-10-23 stsp 
 659 d93ecf7d 2022-12-14 stsp 	*client_id = 0;
 660 13b2bc37 2022-10-23 stsp 
 661 d93ecf7d 2022-12-14 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 662 d93ecf7d 2022-12-14 stsp 	if (datalen != sizeof(iconnect))
 663 d93ecf7d 2022-12-14 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 664 d93ecf7d 2022-12-14 stsp 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
 665 13b2bc37 2022-10-23 stsp 
 666 d93ecf7d 2022-12-14 stsp 	s = imsg->fd;
 667 13b2bc37 2022-10-23 stsp 	if (s == -1) {
 668 d93ecf7d 2022-12-14 stsp 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
 669 d93ecf7d 2022-12-14 stsp 		goto done;
 670 13b2bc37 2022-10-23 stsp 	}
 671 13b2bc37 2022-10-23 stsp 
 672 d93ecf7d 2022-12-14 stsp 	if (find_client(iconnect.client_id)) {
 673 d93ecf7d 2022-12-14 stsp 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
 674 d93ecf7d 2022-12-14 stsp 		goto done;
 675 d93ecf7d 2022-12-14 stsp 	}
 676 13b2bc37 2022-10-23 stsp 
 677 13b2bc37 2022-10-23 stsp 	client = calloc(1, sizeof(*client));
 678 13b2bc37 2022-10-23 stsp 	if (client == NULL) {
 679 d93ecf7d 2022-12-14 stsp 		err = got_error_from_errno("calloc");
 680 d93ecf7d 2022-12-14 stsp 		goto done;
 681 13b2bc37 2022-10-23 stsp 	}
 682 13b2bc37 2022-10-23 stsp 
 683 d93ecf7d 2022-12-14 stsp 	*client_id = iconnect.client_id;
 684 d93ecf7d 2022-12-14 stsp 
 685 eac23c30 2023-01-10 stsp 	client->state = GOTD_CLIENT_STATE_NEW;
 686 d93ecf7d 2022-12-14 stsp 	client->id = iconnect.client_id;
 687 13b2bc37 2022-10-23 stsp 	client->fd = s;
 688 13b2bc37 2022-10-23 stsp 	s = -1;
 689 365cf0f3 2022-12-29 stsp 	/* The auth process will verify UID/GID for us. */
 690 365cf0f3 2022-12-29 stsp 	client->euid = iconnect.euid;
 691 365cf0f3 2022-12-29 stsp 	client->egid = iconnect.egid;
 692 13b2bc37 2022-10-23 stsp 
 693 13b2bc37 2022-10-23 stsp 	imsg_init(&client->iev.ibuf, client->fd);
 694 13b2bc37 2022-10-23 stsp 	client->iev.handler = gotd_request;
 695 13b2bc37 2022-10-23 stsp 	client->iev.events = EV_READ;
 696 13b2bc37 2022-10-23 stsp 	client->iev.handler_arg = client;
 697 13b2bc37 2022-10-23 stsp 
 698 13b2bc37 2022-10-23 stsp 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
 699 13b2bc37 2022-10-23 stsp 	    &client->iev);
 700 13b2bc37 2022-10-23 stsp 	gotd_imsg_event_add(&client->iev);
 701 13b2bc37 2022-10-23 stsp 
 702 ae7c1b78 2023-01-10 stsp 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
 703 13b2bc37 2022-10-23 stsp 
 704 13b2bc37 2022-10-23 stsp 	add_client(client);
 705 13b2bc37 2022-10-23 stsp 	log_debug("%s: new client uid %d connected on fd %d", __func__,
 706 13b2bc37 2022-10-23 stsp 	    client->euid, client->fd);
 707 d93ecf7d 2022-12-14 stsp done:
 708 d93ecf7d 2022-12-14 stsp 	if (err) {
 709 c929736a 2023-06-22 op 		struct gotd_child_proc *listen_proc = gotd.listen_proc;
 710 d93ecf7d 2022-12-14 stsp 		struct gotd_imsg_disconnect idisconnect;
 711 13b2bc37 2022-10-23 stsp 
 712 d93ecf7d 2022-12-14 stsp 		idisconnect.client_id = client->id;
 713 d93ecf7d 2022-12-14 stsp 		if (gotd_imsg_compose_event(&listen_proc->iev,
 714 d93ecf7d 2022-12-14 stsp 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
 715 d93ecf7d 2022-12-14 stsp 		    &idisconnect, sizeof(idisconnect)) == -1)
 716 d93ecf7d 2022-12-14 stsp 			log_warn("imsg compose DISCONNECT");
 717 d93ecf7d 2022-12-14 stsp 
 718 d93ecf7d 2022-12-14 stsp 		if (s != -1)
 719 d93ecf7d 2022-12-14 stsp 			close(s);
 720 d93ecf7d 2022-12-14 stsp 	}
 721 d93ecf7d 2022-12-14 stsp 
 722 d93ecf7d 2022-12-14 stsp 	return err;
 723 13b2bc37 2022-10-23 stsp }
 724 13b2bc37 2022-10-23 stsp 
 725 13b2bc37 2022-10-23 stsp static const char *gotd_proc_names[PROC_MAX] = {
 726 13b2bc37 2022-10-23 stsp 	"parent",
 727 d93ecf7d 2022-12-14 stsp 	"listen",
 728 5e25db14 2022-12-29 stsp 	"auth",
 729 ce986f22 2023-06-19 stsp 	"session_read",
 730 ce986f22 2023-06-19 stsp 	"session_write",
 731 13b2bc37 2022-10-23 stsp 	"repo_read",
 732 4b3827cd 2023-07-08 stsp 	"repo_write",
 733 4b3827cd 2023-07-08 stsp 	"gitwrapper"
 734 13b2bc37 2022-10-23 stsp };
 735 13b2bc37 2022-10-23 stsp 
 736 13b2bc37 2022-10-23 stsp static void
 737 13b2bc37 2022-10-23 stsp kill_proc(struct gotd_child_proc *proc, int fatal)
 738 13b2bc37 2022-10-23 stsp {
 739 839338f6 2023-06-22 op 	struct timeval tv = { 5, 0 };
 740 839338f6 2023-06-22 op 
 741 839338f6 2023-06-22 op 	log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
 742 839338f6 2023-06-22 op 
 743 839338f6 2023-06-22 op 	if (proc->iev.ibuf.fd != -1) {
 744 839338f6 2023-06-22 op 		event_del(&proc->iev.ev);
 745 839338f6 2023-06-22 op 		msgbuf_clear(&proc->iev.ibuf.w);
 746 839338f6 2023-06-22 op 		close(proc->iev.ibuf.fd);
 747 839338f6 2023-06-22 op 		proc->iev.ibuf.fd = -1;
 748 839338f6 2023-06-22 op 	}
 749 839338f6 2023-06-22 op 
 750 839338f6 2023-06-22 op 	if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
 751 839338f6 2023-06-22 op 		evtimer_add(&proc->tmo, &tv);
 752 839338f6 2023-06-22 op 
 753 13b2bc37 2022-10-23 stsp 	if (fatal) {
 754 13b2bc37 2022-10-23 stsp 		log_warnx("sending SIGKILL to PID %d", proc->pid);
 755 13b2bc37 2022-10-23 stsp 		kill(proc->pid, SIGKILL);
 756 13b2bc37 2022-10-23 stsp 	} else
 757 13b2bc37 2022-10-23 stsp 		kill(proc->pid, SIGTERM);
 758 13b2bc37 2022-10-23 stsp }
 759 13b2bc37 2022-10-23 stsp 
 760 13b2bc37 2022-10-23 stsp static void
 761 839338f6 2023-06-22 op kill_proc_timeout(int fd, short ev, void *d)
 762 839338f6 2023-06-22 op {
 763 839338f6 2023-06-22 op 	struct gotd_child_proc *proc = d;
 764 839338f6 2023-06-22 op 
 765 839338f6 2023-06-22 op 	log_warnx("timeout waiting for PID %d to terminate;"
 766 839338f6 2023-06-22 op 	    " retrying with force", proc->pid);
 767 839338f6 2023-06-22 op 	kill_proc(proc, 1);
 768 839338f6 2023-06-22 op }
 769 839338f6 2023-06-22 op 
 770 839338f6 2023-06-22 op static void
 771 13b2bc37 2022-10-23 stsp gotd_shutdown(void)
 772 13b2bc37 2022-10-23 stsp {
 773 b50a2b46 2022-12-29 stsp 	uint64_t slot;
 774 13b2bc37 2022-10-23 stsp 
 775 ae7c1b78 2023-01-10 stsp 	log_debug("shutting down");
 776 b50a2b46 2022-12-29 stsp 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
 777 b50a2b46 2022-12-29 stsp 		struct gotd_client *c, *tmp;
 778 b50a2b46 2022-12-29 stsp 
 779 b50a2b46 2022-12-29 stsp 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
 780 b50a2b46 2022-12-29 stsp 			disconnect(c);
 781 13b2bc37 2022-10-23 stsp 	}
 782 13b2bc37 2022-10-23 stsp 
 783 839338f6 2023-06-22 op 	kill_proc(gotd.listen_proc, 0);
 784 13b2bc37 2022-10-23 stsp 
 785 13b2bc37 2022-10-23 stsp 	log_info("terminating");
 786 13b2bc37 2022-10-23 stsp 	exit(0);
 787 13b2bc37 2022-10-23 stsp }
 788 13b2bc37 2022-10-23 stsp 
 789 839338f6 2023-06-22 op static struct gotd_child_proc *
 790 839338f6 2023-06-22 op find_proc_by_pid(pid_t pid)
 791 839338f6 2023-06-22 op {
 792 839338f6 2023-06-22 op 	struct gotd_child_proc *proc = NULL;
 793 839338f6 2023-06-22 op 
 794 839338f6 2023-06-22 op 	TAILQ_FOREACH(proc, &procs, entry)
 795 839338f6 2023-06-22 op 		if (proc->pid == pid)
 796 839338f6 2023-06-22 op 			break;
 797 839338f6 2023-06-22 op 
 798 839338f6 2023-06-22 op 	return proc;
 799 839338f6 2023-06-22 op }
 800 839338f6 2023-06-22 op 
 801 13b2bc37 2022-10-23 stsp void
 802 13b2bc37 2022-10-23 stsp gotd_sighdlr(int sig, short event, void *arg)
 803 13b2bc37 2022-10-23 stsp {
 804 839338f6 2023-06-22 op 	struct gotd_child_proc *proc;
 805 839338f6 2023-06-22 op 	pid_t pid;
 806 839338f6 2023-06-22 op 	int status;
 807 839338f6 2023-06-22 op 
 808 13b2bc37 2022-10-23 stsp 	/*
 809 13b2bc37 2022-10-23 stsp 	 * Normal signal handler rules don't apply because libevent
 810 13b2bc37 2022-10-23 stsp 	 * decouples for us.
 811 13b2bc37 2022-10-23 stsp 	 */
 812 13b2bc37 2022-10-23 stsp 
 813 13b2bc37 2022-10-23 stsp 	switch (sig) {
 814 13b2bc37 2022-10-23 stsp 	case SIGHUP:
 815 13b2bc37 2022-10-23 stsp 		log_info("%s: ignoring SIGHUP", __func__);
 816 13b2bc37 2022-10-23 stsp 		break;
 817 13b2bc37 2022-10-23 stsp 	case SIGUSR1:
 818 13b2bc37 2022-10-23 stsp 		log_info("%s: ignoring SIGUSR1", __func__);
 819 13b2bc37 2022-10-23 stsp 		break;
 820 13b2bc37 2022-10-23 stsp 	case SIGTERM:
 821 13b2bc37 2022-10-23 stsp 	case SIGINT:
 822 13b2bc37 2022-10-23 stsp 		gotd_shutdown();
 823 13b2bc37 2022-10-23 stsp 		break;
 824 839338f6 2023-06-22 op 	case SIGCHLD:
 825 839338f6 2023-06-22 op 		for (;;) {
 826 839338f6 2023-06-22 op 			pid = waitpid(WAIT_ANY, &status, WNOHANG);
 827 839338f6 2023-06-22 op 			if (pid == -1) {
 828 839338f6 2023-06-22 op 				if (errno == EINTR)
 829 839338f6 2023-06-22 op 					continue;
 830 839338f6 2023-06-22 op 				if (errno == ECHILD)
 831 839338f6 2023-06-22 op 					break;
 832 839338f6 2023-06-22 op 				fatal("waitpid");
 833 839338f6 2023-06-22 op 			}
 834 839338f6 2023-06-22 op 			if (pid == 0)
 835 839338f6 2023-06-22 op 				break;
 836 839338f6 2023-06-22 op 
 837 839338f6 2023-06-22 op 			log_debug("reaped pid %d", pid);
 838 839338f6 2023-06-22 op 			proc = find_proc_by_pid(pid);
 839 839338f6 2023-06-22 op 			if (proc == NULL) {
 840 839338f6 2023-06-22 op 				log_info("caught exit of unknown child %d",
 841 839338f6 2023-06-22 op 				    pid);
 842 839338f6 2023-06-22 op 				continue;
 843 839338f6 2023-06-22 op 			}
 844 839338f6 2023-06-22 op 
 845 839338f6 2023-06-22 op 			if (WIFSIGNALED(status)) {
 846 839338f6 2023-06-22 op 				log_warnx("child PID %d terminated with"
 847 839338f6 2023-06-22 op 				    " signal %d", pid, WTERMSIG(status));
 848 839338f6 2023-06-22 op 			}
 849 839338f6 2023-06-22 op 
 850 839338f6 2023-06-22 op 			proc_done(proc);
 851 839338f6 2023-06-22 op 		}
 852 839338f6 2023-06-22 op 		break;
 853 13b2bc37 2022-10-23 stsp 	default:
 854 13b2bc37 2022-10-23 stsp 		fatalx("unexpected signal");
 855 13b2bc37 2022-10-23 stsp 	}
 856 13b2bc37 2022-10-23 stsp }
 857 13b2bc37 2022-10-23 stsp 
 858 13b2bc37 2022-10-23 stsp static const struct got_error *
 859 13b2bc37 2022-10-23 stsp ensure_proc_is_reading(struct gotd_client *client,
 860 13b2bc37 2022-10-23 stsp     struct gotd_child_proc *proc)
 861 13b2bc37 2022-10-23 stsp {
 862 13b2bc37 2022-10-23 stsp 	if (!client_is_reading(client)) {
 863 13b2bc37 2022-10-23 stsp 		kill_proc(proc, 1);
 864 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 865 13b2bc37 2022-10-23 stsp 		    "PID %d handled a read-request for uid %d but this "
 866 13b2bc37 2022-10-23 stsp 		    "user is not reading from a repository", proc->pid,
 867 13b2bc37 2022-10-23 stsp 		    client->euid);
 868 13b2bc37 2022-10-23 stsp 	}
 869 13b2bc37 2022-10-23 stsp 
 870 13b2bc37 2022-10-23 stsp 	return NULL;
 871 13b2bc37 2022-10-23 stsp }
 872 13b2bc37 2022-10-23 stsp 
 873 13b2bc37 2022-10-23 stsp static const struct got_error *
 874 13b2bc37 2022-10-23 stsp ensure_proc_is_writing(struct gotd_client *client,
 875 13b2bc37 2022-10-23 stsp     struct gotd_child_proc *proc)
 876 13b2bc37 2022-10-23 stsp {
 877 13b2bc37 2022-10-23 stsp 	if (!client_is_writing(client)) {
 878 13b2bc37 2022-10-23 stsp 		kill_proc(proc, 1);
 879 13b2bc37 2022-10-23 stsp 		return got_error_fmt(GOT_ERR_BAD_PACKET,
 880 13b2bc37 2022-10-23 stsp 		    "PID %d handled a write-request for uid %d but this "
 881 13b2bc37 2022-10-23 stsp 		    "user is not writing to a repository", proc->pid,
 882 13b2bc37 2022-10-23 stsp 		    client->euid);
 883 13b2bc37 2022-10-23 stsp 	}
 884 13b2bc37 2022-10-23 stsp 
 885 13b2bc37 2022-10-23 stsp 	return NULL;
 886 13b2bc37 2022-10-23 stsp }
 887 13b2bc37 2022-10-23 stsp 
 888 13b2bc37 2022-10-23 stsp static int
 889 13b2bc37 2022-10-23 stsp verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
 890 13b2bc37 2022-10-23 stsp     struct imsg *imsg)
 891 13b2bc37 2022-10-23 stsp {
 892 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 893 13b2bc37 2022-10-23 stsp 	int ret = 0;
 894 13b2bc37 2022-10-23 stsp 
 895 d93ecf7d 2022-12-14 stsp 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
 896 f7a854cf 2023-01-10 stsp 		if (client->repo == NULL)
 897 d93ecf7d 2022-12-14 stsp 			fatalx("no process found for uid %d", client->euid);
 898 f7a854cf 2023-01-10 stsp 		if (proc->pid != client->repo->pid) {
 899 d93ecf7d 2022-12-14 stsp 			kill_proc(proc, 1);
 900 d93ecf7d 2022-12-14 stsp 			log_warnx("received message from PID %d for uid %d, "
 901 d93ecf7d 2022-12-14 stsp 			    "while PID %d is the process serving this user",
 902 f7a854cf 2023-01-10 stsp 			    proc->pid, client->euid, client->repo->pid);
 903 ae7c1b78 2023-01-10 stsp 			return 0;
 904 ae7c1b78 2023-01-10 stsp 		}
 905 ae7c1b78 2023-01-10 stsp 	}
 906 b0614828 2023-06-19 stsp 	if (proc->type == PROC_SESSION_READ ||
 907 b0614828 2023-06-19 stsp 	    proc->type == PROC_SESSION_WRITE) {
 908 ae7c1b78 2023-01-10 stsp 		if (client->session == NULL) {
 909 ae7c1b78 2023-01-10 stsp 			log_warnx("no session found for uid %d", client->euid);
 910 d93ecf7d 2022-12-14 stsp 			return 0;
 911 d93ecf7d 2022-12-14 stsp 		}
 912 ae7c1b78 2023-01-10 stsp 		if (proc->pid != client->session->pid) {
 913 ae7c1b78 2023-01-10 stsp 			kill_proc(proc, 1);
 914 ae7c1b78 2023-01-10 stsp 			log_warnx("received message from PID %d for uid %d, "
 915 ae7c1b78 2023-01-10 stsp 			    "while PID %d is the process serving this user",
 916 ae7c1b78 2023-01-10 stsp 			    proc->pid, client->euid, client->session->pid);
 917 ae7c1b78 2023-01-10 stsp 			return 0;
 918 ae7c1b78 2023-01-10 stsp 		}
 919 13b2bc37 2022-10-23 stsp 	}
 920 13b2bc37 2022-10-23 stsp 
 921 13b2bc37 2022-10-23 stsp 	switch (imsg->hdr.type) {
 922 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_ERROR:
 923 13b2bc37 2022-10-23 stsp 		ret = 1;
 924 13b2bc37 2022-10-23 stsp 		break;
 925 d93ecf7d 2022-12-14 stsp 	case GOTD_IMSG_CONNECT:
 926 d93ecf7d 2022-12-14 stsp 		if (proc->type != PROC_LISTEN) {
 927 d93ecf7d 2022-12-14 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 928 d93ecf7d 2022-12-14 stsp 			    "new connection for uid %d from PID %d "
 929 d93ecf7d 2022-12-14 stsp 			    "which is not the listen process",
 930 5e25db14 2022-12-29 stsp 			    proc->pid, client->euid);
 931 5e25db14 2022-12-29 stsp 		} else
 932 5e25db14 2022-12-29 stsp 			ret = 1;
 933 5e25db14 2022-12-29 stsp 		break;
 934 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ACCESS_GRANTED:
 935 5e25db14 2022-12-29 stsp 		if (proc->type != PROC_AUTH) {
 936 5e25db14 2022-12-29 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 937 5e25db14 2022-12-29 stsp 			    "authentication of uid %d from PID %d "
 938 5e25db14 2022-12-29 stsp 			    "which is not the auth process",
 939 d93ecf7d 2022-12-14 stsp 			    proc->pid, client->euid);
 940 d93ecf7d 2022-12-14 stsp 		} else
 941 d93ecf7d 2022-12-14 stsp 			ret = 1;
 942 d93ecf7d 2022-12-14 stsp 		break;
 943 ae7c1b78 2023-01-10 stsp 	case GOTD_IMSG_CLIENT_SESSION_READY:
 944 b0614828 2023-06-19 stsp 		if (proc->type != PROC_SESSION_READ &&
 945 b0614828 2023-06-19 stsp 		    proc->type != PROC_SESSION_WRITE) {
 946 ae7c1b78 2023-01-10 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 947 ae7c1b78 2023-01-10 stsp 			    "unexpected \"ready\" signal from PID %d",
 948 ae7c1b78 2023-01-10 stsp 			    proc->pid);
 949 ae7c1b78 2023-01-10 stsp 		} else
 950 ae7c1b78 2023-01-10 stsp 			ret = 1;
 951 ae7c1b78 2023-01-10 stsp 		break;
 952 b50a2b46 2022-12-29 stsp 	case GOTD_IMSG_REPO_CHILD_READY:
 953 b50a2b46 2022-12-29 stsp 		if (proc->type != PROC_REPO_READ &&
 954 b50a2b46 2022-12-29 stsp 		    proc->type != PROC_REPO_WRITE) {
 955 b50a2b46 2022-12-29 stsp 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
 956 b50a2b46 2022-12-29 stsp 			    "unexpected \"ready\" signal from PID %d",
 957 b50a2b46 2022-12-29 stsp 			    proc->pid);
 958 b50a2b46 2022-12-29 stsp 		} else
 959 b50a2b46 2022-12-29 stsp 			ret = 1;
 960 b50a2b46 2022-12-29 stsp 		break;
 961 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_PACKFILE_DONE:
 962 13b2bc37 2022-10-23 stsp 		err = ensure_proc_is_reading(client, proc);
 963 13b2bc37 2022-10-23 stsp 		if (err)
 964 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
 965 13b2bc37 2022-10-23 stsp 		else
 966 13b2bc37 2022-10-23 stsp 			ret = 1;
 967 13b2bc37 2022-10-23 stsp 		break;
 968 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_PACKFILE_INSTALL:
 969 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_REF_UPDATES_START:
 970 13b2bc37 2022-10-23 stsp 	case GOTD_IMSG_REF_UPDATE:
 971 13b2bc37 2022-10-23 stsp 		err = ensure_proc_is_writing(client, proc);
 972 13b2bc37 2022-10-23 stsp 		if (err)
 973 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
 974 13b2bc37 2022-10-23 stsp 		else
 975 13b2bc37 2022-10-23 stsp 			ret = 1;
 976 13b2bc37 2022-10-23 stsp 		break;
 977 13b2bc37 2022-10-23 stsp 	default:
 978 13b2bc37 2022-10-23 stsp 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
 979 13b2bc37 2022-10-23 stsp 		break;
 980 13b2bc37 2022-10-23 stsp 	}
 981 13b2bc37 2022-10-23 stsp 
 982 13b2bc37 2022-10-23 stsp 	return ret;
 983 13b2bc37 2022-10-23 stsp }
 984 13b2bc37 2022-10-23 stsp 
 985 13b2bc37 2022-10-23 stsp static const struct got_error *
 986 ae7c1b78 2023-01-10 stsp connect_repo_child(struct gotd_client *client,
 987 ae7c1b78 2023-01-10 stsp     struct gotd_child_proc *repo_proc)
 988 b50a2b46 2022-12-29 stsp {
 989 b50a2b46 2022-12-29 stsp 	static const struct got_error *err;
 990 ae7c1b78 2023-01-10 stsp 	struct gotd_imsgev *session_iev = &client->session->iev;
 991 ae7c1b78 2023-01-10 stsp 	struct gotd_imsg_connect_repo_child ireq;
 992 ae7c1b78 2023-01-10 stsp 	int pipe[2];
 993 b50a2b46 2022-12-29 stsp 
 994 eac23c30 2023-01-10 stsp 	if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
 995 ae7c1b78 2023-01-10 stsp 		return got_error_msg(GOT_ERR_BAD_REQUEST,
 996 ae7c1b78 2023-01-10 stsp 		    "unexpected repo child ready signal received");
 997 b50a2b46 2022-12-29 stsp 
 998 ae7c1b78 2023-01-10 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
 999 ae7c1b78 2023-01-10 stsp 	    PF_UNSPEC, pipe) == -1)
1000 ae7c1b78 2023-01-10 stsp 		fatal("socketpair");
1001 b50a2b46 2022-12-29 stsp 
1002 ae7c1b78 2023-01-10 stsp 	memset(&ireq, 0, sizeof(ireq));
1003 ae7c1b78 2023-01-10 stsp 	ireq.client_id = client->id;
1004 ae7c1b78 2023-01-10 stsp 	ireq.proc_id = repo_proc->type;
1005 13b2bc37 2022-10-23 stsp 
1006 ae7c1b78 2023-01-10 stsp 	/* Pass repo child pipe to session child process. */
1007 ae7c1b78 2023-01-10 stsp 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1008 ae7c1b78 2023-01-10 stsp 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1009 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1010 ae7c1b78 2023-01-10 stsp 		close(pipe[0]);
1011 ae7c1b78 2023-01-10 stsp 		close(pipe[1]);
1012 ae7c1b78 2023-01-10 stsp 		return err;
1013 13b2bc37 2022-10-23 stsp 	}
1014 13b2bc37 2022-10-23 stsp 
1015 ae7c1b78 2023-01-10 stsp 	/* Pass session child pipe to repo child process. */
1016 ae7c1b78 2023-01-10 stsp 	if (gotd_imsg_compose_event(&repo_proc->iev,
1017 ae7c1b78 2023-01-10 stsp 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1018 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1019 ae7c1b78 2023-01-10 stsp 		close(pipe[1]);
1020 ae7c1b78 2023-01-10 stsp 		return err;
1021 13b2bc37 2022-10-23 stsp 	}
1022 13b2bc37 2022-10-23 stsp 
1023 13b2bc37 2022-10-23 stsp 	return NULL;
1024 13b2bc37 2022-10-23 stsp }
1025 13b2bc37 2022-10-23 stsp 
1026 13b2bc37 2022-10-23 stsp static void
1027 b50a2b46 2022-12-29 stsp gotd_dispatch_listener(int fd, short event, void *arg)
1028 13b2bc37 2022-10-23 stsp {
1029 13b2bc37 2022-10-23 stsp 	struct gotd_imsgev *iev = arg;
1030 13b2bc37 2022-10-23 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1031 c929736a 2023-06-22 op 	struct gotd_child_proc *proc = gotd.listen_proc;
1032 b50a2b46 2022-12-29 stsp 	ssize_t n;
1033 b50a2b46 2022-12-29 stsp 	int shut = 0;
1034 b50a2b46 2022-12-29 stsp 	struct imsg imsg;
1035 b50a2b46 2022-12-29 stsp 
1036 b50a2b46 2022-12-29 stsp 	if (proc->iev.ibuf.fd != fd)
1037 b50a2b46 2022-12-29 stsp 		fatalx("%s: unexpected fd %d", __func__, fd);
1038 b50a2b46 2022-12-29 stsp 
1039 b50a2b46 2022-12-29 stsp 	if (event & EV_READ) {
1040 b50a2b46 2022-12-29 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1041 b50a2b46 2022-12-29 stsp 			fatal("imsg_read error");
1042 b50a2b46 2022-12-29 stsp 		if (n == 0) {
1043 b50a2b46 2022-12-29 stsp 			/* Connection closed. */
1044 b50a2b46 2022-12-29 stsp 			shut = 1;
1045 b50a2b46 2022-12-29 stsp 			goto done;
1046 b50a2b46 2022-12-29 stsp 		}
1047 b50a2b46 2022-12-29 stsp 	}
1048 b50a2b46 2022-12-29 stsp 
1049 b50a2b46 2022-12-29 stsp 	if (event & EV_WRITE) {
1050 b50a2b46 2022-12-29 stsp 		n = msgbuf_write(&ibuf->w);
1051 b50a2b46 2022-12-29 stsp 		if (n == -1 && errno != EAGAIN)
1052 b50a2b46 2022-12-29 stsp 			fatal("msgbuf_write");
1053 b50a2b46 2022-12-29 stsp 		if (n == 0) {
1054 b50a2b46 2022-12-29 stsp 			/* Connection closed. */
1055 b50a2b46 2022-12-29 stsp 			shut = 1;
1056 b50a2b46 2022-12-29 stsp 			goto done;
1057 b50a2b46 2022-12-29 stsp 		}
1058 b50a2b46 2022-12-29 stsp 	}
1059 b50a2b46 2022-12-29 stsp 
1060 b50a2b46 2022-12-29 stsp 	for (;;) {
1061 b50a2b46 2022-12-29 stsp 		const struct got_error *err = NULL;
1062 b50a2b46 2022-12-29 stsp 		struct gotd_client *client = NULL;
1063 b50a2b46 2022-12-29 stsp 		uint32_t client_id = 0;
1064 b50a2b46 2022-12-29 stsp 		int do_disconnect = 0;
1065 b50a2b46 2022-12-29 stsp 
1066 b50a2b46 2022-12-29 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1067 b50a2b46 2022-12-29 stsp 			fatal("%s: imsg_get error", __func__);
1068 b50a2b46 2022-12-29 stsp 		if (n == 0)	/* No more messages. */
1069 b50a2b46 2022-12-29 stsp 			break;
1070 b50a2b46 2022-12-29 stsp 
1071 b50a2b46 2022-12-29 stsp 		switch (imsg.hdr.type) {
1072 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_ERROR:
1073 b50a2b46 2022-12-29 stsp 			do_disconnect = 1;
1074 b50a2b46 2022-12-29 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1075 b50a2b46 2022-12-29 stsp 			break;
1076 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_CONNECT:
1077 b50a2b46 2022-12-29 stsp 			err = recv_connect(&client_id, &imsg);
1078 b50a2b46 2022-12-29 stsp 			break;
1079 b50a2b46 2022-12-29 stsp 		default:
1080 b50a2b46 2022-12-29 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1081 b50a2b46 2022-12-29 stsp 			break;
1082 b50a2b46 2022-12-29 stsp 		}
1083 b50a2b46 2022-12-29 stsp 
1084 b50a2b46 2022-12-29 stsp 		client = find_client(client_id);
1085 b50a2b46 2022-12-29 stsp 		if (client == NULL) {
1086 b50a2b46 2022-12-29 stsp 			log_warnx("%s: client not found", __func__);
1087 b50a2b46 2022-12-29 stsp 			imsg_free(&imsg);
1088 b50a2b46 2022-12-29 stsp 			continue;
1089 b50a2b46 2022-12-29 stsp 		}
1090 b50a2b46 2022-12-29 stsp 
1091 b50a2b46 2022-12-29 stsp 		if (err)
1092 b50a2b46 2022-12-29 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1093 b50a2b46 2022-12-29 stsp 
1094 b50a2b46 2022-12-29 stsp 		if (do_disconnect) {
1095 b50a2b46 2022-12-29 stsp 			if (err)
1096 b50a2b46 2022-12-29 stsp 				disconnect_on_error(client, err);
1097 b50a2b46 2022-12-29 stsp 			else
1098 b50a2b46 2022-12-29 stsp 				disconnect(client);
1099 b50a2b46 2022-12-29 stsp 		}
1100 b50a2b46 2022-12-29 stsp 
1101 b50a2b46 2022-12-29 stsp 		imsg_free(&imsg);
1102 b50a2b46 2022-12-29 stsp 	}
1103 b50a2b46 2022-12-29 stsp done:
1104 b50a2b46 2022-12-29 stsp 	if (!shut) {
1105 b50a2b46 2022-12-29 stsp 		gotd_imsg_event_add(iev);
1106 b50a2b46 2022-12-29 stsp 	} else {
1107 b50a2b46 2022-12-29 stsp 		/* This pipe is dead. Remove its event handler */
1108 b50a2b46 2022-12-29 stsp 		event_del(&iev->ev);
1109 b50a2b46 2022-12-29 stsp 		event_loopexit(NULL);
1110 b50a2b46 2022-12-29 stsp 	}
1111 b50a2b46 2022-12-29 stsp }
1112 b50a2b46 2022-12-29 stsp 
1113 b50a2b46 2022-12-29 stsp static void
1114 5e25db14 2022-12-29 stsp gotd_dispatch_auth_child(int fd, short event, void *arg)
1115 5e25db14 2022-12-29 stsp {
1116 5e25db14 2022-12-29 stsp 	const struct got_error *err = NULL;
1117 5e25db14 2022-12-29 stsp 	struct gotd_imsgev *iev = arg;
1118 5e25db14 2022-12-29 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1119 5e25db14 2022-12-29 stsp 	struct gotd_client *client;
1120 5e25db14 2022-12-29 stsp 	struct gotd_repo *repo = NULL;
1121 5e25db14 2022-12-29 stsp 	ssize_t n;
1122 5e25db14 2022-12-29 stsp 	int shut = 0;
1123 5e25db14 2022-12-29 stsp 	struct imsg imsg;
1124 5e25db14 2022-12-29 stsp 	uint32_t client_id = 0;
1125 5e25db14 2022-12-29 stsp 	int do_disconnect = 0;
1126 5e25db14 2022-12-29 stsp 
1127 5e25db14 2022-12-29 stsp 	client = find_client_by_proc_fd(fd);
1128 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1129 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1130 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1131 ae0cca99 2023-02-09 stsp 		shut = 1;
1132 ae0cca99 2023-02-09 stsp 		goto done;
1133 ae0cca99 2023-02-09 stsp 	}
1134 5e25db14 2022-12-29 stsp 
1135 5e25db14 2022-12-29 stsp 	if (client->auth == NULL)
1136 5e25db14 2022-12-29 stsp 		fatalx("cannot find auth child process for fd %d", fd);
1137 5e25db14 2022-12-29 stsp 
1138 5e25db14 2022-12-29 stsp 	if (event & EV_READ) {
1139 5e25db14 2022-12-29 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1140 5e25db14 2022-12-29 stsp 			fatal("imsg_read error");
1141 5e25db14 2022-12-29 stsp 		if (n == 0) {
1142 5e25db14 2022-12-29 stsp 			/* Connection closed. */
1143 5e25db14 2022-12-29 stsp 			shut = 1;
1144 5e25db14 2022-12-29 stsp 			goto done;
1145 5e25db14 2022-12-29 stsp 		}
1146 5e25db14 2022-12-29 stsp 	}
1147 5e25db14 2022-12-29 stsp 
1148 5e25db14 2022-12-29 stsp 	if (event & EV_WRITE) {
1149 5e25db14 2022-12-29 stsp 		n = msgbuf_write(&ibuf->w);
1150 5e25db14 2022-12-29 stsp 		if (n == -1 && errno != EAGAIN)
1151 5e25db14 2022-12-29 stsp 			fatal("msgbuf_write");
1152 5e25db14 2022-12-29 stsp 		if (n == 0) {
1153 5e25db14 2022-12-29 stsp 			/* Connection closed. */
1154 5e25db14 2022-12-29 stsp 			shut = 1;
1155 5e25db14 2022-12-29 stsp 		}
1156 5e25db14 2022-12-29 stsp 		goto done;
1157 5e25db14 2022-12-29 stsp 	}
1158 5e25db14 2022-12-29 stsp 
1159 5e25db14 2022-12-29 stsp 	if (client->auth->iev.ibuf.fd != fd)
1160 5e25db14 2022-12-29 stsp 		fatalx("%s: unexpected fd %d", __func__, fd);
1161 5e25db14 2022-12-29 stsp 
1162 5e25db14 2022-12-29 stsp 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1163 5e25db14 2022-12-29 stsp 		fatal("%s: imsg_get error", __func__);
1164 5e25db14 2022-12-29 stsp 	if (n == 0)	/* No more messages. */
1165 5e25db14 2022-12-29 stsp 		return;
1166 5e25db14 2022-12-29 stsp 
1167 5e25db14 2022-12-29 stsp 	evtimer_del(&client->tmo);
1168 5e25db14 2022-12-29 stsp 
1169 5e25db14 2022-12-29 stsp 	switch (imsg.hdr.type) {
1170 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ERROR:
1171 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1172 5e25db14 2022-12-29 stsp 		err = gotd_imsg_recv_error(&client_id, &imsg);
1173 5e25db14 2022-12-29 stsp 		break;
1174 5e25db14 2022-12-29 stsp 	case GOTD_IMSG_ACCESS_GRANTED:
1175 eac23c30 2023-01-10 stsp 		client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1176 5e25db14 2022-12-29 stsp 		break;
1177 5e25db14 2022-12-29 stsp 	default:
1178 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1179 5e25db14 2022-12-29 stsp 		log_debug("unexpected imsg %d", imsg.hdr.type);
1180 5e25db14 2022-12-29 stsp 		break;
1181 5e25db14 2022-12-29 stsp 	}
1182 5e25db14 2022-12-29 stsp 
1183 5e25db14 2022-12-29 stsp 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1184 5e25db14 2022-12-29 stsp 		do_disconnect = 1;
1185 5e25db14 2022-12-29 stsp 		log_debug("dropping imsg type %d from PID %d",
1186 5e25db14 2022-12-29 stsp 		    imsg.hdr.type, client->auth->pid);
1187 5e25db14 2022-12-29 stsp 	}
1188 5e25db14 2022-12-29 stsp 	imsg_free(&imsg);
1189 5e25db14 2022-12-29 stsp 
1190 5e25db14 2022-12-29 stsp 	if (do_disconnect) {
1191 5e25db14 2022-12-29 stsp 		if (err)
1192 5e25db14 2022-12-29 stsp 			disconnect_on_error(client, err);
1193 5e25db14 2022-12-29 stsp 		else
1194 5e25db14 2022-12-29 stsp 			disconnect(client);
1195 c000aa35 2023-05-01 mark 		return;
1196 5e25db14 2022-12-29 stsp 	}
1197 5e25db14 2022-12-29 stsp 
1198 b09c1279 2023-03-28 stsp 	repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1199 5e25db14 2022-12-29 stsp 	if (repo == NULL) {
1200 5e25db14 2022-12-29 stsp 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1201 5e25db14 2022-12-29 stsp 		goto done;
1202 5e25db14 2022-12-29 stsp 	}
1203 5e25db14 2022-12-29 stsp 	kill_auth_proc(client);
1204 5e25db14 2022-12-29 stsp 
1205 d30e708b 2023-01-27 op 	log_info("authenticated uid %d for repository %s",
1206 5e25db14 2022-12-29 stsp 	    client->euid, repo->name);
1207 5e25db14 2022-12-29 stsp 
1208 ae7c1b78 2023-01-10 stsp 	err = start_session_child(client, repo, gotd.argv0,
1209 7fdc3e58 2022-12-30 mark 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1210 ae7c1b78 2023-01-10 stsp 	if (err)
1211 ae7c1b78 2023-01-10 stsp 		goto done;
1212 5e25db14 2022-12-29 stsp done:
1213 5e25db14 2022-12-29 stsp 	if (err)
1214 5e25db14 2022-12-29 stsp 		log_warnx("uid %d: %s", client->euid, err->msg);
1215 5e25db14 2022-12-29 stsp 
1216 5e25db14 2022-12-29 stsp 	/* We might have killed the auth process by now. */
1217 5e25db14 2022-12-29 stsp 	if (client->auth != NULL) {
1218 5e25db14 2022-12-29 stsp 		if (!shut) {
1219 5e25db14 2022-12-29 stsp 			gotd_imsg_event_add(iev);
1220 5e25db14 2022-12-29 stsp 		} else {
1221 5e25db14 2022-12-29 stsp 			/* This pipe is dead. Remove its event handler */
1222 5e25db14 2022-12-29 stsp 			event_del(&iev->ev);
1223 5e25db14 2022-12-29 stsp 		}
1224 5e25db14 2022-12-29 stsp 	}
1225 5e25db14 2022-12-29 stsp }
1226 5e25db14 2022-12-29 stsp 
1227 ae7c1b78 2023-01-10 stsp static const struct got_error *
1228 ae7c1b78 2023-01-10 stsp connect_session(struct gotd_client *client)
1229 ae7c1b78 2023-01-10 stsp {
1230 ae7c1b78 2023-01-10 stsp 	const struct got_error *err = NULL;
1231 ae7c1b78 2023-01-10 stsp 	struct gotd_imsg_connect iconnect;
1232 ae7c1b78 2023-01-10 stsp 	int s;
1233 ae7c1b78 2023-01-10 stsp 
1234 ae7c1b78 2023-01-10 stsp 	memset(&iconnect, 0, sizeof(iconnect));
1235 ae7c1b78 2023-01-10 stsp 
1236 ae7c1b78 2023-01-10 stsp 	s = dup(client->fd);
1237 ae7c1b78 2023-01-10 stsp 	if (s == -1)
1238 ae7c1b78 2023-01-10 stsp 		return got_error_from_errno("dup");
1239 ae7c1b78 2023-01-10 stsp 
1240 ae7c1b78 2023-01-10 stsp 	iconnect.client_id = client->id;
1241 ae7c1b78 2023-01-10 stsp 	iconnect.euid = client->euid;
1242 ae7c1b78 2023-01-10 stsp 	iconnect.egid = client->egid;
1243 ae7c1b78 2023-01-10 stsp 
1244 ae7c1b78 2023-01-10 stsp 	if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1245 ae7c1b78 2023-01-10 stsp 	    PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1246 ae7c1b78 2023-01-10 stsp 		err = got_error_from_errno("imsg compose CONNECT");
1247 ae7c1b78 2023-01-10 stsp 		close(s);
1248 ae7c1b78 2023-01-10 stsp 		return err;
1249 ae7c1b78 2023-01-10 stsp 	}
1250 ae7c1b78 2023-01-10 stsp 
1251 ae7c1b78 2023-01-10 stsp 	/*
1252 ae7c1b78 2023-01-10 stsp 	 * We are no longer interested in messages from this client.
1253 ae7c1b78 2023-01-10 stsp 	 * Further client requests will be handled by the session process.
1254 ae7c1b78 2023-01-10 stsp 	 */
1255 ae7c1b78 2023-01-10 stsp 	msgbuf_clear(&client->iev.ibuf.w);
1256 ae7c1b78 2023-01-10 stsp 	imsg_clear(&client->iev.ibuf);
1257 ae7c1b78 2023-01-10 stsp 	event_del(&client->iev.ev);
1258 ae7c1b78 2023-01-10 stsp 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1259 ae7c1b78 2023-01-10 stsp 
1260 ae7c1b78 2023-01-10 stsp 	return NULL;
1261 ae7c1b78 2023-01-10 stsp }
1262 ae7c1b78 2023-01-10 stsp 
1263 5e25db14 2022-12-29 stsp static void
1264 ae7c1b78 2023-01-10 stsp gotd_dispatch_client_session(int fd, short event, void *arg)
1265 b50a2b46 2022-12-29 stsp {
1266 b50a2b46 2022-12-29 stsp 	struct gotd_imsgev *iev = arg;
1267 b50a2b46 2022-12-29 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1268 13b2bc37 2022-10-23 stsp 	struct gotd_child_proc *proc = NULL;
1269 b50a2b46 2022-12-29 stsp 	struct gotd_client *client = NULL;
1270 13b2bc37 2022-10-23 stsp 	ssize_t n;
1271 13b2bc37 2022-10-23 stsp 	int shut = 0;
1272 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
1273 13b2bc37 2022-10-23 stsp 
1274 ae7c1b78 2023-01-10 stsp 	client = find_client_by_proc_fd(fd);
1275 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1276 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1277 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1278 ae0cca99 2023-02-09 stsp 		shut = 1;
1279 ae0cca99 2023-02-09 stsp 		goto done;
1280 ae0cca99 2023-02-09 stsp 	}
1281 ae7c1b78 2023-01-10 stsp 
1282 13b2bc37 2022-10-23 stsp 	if (event & EV_READ) {
1283 13b2bc37 2022-10-23 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1284 13b2bc37 2022-10-23 stsp 			fatal("imsg_read error");
1285 13b2bc37 2022-10-23 stsp 		if (n == 0) {
1286 13b2bc37 2022-10-23 stsp 			/* Connection closed. */
1287 13b2bc37 2022-10-23 stsp 			shut = 1;
1288 13b2bc37 2022-10-23 stsp 			goto done;
1289 13b2bc37 2022-10-23 stsp 		}
1290 13b2bc37 2022-10-23 stsp 	}
1291 13b2bc37 2022-10-23 stsp 
1292 13b2bc37 2022-10-23 stsp 	if (event & EV_WRITE) {
1293 13b2bc37 2022-10-23 stsp 		n = msgbuf_write(&ibuf->w);
1294 13b2bc37 2022-10-23 stsp 		if (n == -1 && errno != EAGAIN)
1295 13b2bc37 2022-10-23 stsp 			fatal("msgbuf_write");
1296 13b2bc37 2022-10-23 stsp 		if (n == 0) {
1297 13b2bc37 2022-10-23 stsp 			/* Connection closed. */
1298 13b2bc37 2022-10-23 stsp 			shut = 1;
1299 13b2bc37 2022-10-23 stsp 			goto done;
1300 ae7c1b78 2023-01-10 stsp 		}
1301 ae7c1b78 2023-01-10 stsp 	}
1302 ae7c1b78 2023-01-10 stsp 
1303 ae7c1b78 2023-01-10 stsp 	proc = client->session;
1304 ae7c1b78 2023-01-10 stsp 	if (proc == NULL)
1305 ae7c1b78 2023-01-10 stsp 		fatalx("cannot find session child process for fd %d", fd);
1306 ae7c1b78 2023-01-10 stsp 
1307 ae7c1b78 2023-01-10 stsp 	for (;;) {
1308 ae7c1b78 2023-01-10 stsp 		const struct got_error *err = NULL;
1309 ae7c1b78 2023-01-10 stsp 		uint32_t client_id = 0;
1310 ae7c1b78 2023-01-10 stsp 		int do_disconnect = 0, do_start_repo_child = 0;
1311 ae7c1b78 2023-01-10 stsp 
1312 ae7c1b78 2023-01-10 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1313 ae7c1b78 2023-01-10 stsp 			fatal("%s: imsg_get error", __func__);
1314 ae7c1b78 2023-01-10 stsp 		if (n == 0)	/* No more messages. */
1315 ae7c1b78 2023-01-10 stsp 			break;
1316 ae7c1b78 2023-01-10 stsp 
1317 ae7c1b78 2023-01-10 stsp 		switch (imsg.hdr.type) {
1318 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_ERROR:
1319 ae7c1b78 2023-01-10 stsp 			do_disconnect = 1;
1320 ae7c1b78 2023-01-10 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1321 ae7c1b78 2023-01-10 stsp 			break;
1322 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_CLIENT_SESSION_READY:
1323 eac23c30 2023-01-10 stsp 			if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1324 ae7c1b78 2023-01-10 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1325 ae7c1b78 2023-01-10 stsp 				break;
1326 ae7c1b78 2023-01-10 stsp 			}
1327 ae7c1b78 2023-01-10 stsp 			do_start_repo_child = 1;
1328 ae7c1b78 2023-01-10 stsp 			break;
1329 ae7c1b78 2023-01-10 stsp 		case GOTD_IMSG_DISCONNECT:
1330 ae7c1b78 2023-01-10 stsp 			do_disconnect = 1;
1331 ae7c1b78 2023-01-10 stsp 			break;
1332 ae7c1b78 2023-01-10 stsp 		default:
1333 ae7c1b78 2023-01-10 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1334 ae7c1b78 2023-01-10 stsp 			break;
1335 13b2bc37 2022-10-23 stsp 		}
1336 ae7c1b78 2023-01-10 stsp 
1337 ae7c1b78 2023-01-10 stsp 		if (!verify_imsg_src(client, proc, &imsg)) {
1338 ae7c1b78 2023-01-10 stsp 			log_debug("dropping imsg type %d from PID %d",
1339 ae7c1b78 2023-01-10 stsp 			    imsg.hdr.type, proc->pid);
1340 ae7c1b78 2023-01-10 stsp 			imsg_free(&imsg);
1341 ae7c1b78 2023-01-10 stsp 			continue;
1342 ae7c1b78 2023-01-10 stsp 		}
1343 ae7c1b78 2023-01-10 stsp 		if (err)
1344 ae7c1b78 2023-01-10 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1345 ae7c1b78 2023-01-10 stsp 
1346 ae7c1b78 2023-01-10 stsp 		if (do_start_repo_child) {
1347 ae7c1b78 2023-01-10 stsp 			struct gotd_repo *repo;
1348 b09c1279 2023-03-28 stsp 			const char *name = client->session->repo_name;
1349 ae7c1b78 2023-01-10 stsp 
1350 b09c1279 2023-03-28 stsp 			repo = gotd_find_repo_by_name(name, &gotd);
1351 ae7c1b78 2023-01-10 stsp 			if (repo != NULL) {
1352 ae7c1b78 2023-01-10 stsp 				enum gotd_procid proc_type;
1353 ae7c1b78 2023-01-10 stsp 
1354 ae7c1b78 2023-01-10 stsp 				if (client->required_auth & GOTD_AUTH_WRITE)
1355 ae7c1b78 2023-01-10 stsp 					proc_type = PROC_REPO_WRITE;
1356 ae7c1b78 2023-01-10 stsp 				else
1357 ae7c1b78 2023-01-10 stsp 					proc_type = PROC_REPO_READ;
1358 ae7c1b78 2023-01-10 stsp 
1359 ae7c1b78 2023-01-10 stsp 				err = start_repo_child(client, proc_type, repo,
1360 ae7c1b78 2023-01-10 stsp 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1361 ae7c1b78 2023-01-10 stsp 				    gotd.verbosity);
1362 ae7c1b78 2023-01-10 stsp 			} else
1363 ae7c1b78 2023-01-10 stsp 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1364 ae7c1b78 2023-01-10 stsp 
1365 ae7c1b78 2023-01-10 stsp 			if (err) {
1366 ae7c1b78 2023-01-10 stsp 				log_warnx("uid %d: %s", client->euid, err->msg);
1367 ae7c1b78 2023-01-10 stsp 				do_disconnect = 1;
1368 ae7c1b78 2023-01-10 stsp 			}
1369 ae7c1b78 2023-01-10 stsp 		}
1370 ae7c1b78 2023-01-10 stsp 
1371 ae7c1b78 2023-01-10 stsp 		if (do_disconnect) {
1372 ae7c1b78 2023-01-10 stsp 			if (err)
1373 ae7c1b78 2023-01-10 stsp 				disconnect_on_error(client, err);
1374 ae7c1b78 2023-01-10 stsp 			else
1375 ae7c1b78 2023-01-10 stsp 				disconnect(client);
1376 ae7c1b78 2023-01-10 stsp 		}
1377 ae7c1b78 2023-01-10 stsp 
1378 ae7c1b78 2023-01-10 stsp 		imsg_free(&imsg);
1379 13b2bc37 2022-10-23 stsp 	}
1380 ae7c1b78 2023-01-10 stsp done:
1381 ae7c1b78 2023-01-10 stsp 	if (!shut) {
1382 ae7c1b78 2023-01-10 stsp 		gotd_imsg_event_add(iev);
1383 ae7c1b78 2023-01-10 stsp 	} else {
1384 ae7c1b78 2023-01-10 stsp 		/* This pipe is dead. Remove its event handler */
1385 ae7c1b78 2023-01-10 stsp 		event_del(&iev->ev);
1386 ae7c1b78 2023-01-10 stsp 		disconnect(client);
1387 ae7c1b78 2023-01-10 stsp 	}
1388 ae7c1b78 2023-01-10 stsp }
1389 13b2bc37 2022-10-23 stsp 
1390 ae7c1b78 2023-01-10 stsp static void
1391 ae7c1b78 2023-01-10 stsp gotd_dispatch_repo_child(int fd, short event, void *arg)
1392 ae7c1b78 2023-01-10 stsp {
1393 ae7c1b78 2023-01-10 stsp 	struct gotd_imsgev *iev = arg;
1394 ae7c1b78 2023-01-10 stsp 	struct imsgbuf *ibuf = &iev->ibuf;
1395 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc *proc = NULL;
1396 ae7c1b78 2023-01-10 stsp 	struct gotd_client *client;
1397 ae7c1b78 2023-01-10 stsp 	ssize_t n;
1398 ae7c1b78 2023-01-10 stsp 	int shut = 0;
1399 ae7c1b78 2023-01-10 stsp 	struct imsg imsg;
1400 ae7c1b78 2023-01-10 stsp 
1401 b50a2b46 2022-12-29 stsp 	client = find_client_by_proc_fd(fd);
1402 ae0cca99 2023-02-09 stsp 	if (client == NULL) {
1403 ae0cca99 2023-02-09 stsp 		/* Can happen during process teardown. */
1404 ae0cca99 2023-02-09 stsp 		warnx("cannot find client for fd %d", fd);
1405 ae0cca99 2023-02-09 stsp 		shut = 1;
1406 ae0cca99 2023-02-09 stsp 		goto done;
1407 ae0cca99 2023-02-09 stsp 	}
1408 b50a2b46 2022-12-29 stsp 
1409 ae7c1b78 2023-01-10 stsp 	if (event & EV_READ) {
1410 ae7c1b78 2023-01-10 stsp 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1411 ae7c1b78 2023-01-10 stsp 			fatal("imsg_read error");
1412 ae7c1b78 2023-01-10 stsp 		if (n == 0) {
1413 ae7c1b78 2023-01-10 stsp 			/* Connection closed. */
1414 ae7c1b78 2023-01-10 stsp 			shut = 1;
1415 ae7c1b78 2023-01-10 stsp 			goto done;
1416 ae7c1b78 2023-01-10 stsp 		}
1417 ae7c1b78 2023-01-10 stsp 	}
1418 ae7c1b78 2023-01-10 stsp 
1419 ae7c1b78 2023-01-10 stsp 	if (event & EV_WRITE) {
1420 ae7c1b78 2023-01-10 stsp 		n = msgbuf_write(&ibuf->w);
1421 ae7c1b78 2023-01-10 stsp 		if (n == -1 && errno != EAGAIN)
1422 ae7c1b78 2023-01-10 stsp 			fatal("msgbuf_write");
1423 ae7c1b78 2023-01-10 stsp 		if (n == 0) {
1424 ae7c1b78 2023-01-10 stsp 			/* Connection closed. */
1425 ae7c1b78 2023-01-10 stsp 			shut = 1;
1426 ae7c1b78 2023-01-10 stsp 			goto done;
1427 ae7c1b78 2023-01-10 stsp 		}
1428 ae7c1b78 2023-01-10 stsp 	}
1429 ae7c1b78 2023-01-10 stsp 
1430 f7a854cf 2023-01-10 stsp 	proc = client->repo;
1431 13b2bc37 2022-10-23 stsp 	if (proc == NULL)
1432 13b2bc37 2022-10-23 stsp 		fatalx("cannot find child process for fd %d", fd);
1433 13b2bc37 2022-10-23 stsp 
1434 13b2bc37 2022-10-23 stsp 	for (;;) {
1435 13b2bc37 2022-10-23 stsp 		const struct got_error *err = NULL;
1436 13b2bc37 2022-10-23 stsp 		uint32_t client_id = 0;
1437 13b2bc37 2022-10-23 stsp 		int do_disconnect = 0;
1438 13b2bc37 2022-10-23 stsp 
1439 13b2bc37 2022-10-23 stsp 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1440 13b2bc37 2022-10-23 stsp 			fatal("%s: imsg_get error", __func__);
1441 13b2bc37 2022-10-23 stsp 		if (n == 0)	/* No more messages. */
1442 13b2bc37 2022-10-23 stsp 			break;
1443 13b2bc37 2022-10-23 stsp 
1444 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1445 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1446 13b2bc37 2022-10-23 stsp 			do_disconnect = 1;
1447 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(&client_id, &imsg);
1448 13b2bc37 2022-10-23 stsp 			break;
1449 b50a2b46 2022-12-29 stsp 		case GOTD_IMSG_REPO_CHILD_READY:
1450 ae7c1b78 2023-01-10 stsp 			err = connect_session(client);
1451 ae7c1b78 2023-01-10 stsp 			if (err)
1452 ae7c1b78 2023-01-10 stsp 				break;
1453 ae7c1b78 2023-01-10 stsp 			err = connect_repo_child(client, proc);
1454 d93ecf7d 2022-12-14 stsp 			break;
1455 13b2bc37 2022-10-23 stsp 		default:
1456 13b2bc37 2022-10-23 stsp 			log_debug("unexpected imsg %d", imsg.hdr.type);
1457 13b2bc37 2022-10-23 stsp 			break;
1458 13b2bc37 2022-10-23 stsp 		}
1459 13b2bc37 2022-10-23 stsp 
1460 13b2bc37 2022-10-23 stsp 		if (!verify_imsg_src(client, proc, &imsg)) {
1461 13b2bc37 2022-10-23 stsp 			log_debug("dropping imsg type %d from PID %d",
1462 13b2bc37 2022-10-23 stsp 			    imsg.hdr.type, proc->pid);
1463 13b2bc37 2022-10-23 stsp 			imsg_free(&imsg);
1464 13b2bc37 2022-10-23 stsp 			continue;
1465 13b2bc37 2022-10-23 stsp 		}
1466 13b2bc37 2022-10-23 stsp 		if (err)
1467 13b2bc37 2022-10-23 stsp 			log_warnx("uid %d: %s", client->euid, err->msg);
1468 13b2bc37 2022-10-23 stsp 
1469 13b2bc37 2022-10-23 stsp 		if (do_disconnect) {
1470 13b2bc37 2022-10-23 stsp 			if (err)
1471 13b2bc37 2022-10-23 stsp 				disconnect_on_error(client, err);
1472 13b2bc37 2022-10-23 stsp 			else
1473 13b2bc37 2022-10-23 stsp 				disconnect(client);
1474 36c7cfbb 2022-11-04 stsp 		}
1475 ae7c1b78 2023-01-10 stsp 
1476 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1477 13b2bc37 2022-10-23 stsp 	}
1478 13b2bc37 2022-10-23 stsp done:
1479 13b2bc37 2022-10-23 stsp 	if (!shut) {
1480 13b2bc37 2022-10-23 stsp 		gotd_imsg_event_add(iev);
1481 13b2bc37 2022-10-23 stsp 	} else {
1482 13b2bc37 2022-10-23 stsp 		/* This pipe is dead. Remove its event handler */
1483 13b2bc37 2022-10-23 stsp 		event_del(&iev->ev);
1484 ae7c1b78 2023-01-10 stsp 		disconnect(client);
1485 13b2bc37 2022-10-23 stsp 	}
1486 13b2bc37 2022-10-23 stsp }
1487 13b2bc37 2022-10-23 stsp 
1488 13b2bc37 2022-10-23 stsp static pid_t
1489 eec68231 2022-12-14 stsp start_child(enum gotd_procid proc_id, const char *repo_path,
1490 585362fd 2022-10-31 op     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1491 13b2bc37 2022-10-23 stsp {
1492 585362fd 2022-10-31 op 	char	*argv[11];
1493 13b2bc37 2022-10-23 stsp 	int	 argc = 0;
1494 13b2bc37 2022-10-23 stsp 	pid_t	 pid;
1495 13b2bc37 2022-10-23 stsp 
1496 13b2bc37 2022-10-23 stsp 	switch (pid = fork()) {
1497 13b2bc37 2022-10-23 stsp 	case -1:
1498 13b2bc37 2022-10-23 stsp 		fatal("cannot fork");
1499 13b2bc37 2022-10-23 stsp 	case 0:
1500 13b2bc37 2022-10-23 stsp 		break;
1501 13b2bc37 2022-10-23 stsp 	default:
1502 13b2bc37 2022-10-23 stsp 		close(fd);
1503 13b2bc37 2022-10-23 stsp 		return pid;
1504 13b2bc37 2022-10-23 stsp 	}
1505 13b2bc37 2022-10-23 stsp 
1506 8c6fc146 2022-11-17 stsp 	if (fd != GOTD_FILENO_MSG_PIPE) {
1507 8c6fc146 2022-11-17 stsp 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1508 13b2bc37 2022-10-23 stsp 			fatal("cannot setup imsg fd");
1509 13b2bc37 2022-10-23 stsp 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1510 13b2bc37 2022-10-23 stsp 		fatal("cannot setup imsg fd");
1511 13b2bc37 2022-10-23 stsp 
1512 13b2bc37 2022-10-23 stsp 	argv[argc++] = argv0;
1513 13b2bc37 2022-10-23 stsp 	switch (proc_id) {
1514 d93ecf7d 2022-12-14 stsp 	case PROC_LISTEN:
1515 d93ecf7d 2022-12-14 stsp 		argv[argc++] = (char *)"-L";
1516 d93ecf7d 2022-12-14 stsp 		break;
1517 5e25db14 2022-12-29 stsp 	case PROC_AUTH:
1518 5e25db14 2022-12-29 stsp 		argv[argc++] = (char *)"-A";
1519 5e25db14 2022-12-29 stsp 		break;
1520 b0614828 2023-06-19 stsp 	case PROC_SESSION_READ:
1521 b0614828 2023-06-19 stsp 		argv[argc++] = (char *)"-s";
1522 b0614828 2023-06-19 stsp 		break;
1523 b0614828 2023-06-19 stsp 	case PROC_SESSION_WRITE:
1524 ae7c1b78 2023-01-10 stsp 		argv[argc++] = (char *)"-S";
1525 ae7c1b78 2023-01-10 stsp 		break;
1526 13b2bc37 2022-10-23 stsp 	case PROC_REPO_READ:
1527 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-R";
1528 13b2bc37 2022-10-23 stsp 		break;
1529 13b2bc37 2022-10-23 stsp 	case PROC_REPO_WRITE:
1530 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-W";
1531 13b2bc37 2022-10-23 stsp 		break;
1532 13b2bc37 2022-10-23 stsp 	default:
1533 13b2bc37 2022-10-23 stsp 		fatalx("invalid process id %d", proc_id);
1534 13b2bc37 2022-10-23 stsp 	}
1535 13b2bc37 2022-10-23 stsp 
1536 585362fd 2022-10-31 op 	argv[argc++] = (char *)"-f";
1537 585362fd 2022-10-31 op 	argv[argc++] = (char *)confpath;
1538 585362fd 2022-10-31 op 
1539 eec68231 2022-12-14 stsp 	if (repo_path) {
1540 d93ecf7d 2022-12-14 stsp 		argv[argc++] = (char *)"-P";
1541 eec68231 2022-12-14 stsp 		argv[argc++] = (char *)repo_path;
1542 d93ecf7d 2022-12-14 stsp 	}
1543 13b2bc37 2022-10-23 stsp 
1544 13b2bc37 2022-10-23 stsp 	if (!daemonize)
1545 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-d";
1546 13b2bc37 2022-10-23 stsp 	if (verbosity > 0)
1547 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-v";
1548 13b2bc37 2022-10-23 stsp 	if (verbosity > 1)
1549 13b2bc37 2022-10-23 stsp 		argv[argc++] = (char *)"-v";
1550 13b2bc37 2022-10-23 stsp 	argv[argc++] = NULL;
1551 13b2bc37 2022-10-23 stsp 
1552 13b2bc37 2022-10-23 stsp 	execvp(argv0, argv);
1553 13b2bc37 2022-10-23 stsp 	fatal("execvp");
1554 13b2bc37 2022-10-23 stsp }
1555 13b2bc37 2022-10-23 stsp 
1556 13b2bc37 2022-10-23 stsp static void
1557 d93ecf7d 2022-12-14 stsp start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1558 d93ecf7d 2022-12-14 stsp {
1559 c929736a 2023-06-22 op 	struct gotd_child_proc *proc;
1560 d93ecf7d 2022-12-14 stsp 
1561 c929736a 2023-06-22 op 	proc = calloc(1, sizeof(*proc));
1562 c929736a 2023-06-22 op 	if (proc == NULL)
1563 c929736a 2023-06-22 op 		fatal("calloc");
1564 c929736a 2023-06-22 op 
1565 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1566 839338f6 2023-06-22 op 
1567 839338f6 2023-06-22 op 	/* proc->tmo is initialized in main() after event_init() */
1568 839338f6 2023-06-22 op 
1569 d93ecf7d 2022-12-14 stsp 	proc->type = PROC_LISTEN;
1570 d93ecf7d 2022-12-14 stsp 
1571 d93ecf7d 2022-12-14 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1572 d93ecf7d 2022-12-14 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1573 d93ecf7d 2022-12-14 stsp 		fatal("socketpair");
1574 d93ecf7d 2022-12-14 stsp 
1575 d93ecf7d 2022-12-14 stsp 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1576 d93ecf7d 2022-12-14 stsp 	    proc->pipe[1], daemonize, verbosity);
1577 d93ecf7d 2022-12-14 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1578 b50a2b46 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_listener;
1579 d93ecf7d 2022-12-14 stsp 	proc->iev.events = EV_READ;
1580 d93ecf7d 2022-12-14 stsp 	proc->iev.handler_arg = NULL;
1581 c929736a 2023-06-22 op 
1582 c929736a 2023-06-22 op 	gotd.listen_proc = proc;
1583 d93ecf7d 2022-12-14 stsp }
1584 d93ecf7d 2022-12-14 stsp 
1585 b50a2b46 2022-12-29 stsp static const struct got_error *
1586 ae7c1b78 2023-01-10 stsp start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1587 ae7c1b78 2023-01-10 stsp     char *argv0, const char *confpath, int daemonize, int verbosity)
1588 ae7c1b78 2023-01-10 stsp {
1589 ae7c1b78 2023-01-10 stsp 	struct gotd_child_proc *proc;
1590 ae7c1b78 2023-01-10 stsp 
1591 ae7c1b78 2023-01-10 stsp 	proc = calloc(1, sizeof(*proc));
1592 ae7c1b78 2023-01-10 stsp 	if (proc == NULL)
1593 ae7c1b78 2023-01-10 stsp 		return got_error_from_errno("calloc");
1594 ae7c1b78 2023-01-10 stsp 
1595 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1596 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1597 839338f6 2023-06-22 op 
1598 b0614828 2023-06-19 stsp 	if (client_is_reading(client))
1599 b0614828 2023-06-19 stsp 		proc->type = PROC_SESSION_READ;
1600 b0614828 2023-06-19 stsp 	else
1601 b0614828 2023-06-19 stsp 		proc->type = PROC_SESSION_WRITE;
1602 ae7c1b78 2023-01-10 stsp 	if (strlcpy(proc->repo_name, repo->name,
1603 ae7c1b78 2023-01-10 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1604 ae7c1b78 2023-01-10 stsp 		fatalx("repository name too long: %s", repo->name);
1605 ae7c1b78 2023-01-10 stsp 	log_debug("starting client uid %d session for repository %s",
1606 ae7c1b78 2023-01-10 stsp 	    client->euid, repo->name);
1607 ae7c1b78 2023-01-10 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1608 ae7c1b78 2023-01-10 stsp 	    sizeof(proc->repo_path))
1609 ae7c1b78 2023-01-10 stsp 		fatalx("repository path too long: %s", repo->path);
1610 ae7c1b78 2023-01-10 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1611 ae7c1b78 2023-01-10 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1612 ae7c1b78 2023-01-10 stsp 		fatal("socketpair");
1613 ae7c1b78 2023-01-10 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1614 ae7c1b78 2023-01-10 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1615 ae7c1b78 2023-01-10 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1616 ae7c1b78 2023-01-10 stsp 	log_debug("proc %s %s is on fd %d",
1617 ae7c1b78 2023-01-10 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1618 ae7c1b78 2023-01-10 stsp 	    proc->pipe[0]);
1619 ae7c1b78 2023-01-10 stsp 	proc->iev.handler = gotd_dispatch_client_session;
1620 ae7c1b78 2023-01-10 stsp 	proc->iev.events = EV_READ;
1621 ae7c1b78 2023-01-10 stsp 	proc->iev.handler_arg = NULL;
1622 ae7c1b78 2023-01-10 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1623 ae7c1b78 2023-01-10 stsp 	    gotd_dispatch_client_session, &proc->iev);
1624 ae7c1b78 2023-01-10 stsp 	gotd_imsg_event_add(&proc->iev);
1625 ae7c1b78 2023-01-10 stsp 
1626 ae7c1b78 2023-01-10 stsp 	client->session = proc;
1627 ae7c1b78 2023-01-10 stsp 	return NULL;
1628 ae7c1b78 2023-01-10 stsp }
1629 ae7c1b78 2023-01-10 stsp 
1630 ae7c1b78 2023-01-10 stsp static const struct got_error *
1631 b50a2b46 2022-12-29 stsp start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1632 b50a2b46 2022-12-29 stsp     struct gotd_repo *repo, char *argv0, const char *confpath,
1633 585362fd 2022-10-31 op     int daemonize, int verbosity)
1634 13b2bc37 2022-10-23 stsp {
1635 13b2bc37 2022-10-23 stsp 	struct gotd_child_proc *proc;
1636 13b2bc37 2022-10-23 stsp 
1637 b50a2b46 2022-12-29 stsp 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1638 b50a2b46 2022-12-29 stsp 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1639 7fdc3e58 2022-12-30 mark 
1640 b50a2b46 2022-12-29 stsp 	proc = calloc(1, sizeof(*proc));
1641 b50a2b46 2022-12-29 stsp 	if (proc == NULL)
1642 b50a2b46 2022-12-29 stsp 		return got_error_from_errno("calloc");
1643 13b2bc37 2022-10-23 stsp 
1644 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1645 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1646 839338f6 2023-06-22 op 
1647 b50a2b46 2022-12-29 stsp 	proc->type = proc_type;
1648 b50a2b46 2022-12-29 stsp 	if (strlcpy(proc->repo_name, repo->name,
1649 b50a2b46 2022-12-29 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1650 b50a2b46 2022-12-29 stsp 		fatalx("repository name too long: %s", repo->name);
1651 b50a2b46 2022-12-29 stsp 	log_debug("starting %s for repository %s",
1652 b50a2b46 2022-12-29 stsp 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1653 9b7f22a6 2023-01-08 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1654 9b7f22a6 2023-01-08 stsp 	    sizeof(proc->repo_path))
1655 9b7f22a6 2023-01-08 stsp 		fatalx("repository path too long: %s", repo->path);
1656 b50a2b46 2022-12-29 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1657 b50a2b46 2022-12-29 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1658 b50a2b46 2022-12-29 stsp 		fatal("socketpair");
1659 b50a2b46 2022-12-29 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1660 b50a2b46 2022-12-29 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1661 b50a2b46 2022-12-29 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1662 b50a2b46 2022-12-29 stsp 	log_debug("proc %s %s is on fd %d",
1663 b50a2b46 2022-12-29 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1664 b50a2b46 2022-12-29 stsp 	    proc->pipe[0]);
1665 b50a2b46 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_repo_child;
1666 b50a2b46 2022-12-29 stsp 	proc->iev.events = EV_READ;
1667 b50a2b46 2022-12-29 stsp 	proc->iev.handler_arg = NULL;
1668 b50a2b46 2022-12-29 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1669 b50a2b46 2022-12-29 stsp 	    gotd_dispatch_repo_child, &proc->iev);
1670 b50a2b46 2022-12-29 stsp 	gotd_imsg_event_add(&proc->iev);
1671 b50a2b46 2022-12-29 stsp 
1672 f7a854cf 2023-01-10 stsp 	client->repo = proc;
1673 5e25db14 2022-12-29 stsp 	return NULL;
1674 5e25db14 2022-12-29 stsp }
1675 5e25db14 2022-12-29 stsp 
1676 5e25db14 2022-12-29 stsp static const struct got_error *
1677 5e25db14 2022-12-29 stsp start_auth_child(struct gotd_client *client, int required_auth,
1678 5e25db14 2022-12-29 stsp     struct gotd_repo *repo, char *argv0, const char *confpath,
1679 5e25db14 2022-12-29 stsp     int daemonize, int verbosity)
1680 5e25db14 2022-12-29 stsp {
1681 365cf0f3 2022-12-29 stsp 	const struct got_error *err = NULL;
1682 5e25db14 2022-12-29 stsp 	struct gotd_child_proc *proc;
1683 5e25db14 2022-12-29 stsp 	struct gotd_imsg_auth iauth;
1684 365cf0f3 2022-12-29 stsp 	int fd;
1685 5e25db14 2022-12-29 stsp 
1686 5e25db14 2022-12-29 stsp 	memset(&iauth, 0, sizeof(iauth));
1687 365cf0f3 2022-12-29 stsp 
1688 365cf0f3 2022-12-29 stsp 	fd = dup(client->fd);
1689 365cf0f3 2022-12-29 stsp 	if (fd == -1)
1690 365cf0f3 2022-12-29 stsp 		return got_error_from_errno("dup");
1691 5e25db14 2022-12-29 stsp 
1692 5e25db14 2022-12-29 stsp 	proc = calloc(1, sizeof(*proc));
1693 365cf0f3 2022-12-29 stsp 	if (proc == NULL) {
1694 365cf0f3 2022-12-29 stsp 		err = got_error_from_errno("calloc");
1695 365cf0f3 2022-12-29 stsp 		close(fd);
1696 365cf0f3 2022-12-29 stsp 		return err;
1697 365cf0f3 2022-12-29 stsp 	}
1698 839338f6 2023-06-22 op 
1699 839338f6 2023-06-22 op 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1700 839338f6 2023-06-22 op 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1701 5e25db14 2022-12-29 stsp 
1702 5e25db14 2022-12-29 stsp 	proc->type = PROC_AUTH;
1703 5e25db14 2022-12-29 stsp 	if (strlcpy(proc->repo_name, repo->name,
1704 5e25db14 2022-12-29 stsp 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1705 5e25db14 2022-12-29 stsp 		fatalx("repository name too long: %s", repo->name);
1706 5e25db14 2022-12-29 stsp 	log_debug("starting auth for uid %d repository %s",
1707 5e25db14 2022-12-29 stsp 	    client->euid, repo->name);
1708 9b7f22a6 2023-01-08 stsp 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1709 9b7f22a6 2023-01-08 stsp 	    sizeof(proc->repo_path))
1710 9b7f22a6 2023-01-08 stsp 		fatalx("repository path too long: %s", repo->path);
1711 5e25db14 2022-12-29 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1712 5e25db14 2022-12-29 stsp 	    PF_UNSPEC, proc->pipe) == -1)
1713 5e25db14 2022-12-29 stsp 		fatal("socketpair");
1714 5e25db14 2022-12-29 stsp 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1715 5e25db14 2022-12-29 stsp 	    confpath, proc->pipe[1], daemonize, verbosity);
1716 5e25db14 2022-12-29 stsp 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1717 5e25db14 2022-12-29 stsp 	log_debug("proc %s %s is on fd %d",
1718 5e25db14 2022-12-29 stsp 	    gotd_proc_names[proc->type], proc->repo_path,
1719 5e25db14 2022-12-29 stsp 	    proc->pipe[0]);
1720 5e25db14 2022-12-29 stsp 	proc->iev.handler = gotd_dispatch_auth_child;
1721 5e25db14 2022-12-29 stsp 	proc->iev.events = EV_READ;
1722 5e25db14 2022-12-29 stsp 	proc->iev.handler_arg = NULL;
1723 5e25db14 2022-12-29 stsp 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1724 5e25db14 2022-12-29 stsp 	    gotd_dispatch_auth_child, &proc->iev);
1725 5e25db14 2022-12-29 stsp 	gotd_imsg_event_add(&proc->iev);
1726 5e25db14 2022-12-29 stsp 
1727 5e25db14 2022-12-29 stsp 	iauth.euid = client->euid;
1728 5e25db14 2022-12-29 stsp 	iauth.egid = client->egid;
1729 5e25db14 2022-12-29 stsp 	iauth.required_auth = required_auth;
1730 5e25db14 2022-12-29 stsp 	iauth.client_id = client->id;
1731 5e25db14 2022-12-29 stsp 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1732 365cf0f3 2022-12-29 stsp 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1733 5e25db14 2022-12-29 stsp 		log_warn("imsg compose AUTHENTICATE");
1734 365cf0f3 2022-12-29 stsp 		close(fd);
1735 365cf0f3 2022-12-29 stsp 		/* Let the auth_timeout handler tidy up. */
1736 365cf0f3 2022-12-29 stsp 	}
1737 b50a2b46 2022-12-29 stsp 
1738 5e25db14 2022-12-29 stsp 	client->auth = proc;
1739 5e25db14 2022-12-29 stsp 	client->required_auth = required_auth;
1740 b50a2b46 2022-12-29 stsp 	return NULL;
1741 eec68231 2022-12-14 stsp }
1742 eec68231 2022-12-14 stsp 
1743 eec68231 2022-12-14 stsp static void
1744 b0614828 2023-06-19 stsp apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1745 eec68231 2022-12-14 stsp {
1746 b0614828 2023-06-19 stsp 	if (need_tmpdir) {
1747 b0614828 2023-06-19 stsp 		if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1748 b0614828 2023-06-19 stsp 			fatal("unveil %s", GOT_TMPDIR_STR);
1749 b0614828 2023-06-19 stsp 	}
1750 b0614828 2023-06-19 stsp 
1751 eec68231 2022-12-14 stsp 	if (unveil(repo_path, "r") == -1)
1752 eec68231 2022-12-14 stsp 		fatal("unveil %s", repo_path);
1753 44587340 2022-12-30 stsp 
1754 44587340 2022-12-30 stsp 	if (unveil(NULL, NULL) == -1)
1755 44587340 2022-12-30 stsp 		fatal("unveil");
1756 44587340 2022-12-30 stsp }
1757 44587340 2022-12-30 stsp 
1758 44587340 2022-12-30 stsp static void
1759 ae7c1b78 2023-01-10 stsp apply_unveil_repo_readwrite(const char *repo_path)
1760 ae7c1b78 2023-01-10 stsp {
1761 ae7c1b78 2023-01-10 stsp 	if (unveil(repo_path, "rwc") == -1)
1762 ae7c1b78 2023-01-10 stsp 		fatal("unveil %s", repo_path);
1763 ae7c1b78 2023-01-10 stsp 
1764 ae7c1b78 2023-01-10 stsp 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1765 ae7c1b78 2023-01-10 stsp 		fatal("unveil %s", GOT_TMPDIR_STR);
1766 ae7c1b78 2023-01-10 stsp 
1767 ae7c1b78 2023-01-10 stsp 	if (unveil(NULL, NULL) == -1)
1768 ae7c1b78 2023-01-10 stsp 		fatal("unveil");
1769 ae7c1b78 2023-01-10 stsp }
1770 ae7c1b78 2023-01-10 stsp 
1771 ae7c1b78 2023-01-10 stsp static void
1772 44587340 2022-12-30 stsp apply_unveil_none(void)
1773 44587340 2022-12-30 stsp {
1774 44587340 2022-12-30 stsp 	if (unveil("/", "") == -1)
1775 44587340 2022-12-30 stsp 		fatal("unveil");
1776 eec68231 2022-12-14 stsp 
1777 eec68231 2022-12-14 stsp 	if (unveil(NULL, NULL) == -1)
1778 eec68231 2022-12-14 stsp 		fatal("unveil");
1779 13b2bc37 2022-10-23 stsp }
1780 13b2bc37 2022-10-23 stsp 
1781 13b2bc37 2022-10-23 stsp static void
1782 ae7c1b78 2023-01-10 stsp apply_unveil_selfexec(void)
1783 13b2bc37 2022-10-23 stsp {
1784 b50a2b46 2022-12-29 stsp 	if (unveil(gotd.argv0, "x") == -1)
1785 b50a2b46 2022-12-29 stsp 		fatal("unveil %s", gotd.argv0);
1786 b50a2b46 2022-12-29 stsp 
1787 13b2bc37 2022-10-23 stsp 	if (unveil(NULL, NULL) == -1)
1788 13b2bc37 2022-10-23 stsp 		fatal("unveil");
1789 13b2bc37 2022-10-23 stsp }
1790 13b2bc37 2022-10-23 stsp 
1791 13b2bc37 2022-10-23 stsp int
1792 13b2bc37 2022-10-23 stsp main(int argc, char **argv)
1793 13b2bc37 2022-10-23 stsp {
1794 13b2bc37 2022-10-23 stsp 	const struct got_error *error = NULL;
1795 13b2bc37 2022-10-23 stsp 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1796 13b2bc37 2022-10-23 stsp 	const char *confpath = GOTD_CONF_PATH;
1797 13b2bc37 2022-10-23 stsp 	char *argv0 = argv[0];
1798 13b2bc37 2022-10-23 stsp 	char title[2048];
1799 13b2bc37 2022-10-23 stsp 	struct passwd *pw = NULL;
1800 13b2bc37 2022-10-23 stsp 	char *repo_path = NULL;
1801 13b2bc37 2022-10-23 stsp 	enum gotd_procid proc_id = PROC_GOTD;
1802 839338f6 2023-06-22 op 	struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1803 13b2bc37 2022-10-23 stsp 	int *pack_fds = NULL, *temp_fds = NULL;
1804 9afa3de2 2023-04-04 stsp 	struct gotd_repo *repo = NULL;
1805 13b2bc37 2022-10-23 stsp 
1806 839338f6 2023-06-22 op 	TAILQ_INIT(&procs);
1807 839338f6 2023-06-22 op 
1808 13b2bc37 2022-10-23 stsp 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1809 13b2bc37 2022-10-23 stsp 
1810 b0614828 2023-06-19 stsp 	while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1811 13b2bc37 2022-10-23 stsp 		switch (ch) {
1812 5e25db14 2022-12-29 stsp 		case 'A':
1813 5e25db14 2022-12-29 stsp 			proc_id = PROC_AUTH;
1814 5e25db14 2022-12-29 stsp 			break;
1815 13b2bc37 2022-10-23 stsp 		case 'd':
1816 13b2bc37 2022-10-23 stsp 			daemonize = 0;
1817 13b2bc37 2022-10-23 stsp 			break;
1818 13b2bc37 2022-10-23 stsp 		case 'f':
1819 13b2bc37 2022-10-23 stsp 			confpath = optarg;
1820 13b2bc37 2022-10-23 stsp 			break;
1821 d93ecf7d 2022-12-14 stsp 		case 'L':
1822 d93ecf7d 2022-12-14 stsp 			proc_id = PROC_LISTEN;
1823 d93ecf7d 2022-12-14 stsp 			break;
1824 13b2bc37 2022-10-23 stsp 		case 'n':
1825 13b2bc37 2022-10-23 stsp 			noaction = 1;
1826 13b2bc37 2022-10-23 stsp 			break;
1827 6f319063 2022-10-27 stsp 		case 'P':
1828 6f319063 2022-10-27 stsp 			repo_path = realpath(optarg, NULL);
1829 6f319063 2022-10-27 stsp 			if (repo_path == NULL)
1830 6f319063 2022-10-27 stsp 				fatal("realpath '%s'", optarg);
1831 13b2bc37 2022-10-23 stsp 			break;
1832 13b2bc37 2022-10-23 stsp 		case 'R':
1833 13b2bc37 2022-10-23 stsp 			proc_id = PROC_REPO_READ;
1834 13b2bc37 2022-10-23 stsp 			break;
1835 b0614828 2023-06-19 stsp 		case 's':
1836 b0614828 2023-06-19 stsp 			proc_id = PROC_SESSION_READ;
1837 b0614828 2023-06-19 stsp 			break;
1838 ae7c1b78 2023-01-10 stsp 		case 'S':
1839 b0614828 2023-06-19 stsp 			proc_id = PROC_SESSION_WRITE;
1840 ae7c1b78 2023-01-10 stsp 			break;
1841 6f319063 2022-10-27 stsp 		case 'v':
1842 6f319063 2022-10-27 stsp 			if (verbosity < 3)
1843 6f319063 2022-10-27 stsp 				verbosity++;
1844 6f319063 2022-10-27 stsp 			break;
1845 13b2bc37 2022-10-23 stsp 		case 'W':
1846 13b2bc37 2022-10-23 stsp 			proc_id = PROC_REPO_WRITE;
1847 13b2bc37 2022-10-23 stsp 			break;
1848 13b2bc37 2022-10-23 stsp 		default:
1849 13b2bc37 2022-10-23 stsp 			usage();
1850 13b2bc37 2022-10-23 stsp 		}
1851 13b2bc37 2022-10-23 stsp 	}
1852 13b2bc37 2022-10-23 stsp 
1853 13b2bc37 2022-10-23 stsp 	argc -= optind;
1854 13b2bc37 2022-10-23 stsp 	argv += optind;
1855 13b2bc37 2022-10-23 stsp 
1856 13b2bc37 2022-10-23 stsp 	if (argc != 0)
1857 13b2bc37 2022-10-23 stsp 		usage();
1858 b50a2b46 2022-12-29 stsp 
1859 b50a2b46 2022-12-29 stsp 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1860 13b2bc37 2022-10-23 stsp 		fatalx("need root privileges");
1861 13b2bc37 2022-10-23 stsp 
1862 4b3827cd 2023-07-08 stsp 	if (parse_config(confpath, proc_id, &gotd) != 0)
1863 13b2bc37 2022-10-23 stsp 		return 1;
1864 13b2bc37 2022-10-23 stsp 
1865 13b2bc37 2022-10-23 stsp 	pw = getpwnam(gotd.user_name);
1866 13b2bc37 2022-10-23 stsp 	if (pw == NULL)
1867 898c8f8f 2022-12-29 op 		fatalx("user %s not found", gotd.user_name);
1868 13b2bc37 2022-10-23 stsp 
1869 f4e8c21c 2023-01-17 op 	if (pw->pw_uid == 0)
1870 f4e8c21c 2023-01-17 op 		fatalx("cannot run %s as the superuser", getprogname());
1871 13b2bc37 2022-10-23 stsp 
1872 f4e8c21c 2023-01-17 op 	if (noaction) {
1873 f4e8c21c 2023-01-17 op 		fprintf(stderr, "configuration OK\n");
1874 13b2bc37 2022-10-23 stsp 		return 0;
1875 f4e8c21c 2023-01-17 op 	}
1876 13b2bc37 2022-10-23 stsp 
1877 f4e8c21c 2023-01-17 op 	gotd.argv0 = argv0;
1878 f4e8c21c 2023-01-17 op 	gotd.daemonize = daemonize;
1879 f4e8c21c 2023-01-17 op 	gotd.verbosity = verbosity;
1880 f4e8c21c 2023-01-17 op 	gotd.confpath = confpath;
1881 f4e8c21c 2023-01-17 op 
1882 f4e8c21c 2023-01-17 op 	/* Require an absolute path in argv[0] for reliable re-exec. */
1883 f4e8c21c 2023-01-17 op 	if (!got_path_is_absolute(argv0))
1884 f4e8c21c 2023-01-17 op 		fatalx("bad path \"%s\": must be an absolute path", argv0);
1885 f4e8c21c 2023-01-17 op 
1886 f4e8c21c 2023-01-17 op 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
1887 f4e8c21c 2023-01-17 op 	log_setverbose(verbosity);
1888 f4e8c21c 2023-01-17 op 
1889 b1142068 2022-12-05 stsp 	if (proc_id == PROC_GOTD) {
1890 d93ecf7d 2022-12-14 stsp 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1891 d93ecf7d 2022-12-14 stsp 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1892 d93ecf7d 2022-12-14 stsp 		if (daemonize && daemon(1, 0) == -1)
1893 d93ecf7d 2022-12-14 stsp 			fatal("daemon");
1894 f7eb3370 2023-01-23 stsp 		gotd.pid = getpid();
1895 f7eb3370 2023-01-23 stsp 		start_listener(argv0, confpath, daemonize, verbosity);
1896 d93ecf7d 2022-12-14 stsp 	} else if (proc_id == PROC_LISTEN) {
1897 d93ecf7d 2022-12-14 stsp 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1898 b1142068 2022-12-05 stsp 		if (verbosity) {
1899 b1142068 2022-12-05 stsp 			log_info("socket: %s", gotd.unix_socket_path);
1900 b1142068 2022-12-05 stsp 			log_info("user: %s", pw->pw_name);
1901 b1142068 2022-12-05 stsp 		}
1902 13b2bc37 2022-10-23 stsp 
1903 13b2bc37 2022-10-23 stsp 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1904 6f854dde 2023-01-04 stsp 		    pw->pw_gid);
1905 13b2bc37 2022-10-23 stsp 		if (fd == -1) {
1906 13b2bc37 2022-10-23 stsp 			fatal("cannot listen on unix socket %s",
1907 13b2bc37 2022-10-23 stsp 			    gotd.unix_socket_path);
1908 13b2bc37 2022-10-23 stsp 		}
1909 5e25db14 2022-12-29 stsp 	} else if (proc_id == PROC_AUTH) {
1910 5e25db14 2022-12-29 stsp 		snprintf(title, sizeof(title), "%s %s",
1911 5e25db14 2022-12-29 stsp 		    gotd_proc_names[proc_id], repo_path);
1912 ae7c1b78 2023-01-10 stsp 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1913 b0614828 2023-06-19 stsp 	    proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1914 13b2bc37 2022-10-23 stsp 		error = got_repo_pack_fds_open(&pack_fds);
1915 13b2bc37 2022-10-23 stsp 		if (error != NULL)
1916 13b2bc37 2022-10-23 stsp 			fatalx("cannot open pack tempfiles: %s", error->msg);
1917 13b2bc37 2022-10-23 stsp 		error = got_repo_temp_fds_open(&temp_fds);
1918 13b2bc37 2022-10-23 stsp 		if (error != NULL)
1919 13b2bc37 2022-10-23 stsp 			fatalx("cannot open pack tempfiles: %s", error->msg);
1920 13b2bc37 2022-10-23 stsp 		if (repo_path == NULL)
1921 13b2bc37 2022-10-23 stsp 			fatalx("repository path not specified");
1922 13b2bc37 2022-10-23 stsp 		snprintf(title, sizeof(title), "%s %s",
1923 13b2bc37 2022-10-23 stsp 		    gotd_proc_names[proc_id], repo_path);
1924 13b2bc37 2022-10-23 stsp 	} else
1925 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
1926 13b2bc37 2022-10-23 stsp 
1927 13b2bc37 2022-10-23 stsp 	setproctitle("%s", title);
1928 13b2bc37 2022-10-23 stsp 	log_procinit(title);
1929 13b2bc37 2022-10-23 stsp 
1930 13b2bc37 2022-10-23 stsp 	/* Drop root privileges. */
1931 13b2bc37 2022-10-23 stsp 	if (setgid(pw->pw_gid) == -1)
1932 13b2bc37 2022-10-23 stsp 		fatal("setgid %d failed", pw->pw_gid);
1933 13b2bc37 2022-10-23 stsp 	if (setuid(pw->pw_uid) == -1)
1934 13b2bc37 2022-10-23 stsp 		fatal("setuid %d failed", pw->pw_uid);
1935 13b2bc37 2022-10-23 stsp 
1936 13b2bc37 2022-10-23 stsp 	event_init();
1937 13b2bc37 2022-10-23 stsp 
1938 13b2bc37 2022-10-23 stsp 	switch (proc_id) {
1939 13b2bc37 2022-10-23 stsp 	case PROC_GOTD:
1940 13b2bc37 2022-10-23 stsp #ifndef PROFILE
1941 ae7c1b78 2023-01-10 stsp 		/* "exec" promise will be limited to argv[0] via unveil(2). */
1942 ae7c1b78 2023-01-10 stsp 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1943 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
1944 13b2bc37 2022-10-23 stsp #endif
1945 13b2bc37 2022-10-23 stsp 		break;
1946 d93ecf7d 2022-12-14 stsp 	case PROC_LISTEN:
1947 d93ecf7d 2022-12-14 stsp #ifndef PROFILE
1948 77f619a8 2023-01-04 stsp 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
1949 d93ecf7d 2022-12-14 stsp 			err(1, "pledge");
1950 d93ecf7d 2022-12-14 stsp #endif
1951 77f619a8 2023-01-04 stsp 		/*
1952 77f619a8 2023-01-04 stsp 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
1953 77f619a8 2023-01-04 stsp 		 * sockets by revoking all filesystem access via unveil(2).
1954 77f619a8 2023-01-04 stsp 		 */
1955 77f619a8 2023-01-04 stsp 		apply_unveil_none();
1956 77f619a8 2023-01-04 stsp 
1957 40b85cca 2023-01-03 stsp 		listen_main(title, fd, gotd.connection_limits,
1958 40b85cca 2023-01-03 stsp 		    gotd.nconnection_limits);
1959 d93ecf7d 2022-12-14 stsp 		/* NOTREACHED */
1960 d93ecf7d 2022-12-14 stsp 		break;
1961 5e25db14 2022-12-29 stsp 	case PROC_AUTH:
1962 5e25db14 2022-12-29 stsp #ifndef PROFILE
1963 44587340 2022-12-30 stsp 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1964 5e25db14 2022-12-29 stsp 			err(1, "pledge");
1965 5e25db14 2022-12-29 stsp #endif
1966 44587340 2022-12-30 stsp 		/*
1967 44587340 2022-12-30 stsp 		 * We need the "unix" pledge promise for getpeername(2) only.
1968 44587340 2022-12-30 stsp 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
1969 44587340 2022-12-30 stsp 		 * filesystem access via unveil(2). Access to password database
1970 44587340 2022-12-30 stsp 		 * files will still work since "getpw" bypasses unveil(2).
1971 44587340 2022-12-30 stsp 		 */
1972 44587340 2022-12-30 stsp 		apply_unveil_none();
1973 44587340 2022-12-30 stsp 
1974 5e25db14 2022-12-29 stsp 		auth_main(title, &gotd.repos, repo_path);
1975 5e25db14 2022-12-29 stsp 		/* NOTREACHED */
1976 5e25db14 2022-12-29 stsp 		break;
1977 b0614828 2023-06-19 stsp 	case PROC_SESSION_READ:
1978 b0614828 2023-06-19 stsp 	case PROC_SESSION_WRITE:
1979 ae7c1b78 2023-01-10 stsp #ifndef PROFILE
1980 ae7c1b78 2023-01-10 stsp 		/*
1981 ae7c1b78 2023-01-10 stsp 		 * The "recvfd" promise is only needed during setup and
1982 ae7c1b78 2023-01-10 stsp 		 * will be removed in a later pledge(2) call.
1983 ae7c1b78 2023-01-10 stsp 		 */
1984 ae7c1b78 2023-01-10 stsp 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
1985 ae7c1b78 2023-01-10 stsp 		    "unveil", NULL) == -1)
1986 ae7c1b78 2023-01-10 stsp 			err(1, "pledge");
1987 ae7c1b78 2023-01-10 stsp #endif
1988 b0614828 2023-06-19 stsp 		if (proc_id == PROC_SESSION_READ)
1989 b0614828 2023-06-19 stsp 			apply_unveil_repo_readonly(repo_path, 1);
1990 b0614828 2023-06-19 stsp 		else
1991 b0614828 2023-06-19 stsp 			apply_unveil_repo_readwrite(repo_path);
1992 ae7c1b78 2023-01-10 stsp 		session_main(title, repo_path, pack_fds, temp_fds,
1993 b0614828 2023-06-19 stsp 		    &gotd.request_timeout, proc_id);
1994 ae7c1b78 2023-01-10 stsp 		/* NOTREACHED */
1995 ae7c1b78 2023-01-10 stsp 		break;
1996 13b2bc37 2022-10-23 stsp 	case PROC_REPO_READ:
1997 13b2bc37 2022-10-23 stsp #ifndef PROFILE
1998 eec68231 2022-12-14 stsp 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
1999 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
2000 13b2bc37 2022-10-23 stsp #endif
2001 b0614828 2023-06-19 stsp 		apply_unveil_repo_readonly(repo_path, 0);
2002 eec68231 2022-12-14 stsp 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2003 13b2bc37 2022-10-23 stsp 		/* NOTREACHED */
2004 13b2bc37 2022-10-23 stsp 		exit(0);
2005 13b2bc37 2022-10-23 stsp 	case PROC_REPO_WRITE:
2006 13b2bc37 2022-10-23 stsp #ifndef PROFILE
2007 eec68231 2022-12-14 stsp 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2008 13b2bc37 2022-10-23 stsp 			err(1, "pledge");
2009 13b2bc37 2022-10-23 stsp #endif
2010 b0614828 2023-06-19 stsp 		apply_unveil_repo_readonly(repo_path, 0);
2011 9afa3de2 2023-04-04 stsp 		repo = gotd_find_repo_by_path(repo_path, &gotd);
2012 9afa3de2 2023-04-04 stsp 		if (repo == NULL)
2013 9afa3de2 2023-04-04 stsp 			fatalx("no repository for path %s", repo_path);
2014 9afa3de2 2023-04-04 stsp 		repo_write_main(title, repo_path, pack_fds, temp_fds,
2015 9afa3de2 2023-04-04 stsp 		    &repo->protected_tag_namespaces,
2016 9afa3de2 2023-04-04 stsp 		    &repo->protected_branch_namespaces,
2017 9afa3de2 2023-04-04 stsp 		    &repo->protected_branches);
2018 13b2bc37 2022-10-23 stsp 		/* NOTREACHED */
2019 13b2bc37 2022-10-23 stsp 		exit(0);
2020 13b2bc37 2022-10-23 stsp 	default:
2021 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
2022 13b2bc37 2022-10-23 stsp 	}
2023 13b2bc37 2022-10-23 stsp 
2024 13b2bc37 2022-10-23 stsp 	if (proc_id != PROC_GOTD)
2025 13b2bc37 2022-10-23 stsp 		fatal("invalid process id %d", proc_id);
2026 13b2bc37 2022-10-23 stsp 
2027 839338f6 2023-06-22 op 	evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2028 839338f6 2023-06-22 op 	    gotd.listen_proc);
2029 839338f6 2023-06-22 op 
2030 ae7c1b78 2023-01-10 stsp 	apply_unveil_selfexec();
2031 13b2bc37 2022-10-23 stsp 
2032 13b2bc37 2022-10-23 stsp 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2033 13b2bc37 2022-10-23 stsp 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2034 13b2bc37 2022-10-23 stsp 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2035 13b2bc37 2022-10-23 stsp 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2036 839338f6 2023-06-22 op 	signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2037 13b2bc37 2022-10-23 stsp 	signal(SIGPIPE, SIG_IGN);
2038 13b2bc37 2022-10-23 stsp 
2039 13b2bc37 2022-10-23 stsp 	signal_add(&evsigint, NULL);
2040 13b2bc37 2022-10-23 stsp 	signal_add(&evsigterm, NULL);
2041 13b2bc37 2022-10-23 stsp 	signal_add(&evsighup, NULL);
2042 13b2bc37 2022-10-23 stsp 	signal_add(&evsigusr1, NULL);
2043 839338f6 2023-06-22 op 	signal_add(&evsigchld, NULL);
2044 13b2bc37 2022-10-23 stsp 
2045 c929736a 2023-06-22 op 	gotd_imsg_event_add(&gotd.listen_proc->iev);
2046 13b2bc37 2022-10-23 stsp 
2047 13b2bc37 2022-10-23 stsp 	event_dispatch();
2048 13b2bc37 2022-10-23 stsp 
2049 13b2bc37 2022-10-23 stsp 	free(repo_path);
2050 ae7c1b78 2023-01-10 stsp 	gotd_shutdown();
2051 ae7c1b78 2023-01-10 stsp 
2052 13b2bc37 2022-10-23 stsp 	return 0;
2053 13b2bc37 2022-10-23 stsp }