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introduce gotd(8), a Git repository server reachable via ssh(1) This is an initial barebones implementation which provides the absolute minimum of functionality required to serve got(1) and git(1) clients. Basic fetch/send functionality has been tested and seems to work here, but this server is not yet expected to be stable. More testing is welcome. See the man pages for setup instructions. The current design uses one reader and one writer process per repository, which will have to be extended to N readers and N writers in the future. At startup, each process will chroot(2) into its assigned repository. This works because gotd(8) can only be started as root, and will then fork+exec, chroot, and privdrop. At present the parent process runs with the following pledge(2) promises: "stdio rpath wpath cpath proc getpw sendfd recvfd fattr flock unix unveil" The parent is the only process able to modify the repository in a way that becomes visible to Git clients. The parent uses unveil(2) to restrict its view of the filesystem to /tmp and the repositories listed in the configuration file gotd.conf(5). Per-repository chroot(2) processes use "stdio rpath sendfd recvfd". The writer defers to the parent for modifying references in the repository to point at newly uploaded commits. The reader is fine without such help, because Git repositories can be read without having to create any lock-files. gotd(8) requires a dedicated user ID, which should own repositories on the filesystem, and a separate secondary group, which should not have filesystem-level repository access, and must be allowed access to the gotd(8) socket. To obtain Git repository access, users must be members of this secondary group, and must have their login shell set to gotsh(1). gotsh(1) connects to the gotd(8) socket and speaks Git-protocol towards the client on the other end of the SSH connection. gotsh(1) is not an interactive command shell. At present, authenticated clients are granted read/write access to all repositories and all references (except for the "refs/got/" and the "refs/remotes/" namespaces, which are already being protected from modification). While complicated access control mechanism are not a design goal, making it possible to safely offer anonymous Git repository access over ssh(1) is on the road map.
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  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 

 20 13b2bc37 2022-10-23 stsp #include <errno.h>

 21 13b2bc37 2022-10-23 stsp #include <event.h>

 22 13b2bc37 2022-10-23 stsp #include <fcntl.h>

 23 13b2bc37 2022-10-23 stsp #include <imsg.h>

 24 13b2bc37 2022-10-23 stsp #include <sha1.h>

 25 13b2bc37 2022-10-23 stsp #include <stdio.h>

 26 13b2bc37 2022-10-23 stsp #include <stdlib.h>

 27 13b2bc37 2022-10-23 stsp #include <string.h>

 28 13b2bc37 2022-10-23 stsp #include <limits.h>

 29 13b2bc37 2022-10-23 stsp #include <unistd.h>

 30 13b2bc37 2022-10-23 stsp 

 31 13b2bc37 2022-10-23 stsp #include "got_error.h"

 32 13b2bc37 2022-10-23 stsp #include "got_object.h"

 33 13b2bc37 2022-10-23 stsp #include "got_repository.h"

 34 13b2bc37 2022-10-23 stsp #include "got_path.h"

 35 13b2bc37 2022-10-23 stsp 

 36 13b2bc37 2022-10-23 stsp #include "got_lib_gitconfig.h"

 37 13b2bc37 2022-10-23 stsp #include "got_lib_delta.h"

 38 13b2bc37 2022-10-23 stsp #include "got_lib_object.h"

 39 13b2bc37 2022-10-23 stsp #include "got_lib_object_cache.h"

 40 13b2bc37 2022-10-23 stsp #include "got_lib_privsep.h"

 41 13b2bc37 2022-10-23 stsp #include "got_lib_pack.h"

 42 13b2bc37 2022-10-23 stsp #include "got_lib_repository.h"

 43 13b2bc37 2022-10-23 stsp 

 44 13b2bc37 2022-10-23 stsp static int

 45 13b2bc37 2022-10-23 stsp get_boolean_val(char *val)

 46 13b2bc37 2022-10-23 stsp {

 47 13b2bc37 2022-10-23 stsp     return (strcasecmp(val, "true") == 0 ||

 48 13b2bc37 2022-10-23 stsp 	strcasecmp(val, "on") == 0 ||

 49 13b2bc37 2022-10-23 stsp 	strcasecmp(val, "yes") == 0 ||

 50 13b2bc37 2022-10-23 stsp 	strcmp(val, "1") == 0);

 51 13b2bc37 2022-10-23 stsp }

 52 13b2bc37 2022-10-23 stsp 

 53 13b2bc37 2022-10-23 stsp const struct got_error *

 54 13b2bc37 2022-10-23 stsp got_repo_read_gitconfig(int *gitconfig_repository_format_version,

 55 13b2bc37 2022-10-23 stsp     char **gitconfig_author_name, char **gitconfig_author_email,

 56 13b2bc37 2022-10-23 stsp     struct got_remote_repo **remotes, int *nremotes,

 57 13b2bc37 2022-10-23 stsp     char **gitconfig_owner, char ***extensions, int *nextensions,

 58 13b2bc37 2022-10-23 stsp     const char *gitconfig_path)

 59 13b2bc37 2022-10-23 stsp {

 60 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;

 61 13b2bc37 2022-10-23 stsp 	struct got_gitconfig *gitconfig = NULL;

 62 13b2bc37 2022-10-23 stsp 	struct got_gitconfig_list *tags;

 63 13b2bc37 2022-10-23 stsp 	struct got_gitconfig_list_node *node;

 64 13b2bc37 2022-10-23 stsp 	int fd, i;

 65 13b2bc37 2022-10-23 stsp 	const char *author, *email, *owner;

 66 13b2bc37 2022-10-23 stsp 

 67 13b2bc37 2022-10-23 stsp 	*gitconfig_repository_format_version = 0;

 68 13b2bc37 2022-10-23 stsp 	if (extensions)

 69 13b2bc37 2022-10-23 stsp 		*extensions = NULL;

 70 13b2bc37 2022-10-23 stsp 	if (nextensions)

 71 13b2bc37 2022-10-23 stsp 		*nextensions = 0;

 72 13b2bc37 2022-10-23 stsp 	*gitconfig_author_name = NULL;

 73 13b2bc37 2022-10-23 stsp 	*gitconfig_author_email = NULL;

 74 13b2bc37 2022-10-23 stsp 	if (remotes)

 75 13b2bc37 2022-10-23 stsp 		*remotes = NULL;

 76 13b2bc37 2022-10-23 stsp 	if (nremotes)

 77 13b2bc37 2022-10-23 stsp 		*nremotes = 0;

 78 13b2bc37 2022-10-23 stsp 	if (gitconfig_owner)

 79 13b2bc37 2022-10-23 stsp 		*gitconfig_owner = NULL;

 80 13b2bc37 2022-10-23 stsp 

 81 13b2bc37 2022-10-23 stsp 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);

 82 13b2bc37 2022-10-23 stsp 	if (fd == -1) {

 83 13b2bc37 2022-10-23 stsp 		if (errno == ENOENT)

 84 13b2bc37 2022-10-23 stsp 			return NULL;

 85 13b2bc37 2022-10-23 stsp 		return got_error_from_errno2("open", gitconfig_path);

 86 13b2bc37 2022-10-23 stsp 	}

 87 13b2bc37 2022-10-23 stsp 

 88 13b2bc37 2022-10-23 stsp 	err = got_gitconfig_open(&gitconfig, fd);

 89 13b2bc37 2022-10-23 stsp 	if (err)

 90 13b2bc37 2022-10-23 stsp 		goto done;

 91 13b2bc37 2022-10-23 stsp 

 92 13b2bc37 2022-10-23 stsp 	*gitconfig_repository_format_version = got_gitconfig_get_num(gitconfig,

 93 13b2bc37 2022-10-23 stsp 	    "core", "repositoryformatversion", 0);

 94 13b2bc37 2022-10-23 stsp 

 95 13b2bc37 2022-10-23 stsp 	tags = got_gitconfig_get_tag_list(gitconfig, "extensions");

 96 13b2bc37 2022-10-23 stsp 	if (extensions && nextensions && tags) {

 97 13b2bc37 2022-10-23 stsp 		size_t numext = 0;

 98 13b2bc37 2022-10-23 stsp 		TAILQ_FOREACH(node, &tags->fields, link) {

 99 13b2bc37 2022-10-23 stsp 			char *ext = node->field;

100 13b2bc37 2022-10-23 stsp 			char *val = got_gitconfig_get_str(gitconfig,

101 13b2bc37 2022-10-23 stsp 			    "extensions", ext);

102 13b2bc37 2022-10-23 stsp 			if (get_boolean_val(val))

103 13b2bc37 2022-10-23 stsp 				numext++;

104 13b2bc37 2022-10-23 stsp 		}

105 13b2bc37 2022-10-23 stsp 		*extensions = calloc(numext, sizeof(char *));

106 13b2bc37 2022-10-23 stsp 		if (*extensions == NULL) {

107 13b2bc37 2022-10-23 stsp 			err = got_error_from_errno("calloc");

108 13b2bc37 2022-10-23 stsp 			goto done;

109 13b2bc37 2022-10-23 stsp 		}

110 13b2bc37 2022-10-23 stsp 		TAILQ_FOREACH(node, &tags->fields, link) {

111 13b2bc37 2022-10-23 stsp 			char *ext = node->field;

112 13b2bc37 2022-10-23 stsp 			char *val = got_gitconfig_get_str(gitconfig,

113 13b2bc37 2022-10-23 stsp 			    "extensions", ext);

114 13b2bc37 2022-10-23 stsp 			if (get_boolean_val(val)) {

115 13b2bc37 2022-10-23 stsp 				char *extstr = strdup(ext);

116 13b2bc37 2022-10-23 stsp 				if (extstr == NULL) {

117 13b2bc37 2022-10-23 stsp 					err = got_error_from_errno("strdup");

118 13b2bc37 2022-10-23 stsp 					goto done;

119 13b2bc37 2022-10-23 stsp 				}

120 13b2bc37 2022-10-23 stsp 				(*extensions)[(*nextensions)] = extstr;

121 13b2bc37 2022-10-23 stsp 				(*nextensions)++;

122 13b2bc37 2022-10-23 stsp 			}

123 13b2bc37 2022-10-23 stsp 		}

124 13b2bc37 2022-10-23 stsp 	}

125 13b2bc37 2022-10-23 stsp 

126 13b2bc37 2022-10-23 stsp 	author = got_gitconfig_get_str(gitconfig, "user", "name");

127 13b2bc37 2022-10-23 stsp 	if (author) {

128 13b2bc37 2022-10-23 stsp 		*gitconfig_author_name = strdup(author);

129 13b2bc37 2022-10-23 stsp 		if (*gitconfig_author_name == NULL) {

130 13b2bc37 2022-10-23 stsp 			err = got_error_from_errno("strdup");

131 13b2bc37 2022-10-23 stsp 			goto done;

132 13b2bc37 2022-10-23 stsp 		}

133 13b2bc37 2022-10-23 stsp 	}

134 13b2bc37 2022-10-23 stsp 

135 13b2bc37 2022-10-23 stsp 	email = got_gitconfig_get_str(gitconfig, "user", "email");

136 13b2bc37 2022-10-23 stsp 	if (email) {

137 13b2bc37 2022-10-23 stsp 		*gitconfig_author_email = strdup(email);

138 13b2bc37 2022-10-23 stsp 		if (*gitconfig_author_email == NULL) {

139 13b2bc37 2022-10-23 stsp 			err = got_error_from_errno("strdup");

140 13b2bc37 2022-10-23 stsp 			goto done;

141 13b2bc37 2022-10-23 stsp 		}

142 13b2bc37 2022-10-23 stsp 	}

143 13b2bc37 2022-10-23 stsp 

144 13b2bc37 2022-10-23 stsp 	if (gitconfig_owner) {

145 13b2bc37 2022-10-23 stsp 		owner = got_gitconfig_get_str(gitconfig, "gotweb", "owner");

146 13b2bc37 2022-10-23 stsp 		if (owner == NULL)

147 13b2bc37 2022-10-23 stsp 			owner = got_gitconfig_get_str(gitconfig, "gitweb",

148 13b2bc37 2022-10-23 stsp 			    "owner");

149 13b2bc37 2022-10-23 stsp 		if (owner) {

150 13b2bc37 2022-10-23 stsp 			*gitconfig_owner = strdup(owner);

151 13b2bc37 2022-10-23 stsp 			if (*gitconfig_owner == NULL) {

152 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("strdup");

153 13b2bc37 2022-10-23 stsp 				goto done;

154 13b2bc37 2022-10-23 stsp 			}

155 13b2bc37 2022-10-23 stsp 

156 13b2bc37 2022-10-23 stsp 		}

157 13b2bc37 2022-10-23 stsp 	}

158 13b2bc37 2022-10-23 stsp 

159 13b2bc37 2022-10-23 stsp 	if (remotes && nremotes) {

160 13b2bc37 2022-10-23 stsp 		struct got_gitconfig_list *sections;

161 13b2bc37 2022-10-23 stsp 		size_t nalloc = 0;

162 13b2bc37 2022-10-23 stsp 		err = got_gitconfig_get_section_list(&sections, gitconfig);

163 13b2bc37 2022-10-23 stsp 		if (err)

164 13b2bc37 2022-10-23 stsp 			return err;

165 13b2bc37 2022-10-23 stsp 		TAILQ_FOREACH(node, &sections->fields, link) {

166 13b2bc37 2022-10-23 stsp 			if (strncasecmp("remote \"", node->field, 8) != 0)

167 13b2bc37 2022-10-23 stsp 				continue;

168 13b2bc37 2022-10-23 stsp 			nalloc++;

169 13b2bc37 2022-10-23 stsp 		}

170 13b2bc37 2022-10-23 stsp 

171 13b2bc37 2022-10-23 stsp 		*remotes = recallocarray(NULL, 0, nalloc, sizeof(**remotes));

172 13b2bc37 2022-10-23 stsp 		if (*remotes == NULL) {

173 13b2bc37 2022-10-23 stsp 			err = got_error_from_errno("recallocarray");

174 13b2bc37 2022-10-23 stsp 			goto done;

175 13b2bc37 2022-10-23 stsp 		}

176 13b2bc37 2022-10-23 stsp 

177 13b2bc37 2022-10-23 stsp 		i = 0;

178 13b2bc37 2022-10-23 stsp 		TAILQ_FOREACH(node, &sections->fields, link) {

179 13b2bc37 2022-10-23 stsp 			struct got_remote_repo *remote;

180 13b2bc37 2022-10-23 stsp 			char *name, *end, *mirror;

181 13b2bc37 2022-10-23 stsp 			const char *fetch_url, *send_url;

182 13b2bc37 2022-10-23 stsp 

183 13b2bc37 2022-10-23 stsp 			if (strncasecmp("remote \"", node->field, 8) != 0)

184 13b2bc37 2022-10-23 stsp 				continue;

185 13b2bc37 2022-10-23 stsp 

186 13b2bc37 2022-10-23 stsp 			remote = &(*remotes)[i];

187 13b2bc37 2022-10-23 stsp 

188 13b2bc37 2022-10-23 stsp 			name = strdup(node->field + 8);

189 13b2bc37 2022-10-23 stsp 			if (name == NULL) {

190 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("strdup");

191 13b2bc37 2022-10-23 stsp 				goto done;

192 13b2bc37 2022-10-23 stsp 			}

193 13b2bc37 2022-10-23 stsp 			end = strrchr(name, '"');

194 13b2bc37 2022-10-23 stsp 			if (end)

195 13b2bc37 2022-10-23 stsp 				*end = '\0';

196 13b2bc37 2022-10-23 stsp 			remote->name = name;

197 13b2bc37 2022-10-23 stsp 

198 13b2bc37 2022-10-23 stsp 			fetch_url = got_gitconfig_get_str(gitconfig,

199 13b2bc37 2022-10-23 stsp 			    node->field, "url");

200 13b2bc37 2022-10-23 stsp 			if (fetch_url == NULL) {

201 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);

202 13b2bc37 2022-10-23 stsp 				free(remote->name);

203 13b2bc37 2022-10-23 stsp 				remote->name = NULL;

204 13b2bc37 2022-10-23 stsp 				goto done;

205 13b2bc37 2022-10-23 stsp 			}

206 13b2bc37 2022-10-23 stsp 			remote->fetch_url = strdup(fetch_url);

207 13b2bc37 2022-10-23 stsp 			if (remote->fetch_url == NULL) {

208 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("strdup");

209 13b2bc37 2022-10-23 stsp 				free(remote->name);

210 13b2bc37 2022-10-23 stsp 				remote->name = NULL;

211 13b2bc37 2022-10-23 stsp 				goto done;

212 13b2bc37 2022-10-23 stsp 			}

213 13b2bc37 2022-10-23 stsp 

214 13b2bc37 2022-10-23 stsp 			send_url = got_gitconfig_get_str(gitconfig,

215 13b2bc37 2022-10-23 stsp 			    node->field, "pushurl");

216 13b2bc37 2022-10-23 stsp 			if (send_url == NULL)

217 13b2bc37 2022-10-23 stsp 				send_url = got_gitconfig_get_str(gitconfig,

218 13b2bc37 2022-10-23 stsp 				    node->field, "url");

219 13b2bc37 2022-10-23 stsp 			if (send_url == NULL) {

220 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_GITCONFIG_SYNTAX);

221 13b2bc37 2022-10-23 stsp 				free(remote->name);

222 13b2bc37 2022-10-23 stsp 				remote->name = NULL;

223 13b2bc37 2022-10-23 stsp 				free(remote->fetch_url);

224 13b2bc37 2022-10-23 stsp 				remote->fetch_url = NULL;

225 13b2bc37 2022-10-23 stsp 				goto done;

226 13b2bc37 2022-10-23 stsp 			}

227 13b2bc37 2022-10-23 stsp 			remote->send_url = strdup(send_url);

228 13b2bc37 2022-10-23 stsp 			if (remote->send_url == NULL) {

229 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("strdup");

230 13b2bc37 2022-10-23 stsp 				free(remote->name);

231 13b2bc37 2022-10-23 stsp 				remote->name = NULL;

232 13b2bc37 2022-10-23 stsp 				free(remote->fetch_url);

233 13b2bc37 2022-10-23 stsp 				remote->fetch_url = NULL;

234 13b2bc37 2022-10-23 stsp 				goto done;

235 13b2bc37 2022-10-23 stsp 			}

236 13b2bc37 2022-10-23 stsp 

237 13b2bc37 2022-10-23 stsp 			remote->mirror_references = 0;

238 13b2bc37 2022-10-23 stsp 			mirror = got_gitconfig_get_str(gitconfig, node->field,

239 13b2bc37 2022-10-23 stsp 			    "mirror");

240 13b2bc37 2022-10-23 stsp 			if (mirror != NULL && get_boolean_val(mirror))

241 13b2bc37 2022-10-23 stsp 				remote->mirror_references = 1;

242 13b2bc37 2022-10-23 stsp 

243 13b2bc37 2022-10-23 stsp 			i++;

244 13b2bc37 2022-10-23 stsp 			(*nremotes)++;

245 13b2bc37 2022-10-23 stsp 		}

246 13b2bc37 2022-10-23 stsp 	}

247 13b2bc37 2022-10-23 stsp done:

248 13b2bc37 2022-10-23 stsp 	if (fd != -1)

249 13b2bc37 2022-10-23 stsp 		close(fd);

250 13b2bc37 2022-10-23 stsp 	if (gitconfig)

251 13b2bc37 2022-10-23 stsp 		got_gitconfig_close(gitconfig);

252 13b2bc37 2022-10-23 stsp 	if (err) {

253 13b2bc37 2022-10-23 stsp 		if (extensions && nextensions) {

254 13b2bc37 2022-10-23 stsp 			for (i = 0; i < (*nextensions); i++)

255 13b2bc37 2022-10-23 stsp 				free((*extensions)[i]);

256 13b2bc37 2022-10-23 stsp 			free(*extensions);

257 13b2bc37 2022-10-23 stsp 			*extensions = NULL;

258 13b2bc37 2022-10-23 stsp 			*nextensions = 0;

259 13b2bc37 2022-10-23 stsp 		}

260 13b2bc37 2022-10-23 stsp 		if (remotes && nremotes) {

261 13b2bc37 2022-10-23 stsp 			for (i = 0; i < (*nremotes); i++) {

262 13b2bc37 2022-10-23 stsp 				struct got_remote_repo *remote;

263 13b2bc37 2022-10-23 stsp 				remote = &(*remotes)[i];

264 13b2bc37 2022-10-23 stsp 				free(remote->name);

265 13b2bc37 2022-10-23 stsp 				free(remote->fetch_url);

266 13b2bc37 2022-10-23 stsp 				free(remote->send_url);

267 13b2bc37 2022-10-23 stsp 			}

268 13b2bc37 2022-10-23 stsp 			free(*remotes);

269 13b2bc37 2022-10-23 stsp 			*remotes = NULL;

270 13b2bc37 2022-10-23 stsp 			*nremotes = 0;

271 13b2bc37 2022-10-23 stsp 		}

272 13b2bc37 2022-10-23 stsp 	}

273 13b2bc37 2022-10-23 stsp 	return err;

274 13b2bc37 2022-10-23 stsp }