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avoid gitwrapper printing a warning when /etc/gotd.conf does not exist gotd still requires the config file, of course, but gitwrapper must treat is as optional and remain silent if the file cannot be found.
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  1 b09c1279 2023-03-28 stsp /*

  2 b09c1279 2023-03-28 stsp  * Copyright (c) 2023 Stefan Sperling <stsp@openbsd.org>

  3 b09c1279 2023-03-28 stsp  *

  4 b09c1279 2023-03-28 stsp  * Permission to use, copy, modify, and distribute this software for any

  5 b09c1279 2023-03-28 stsp  * purpose with or without fee is hereby granted, provided that the above

  6 b09c1279 2023-03-28 stsp  * copyright notice and this permission notice appear in all copies.

  7 b09c1279 2023-03-28 stsp  *

  8 b09c1279 2023-03-28 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

  9 b09c1279 2023-03-28 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 10 b09c1279 2023-03-28 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 11 b09c1279 2023-03-28 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 12 b09c1279 2023-03-28 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 13 b09c1279 2023-03-28 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 14 b09c1279 2023-03-28 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 15 b09c1279 2023-03-28 stsp  */

 16 b09c1279 2023-03-28 stsp 

 17 b09c1279 2023-03-28 stsp /*

 18 b09c1279 2023-03-28 stsp  * Resolve path namespace conflicts for git-upload-pack and git-receive-pack.

 19 b09c1279 2023-03-28 stsp  */

 20 b09c1279 2023-03-28 stsp 

 21 b09c1279 2023-03-28 stsp #include <sys/queue.h>

 22 b09c1279 2023-03-28 stsp #include <sys/types.h>

 23 b09c1279 2023-03-28 stsp #include <sys/uio.h>

 24 b09c1279 2023-03-28 stsp 

 25 b09c1279 2023-03-28 stsp #include <err.h>

 26 b09c1279 2023-03-28 stsp #include <errno.h>

 27 b09c1279 2023-03-28 stsp #include <event.h>

 28 b09c1279 2023-03-28 stsp #include <imsg.h>

 29 b09c1279 2023-03-28 stsp #include <limits.h>

 30 b09c1279 2023-03-28 stsp #include <stdio.h>

 31 b09c1279 2023-03-28 stsp #include <stdlib.h>

 32 b09c1279 2023-03-28 stsp #include <string.h>

 33 b09c1279 2023-03-28 stsp #include <sha1.h>

 34 b09c1279 2023-03-28 stsp #include <sha2.h>

 35 b09c1279 2023-03-28 stsp #include <syslog.h>

 36 b09c1279 2023-03-28 stsp #include <util.h>

 37 b09c1279 2023-03-28 stsp #include <unistd.h>

 38 b09c1279 2023-03-28 stsp 

 39 b09c1279 2023-03-28 stsp #include "got_error.h"

 40 b09c1279 2023-03-28 stsp #include "got_path.h"

 41 b09c1279 2023-03-28 stsp #include "got_serve.h"

 42 b09c1279 2023-03-28 stsp 

 43 b09c1279 2023-03-28 stsp #include "gotd.h"

 44 b09c1279 2023-03-28 stsp #include "log.h"

 45 b09c1279 2023-03-28 stsp 

 46 b09c1279 2023-03-28 stsp #ifndef GITWRAPPER_GIT_LIBEXEC_DIR

 47 b09c1279 2023-03-28 stsp #define GITWRAPPER_GIT_LIBEXEC_DIR "/usr/local/libexec/git"

 48 b09c1279 2023-03-28 stsp #endif

 49 b09c1279 2023-03-28 stsp 

 50 b09c1279 2023-03-28 stsp #ifndef GITWRAPPER_MY_SERVER_PROG

 51 b09c1279 2023-03-28 stsp #define GITWRAPPER_MY_SERVER_PROG "gotsh"

 52 b09c1279 2023-03-28 stsp #endif

 53 b09c1279 2023-03-28 stsp 

 54 b09c1279 2023-03-28 stsp 

 55 b09c1279 2023-03-28 stsp __dead static void

 56 b09c1279 2023-03-28 stsp usage(void)

 57 b09c1279 2023-03-28 stsp {

 58 b09c1279 2023-03-28 stsp 	fprintf(stderr, "usage: %s -c '%s|%s repository-path'\n",

 59 b09c1279 2023-03-28 stsp 	    getprogname(), GOT_SERVE_CMD_SEND, GOT_SERVE_CMD_FETCH);

 60 b09c1279 2023-03-28 stsp 	exit(1);

 61 b09c1279 2023-03-28 stsp }

 62 b09c1279 2023-03-28 stsp 

 63 b09c1279 2023-03-28 stsp /*

 64 b09c1279 2023-03-28 stsp  * Unveil the specific programs we want to start and hide everything else.

 65 b09c1279 2023-03-28 stsp  * This is important to limit the impact of our "exec" pledge.

 66 b09c1279 2023-03-28 stsp  */

 67 b09c1279 2023-03-28 stsp static const struct got_error *

 68 b09c1279 2023-03-28 stsp apply_unveil(const char *myserver)

 69 b09c1279 2023-03-28 stsp {

 70 b09c1279 2023-03-28 stsp 	const char *fetchcmd = GITWRAPPER_GIT_LIBEXEC_DIR "/" \

 71 b09c1279 2023-03-28 stsp 		GOT_SERVE_CMD_FETCH;

 72 b09c1279 2023-03-28 stsp 	const char *sendcmd = GITWRAPPER_GIT_LIBEXEC_DIR "/" \

 73 b09c1279 2023-03-28 stsp 		GOT_SERVE_CMD_SEND;

 74 b09c1279 2023-03-28 stsp 

 75 b09c1279 2023-03-28 stsp #ifdef PROFILE

 76 b09c1279 2023-03-28 stsp 	if (unveil("gmon.out", "rwc") != 0)

 77 b09c1279 2023-03-28 stsp 		return got_error_from_errno2("unveil", "gmon.out");

 78 b09c1279 2023-03-28 stsp #endif

 79 b09c1279 2023-03-28 stsp 	if (unveil(fetchcmd, "x") != 0)

 80 b09c1279 2023-03-28 stsp 		return got_error_from_errno2("unveil", fetchcmd);

 81 b09c1279 2023-03-28 stsp 

 82 b09c1279 2023-03-28 stsp 	if (unveil(sendcmd, "x") != 0)

 83 b09c1279 2023-03-28 stsp 		return got_error_from_errno2("unveil", sendcmd);

 84 b09c1279 2023-03-28 stsp 

 85 b09c1279 2023-03-28 stsp 	if (myserver && unveil(myserver, "x") != 0)

 86 b09c1279 2023-03-28 stsp 		return got_error_from_errno2("unveil", myserver);

 87 b09c1279 2023-03-28 stsp 

 88 b09c1279 2023-03-28 stsp 	if (unveil(NULL, NULL) != 0)

 89 b09c1279 2023-03-28 stsp 		return got_error_from_errno("unveil");

 90 b09c1279 2023-03-28 stsp 

 91 b09c1279 2023-03-28 stsp 	return NULL;

 92 b09c1279 2023-03-28 stsp }

 93 b09c1279 2023-03-28 stsp 

 94 b09c1279 2023-03-28 stsp int

 95 b09c1279 2023-03-28 stsp main(int argc, char *argv[])

 96 b09c1279 2023-03-28 stsp {

 97 b09c1279 2023-03-28 stsp 	const struct got_error *error;

 98 b09c1279 2023-03-28 stsp 	const char *confpath = NULL;

 99 b09c1279 2023-03-28 stsp 	char *command = NULL, *repo_name = NULL; /* for matching gotd.conf */

100 b09c1279 2023-03-28 stsp 	char *myserver = NULL;

101 b09c1279 2023-03-28 stsp 	const char *repo_path = NULL; /* as passed on the command line */

102 b09c1279 2023-03-28 stsp 	const char *relpath;

103 b09c1279 2023-03-28 stsp 	char *gitcommand = NULL;

104 b09c1279 2023-03-28 stsp 	struct gotd gotd;

105 b09c1279 2023-03-28 stsp 	struct gotd_repo *repo = NULL;

106 b09c1279 2023-03-28 stsp 

107 b09c1279 2023-03-28 stsp 	log_init(1, LOG_USER); /* Log to stderr. */

108 b09c1279 2023-03-28 stsp 

109 b09c1279 2023-03-28 stsp #ifndef PROFILE

110 c5d17ec8 2023-03-28 op 	if (pledge("stdio rpath exec unveil", NULL) == -1)

111 b09c1279 2023-03-28 stsp 		err(1, "pledge");

112 b09c1279 2023-03-28 stsp #endif

113 b09c1279 2023-03-28 stsp 

114 b09c1279 2023-03-28 stsp 	/*

115 b09c1279 2023-03-28 stsp 	 * Look up our own server program in PATH so we can unveil(2) it.

116 b09c1279 2023-03-28 stsp 	 * This call only errors out upon memory allocation failure.

117 b09c1279 2023-03-28 stsp 	 * If the program cannot be found then myserver will be set to NULL.

118 b09c1279 2023-03-28 stsp 	 */

119 b09c1279 2023-03-28 stsp 	error = got_path_find_prog(&myserver, GITWRAPPER_MY_SERVER_PROG);

120 b09c1279 2023-03-28 stsp 	if (error)

121 b09c1279 2023-03-28 stsp 		goto done;

122 b09c1279 2023-03-28 stsp 

123 b09c1279 2023-03-28 stsp 	/*

124 b09c1279 2023-03-28 stsp 	 * Run parse_config() before unveil(2) because parse_config()

125 b09c1279 2023-03-28 stsp 	 * checks whether repository paths exist on disk.

126 b09c1279 2023-03-28 stsp 	 * Parsing errors and warnings will be logged to stderr.

127 b09c1279 2023-03-28 stsp 	 * Upon failure we will run Git's native tooling so do not

128 b09c1279 2023-03-28 stsp 	 * bother checking for errors here.

129 b09c1279 2023-03-28 stsp 	 */

130 b09c1279 2023-03-28 stsp 	confpath = getenv("GOTD_CONF_PATH");

131 b09c1279 2023-03-28 stsp 	if (confpath == NULL)

132 b09c1279 2023-03-28 stsp 		confpath = GOTD_CONF_PATH;

133 e9e0377f 2023-03-29 stsp 	parse_config(confpath, PROC_GOTD, &gotd, 0);

134 b09c1279 2023-03-28 stsp 

135 b09c1279 2023-03-28 stsp 	error = apply_unveil(myserver);

136 b09c1279 2023-03-28 stsp 	if (error)

137 b09c1279 2023-03-28 stsp 		goto done;

138 b09c1279 2023-03-28 stsp 

139 b09c1279 2023-03-28 stsp #ifndef PROFILE

140 c5d17ec8 2023-03-28 op 	if (pledge("stdio exec", NULL) == -1)

141 b09c1279 2023-03-28 stsp 		err(1, "pledge");

142 b09c1279 2023-03-28 stsp #endif

143 b09c1279 2023-03-28 stsp 

144 b09c1279 2023-03-28 stsp 	if (strcmp(getprogname(), GOT_SERVE_CMD_SEND) == 0 ||

145 b09c1279 2023-03-28 stsp 	    strcmp(getprogname(), GOT_SERVE_CMD_FETCH) == 0) {

146 b09c1279 2023-03-28 stsp 		if (argc != 2)

147 b09c1279 2023-03-28 stsp 			usage();

148 b09c1279 2023-03-28 stsp 		command = strdup(getprogname());

149 b09c1279 2023-03-28 stsp 		if (command == NULL) {

150 b09c1279 2023-03-28 stsp 			error = got_error_from_errno("strdup");

151 b09c1279 2023-03-28 stsp 			goto done;

152 b09c1279 2023-03-28 stsp 		}

153 b09c1279 2023-03-28 stsp 		repo_path = argv[1];

154 b09c1279 2023-03-28 stsp 		relpath = argv[1];

155 b09c1279 2023-03-28 stsp 		while (relpath[0] == '/')

156 b09c1279 2023-03-28 stsp 			relpath++;

157 b09c1279 2023-03-28 stsp 		repo_name = strdup(relpath);

158 b09c1279 2023-03-28 stsp 		if (repo_name == NULL) {

159 b09c1279 2023-03-28 stsp 			error = got_error_from_errno("strdup");

160 b09c1279 2023-03-28 stsp 			goto done;

161 b09c1279 2023-03-28 stsp 		}

162 b09c1279 2023-03-28 stsp 	} else {

163 b09c1279 2023-03-28 stsp 		if (argc != 3 || strcmp(argv[1], "-c") != 0)

164 b09c1279 2023-03-28 stsp 			usage();

165 b09c1279 2023-03-28 stsp 		repo_path = argv[2];

166 b09c1279 2023-03-28 stsp 		error = got_serve_parse_command(&command, &repo_name,

167 b09c1279 2023-03-28 stsp 		    repo_path);

168 b09c1279 2023-03-28 stsp 		if (error && error->code == GOT_ERR_BAD_PACKET)

169 b09c1279 2023-03-28 stsp 			usage();

170 b09c1279 2023-03-28 stsp 		if (error)

171 b09c1279 2023-03-28 stsp 			goto done;

172 b09c1279 2023-03-28 stsp 	}

173 b09c1279 2023-03-28 stsp 

174 b09c1279 2023-03-28 stsp 	repo = gotd_find_repo_by_name(repo_name, &gotd);

175 b09c1279 2023-03-28 stsp 

176 b09c1279 2023-03-28 stsp 	/*

177 6c5befc7 2023-03-28 stsp 	 * Invoke our custom Git server if the repository was found

178 6c5befc7 2023-03-28 stsp 	 * in gotd.conf. Otherwise invoke native git(1) tooling.

179 b09c1279 2023-03-28 stsp 	 */

180 c5d17ec8 2023-03-28 op 	if (repo) {

181 c5d17ec8 2023-03-28 op 		if (myserver == NULL) {

182 c5d17ec8 2023-03-28 op 			error = got_error_fmt(GOT_ERR_NO_PROG,

183 c5d17ec8 2023-03-28 op 			    "cannot run '%s'",

184 c5d17ec8 2023-03-28 op 			    GITWRAPPER_MY_SERVER_PROG);

185 c5d17ec8 2023-03-28 op 			goto done;

186 b09c1279 2023-03-28 stsp 		}

187 c5d17ec8 2023-03-28 op 		execl(myserver, command, repo_name, (char *)NULL);

188 c5d17ec8 2023-03-28 op 		error = got_error_from_errno2("execl", myserver);

189 c5d17ec8 2023-03-28 op 	} else {

190 c5d17ec8 2023-03-28 op 		if (asprintf(&gitcommand, "%s/%s",

191 c5d17ec8 2023-03-28 op 		    GITWRAPPER_GIT_LIBEXEC_DIR, command) == -1) {

192 c5d17ec8 2023-03-28 op 			error = got_error_from_errno("asprintf");

193 c5d17ec8 2023-03-28 op 			goto done;

194 c5d17ec8 2023-03-28 op 		}

195 c5d17ec8 2023-03-28 op 		execl(gitcommand, gitcommand, repo_path, (char *)NULL);

196 c5d17ec8 2023-03-28 op 		error = got_error_from_errno2("execl", gitcommand);

197 b09c1279 2023-03-28 stsp 	}

198 b09c1279 2023-03-28 stsp 

199 b09c1279 2023-03-28 stsp done:

200 b09c1279 2023-03-28 stsp 	free(command);

201 b09c1279 2023-03-28 stsp 	free(repo_name);

202 b09c1279 2023-03-28 stsp 	free(myserver);

203 b09c1279 2023-03-28 stsp 	free(gitcommand);

204 b09c1279 2023-03-28 stsp 	if (error) {

205 b09c1279 2023-03-28 stsp 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);

206 b09c1279 2023-03-28 stsp 		return 1;

207 b09c1279 2023-03-28 stsp 	}

208 b09c1279 2023-03-28 stsp 

209 b09c1279 2023-03-28 stsp 	return 0;

210 b09c1279 2023-03-28 stsp }