4 #include "credential.h"
5 #include "unix-socket.h"
6 #include "parse-options.h"
8 static struct tempfile socket_file;
10 struct credential_cache_entry {
11 struct credential item;
12 unsigned long expiration;
14 static struct credential_cache_entry *entries;
15 static int entries_nr;
16 static int entries_alloc;
18 static void cache_credential(struct credential *c, int timeout)
20 struct credential_cache_entry *e;
22 ALLOC_GROW(entries, entries_nr + 1, entries_alloc);
23 e = &entries[entries_nr++];
25 /* take ownership of pointers */
26 memcpy(&e->item, c, sizeof(*c));
27 memset(c, 0, sizeof(*c));
28 e->expiration = time(NULL) + timeout;
31 static struct credential_cache_entry *lookup_credential(const struct credential *c)
34 for (i = 0; i < entries_nr; i++) {
35 struct credential *e = &entries[i].item;
36 if (credential_match(c, e))
42 static void remove_credential(const struct credential *c)
44 struct credential_cache_entry *e;
46 e = lookup_credential(c);
51 static int check_expirations(void)
53 static unsigned long wait_for_entry_until;
55 unsigned long now = time(NULL);
56 unsigned long next = (unsigned long)-1;
59 * Initially give the client 30 seconds to actually contact us
60 * and store a credential before we decide there's no point in
61 * keeping the daemon around.
63 if (!wait_for_entry_until)
64 wait_for_entry_until = now + 30;
66 while (i < entries_nr) {
67 if (entries[i].expiration <= now) {
69 credential_clear(&entries[i].item);
71 memcpy(&entries[i], &entries[entries_nr], sizeof(*entries));
73 * Stick around 30 seconds in case a new credential
74 * shows up (e.g., because we just removed a failed
75 * one, and we will soon get the correct one).
77 wait_for_entry_until = now + 30;
80 if (entries[i].expiration < next)
81 next = entries[i].expiration;
87 if (wait_for_entry_until <= now)
89 next = wait_for_entry_until;
95 static int read_request(FILE *fh, struct credential *c,
96 struct strbuf *action, int *timeout) {
97 static struct strbuf item = STRBUF_INIT;
100 strbuf_getline_lf(&item, fh);
101 if (!skip_prefix(item.buf, "action=", &p))
102 return error("client sent bogus action line: %s", item.buf);
103 strbuf_addstr(action, p);
105 strbuf_getline_lf(&item, fh);
106 if (!skip_prefix(item.buf, "timeout=", &p))
107 return error("client sent bogus timeout line: %s", item.buf);
110 if (credential_read(c, fh) < 0)
115 static void serve_one_client(FILE *in, FILE *out)
117 struct credential c = CREDENTIAL_INIT;
118 struct strbuf action = STRBUF_INIT;
121 if (read_request(in, &c, &action, &timeout) < 0)
123 else if (!strcmp(action.buf, "get")) {
124 struct credential_cache_entry *e = lookup_credential(&c);
126 fprintf(out, "username=%s\n", e->item.username);
127 fprintf(out, "password=%s\n", e->item.password);
130 else if (!strcmp(action.buf, "exit")) {
132 * It's important that we clean up our socket first, and then
133 * signal the client only once we have finished the cleanup.
134 * Calling exit() directly does this, because we clean up in
135 * our atexit() handler, and then signal the client when our
136 * process actually ends, which closes the socket and gives
141 else if (!strcmp(action.buf, "erase"))
142 remove_credential(&c);
143 else if (!strcmp(action.buf, "store")) {
145 warning("cache client didn't specify a timeout");
146 else if (!c.username || !c.password)
147 warning("cache client gave us a partial credential");
149 remove_credential(&c);
150 cache_credential(&c, timeout);
154 warning("cache client sent unknown action: %s", action.buf);
156 credential_clear(&c);
157 strbuf_release(&action);
160 static int serve_cache_loop(int fd)
163 unsigned long wakeup;
165 wakeup = check_expirations();
171 if (poll(&pfd, 1, 1000 * wakeup) < 0) {
173 die_errno("poll failed");
177 if (pfd.revents & POLLIN) {
181 client = accept(fd, NULL, NULL);
183 warning_errno("accept failed");
186 client2 = dup(client);
188 warning_errno("dup failed");
193 in = xfdopen(client, "r");
194 out = xfdopen(client2, "w");
195 serve_one_client(in, out);
202 static void serve_cache(const char *socket_path, int debug)
206 fd = unix_stream_listen(socket_path);
208 die_errno("unable to bind to '%s'", socket_path);
213 if (!freopen("/dev/null", "w", stderr))
214 die_errno("unable to point stderr to /dev/null");
217 while (serve_cache_loop(fd))
223 static const char permissions_advice[] = N_(
224 "The permissions on your socket directory are too loose; other\n"
225 "users may be able to read your cached credentials. Consider running:\n"
228 static void init_socket_directory(const char *path)
231 char *path_copy = xstrdup(path);
232 char *dir = dirname(path_copy);
234 if (!stat(dir, &st)) {
235 if (st.st_mode & 077)
236 die(_(permissions_advice), dir);
239 * We must be sure to create the directory with the correct mode,
240 * not just chmod it after the fact; otherwise, there is a race
241 * condition in which somebody can chdir to it, sleep, then try to open
242 * our protected socket.
244 if (safe_create_leading_directories_const(dir) < 0)
245 die_errno("unable to create directories for '%s'", dir);
246 if (mkdir(dir, 0700) < 0)
247 die_errno("unable to mkdir '%s'", dir);
252 * We don't actually care what our cwd is; we chdir here just to
253 * be a friendly daemon and avoid tying up our original cwd.
254 * If this fails, it's OK to just continue without that benefit.
261 int cmd_main(int argc, const char **argv)
263 const char *socket_path;
264 int ignore_sighup = 0;
265 static const char *usage[] = {
266 "git-credential-cache--daemon [opts] <socket_path>",
270 const struct option options[] = {
271 OPT_BOOL(0, "debug", &debug,
272 N_("print debugging messages to stderr")),
276 git_config_get_bool("credentialcache.ignoresighup", &ignore_sighup);
278 argc = parse_options(argc, argv, NULL, options, usage, 0);
279 socket_path = argv[0];
282 usage_with_options(usage, options);
284 if (!is_absolute_path(socket_path))
285 die("socket directory must be an absolute path");
287 init_socket_directory(socket_path);
288 register_tempfile(&socket_file, socket_path);
291 signal(SIGHUP, SIG_IGN);
293 serve_cache(socket_path, debug);
294 delete_tempfile(&socket_file);