git-multimail: update to release 1.2.0
[git.git] / credential-cache--daemon.c
blobeef6fce4c72ab37d75a0f75129666009a6a1ee54
1 #include "cache.h"
2 #include "tempfile.h"
3 #include "credential.h"
4 #include "unix-socket.h"
5 #include "sigchain.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)
33 int i;
34 for (i = 0; i < entries_nr; i++) {
35 struct credential *e = &entries[i].item;
36 if (credential_match(c, e))
37 return &entries[i];
39 return NULL;
42 static void remove_credential(const struct credential *c)
44 struct credential_cache_entry *e;
46 e = lookup_credential(c);
47 if (e)
48 e->expiration = 0;
51 static int check_expirations(void)
53 static unsigned long wait_for_entry_until;
54 int i = 0;
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) {
68 entries_nr--;
69 credential_clear(&entries[i].item);
70 if (i != entries_nr)
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;
79 else {
80 if (entries[i].expiration < next)
81 next = entries[i].expiration;
82 i++;
86 if (!entries_nr) {
87 if (wait_for_entry_until <= now)
88 return 0;
89 next = wait_for_entry_until;
92 return next - now;
95 static int read_request(FILE *fh, struct credential *c,
96 struct strbuf *action, int *timeout) {
97 static struct strbuf item = STRBUF_INIT;
98 const char *p;
100 strbuf_getline(&item, fh, '\n');
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(&item, fh, '\n');
106 if (!skip_prefix(item.buf, "timeout=", &p))
107 return error("client sent bogus timeout line: %s", item.buf);
108 *timeout = atoi(p);
110 if (credential_read(c, fh) < 0)
111 return -1;
112 return 0;
115 static void serve_one_client(FILE *in, FILE *out)
117 struct credential c = CREDENTIAL_INIT;
118 struct strbuf action = STRBUF_INIT;
119 int timeout = -1;
121 if (read_request(in, &c, &action, &timeout) < 0)
122 /* ignore error */ ;
123 else if (!strcmp(action.buf, "get")) {
124 struct credential_cache_entry *e = lookup_credential(&c);
125 if (e) {
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"))
131 exit(0);
132 else if (!strcmp(action.buf, "erase"))
133 remove_credential(&c);
134 else if (!strcmp(action.buf, "store")) {
135 if (timeout < 0)
136 warning("cache client didn't specify a timeout");
137 else if (!c.username || !c.password)
138 warning("cache client gave us a partial credential");
139 else {
140 remove_credential(&c);
141 cache_credential(&c, timeout);
144 else
145 warning("cache client sent unknown action: %s", action.buf);
147 credential_clear(&c);
148 strbuf_release(&action);
151 static int serve_cache_loop(int fd)
153 struct pollfd pfd;
154 unsigned long wakeup;
156 wakeup = check_expirations();
157 if (!wakeup)
158 return 0;
160 pfd.fd = fd;
161 pfd.events = POLLIN;
162 if (poll(&pfd, 1, 1000 * wakeup) < 0) {
163 if (errno != EINTR)
164 die_errno("poll failed");
165 return 1;
168 if (pfd.revents & POLLIN) {
169 int client, client2;
170 FILE *in, *out;
172 client = accept(fd, NULL, NULL);
173 if (client < 0) {
174 warning("accept failed: %s", strerror(errno));
175 return 1;
177 client2 = dup(client);
178 if (client2 < 0) {
179 warning("dup failed: %s", strerror(errno));
180 close(client);
181 return 1;
184 in = xfdopen(client, "r");
185 out = xfdopen(client2, "w");
186 serve_one_client(in, out);
187 fclose(in);
188 fclose(out);
190 return 1;
193 static void serve_cache(const char *socket_path, int debug)
195 int fd;
197 fd = unix_stream_listen(socket_path);
198 if (fd < 0)
199 die_errno("unable to bind to '%s'", socket_path);
201 printf("ok\n");
202 fclose(stdout);
203 if (!debug) {
204 if (!freopen("/dev/null", "w", stderr))
205 die_errno("unable to point stderr to /dev/null");
208 while (serve_cache_loop(fd))
209 ; /* nothing */
211 close(fd);
214 static const char permissions_advice[] =
215 "The permissions on your socket directory are too loose; other\n"
216 "users may be able to read your cached credentials. Consider running:\n"
217 "\n"
218 " chmod 0700 %s";
219 static void check_socket_directory(const char *path)
221 struct stat st;
222 char *path_copy = xstrdup(path);
223 char *dir = dirname(path_copy);
225 if (!stat(dir, &st)) {
226 if (st.st_mode & 077)
227 die(permissions_advice, dir);
228 free(path_copy);
229 return;
233 * We must be sure to create the directory with the correct mode,
234 * not just chmod it after the fact; otherwise, there is a race
235 * condition in which somebody can chdir to it, sleep, then try to open
236 * our protected socket.
238 if (safe_create_leading_directories_const(dir) < 0)
239 die_errno("unable to create directories for '%s'", dir);
240 if (mkdir(dir, 0700) < 0)
241 die_errno("unable to mkdir '%s'", dir);
242 free(path_copy);
245 int main(int argc, const char **argv)
247 const char *socket_path;
248 static const char *usage[] = {
249 "git-credential-cache--daemon [opts] <socket_path>",
250 NULL
252 int debug = 0;
253 const struct option options[] = {
254 OPT_BOOL(0, "debug", &debug,
255 N_("print debugging messages to stderr")),
256 OPT_END()
259 argc = parse_options(argc, argv, NULL, options, usage, 0);
260 socket_path = argv[0];
262 if (!socket_path)
263 usage_with_options(usage, options);
265 check_socket_directory(socket_path);
266 register_tempfile(&socket_file, socket_path);
267 serve_cache(socket_path, debug);
268 delete_tempfile(&socket_file);
270 return 0;