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Commit | Line | Data |
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b5dd96b7 JK |
1 | #include "builtin.h" |
2 | #include "parse-options.h" | |
3 | ||
4 | #ifndef NO_UNIX_SOCKETS | |
5 | ||
b2141fc1 | 6 | #include "config.h" |
9e903316 | 7 | #include "tempfile.h" |
e2770979 JK |
8 | #include "credential.h" |
9 | #include "unix-socket.h" | |
e2770979 | 10 | |
e2770979 JK |
11 | struct credential_cache_entry { |
12 | struct credential item; | |
dddbad72 | 13 | timestamp_t expiration; |
e2770979 JK |
14 | }; |
15 | static struct credential_cache_entry *entries; | |
16 | static int entries_nr; | |
17 | static int entries_alloc; | |
18 | ||
19 | static void cache_credential(struct credential *c, int timeout) | |
20 | { | |
21 | struct credential_cache_entry *e; | |
22 | ||
23 | ALLOC_GROW(entries, entries_nr + 1, entries_alloc); | |
24 | e = &entries[entries_nr++]; | |
25 | ||
26 | /* take ownership of pointers */ | |
27 | memcpy(&e->item, c, sizeof(*c)); | |
28 | memset(c, 0, sizeof(*c)); | |
29 | e->expiration = time(NULL) + timeout; | |
30 | } | |
31 | ||
32 | static struct credential_cache_entry *lookup_credential(const struct credential *c) | |
33 | { | |
34 | int i; | |
35 | for (i = 0; i < entries_nr; i++) { | |
36 | struct credential *e = &entries[i].item; | |
37 | if (credential_match(c, e)) | |
38 | return &entries[i]; | |
39 | } | |
40 | return NULL; | |
41 | } | |
42 | ||
43 | static void remove_credential(const struct credential *c) | |
44 | { | |
45 | struct credential_cache_entry *e; | |
46 | ||
47 | e = lookup_credential(c); | |
48 | if (e) | |
49 | e->expiration = 0; | |
50 | } | |
51 | ||
dddbad72 | 52 | static timestamp_t check_expirations(void) |
e2770979 | 53 | { |
dddbad72 | 54 | static timestamp_t wait_for_entry_until; |
e2770979 | 55 | int i = 0; |
dddbad72 JS |
56 | timestamp_t now = time(NULL); |
57 | timestamp_t next = TIME_MAX; | |
e2770979 JK |
58 | |
59 | /* | |
60 | * Initially give the client 30 seconds to actually contact us | |
61 | * and store a credential before we decide there's no point in | |
62 | * keeping the daemon around. | |
63 | */ | |
64 | if (!wait_for_entry_until) | |
65 | wait_for_entry_until = now + 30; | |
66 | ||
67 | while (i < entries_nr) { | |
68 | if (entries[i].expiration <= now) { | |
69 | entries_nr--; | |
70 | credential_clear(&entries[i].item); | |
71 | if (i != entries_nr) | |
72 | memcpy(&entries[i], &entries[entries_nr], sizeof(*entries)); | |
73 | /* | |
74 | * Stick around 30 seconds in case a new credential | |
75 | * shows up (e.g., because we just removed a failed | |
76 | * one, and we will soon get the correct one). | |
77 | */ | |
78 | wait_for_entry_until = now + 30; | |
79 | } | |
80 | else { | |
81 | if (entries[i].expiration < next) | |
82 | next = entries[i].expiration; | |
83 | i++; | |
84 | } | |
85 | } | |
86 | ||
87 | if (!entries_nr) { | |
88 | if (wait_for_entry_until <= now) | |
89 | return 0; | |
90 | next = wait_for_entry_until; | |
91 | } | |
92 | ||
93 | return next - now; | |
94 | } | |
95 | ||
96 | static int read_request(FILE *fh, struct credential *c, | |
3b335762 NTND |
97 | struct strbuf *action, int *timeout) |
98 | { | |
e2770979 JK |
99 | static struct strbuf item = STRBUF_INIT; |
100 | const char *p; | |
101 | ||
8f309aeb | 102 | strbuf_getline_lf(&item, fh); |
cf4fff57 | 103 | if (!skip_prefix(item.buf, "action=", &p)) |
e2770979 JK |
104 | return error("client sent bogus action line: %s", item.buf); |
105 | strbuf_addstr(action, p); | |
106 | ||
8f309aeb | 107 | strbuf_getline_lf(&item, fh); |
cf4fff57 | 108 | if (!skip_prefix(item.buf, "timeout=", &p)) |
e2770979 JK |
109 | return error("client sent bogus timeout line: %s", item.buf); |
110 | *timeout = atoi(p); | |
111 | ||
112 | if (credential_read(c, fh) < 0) | |
113 | return -1; | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static void serve_one_client(FILE *in, FILE *out) | |
118 | { | |
119 | struct credential c = CREDENTIAL_INIT; | |
120 | struct strbuf action = STRBUF_INIT; | |
121 | int timeout = -1; | |
122 | ||
123 | if (read_request(in, &c, &action, &timeout) < 0) | |
124 | /* ignore error */ ; | |
125 | else if (!strcmp(action.buf, "get")) { | |
126 | struct credential_cache_entry *e = lookup_credential(&c); | |
127 | if (e) { | |
128 | fprintf(out, "username=%s\n", e->item.username); | |
129 | fprintf(out, "password=%s\n", e->item.password); | |
130 | } | |
131 | } | |
7d5e9c98 JK |
132 | else if (!strcmp(action.buf, "exit")) { |
133 | /* | |
134 | * It's important that we clean up our socket first, and then | |
135 | * signal the client only once we have finished the cleanup. | |
136 | * Calling exit() directly does this, because we clean up in | |
137 | * our atexit() handler, and then signal the client when our | |
138 | * process actually ends, which closes the socket and gives | |
139 | * them EOF. | |
140 | */ | |
e2770979 | 141 | exit(0); |
7d5e9c98 | 142 | } |
e2770979 JK |
143 | else if (!strcmp(action.buf, "erase")) |
144 | remove_credential(&c); | |
145 | else if (!strcmp(action.buf, "store")) { | |
146 | if (timeout < 0) | |
147 | warning("cache client didn't specify a timeout"); | |
148 | else if (!c.username || !c.password) | |
149 | warning("cache client gave us a partial credential"); | |
150 | else { | |
151 | remove_credential(&c); | |
152 | cache_credential(&c, timeout); | |
153 | } | |
154 | } | |
155 | else | |
156 | warning("cache client sent unknown action: %s", action.buf); | |
157 | ||
158 | credential_clear(&c); | |
159 | strbuf_release(&action); | |
160 | } | |
161 | ||
162 | static int serve_cache_loop(int fd) | |
163 | { | |
164 | struct pollfd pfd; | |
dddbad72 | 165 | timestamp_t wakeup; |
e2770979 JK |
166 | |
167 | wakeup = check_expirations(); | |
168 | if (!wakeup) | |
169 | return 0; | |
170 | ||
171 | pfd.fd = fd; | |
172 | pfd.events = POLLIN; | |
173 | if (poll(&pfd, 1, 1000 * wakeup) < 0) { | |
174 | if (errno != EINTR) | |
175 | die_errno("poll failed"); | |
176 | return 1; | |
177 | } | |
178 | ||
179 | if (pfd.revents & POLLIN) { | |
180 | int client, client2; | |
181 | FILE *in, *out; | |
182 | ||
183 | client = accept(fd, NULL, NULL); | |
184 | if (client < 0) { | |
26604f9f | 185 | warning_errno("accept failed"); |
e2770979 JK |
186 | return 1; |
187 | } | |
188 | client2 = dup(client); | |
189 | if (client2 < 0) { | |
26604f9f | 190 | warning_errno("dup failed"); |
e2770979 JK |
191 | close(client); |
192 | return 1; | |
193 | } | |
194 | ||
195 | in = xfdopen(client, "r"); | |
196 | out = xfdopen(client2, "w"); | |
197 | serve_one_client(in, out); | |
198 | fclose(in); | |
199 | fclose(out); | |
200 | } | |
201 | return 1; | |
202 | } | |
203 | ||
f5e3c0b9 | 204 | static void serve_cache(const char *socket_path, int debug) |
e2770979 JK |
205 | { |
206 | int fd; | |
207 | ||
208 | fd = unix_stream_listen(socket_path); | |
209 | if (fd < 0) | |
210 | die_errno("unable to bind to '%s'", socket_path); | |
211 | ||
212 | printf("ok\n"); | |
213 | fclose(stdout); | |
f5e3c0b9 JK |
214 | if (!debug) { |
215 | if (!freopen("/dev/null", "w", stderr)) | |
216 | die_errno("unable to point stderr to /dev/null"); | |
217 | } | |
e2770979 JK |
218 | |
219 | while (serve_cache_loop(fd)) | |
220 | ; /* nothing */ | |
221 | ||
222 | close(fd); | |
e2770979 JK |
223 | } |
224 | ||
af64f20b | 225 | static const char permissions_advice[] = N_( |
e2770979 JK |
226 | "The permissions on your socket directory are too loose; other\n" |
227 | "users may be able to read your cached credentials. Consider running:\n" | |
228 | "\n" | |
af64f20b | 229 | " chmod 0700 %s"); |
a6e5e286 | 230 | static void init_socket_directory(const char *path) |
e2770979 JK |
231 | { |
232 | struct stat st; | |
233 | char *path_copy = xstrdup(path); | |
234 | char *dir = dirname(path_copy); | |
235 | ||
236 | if (!stat(dir, &st)) { | |
237 | if (st.st_mode & 077) | |
af64f20b | 238 | die(_(permissions_advice), dir); |
a6e5e286 JG |
239 | } else { |
240 | /* | |
241 | * We must be sure to create the directory with the correct mode, | |
242 | * not just chmod it after the fact; otherwise, there is a race | |
243 | * condition in which somebody can chdir to it, sleep, then try to open | |
244 | * our protected socket. | |
245 | */ | |
246 | if (safe_create_leading_directories_const(dir) < 0) | |
247 | die_errno("unable to create directories for '%s'", dir); | |
248 | if (mkdir(dir, 0700) < 0) | |
249 | die_errno("unable to mkdir '%s'", dir); | |
e2770979 JK |
250 | } |
251 | ||
6e614490 JG |
252 | if (chdir(dir)) |
253 | /* | |
254 | * We don't actually care what our cwd is; we chdir here just to | |
255 | * be a friendly daemon and avoid tying up our original cwd. | |
256 | * If this fails, it's OK to just continue without that benefit. | |
257 | */ | |
258 | ; | |
259 | ||
e2770979 JK |
260 | free(path_copy); |
261 | } | |
262 | ||
b5dd96b7 | 263 | int cmd_credential_cache_daemon(int argc, const char **argv, const char *prefix) |
e2770979 | 264 | { |
076aa2cb | 265 | struct tempfile *socket_file; |
9e903316 | 266 | const char *socket_path; |
7f4d4746 | 267 | int ignore_sighup = 0; |
f5e3c0b9 JK |
268 | static const char *usage[] = { |
269 | "git-credential-cache--daemon [opts] <socket_path>", | |
270 | NULL | |
271 | }; | |
272 | int debug = 0; | |
273 | const struct option options[] = { | |
274 | OPT_BOOL(0, "debug", &debug, | |
275 | N_("print debugging messages to stderr")), | |
276 | OPT_END() | |
277 | }; | |
278 | ||
7f4d4746 NP |
279 | git_config_get_bool("credentialcache.ignoresighup", &ignore_sighup); |
280 | ||
b5dd96b7 | 281 | argc = parse_options(argc, argv, prefix, options, usage, 0); |
f5e3c0b9 | 282 | socket_path = argv[0]; |
e2770979 JK |
283 | |
284 | if (!socket_path) | |
f5e3c0b9 | 285 | usage_with_options(usage, options); |
e2770979 | 286 | |
bd93b8d9 JG |
287 | if (!is_absolute_path(socket_path)) |
288 | die("socket directory must be an absolute path"); | |
289 | ||
a6e5e286 | 290 | init_socket_directory(socket_path); |
076aa2cb | 291 | socket_file = register_tempfile(socket_path); |
7f4d4746 NP |
292 | |
293 | if (ignore_sighup) | |
294 | signal(SIGHUP, SIG_IGN); | |
295 | ||
f5e3c0b9 | 296 | serve_cache(socket_path, debug); |
9e903316 | 297 | delete_tempfile(&socket_file); |
18a3de42 | 298 | |
e2770979 JK |
299 | return 0; |
300 | } | |
b5dd96b7 JK |
301 | |
302 | #else | |
303 | ||
304 | int cmd_credential_cache_daemon(int argc, const char **argv, const char *prefix) | |
305 | { | |
306 | const char * const usage[] = { | |
307 | "git credential-cache--daemon [options] <action>", | |
308 | "", | |
309 | "credential-cache--daemon is disabled in this build of Git", | |
310 | NULL | |
311 | }; | |
312 | struct option options[] = { OPT_END() }; | |
313 | ||
314 | argc = parse_options(argc, argv, prefix, options, usage, 0); | |
315 | die(_("credential-cache--daemon unavailable; no unix socket support")); | |
316 | } | |
317 | ||
318 | #endif /* NO_UNIX_SOCKET */ |