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b5dd96b7 | 1 | #include "builtin.h" |
36bf1958 | 2 | #include "alloc.h" |
b5dd96b7 JK |
3 | #include "parse-options.h" |
4 | ||
5 | #ifndef NO_UNIX_SOCKETS | |
6 | ||
b2141fc1 | 7 | #include "config.h" |
9e903316 | 8 | #include "tempfile.h" |
e2770979 JK |
9 | #include "credential.h" |
10 | #include "unix-socket.h" | |
e2770979 | 11 | |
e2770979 JK |
12 | struct credential_cache_entry { |
13 | struct credential item; | |
dddbad72 | 14 | timestamp_t expiration; |
e2770979 JK |
15 | }; |
16 | static struct credential_cache_entry *entries; | |
17 | static int entries_nr; | |
18 | static int entries_alloc; | |
19 | ||
20 | static void cache_credential(struct credential *c, int timeout) | |
21 | { | |
22 | struct credential_cache_entry *e; | |
23 | ||
24 | ALLOC_GROW(entries, entries_nr + 1, entries_alloc); | |
25 | e = &entries[entries_nr++]; | |
26 | ||
27 | /* take ownership of pointers */ | |
28 | memcpy(&e->item, c, sizeof(*c)); | |
29 | memset(c, 0, sizeof(*c)); | |
30 | e->expiration = time(NULL) + timeout; | |
31 | } | |
32 | ||
33 | static struct credential_cache_entry *lookup_credential(const struct credential *c) | |
34 | { | |
35 | int i; | |
36 | for (i = 0; i < entries_nr; i++) { | |
37 | struct credential *e = &entries[i].item; | |
38 | if (credential_match(c, e)) | |
39 | return &entries[i]; | |
40 | } | |
41 | return NULL; | |
42 | } | |
43 | ||
44 | static void remove_credential(const struct credential *c) | |
45 | { | |
46 | struct credential_cache_entry *e; | |
47 | ||
48 | e = lookup_credential(c); | |
49 | if (e) | |
50 | e->expiration = 0; | |
51 | } | |
52 | ||
dddbad72 | 53 | static timestamp_t check_expirations(void) |
e2770979 | 54 | { |
dddbad72 | 55 | static timestamp_t wait_for_entry_until; |
e2770979 | 56 | int i = 0; |
dddbad72 JS |
57 | timestamp_t now = time(NULL); |
58 | timestamp_t next = TIME_MAX; | |
e2770979 JK |
59 | |
60 | /* | |
61 | * Initially give the client 30 seconds to actually contact us | |
62 | * and store a credential before we decide there's no point in | |
63 | * keeping the daemon around. | |
64 | */ | |
65 | if (!wait_for_entry_until) | |
66 | wait_for_entry_until = now + 30; | |
67 | ||
68 | while (i < entries_nr) { | |
69 | if (entries[i].expiration <= now) { | |
70 | entries_nr--; | |
71 | credential_clear(&entries[i].item); | |
72 | if (i != entries_nr) | |
73 | memcpy(&entries[i], &entries[entries_nr], sizeof(*entries)); | |
74 | /* | |
75 | * Stick around 30 seconds in case a new credential | |
76 | * shows up (e.g., because we just removed a failed | |
77 | * one, and we will soon get the correct one). | |
78 | */ | |
79 | wait_for_entry_until = now + 30; | |
80 | } | |
81 | else { | |
82 | if (entries[i].expiration < next) | |
83 | next = entries[i].expiration; | |
84 | i++; | |
85 | } | |
86 | } | |
87 | ||
88 | if (!entries_nr) { | |
89 | if (wait_for_entry_until <= now) | |
90 | return 0; | |
91 | next = wait_for_entry_until; | |
92 | } | |
93 | ||
94 | return next - now; | |
95 | } | |
96 | ||
97 | static int read_request(FILE *fh, struct credential *c, | |
3b335762 NTND |
98 | struct strbuf *action, int *timeout) |
99 | { | |
e2770979 JK |
100 | static struct strbuf item = STRBUF_INIT; |
101 | const char *p; | |
102 | ||
8f309aeb | 103 | strbuf_getline_lf(&item, fh); |
cf4fff57 | 104 | if (!skip_prefix(item.buf, "action=", &p)) |
e2770979 JK |
105 | return error("client sent bogus action line: %s", item.buf); |
106 | strbuf_addstr(action, p); | |
107 | ||
8f309aeb | 108 | strbuf_getline_lf(&item, fh); |
cf4fff57 | 109 | if (!skip_prefix(item.buf, "timeout=", &p)) |
e2770979 JK |
110 | return error("client sent bogus timeout line: %s", item.buf); |
111 | *timeout = atoi(p); | |
112 | ||
113 | if (credential_read(c, fh) < 0) | |
114 | return -1; | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static void serve_one_client(FILE *in, FILE *out) | |
119 | { | |
120 | struct credential c = CREDENTIAL_INIT; | |
121 | struct strbuf action = STRBUF_INIT; | |
122 | int timeout = -1; | |
123 | ||
124 | if (read_request(in, &c, &action, &timeout) < 0) | |
125 | /* ignore error */ ; | |
126 | else if (!strcmp(action.buf, "get")) { | |
127 | struct credential_cache_entry *e = lookup_credential(&c); | |
128 | if (e) { | |
129 | fprintf(out, "username=%s\n", e->item.username); | |
130 | fprintf(out, "password=%s\n", e->item.password); | |
d208bfdf H |
131 | if (e->item.password_expiry_utc != TIME_MAX) |
132 | fprintf(out, "password_expiry_utc=%"PRItime"\n", | |
133 | e->item.password_expiry_utc); | |
e2770979 JK |
134 | } |
135 | } | |
7d5e9c98 JK |
136 | else if (!strcmp(action.buf, "exit")) { |
137 | /* | |
138 | * It's important that we clean up our socket first, and then | |
139 | * signal the client only once we have finished the cleanup. | |
140 | * Calling exit() directly does this, because we clean up in | |
141 | * our atexit() handler, and then signal the client when our | |
142 | * process actually ends, which closes the socket and gives | |
143 | * them EOF. | |
144 | */ | |
e2770979 | 145 | exit(0); |
7d5e9c98 | 146 | } |
e2770979 JK |
147 | else if (!strcmp(action.buf, "erase")) |
148 | remove_credential(&c); | |
149 | else if (!strcmp(action.buf, "store")) { | |
150 | if (timeout < 0) | |
151 | warning("cache client didn't specify a timeout"); | |
152 | else if (!c.username || !c.password) | |
153 | warning("cache client gave us a partial credential"); | |
154 | else { | |
155 | remove_credential(&c); | |
156 | cache_credential(&c, timeout); | |
157 | } | |
158 | } | |
159 | else | |
160 | warning("cache client sent unknown action: %s", action.buf); | |
161 | ||
162 | credential_clear(&c); | |
163 | strbuf_release(&action); | |
164 | } | |
165 | ||
166 | static int serve_cache_loop(int fd) | |
167 | { | |
168 | struct pollfd pfd; | |
dddbad72 | 169 | timestamp_t wakeup; |
e2770979 JK |
170 | |
171 | wakeup = check_expirations(); | |
172 | if (!wakeup) | |
173 | return 0; | |
174 | ||
175 | pfd.fd = fd; | |
176 | pfd.events = POLLIN; | |
177 | if (poll(&pfd, 1, 1000 * wakeup) < 0) { | |
178 | if (errno != EINTR) | |
179 | die_errno("poll failed"); | |
180 | return 1; | |
181 | } | |
182 | ||
183 | if (pfd.revents & POLLIN) { | |
184 | int client, client2; | |
185 | FILE *in, *out; | |
186 | ||
187 | client = accept(fd, NULL, NULL); | |
188 | if (client < 0) { | |
26604f9f | 189 | warning_errno("accept failed"); |
e2770979 JK |
190 | return 1; |
191 | } | |
192 | client2 = dup(client); | |
193 | if (client2 < 0) { | |
26604f9f | 194 | warning_errno("dup failed"); |
e2770979 JK |
195 | close(client); |
196 | return 1; | |
197 | } | |
198 | ||
199 | in = xfdopen(client, "r"); | |
200 | out = xfdopen(client2, "w"); | |
201 | serve_one_client(in, out); | |
202 | fclose(in); | |
203 | fclose(out); | |
204 | } | |
205 | return 1; | |
206 | } | |
207 | ||
f5e3c0b9 | 208 | static void serve_cache(const char *socket_path, int debug) |
e2770979 | 209 | { |
55144ccb | 210 | struct unix_stream_listen_opts opts = UNIX_STREAM_LISTEN_OPTS_INIT; |
e2770979 JK |
211 | int fd; |
212 | ||
55144ccb | 213 | fd = unix_stream_listen(socket_path, &opts); |
e2770979 JK |
214 | if (fd < 0) |
215 | die_errno("unable to bind to '%s'", socket_path); | |
216 | ||
217 | printf("ok\n"); | |
218 | fclose(stdout); | |
f5e3c0b9 JK |
219 | if (!debug) { |
220 | if (!freopen("/dev/null", "w", stderr)) | |
221 | die_errno("unable to point stderr to /dev/null"); | |
222 | } | |
e2770979 JK |
223 | |
224 | while (serve_cache_loop(fd)) | |
225 | ; /* nothing */ | |
226 | ||
227 | close(fd); | |
e2770979 JK |
228 | } |
229 | ||
af64f20b | 230 | static const char permissions_advice[] = N_( |
e2770979 JK |
231 | "The permissions on your socket directory are too loose; other\n" |
232 | "users may be able to read your cached credentials. Consider running:\n" | |
233 | "\n" | |
af64f20b | 234 | " chmod 0700 %s"); |
a6e5e286 | 235 | static void init_socket_directory(const char *path) |
e2770979 JK |
236 | { |
237 | struct stat st; | |
238 | char *path_copy = xstrdup(path); | |
239 | char *dir = dirname(path_copy); | |
240 | ||
241 | if (!stat(dir, &st)) { | |
242 | if (st.st_mode & 077) | |
af64f20b | 243 | die(_(permissions_advice), dir); |
a6e5e286 JG |
244 | } else { |
245 | /* | |
246 | * We must be sure to create the directory with the correct mode, | |
247 | * not just chmod it after the fact; otherwise, there is a race | |
248 | * condition in which somebody can chdir to it, sleep, then try to open | |
249 | * our protected socket. | |
250 | */ | |
251 | if (safe_create_leading_directories_const(dir) < 0) | |
252 | die_errno("unable to create directories for '%s'", dir); | |
253 | if (mkdir(dir, 0700) < 0) | |
254 | die_errno("unable to mkdir '%s'", dir); | |
e2770979 JK |
255 | } |
256 | ||
6e614490 JG |
257 | if (chdir(dir)) |
258 | /* | |
259 | * We don't actually care what our cwd is; we chdir here just to | |
260 | * be a friendly daemon and avoid tying up our original cwd. | |
261 | * If this fails, it's OK to just continue without that benefit. | |
262 | */ | |
263 | ; | |
264 | ||
e2770979 JK |
265 | free(path_copy); |
266 | } | |
267 | ||
b5dd96b7 | 268 | int cmd_credential_cache_daemon(int argc, const char **argv, const char *prefix) |
e2770979 | 269 | { |
076aa2cb | 270 | struct tempfile *socket_file; |
9e903316 | 271 | const char *socket_path; |
7f4d4746 | 272 | int ignore_sighup = 0; |
f5e3c0b9 | 273 | static const char *usage[] = { |
3e4ebe3a | 274 | "git credential-cache--daemon [--debug] <socket-path>", |
f5e3c0b9 JK |
275 | NULL |
276 | }; | |
277 | int debug = 0; | |
278 | const struct option options[] = { | |
279 | OPT_BOOL(0, "debug", &debug, | |
280 | N_("print debugging messages to stderr")), | |
281 | OPT_END() | |
282 | }; | |
283 | ||
7f4d4746 NP |
284 | git_config_get_bool("credentialcache.ignoresighup", &ignore_sighup); |
285 | ||
b5dd96b7 | 286 | argc = parse_options(argc, argv, prefix, options, usage, 0); |
f5e3c0b9 | 287 | socket_path = argv[0]; |
e2770979 JK |
288 | |
289 | if (!socket_path) | |
f5e3c0b9 | 290 | usage_with_options(usage, options); |
e2770979 | 291 | |
bd93b8d9 JG |
292 | if (!is_absolute_path(socket_path)) |
293 | die("socket directory must be an absolute path"); | |
294 | ||
a6e5e286 | 295 | init_socket_directory(socket_path); |
076aa2cb | 296 | socket_file = register_tempfile(socket_path); |
7f4d4746 NP |
297 | |
298 | if (ignore_sighup) | |
299 | signal(SIGHUP, SIG_IGN); | |
300 | ||
f5e3c0b9 | 301 | serve_cache(socket_path, debug); |
9e903316 | 302 | delete_tempfile(&socket_file); |
18a3de42 | 303 | |
e2770979 JK |
304 | return 0; |
305 | } | |
b5dd96b7 JK |
306 | |
307 | #else | |
308 | ||
309 | int cmd_credential_cache_daemon(int argc, const char **argv, const char *prefix) | |
310 | { | |
311 | const char * const usage[] = { | |
3e4ebe3a | 312 | "git credential-cache--daemon [--debug] <socket-path>", |
b5dd96b7 JK |
313 | "", |
314 | "credential-cache--daemon is disabled in this build of Git", | |
315 | NULL | |
316 | }; | |
317 | struct option options[] = { OPT_END() }; | |
318 | ||
319 | argc = parse_options(argc, argv, prefix, options, usage, 0); | |
320 | die(_("credential-cache--daemon unavailable; no unix socket support")); | |
321 | } | |
322 | ||
323 | #endif /* NO_UNIX_SOCKET */ |