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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8c6db833 | 2 | |
00229fe4 | 3 | #include <endian.h> |
8c6db833 LP |
4 | #include <errno.h> |
5 | #include <fcntl.h> | |
8c6db833 | 6 | #include <pwd.h> |
8c6db833 | 7 | #include <security/_pam_macros.h> |
8c6db833 LP |
8 | #include <security/pam_ext.h> |
9 | #include <security/pam_misc.h> | |
00229fe4 LP |
10 | #include <security/pam_modules.h> |
11 | #include <security/pam_modutil.h> | |
12 | #include <sys/file.h> | |
ca78ad1d ZJS |
13 | #include <sys/stat.h> |
14 | #include <sys/types.h> | |
15 | #include <unistd.h> | |
8c6db833 | 16 | |
b5efdb8a | 17 | #include "alloc-util.h" |
430f0182 | 18 | #include "audit-util.h" |
00229fe4 LP |
19 | #include "bus-common-errors.h" |
20 | #include "bus-error.h" | |
47094ce0 | 21 | #include "bus-internal.h" |
ffcfcb6b | 22 | #include "bus-util.h" |
fdb3deca | 23 | #include "cgroup-setup.h" |
4bbccb02 | 24 | #include "errno-util.h" |
3ffd4af2 | 25 | #include "fd-util.h" |
a5c32cff | 26 | #include "fileio.h" |
f97b34a6 | 27 | #include "format-util.h" |
958b66ea | 28 | #include "hostname-util.h" |
00229fe4 LP |
29 | #include "login-util.h" |
30 | #include "macro.h" | |
d750dde2 | 31 | #include "pam-util.h" |
6bedfcbb | 32 | #include "parse-util.h" |
e37e5ed3 | 33 | #include "path-util.h" |
df0ff127 | 34 | #include "process-util.h" |
00229fe4 | 35 | #include "socket-util.h" |
055c08ef | 36 | #include "stdio-util.h" |
00229fe4 LP |
37 | #include "strv.h" |
38 | #include "terminal-util.h" | |
9ab0d3eb LP |
39 | #include "user-util.h" |
40 | #include "userdb.h" | |
8c6db833 | 41 | |
fbcb6300 LP |
42 | #define LOGIN_SLOW_BUS_CALL_TIMEOUT_USEC (2*USEC_PER_MINUTE) |
43 | ||
baae0358 LP |
44 | static int parse_argv( |
45 | pam_handle_t *handle, | |
46 | int argc, const char **argv, | |
47 | const char **class, | |
49ebd11f | 48 | const char **type, |
f5cb2820 | 49 | const char **desktop, |
baae0358 | 50 | bool *debug) { |
8c6db833 LP |
51 | |
52 | unsigned i; | |
53 | ||
54 | assert(argc >= 0); | |
55 | assert(argc == 0 || argv); | |
56 | ||
49ebd11f | 57 | for (i = 0; i < (unsigned) argc; i++) { |
d9608d40 LP |
58 | const char *p; |
59 | ||
60 | if ((p = startswith(argv[i], "class="))) { | |
485507b8 | 61 | if (class) |
d9608d40 | 62 | *class = p; |
485507b8 | 63 | |
d9608d40 | 64 | } else if ((p = startswith(argv[i], "type="))) { |
49ebd11f | 65 | if (type) |
d9608d40 | 66 | *type = p; |
49ebd11f | 67 | |
d9608d40 | 68 | } else if ((p = startswith(argv[i], "desktop="))) { |
f5cb2820 | 69 | if (desktop) |
d9608d40 | 70 | *desktop = p; |
f5cb2820 | 71 | |
05a049cc ZJS |
72 | } else if (streq(argv[i], "debug")) { |
73 | if (debug) | |
74 | *debug = true; | |
fb6becb4 | 75 | |
d9608d40 | 76 | } else if ((p = startswith(argv[i], "debug="))) { |
05a049cc | 77 | int k; |
0e318cad | 78 | |
d9608d40 | 79 | k = parse_boolean(p); |
05a049cc | 80 | if (k < 0) |
d9608d40 | 81 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring: %s", p); |
05a049cc | 82 | else if (debug) |
0e318cad MS |
83 | *debug = k; |
84 | ||
05a049cc | 85 | } else |
fb6becb4 | 86 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
49ebd11f | 87 | } |
8c6db833 | 88 | |
8c6db833 LP |
89 | return 0; |
90 | } | |
91 | ||
9ab0d3eb | 92 | static int acquire_user_record( |
8c6db833 | 93 | pam_handle_t *handle, |
9ab0d3eb | 94 | UserRecord **ret_record) { |
8c6db833 | 95 | |
9ab0d3eb LP |
96 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL; |
97 | const char *username = NULL, *json = NULL; | |
8c6db833 LP |
98 | int r; |
99 | ||
100 | assert(handle); | |
8c6db833 | 101 | |
baae0358 LP |
102 | r = pam_get_user(handle, &username, NULL); |
103 | if (r != PAM_SUCCESS) { | |
d9608d40 | 104 | pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r)); |
baae0358 LP |
105 | return r; |
106 | } | |
d90b9d27 | 107 | |
baae0358 LP |
108 | if (isempty(username)) { |
109 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
9ab0d3eb | 110 | return PAM_SERVICE_ERR; |
8c6db833 LP |
111 | } |
112 | ||
9ab0d3eb LP |
113 | /* If pam_systemd_homed (or some other module) already acqired the user record we can reuse it |
114 | * here. */ | |
115 | r = pam_get_data(handle, "systemd-user-record", (const void**) &json); | |
116 | if (r != PAM_SUCCESS || !json) { | |
117 | _cleanup_free_ char *formatted = NULL; | |
118 | ||
119 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
120 | pam_syslog(handle, LOG_ERR, "Failed to get PAM user record data: %s", pam_strerror(handle, r)); | |
121 | return r; | |
122 | } | |
123 | ||
124 | /* Request the record ourselves */ | |
125 | r = userdb_by_name(username, 0, &ur); | |
126 | if (r < 0) { | |
127 | pam_syslog(handle, LOG_ERR, "Failed to get user record: %s", strerror_safe(r)); | |
128 | return PAM_USER_UNKNOWN; | |
129 | } | |
130 | ||
131 | r = json_variant_format(ur->json, 0, &formatted); | |
132 | if (r < 0) { | |
133 | pam_syslog(handle, LOG_ERR, "Failed to format user JSON: %s", strerror_safe(r)); | |
134 | return PAM_SERVICE_ERR; | |
135 | } | |
136 | ||
137 | /* And cache it for everyone else */ | |
138 | r = pam_set_data(handle, "systemd-user-record", formatted, pam_cleanup_free); | |
139 | if (r < 0) { | |
140 | pam_syslog(handle, LOG_ERR, "Failed to set PAM user record data: %s", pam_strerror(handle, r)); | |
141 | return r; | |
142 | } | |
143 | ||
144 | TAKE_PTR(formatted); | |
145 | } else { | |
146 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
147 | ||
148 | /* Parse cached record */ | |
149 | r = json_parse(json, JSON_PARSE_SENSITIVE, &v, NULL, NULL); | |
150 | if (r < 0) { | |
151 | pam_syslog(handle, LOG_ERR, "Failed to parse JSON user record: %s", strerror_safe(r)); | |
152 | return PAM_SERVICE_ERR; | |
153 | } | |
154 | ||
155 | ur = user_record_new(); | |
156 | if (!ur) | |
157 | return pam_log_oom(handle); | |
158 | ||
159 | r = user_record_load(ur, v, USER_RECORD_LOAD_REFUSE_SECRET); | |
160 | if (r < 0) { | |
161 | pam_syslog(handle, LOG_ERR, "Failed to load user record: %s", strerror_safe(r)); | |
162 | return PAM_SERVICE_ERR; | |
163 | } | |
164 | ||
165 | /* Safety check if cached record actually matches what we are looking for */ | |
166 | if (!streq_ptr(username, ur->user_name)) { | |
167 | pam_syslog(handle, LOG_ERR, "Acquired user record does not match user name."); | |
168 | return PAM_SERVICE_ERR; | |
169 | } | |
170 | } | |
171 | ||
172 | if (!uid_is_valid(ur->uid)) { | |
173 | pam_syslog(handle, LOG_ERR, "Acquired user record does not have a UID."); | |
174 | return PAM_SERVICE_ERR; | |
8c6db833 LP |
175 | } |
176 | ||
9ab0d3eb LP |
177 | if (ret_record) |
178 | *ret_record = TAKE_PTR(ur); | |
8c6db833 LP |
179 | |
180 | return PAM_SUCCESS; | |
181 | } | |
182 | ||
ecd5f1a9 LP |
183 | static bool display_is_local(const char *display) { |
184 | assert(display); | |
185 | ||
186 | return | |
187 | display[0] == ':' && | |
188 | display[1] >= '0' && | |
189 | display[1] <= '9'; | |
190 | } | |
191 | ||
f7b8b5c4 LP |
192 | static int socket_from_display(const char *display, char **path) { |
193 | size_t k; | |
194 | char *f, *c; | |
195 | ||
196 | assert(display); | |
197 | assert(path); | |
198 | ||
199 | if (!display_is_local(display)) | |
200 | return -EINVAL; | |
201 | ||
202 | k = strspn(display+1, "0123456789"); | |
203 | ||
204 | f = new(char, STRLEN("/tmp/.X11-unix/X") + k + 1); | |
205 | if (!f) | |
206 | return -ENOMEM; | |
207 | ||
208 | c = stpcpy(f, "/tmp/.X11-unix/X"); | |
209 | memcpy(c, display+1, k); | |
210 | c[k] = 0; | |
211 | ||
212 | *path = f; | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
4d6d6518 | 217 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
15a3e96f | 218 | union sockaddr_union sa = {}; |
baae0358 LP |
219 | _cleanup_free_ char *p = NULL, *tty = NULL; |
220 | _cleanup_close_ int fd = -1; | |
4d6d6518 | 221 | struct ucred ucred; |
15a3e96f | 222 | int v, r, salen; |
4d6d6518 LP |
223 | |
224 | assert(display); | |
4d6d6518 LP |
225 | assert(vtnr); |
226 | ||
227 | /* We deduce the X11 socket from the display name, then use | |
228 | * SO_PEERCRED to determine the X11 server process, ask for | |
229 | * the controlling tty of that and if it's a VC then we know | |
230 | * the seat and the virtual terminal. Sounds ugly, is only | |
231 | * semi-ugly. */ | |
232 | ||
233 | r = socket_from_display(display, &p); | |
234 | if (r < 0) | |
235 | return r; | |
15a3e96f LP |
236 | salen = sockaddr_un_set_path(&sa.un, p); |
237 | if (salen < 0) | |
238 | return salen; | |
4d6d6518 LP |
239 | |
240 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); | |
b92bea5d | 241 | if (fd < 0) |
4d6d6518 | 242 | return -errno; |
4d6d6518 | 243 | |
15a3e96f | 244 | if (connect(fd, &sa.sa, salen) < 0) |
4d6d6518 | 245 | return -errno; |
4d6d6518 | 246 | |
eff05270 | 247 | r = getpeercred(fd, &ucred); |
4d6d6518 | 248 | if (r < 0) |
eff05270 | 249 | return r; |
4d6d6518 LP |
250 | |
251 | r = get_ctty(ucred.pid, NULL, &tty); | |
252 | if (r < 0) | |
253 | return r; | |
254 | ||
255 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
256 | if (v < 0) |
257 | return v; | |
258 | else if (v == 0) | |
259 | return -ENOENT; | |
260 | ||
fc7985ed LP |
261 | if (seat) |
262 | *seat = "seat0"; | |
4d6d6518 LP |
263 | *vtnr = (uint32_t) v; |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
00efd498 ZJS |
268 | static int export_legacy_dbus_address( |
269 | pam_handle_t *handle, | |
270 | uid_t uid, | |
271 | const char *runtime) { | |
272 | ||
15ee6c20 ZJS |
273 | const char *s; |
274 | _cleanup_free_ char *t = NULL; | |
00efd498 ZJS |
275 | int r = PAM_BUF_ERR; |
276 | ||
15ee6c20 ZJS |
277 | /* We need to export $DBUS_SESSION_BUS_ADDRESS because various applications will not connect |
278 | * correctly to the bus without it. This setting matches what dbus.socket does for the user | |
279 | * session using 'systemctl --user set-environment'. We want to have the same configuration | |
280 | * in processes started from the PAM session. | |
281 | * | |
282 | * The setting of the address is guarded by the access() check because it is also possible to compile | |
283 | * dbus without --enable-user-session, in which case this socket is not used, and | |
284 | * $DBUS_SESSION_BUS_ADDRESS should not be set. An alternative approach would to not do the access() | |
285 | * check here, and let applications try on their own, by using "unix:path=%s/bus;autolaunch:". But we | |
286 | * expect the socket to be present by the time we do this check, so we can just as well check once | |
287 | * here. */ | |
288 | ||
289 | s = strjoina(runtime, "/bus"); | |
290 | if (access(s, F_OK) < 0) | |
291 | return PAM_SUCCESS; | |
292 | ||
293 | if (asprintf(&t, DEFAULT_USER_BUS_ADDRESS_FMT, runtime) < 0) | |
d750dde2 | 294 | return pam_log_oom(handle); |
00efd498 | 295 | |
15ee6c20 | 296 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", t, 0); |
d750dde2 LP |
297 | if (r != PAM_SUCCESS) { |
298 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable: %s", pam_strerror(handle, r)); | |
299 | return r; | |
300 | } | |
00efd498 ZJS |
301 | |
302 | return PAM_SUCCESS; | |
00efd498 ZJS |
303 | } |
304 | ||
22f93314 JS |
305 | static int append_session_memory_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
306 | uint64_t val; | |
307 | int r; | |
308 | ||
309 | if (isempty(limit)) | |
310 | return 0; | |
311 | ||
312 | if (streq(limit, "infinity")) { | |
313 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", (uint64_t)-1); | |
d750dde2 LP |
314 | if (r < 0) |
315 | return pam_bus_log_create_error(handle, r); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | r = parse_permille(limit); | |
321 | if (r >= 0) { | |
322 | r = sd_bus_message_append(m, "(sv)", "MemoryMaxScale", "u", (uint32_t) (((uint64_t) r * UINT32_MAX) / 1000U)); | |
323 | if (r < 0) | |
324 | return pam_bus_log_create_error(handle, r); | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | r = parse_size(limit, 1024, &val); | |
330 | if (r >= 0) { | |
331 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", val); | |
332 | if (r < 0) | |
333 | return pam_bus_log_create_error(handle, r); | |
334 | ||
335 | return 0; | |
22f93314 JS |
336 | } |
337 | ||
d750dde2 | 338 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.memory_max, ignoring: %s", limit); |
22f93314 JS |
339 | return 0; |
340 | } | |
341 | ||
adc09af2 PW |
342 | static int append_session_runtime_max_sec(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
343 | usec_t val; | |
344 | int r; | |
345 | ||
346 | /* No need to parse "infinity" here, it will be set by default later in scope_init() */ | |
347 | if (isempty(limit) || streq(limit, "infinity")) | |
348 | return 0; | |
349 | ||
350 | r = parse_sec(limit, &val); | |
351 | if (r >= 0) { | |
352 | r = sd_bus_message_append(m, "(sv)", "RuntimeMaxUSec", "t", (uint64_t) val); | |
353 | if (r < 0) { | |
354 | pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror_safe(r)); | |
355 | return r; | |
356 | } | |
357 | } else | |
358 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.runtime_max_sec: %s, ignoring.", limit); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
5fdfbbd5 | 363 | static int append_session_tasks_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
22f93314 JS |
364 | uint64_t val; |
365 | int r; | |
366 | ||
367 | /* No need to parse "infinity" here, it will be set unconditionally later in manager_start_scope() */ | |
368 | if (isempty(limit) || streq(limit, "infinity")) | |
369 | return 0; | |
370 | ||
371 | r = safe_atou64(limit, &val); | |
372 | if (r >= 0) { | |
373 | r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", val); | |
d750dde2 LP |
374 | if (r < 0) |
375 | return pam_bus_log_create_error(handle, r); | |
22f93314 | 376 | } else |
d750dde2 | 377 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.tasks_max, ignoring: %s", limit); |
22f93314 JS |
378 | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static int append_session_cg_weight(pam_handle_t *handle, sd_bus_message *m, const char *limit, const char *field) { | |
383 | uint64_t val; | |
384 | int r; | |
385 | ||
36a4dbae LP |
386 | if (isempty(limit)) |
387 | return 0; | |
388 | ||
389 | r = cg_weight_parse(limit, &val); | |
390 | if (r >= 0) { | |
391 | r = sd_bus_message_append(m, "(sv)", field, "t", val); | |
d750dde2 LP |
392 | if (r < 0) |
393 | return pam_bus_log_create_error(handle, r); | |
36a4dbae | 394 | } else if (streq(field, "CPUWeight")) |
d750dde2 | 395 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.cpu_weight, ignoring: %s", limit); |
36a4dbae | 396 | else |
d750dde2 | 397 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.io_weight, ignoring: %s", limit); |
22f93314 JS |
398 | |
399 | return 0; | |
400 | } | |
401 | ||
0ecc1c9d LP |
402 | static const char* getenv_harder(pam_handle_t *handle, const char *key, const char *fallback) { |
403 | const char *v; | |
404 | ||
405 | assert(handle); | |
406 | assert(key); | |
407 | ||
5238e957 | 408 | /* Looks for an environment variable, preferably in the environment block associated with the |
83d4ab55 LP |
409 | * specified PAM handle, falling back to the process' block instead. Why check both? Because we want |
410 | * to permit configuration of session properties from unit files that invoke PAM services, so that | |
411 | * PAM services don't have to be reworked to set systemd-specific properties, but these properties | |
412 | * can still be set from the unit file Environment= block. */ | |
0ecc1c9d LP |
413 | |
414 | v = pam_getenv(handle, key); | |
415 | if (!isempty(v)) | |
416 | return v; | |
417 | ||
83d4ab55 LP |
418 | /* We use secure_getenv() here, since we might get loaded into su/sudo, which are SUID. Ideally |
419 | * they'd clean up the environment before invoking foreign code (such as PAM modules), but alas they | |
420 | * currently don't (to be precise, they clean up the environment they pass to their children, but | |
421 | * not their own environ[]). */ | |
422 | v = secure_getenv(key); | |
0ecc1c9d LP |
423 | if (!isempty(v)) |
424 | return v; | |
425 | ||
426 | return fallback; | |
427 | } | |
428 | ||
d6baaa69 LP |
429 | static int update_environment(pam_handle_t *handle, const char *key, const char *value) { |
430 | int r; | |
431 | ||
432 | assert(handle); | |
433 | assert(key); | |
434 | ||
435 | /* Updates the environment, but only if there's actually a value set. Also, log about errors */ | |
436 | ||
437 | if (isempty(value)) | |
438 | return PAM_SUCCESS; | |
439 | ||
440 | r = pam_misc_setenv(handle, key, value, 0); | |
441 | if (r != PAM_SUCCESS) | |
d9608d40 | 442 | pam_syslog(handle, LOG_ERR, "Failed to set environment variable %s: %s", key, pam_strerror(handle, r)); |
d6baaa69 LP |
443 | |
444 | return r; | |
445 | } | |
446 | ||
b9217112 LP |
447 | static bool validate_runtime_directory(pam_handle_t *handle, const char *path, uid_t uid) { |
448 | struct stat st; | |
449 | ||
dca81e28 | 450 | assert(handle); |
b9217112 LP |
451 | assert(path); |
452 | ||
453 | /* Just some extra paranoia: let's not set $XDG_RUNTIME_DIR if the directory we'd set it to isn't actually set | |
454 | * up properly for us. */ | |
455 | ||
456 | if (lstat(path, &st) < 0) { | |
4bbccb02 | 457 | pam_syslog(handle, LOG_ERR, "Failed to stat() runtime directory '%s': %s", path, strerror_safe(errno)); |
b9217112 LP |
458 | goto fail; |
459 | } | |
460 | ||
461 | if (!S_ISDIR(st.st_mode)) { | |
462 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not actually a directory.", path); | |
463 | goto fail; | |
464 | } | |
465 | ||
466 | if (st.st_uid != uid) { | |
467 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not owned by UID " UID_FMT ", as it should.", path, uid); | |
468 | goto fail; | |
469 | } | |
470 | ||
471 | return true; | |
472 | ||
473 | fail: | |
474 | pam_syslog(handle, LOG_WARNING, "Not setting $XDG_RUNTIME_DIR, as the directory is not in order."); | |
475 | return false; | |
476 | } | |
477 | ||
98a28fef | 478 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
479 | pam_handle_t *handle, |
480 | int flags, | |
481 | int argc, const char **argv) { | |
482 | ||
4afd3348 | 483 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
22f93314 | 484 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; |
d1529c9e | 485 | const char |
9ab0d3eb | 486 | *id, *object_path, *runtime_path, |
d1529c9e LP |
487 | *service = NULL, |
488 | *tty = NULL, *display = NULL, | |
489 | *remote_user = NULL, *remote_host = NULL, | |
490 | *seat = NULL, | |
491 | *type = NULL, *class = NULL, | |
f5cb2820 | 492 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL, *desktop_pam = NULL, |
adc09af2 | 493 | *memory_max = NULL, *tasks_max = NULL, *cpu_weight = NULL, *io_weight = NULL, *runtime_max_sec = NULL; |
4afd3348 | 494 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; |
9ab0d3eb | 495 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL; |
d1529c9e | 496 | int session_fd = -1, existing, r; |
d1529c9e | 497 | bool debug = false, remote; |
baae0358 LP |
498 | uint32_t vtnr = 0; |
499 | uid_t original_uid; | |
8c6db833 | 500 | |
ffcfcb6b | 501 | assert(handle); |
98a28fef | 502 | |
79d860fe MP |
503 | /* Make this a NOP on non-logind systems */ |
504 | if (!logind_running()) | |
8c6db833 LP |
505 | return PAM_SUCCESS; |
506 | ||
e9fbc77c LP |
507 | if (parse_argv(handle, |
508 | argc, argv, | |
fb6becb4 | 509 | &class_pam, |
49ebd11f | 510 | &type_pam, |
f5cb2820 | 511 | &desktop_pam, |
5a330cda ZJS |
512 | &debug) < 0) |
513 | return PAM_SESSION_ERR; | |
74fe1fe3 | 514 | |
baae0358 | 515 | if (debug) |
3831838a | 516 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 517 | |
9ab0d3eb | 518 | r = acquire_user_record(handle, &ur); |
42e66809 | 519 | if (r != PAM_SUCCESS) |
5a330cda | 520 | return r; |
8c6db833 | 521 | |
30b2c336 LP |
522 | /* Make sure we don't enter a loop by talking to |
523 | * systemd-logind when it is actually waiting for the | |
524 | * background to finish start-up. If the service is | |
5c390a4a | 525 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
526 | * leave. */ |
527 | ||
1798f5af | 528 | (void) pam_get_item(handle, PAM_SERVICE, (const void**) &service); |
5c390a4a | 529 | if (streq_ptr(service, "systemd-user")) { |
055c08ef | 530 | char rt[STRLEN("/run/user/") + DECIMAL_STR_MAX(uid_t)]; |
30b2c336 | 531 | |
9ab0d3eb LP |
532 | xsprintf(rt, "/run/user/"UID_FMT, ur->uid); |
533 | if (validate_runtime_directory(handle, rt, ur->uid)) { | |
b9217112 LP |
534 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); |
535 | if (r != PAM_SUCCESS) { | |
d9608d40 | 536 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir: %s", pam_strerror(handle, r)); |
b9217112 LP |
537 | return r; |
538 | } | |
30b2c336 LP |
539 | } |
540 | ||
9ab0d3eb | 541 | r = export_legacy_dbus_address(handle, ur->uid, rt); |
00efd498 ZJS |
542 | if (r != PAM_SUCCESS) |
543 | return r; | |
544 | ||
ffcfcb6b | 545 | return PAM_SUCCESS; |
8c6db833 LP |
546 | } |
547 | ||
ffcfcb6b | 548 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 549 | |
1798f5af LP |
550 | (void) pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
551 | (void) pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
552 | (void) pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
553 | (void) pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 554 | |
0ecc1c9d LP |
555 | seat = getenv_harder(handle, "XDG_SEAT", NULL); |
556 | cvtnr = getenv_harder(handle, "XDG_VTNR", NULL); | |
557 | type = getenv_harder(handle, "XDG_SESSION_TYPE", type_pam); | |
558 | class = getenv_harder(handle, "XDG_SESSION_CLASS", class_pam); | |
f5cb2820 | 559 | desktop = getenv_harder(handle, "XDG_SESSION_DESKTOP", desktop_pam); |
a4cd87e9 | 560 | |
ed18b08b | 561 | tty = strempty(tty); |
98a28fef | 562 | |
ee8545b0 | 563 | if (strchr(tty, ':')) { |
3a736949 LP |
564 | /* A tty with a colon is usually an X11 display, placed there to show up in utmp. We rearrange things |
565 | * and don't pretend that an X display was a tty. */ | |
ee8545b0 LP |
566 | if (isempty(display)) |
567 | display = tty; | |
a4cd87e9 | 568 | tty = NULL; |
3a736949 | 569 | |
1a4459d6 | 570 | } else if (streq(tty, "cron")) { |
3a736949 LP |
571 | /* cron is setting PAM_TTY to "cron" for some reason (the commit carries no information why, but |
572 | * probably because it wants to set it to something as pam_time/pam_access/… require PAM_TTY to be set | |
573 | * (as they otherwise even try to update it!) — but cron doesn't actually allocate a TTY for its forked | |
574 | * off processes.) */ | |
0ad1271f | 575 | type = "unspecified"; |
49ebd11f | 576 | class = "background"; |
a4cd87e9 | 577 | tty = NULL; |
3a736949 | 578 | |
0ad1271f | 579 | } else if (streq(tty, "ssh")) { |
3a736949 LP |
580 | /* ssh has been setting PAM_TTY to "ssh" (for the same reason as cron does this, see above. For further |
581 | * details look for "PAM_TTY_KLUDGE" in the openssh sources). */ | |
0ad1271f | 582 | type ="tty"; |
49ebd11f | 583 | class = "user"; |
3a736949 LP |
584 | tty = NULL; /* This one is particularly sad, as this means that ssh sessions — even though usually |
585 | * associated with a pty — won't be tracked by their tty in logind. This is because ssh | |
586 | * does the PAM session registration early for new connections, and registers a pty only | |
587 | * much later (this is because it doesn't know yet if it needs one at all, as whether to | |
588 | * register a pty or not is negotiated much later in the protocol). */ | |
589 | ||
c9ed61e7 LP |
590 | } else |
591 | /* Chop off leading /dev prefix that some clients specify, but others do not. */ | |
592 | tty = skip_dev_prefix(tty); | |
ee8545b0 | 593 | |
8e7705e5 | 594 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 | 595 | if (!isempty(cvtnr)) |
2ae4842b | 596 | (void) safe_atou32(cvtnr, &vtnr); |
4d6d6518 | 597 | |
92bd5ff3 | 598 | if (!isempty(display) && !vtnr) { |
fc7985ed | 599 | if (isempty(seat)) |
d487e2d6 | 600 | (void) get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 601 | else if (streq(seat, "seat0")) |
d487e2d6 | 602 | (void) get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 603 | } |
4d6d6518 | 604 | |
49ebd11f | 605 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
2675747f LP |
606 | if (debug) |
607 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); | |
d7353ef6 MM |
608 | vtnr = 0; |
609 | } | |
610 | ||
49ebd11f | 611 | if (isempty(type)) |
0ad1271f | 612 | type = !isempty(display) ? "x11" : |
49ebd11f | 613 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 614 | |
55efac6c | 615 | if (isempty(class)) |
e2acb67b | 616 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 617 | |
fecc80c1 | 618 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 619 | |
22f93314 JS |
620 | (void) pam_get_data(handle, "systemd.memory_max", (const void **)&memory_max); |
621 | (void) pam_get_data(handle, "systemd.tasks_max", (const void **)&tasks_max); | |
622 | (void) pam_get_data(handle, "systemd.cpu_weight", (const void **)&cpu_weight); | |
623 | (void) pam_get_data(handle, "systemd.io_weight", (const void **)&io_weight); | |
adc09af2 | 624 | (void) pam_get_data(handle, "systemd.runtime_max_sec", (const void **)&runtime_max_sec); |
22f93314 | 625 | |
4d49b48c | 626 | /* Talk to logind over the message bus */ |
5a330cda | 627 | |
355c9966 LP |
628 | r = pam_acquire_bus_connection(handle, &bus); |
629 | if (r != PAM_SUCCESS) | |
630 | return r; | |
cc377381 | 631 | |
22f93314 | 632 | if (debug) { |
ce959314 | 633 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " |
1fa2f38f | 634 | "uid="UID_FMT" pid="PID_FMT" service=%s type=%s class=%s desktop=%s seat=%s vtnr=%"PRIu32" tty=%s display=%s remote=%s remote_user=%s remote_host=%s", |
9ab0d3eb | 635 | ur->uid, getpid_cached(), |
baae0358 | 636 | strempty(service), |
cda7ecb0 | 637 | type, class, strempty(desktop), |
a4cd87e9 | 638 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 639 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
22f93314 | 640 | pam_syslog(handle, LOG_DEBUG, "Session limits: " |
adc09af2 PW |
641 | "memory_max=%s tasks_max=%s cpu_weight=%s io_weight=%s runtime_max_sec=%s", |
642 | strna(memory_max), strna(tasks_max), strna(cpu_weight), strna(io_weight), strna(runtime_max_sec)); | |
22f93314 JS |
643 | } |
644 | ||
645 | r = sd_bus_message_new_method_call( | |
646 | bus, | |
647 | &m, | |
648 | "org.freedesktop.login1", | |
649 | "/org/freedesktop/login1", | |
650 | "org.freedesktop.login1.Manager", | |
651 | "CreateSession"); | |
d750dde2 LP |
652 | if (r < 0) |
653 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
654 | |
655 | r = sd_bus_message_append(m, "uusssssussbss", | |
9ab0d3eb | 656 | (uint32_t) ur->uid, |
da0da5ec | 657 | 0, |
22f93314 JS |
658 | service, |
659 | type, | |
660 | class, | |
661 | desktop, | |
662 | seat, | |
663 | vtnr, | |
664 | tty, | |
665 | display, | |
666 | remote, | |
667 | remote_user, | |
668 | remote_host); | |
d750dde2 LP |
669 | if (r < 0) |
670 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
671 | |
672 | r = sd_bus_message_open_container(m, 'a', "(sv)"); | |
d750dde2 LP |
673 | if (r < 0) |
674 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
675 | |
676 | r = append_session_memory_max(handle, m, memory_max); | |
677 | if (r < 0) | |
678 | return PAM_SESSION_ERR; | |
679 | ||
adc09af2 PW |
680 | r = append_session_runtime_max_sec(handle, m, runtime_max_sec); |
681 | if (r < 0) | |
682 | return PAM_SESSION_ERR; | |
683 | ||
22f93314 JS |
684 | r = append_session_tasks_max(handle, m, tasks_max); |
685 | if (r < 0) | |
686 | return PAM_SESSION_ERR; | |
687 | ||
688 | r = append_session_cg_weight(handle, m, cpu_weight, "CPUWeight"); | |
689 | if (r < 0) | |
690 | return PAM_SESSION_ERR; | |
691 | ||
692 | r = append_session_cg_weight(handle, m, io_weight, "IOWeight"); | |
693 | if (r < 0) | |
694 | return PAM_SESSION_ERR; | |
695 | ||
696 | r = sd_bus_message_close_container(m); | |
d750dde2 LP |
697 | if (r < 0) |
698 | return pam_bus_log_create_error(handle, r); | |
ce959314 | 699 | |
fbcb6300 | 700 | r = sd_bus_call(bus, m, LOGIN_SLOW_BUS_CALL_TIMEOUT_USEC, &error, &reply); |
ffcfcb6b | 701 | if (r < 0) { |
b80120c4 | 702 | if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { |
2675747f | 703 | if (debug) |
c7e93c4d | 704 | pam_syslog(handle, LOG_DEBUG, "Not creating session: %s", bus_error_message(&error, r)); |
b80120c4 DH |
705 | return PAM_SUCCESS; |
706 | } else { | |
707 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); | |
8d46418e | 708 | return PAM_SESSION_ERR; |
b80120c4 | 709 | } |
98a28fef | 710 | } |
74fe1fe3 | 711 | |
ffcfcb6b | 712 | r = sd_bus_message_read(reply, |
baae0358 | 713 | "soshusub", |
ffcfcb6b ZJS |
714 | &id, |
715 | &object_path, | |
716 | &runtime_path, | |
717 | &session_fd, | |
baae0358 | 718 | &original_uid, |
ffcfcb6b ZJS |
719 | &seat, |
720 | &vtnr, | |
721 | &existing); | |
d750dde2 LP |
722 | if (r < 0) |
723 | return pam_bus_log_parse_error(handle, r); | |
74fe1fe3 | 724 | |
ce959314 MS |
725 | if (debug) |
726 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
baae0358 LP |
727 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", |
728 | id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); | |
ce959314 | 729 | |
d6baaa69 LP |
730 | r = update_environment(handle, "XDG_SESSION_ID", id); |
731 | if (r != PAM_SUCCESS) | |
5a330cda | 732 | return r; |
8c6db833 | 733 | |
9ab0d3eb | 734 | if (original_uid == ur->uid) { |
baae0358 LP |
735 | /* Don't set $XDG_RUNTIME_DIR if the user we now |
736 | * authenticated for does not match the original user | |
737 | * of the session. We do this in order not to result | |
738 | * in privileged apps clobbering the runtime directory | |
739 | * unnecessarily. */ | |
740 | ||
9ab0d3eb | 741 | if (validate_runtime_directory(handle, runtime_path, ur->uid)) { |
b9217112 LP |
742 | r = update_environment(handle, "XDG_RUNTIME_DIR", runtime_path); |
743 | if (r != PAM_SUCCESS) | |
744 | return r; | |
745 | } | |
00efd498 | 746 | |
9ab0d3eb | 747 | r = export_legacy_dbus_address(handle, ur->uid, runtime_path); |
00efd498 ZJS |
748 | if (r != PAM_SUCCESS) |
749 | return r; | |
98a28fef | 750 | } |
8c6db833 | 751 | |
b2f74f07 LP |
752 | /* Most likely we got the session/type/class from environment variables, but might have gotten the data |
753 | * somewhere else (for example PAM module parameters). Let's now update the environment variables, so that this | |
754 | * data is inherited into the session processes, and programs can rely on them to be initialized. */ | |
755 | ||
756 | r = update_environment(handle, "XDG_SESSION_TYPE", type); | |
757 | if (r != PAM_SUCCESS) | |
758 | return r; | |
759 | ||
760 | r = update_environment(handle, "XDG_SESSION_CLASS", class); | |
761 | if (r != PAM_SUCCESS) | |
762 | return r; | |
763 | ||
764 | r = update_environment(handle, "XDG_SESSION_DESKTOP", desktop); | |
765 | if (r != PAM_SUCCESS) | |
766 | return r; | |
767 | ||
d6baaa69 LP |
768 | r = update_environment(handle, "XDG_SEAT", seat); |
769 | if (r != PAM_SUCCESS) | |
770 | return r; | |
bbc73283 LP |
771 | |
772 | if (vtnr > 0) { | |
29d230f6 | 773 | char buf[DECIMAL_STR_MAX(vtnr)]; |
baae0358 | 774 | sprintf(buf, "%u", vtnr); |
bbc73283 | 775 | |
d6baaa69 LP |
776 | r = update_environment(handle, "XDG_VTNR", buf); |
777 | if (r != PAM_SUCCESS) | |
5a330cda | 778 | return r; |
bbc73283 LP |
779 | } |
780 | ||
77085881 LP |
781 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
782 | if (r != PAM_SUCCESS) { | |
d9608d40 | 783 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag: %s", pam_strerror(handle, r)); |
5a330cda | 784 | return r; |
77085881 LP |
785 | } |
786 | ||
21c390cc | 787 | if (session_fd >= 0) { |
85c08dc0 | 788 | session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); |
5a330cda ZJS |
789 | if (session_fd < 0) { |
790 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
791 | return PAM_SESSION_ERR; | |
792 | } | |
793 | ||
23e096cc | 794 | r = pam_set_data(handle, "systemd.session-fd", FD_TO_PTR(session_fd), NULL); |
21c390cc | 795 | if (r != PAM_SUCCESS) { |
d9608d40 | 796 | pam_syslog(handle, LOG_ERR, "Failed to install session fd: %s", pam_strerror(handle, r)); |
03e334a1 | 797 | safe_close(session_fd); |
5a330cda | 798 | return r; |
21c390cc | 799 | } |
98a28fef | 800 | } |
8c6db833 | 801 | |
355c9966 LP |
802 | /* Let's release the D-Bus connection, after all the session might live quite a long time, and we are |
803 | * not going to process the bus connection in that time, so let's better close before the daemon | |
804 | * kicks us off because we are not processing anything. */ | |
805 | (void) pam_release_bus_connection(handle); | |
ffcfcb6b | 806 | return PAM_SUCCESS; |
98a28fef | 807 | } |
8c6db833 | 808 | |
98a28fef LP |
809 | _public_ PAM_EXTERN int pam_sm_close_session( |
810 | pam_handle_t *handle, | |
811 | int flags, | |
812 | int argc, const char **argv) { | |
8c6db833 | 813 | |
5f41d1f1 | 814 | const void *existing = NULL; |
75c8e3cf | 815 | const char *id; |
75c8e3cf | 816 | int r; |
8c6db833 | 817 | |
ffcfcb6b | 818 | assert(handle); |
75c8e3cf | 819 | |
77085881 LP |
820 | /* Only release session if it wasn't pre-existing when we |
821 | * tried to create it */ | |
d487e2d6 | 822 | (void) pam_get_data(handle, "systemd.existing", &existing); |
77085881 | 823 | |
75c8e3cf | 824 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 825 | if (id && !existing) { |
355c9966 LP |
826 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
827 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
75c8e3cf | 828 | |
355c9966 LP |
829 | /* Before we go and close the FIFO we need to tell logind that this is a clean session |
830 | * shutdown, so that it doesn't just go and slaughter us immediately after closing the fd */ | |
75c8e3cf | 831 | |
355c9966 LP |
832 | r = pam_acquire_bus_connection(handle, &bus); |
833 | if (r != PAM_SUCCESS) | |
834 | return r; | |
75c8e3cf | 835 | |
ffcfcb6b ZJS |
836 | r = sd_bus_call_method(bus, |
837 | "org.freedesktop.login1", | |
838 | "/org/freedesktop/login1", | |
839 | "org.freedesktop.login1.Manager", | |
840 | "ReleaseSession", | |
841 | &error, | |
842 | NULL, | |
843 | "s", | |
844 | id); | |
845 | if (r < 0) { | |
5f41d1f1 LP |
846 | pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); |
847 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
848 | } |
849 | } | |
850 | ||
355c9966 LP |
851 | /* Note that we are knowingly leaking the FIFO fd here. This way, logind can watch us die. If we |
852 | * closed it here it would not have any clue when that is completed. Given that one cannot really | |
853 | * have multiple PAM sessions open from the same process this means we will leak one FD at max. */ | |
75c8e3cf | 854 | |
5f41d1f1 | 855 | return PAM_SUCCESS; |
8c6db833 | 856 | } |