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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 | 13 | #include <sys/stat.h> |
e21d9060 | 14 | #include <sys/sysmacros.h> |
ca78ad1d ZJS |
15 | #include <sys/types.h> |
16 | #include <unistd.h> | |
8c6db833 | 17 | |
b5efdb8a | 18 | #include "alloc-util.h" |
430f0182 | 19 | #include "audit-util.h" |
00229fe4 LP |
20 | #include "bus-common-errors.h" |
21 | #include "bus-error.h" | |
47094ce0 | 22 | #include "bus-internal.h" |
9b71e4ab | 23 | #include "bus-locator.h" |
fdb3deca | 24 | #include "cgroup-setup.h" |
4bbccb02 | 25 | #include "errno-util.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
a5c32cff | 27 | #include "fileio.h" |
f97b34a6 | 28 | #include "format-util.h" |
f9c1f4e1 | 29 | #include "fs-util.h" |
958b66ea | 30 | #include "hostname-util.h" |
f9c1f4e1 | 31 | #include "locale-util.h" |
00229fe4 LP |
32 | #include "login-util.h" |
33 | #include "macro.h" | |
d750dde2 | 34 | #include "pam-util.h" |
6bedfcbb | 35 | #include "parse-util.h" |
e37e5ed3 | 36 | #include "path-util.h" |
df0ff127 | 37 | #include "process-util.h" |
f9c1f4e1 | 38 | #include "rlimit-util.h" |
00229fe4 | 39 | #include "socket-util.h" |
055c08ef | 40 | #include "stdio-util.h" |
00229fe4 LP |
41 | #include "strv.h" |
42 | #include "terminal-util.h" | |
9ab0d3eb LP |
43 | #include "user-util.h" |
44 | #include "userdb.h" | |
8c6db833 | 45 | |
fbcb6300 LP |
46 | #define LOGIN_SLOW_BUS_CALL_TIMEOUT_USEC (2*USEC_PER_MINUTE) |
47 | ||
baae0358 LP |
48 | static int parse_argv( |
49 | pam_handle_t *handle, | |
50 | int argc, const char **argv, | |
51 | const char **class, | |
49ebd11f | 52 | const char **type, |
f5cb2820 | 53 | const char **desktop, |
baae0358 | 54 | bool *debug) { |
8c6db833 LP |
55 | |
56 | unsigned i; | |
57 | ||
58 | assert(argc >= 0); | |
59 | assert(argc == 0 || argv); | |
60 | ||
49ebd11f | 61 | for (i = 0; i < (unsigned) argc; i++) { |
d9608d40 LP |
62 | const char *p; |
63 | ||
64 | if ((p = startswith(argv[i], "class="))) { | |
485507b8 | 65 | if (class) |
d9608d40 | 66 | *class = p; |
485507b8 | 67 | |
d9608d40 | 68 | } else if ((p = startswith(argv[i], "type="))) { |
49ebd11f | 69 | if (type) |
d9608d40 | 70 | *type = p; |
49ebd11f | 71 | |
d9608d40 | 72 | } else if ((p = startswith(argv[i], "desktop="))) { |
f5cb2820 | 73 | if (desktop) |
d9608d40 | 74 | *desktop = p; |
f5cb2820 | 75 | |
05a049cc ZJS |
76 | } else if (streq(argv[i], "debug")) { |
77 | if (debug) | |
78 | *debug = true; | |
fb6becb4 | 79 | |
d9608d40 | 80 | } else if ((p = startswith(argv[i], "debug="))) { |
05a049cc | 81 | int k; |
0e318cad | 82 | |
d9608d40 | 83 | k = parse_boolean(p); |
05a049cc | 84 | if (k < 0) |
d9608d40 | 85 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring: %s", p); |
05a049cc | 86 | else if (debug) |
0e318cad MS |
87 | *debug = k; |
88 | ||
05a049cc | 89 | } else |
fb6becb4 | 90 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
49ebd11f | 91 | } |
8c6db833 | 92 | |
8c6db833 LP |
93 | return 0; |
94 | } | |
95 | ||
9ab0d3eb | 96 | static int acquire_user_record( |
8c6db833 | 97 | pam_handle_t *handle, |
9ab0d3eb | 98 | UserRecord **ret_record) { |
8c6db833 | 99 | |
9ab0d3eb LP |
100 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL; |
101 | const char *username = NULL, *json = NULL; | |
dbe7fff4 | 102 | _cleanup_free_ char *field = NULL; |
8c6db833 LP |
103 | int r; |
104 | ||
105 | assert(handle); | |
8c6db833 | 106 | |
baae0358 LP |
107 | r = pam_get_user(handle, &username, NULL); |
108 | if (r != PAM_SUCCESS) { | |
d9608d40 | 109 | pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r)); |
baae0358 LP |
110 | return r; |
111 | } | |
d90b9d27 | 112 | |
baae0358 LP |
113 | if (isempty(username)) { |
114 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
9ab0d3eb | 115 | return PAM_SERVICE_ERR; |
8c6db833 LP |
116 | } |
117 | ||
dbe7fff4 | 118 | /* If pam_systemd_homed (or some other module) already acquired the user record we can reuse it |
9ab0d3eb | 119 | * here. */ |
dbe7fff4 LP |
120 | field = strjoin("systemd-user-record-", username); |
121 | if (!field) | |
122 | return pam_log_oom(handle); | |
9ab0d3eb | 123 | |
dbe7fff4 LP |
124 | r = pam_get_data(handle, field, (const void**) &json); |
125 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
126 | pam_syslog(handle, LOG_ERR, "Failed to get PAM user record data: %s", pam_strerror(handle, r)); | |
127 | return r; | |
128 | } | |
129 | if (r == PAM_SUCCESS && json) { | |
9ab0d3eb LP |
130 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; |
131 | ||
132 | /* Parse cached record */ | |
133 | r = json_parse(json, JSON_PARSE_SENSITIVE, &v, NULL, NULL); | |
134 | if (r < 0) { | |
135 | pam_syslog(handle, LOG_ERR, "Failed to parse JSON user record: %s", strerror_safe(r)); | |
136 | return PAM_SERVICE_ERR; | |
137 | } | |
138 | ||
139 | ur = user_record_new(); | |
140 | if (!ur) | |
141 | return pam_log_oom(handle); | |
142 | ||
143 | r = user_record_load(ur, v, USER_RECORD_LOAD_REFUSE_SECRET); | |
144 | if (r < 0) { | |
145 | pam_syslog(handle, LOG_ERR, "Failed to load user record: %s", strerror_safe(r)); | |
146 | return PAM_SERVICE_ERR; | |
147 | } | |
148 | ||
149 | /* Safety check if cached record actually matches what we are looking for */ | |
150 | if (!streq_ptr(username, ur->user_name)) { | |
151 | pam_syslog(handle, LOG_ERR, "Acquired user record does not match user name."); | |
152 | return PAM_SERVICE_ERR; | |
153 | } | |
dbe7fff4 LP |
154 | } else { |
155 | _cleanup_free_ char *formatted = NULL; | |
156 | ||
157 | /* Request the record ourselves */ | |
158 | r = userdb_by_name(username, 0, &ur); | |
159 | if (r < 0) { | |
160 | pam_syslog(handle, LOG_ERR, "Failed to get user record: %s", strerror_safe(r)); | |
161 | return PAM_USER_UNKNOWN; | |
162 | } | |
163 | ||
164 | r = json_variant_format(ur->json, 0, &formatted); | |
165 | if (r < 0) { | |
166 | pam_syslog(handle, LOG_ERR, "Failed to format user JSON: %s", strerror_safe(r)); | |
167 | return PAM_SERVICE_ERR; | |
168 | } | |
169 | ||
170 | /* And cache it for everyone else */ | |
171 | r = pam_set_data(handle, field, formatted, pam_cleanup_free); | |
172 | if (r < 0) { | |
173 | pam_syslog(handle, LOG_ERR, "Failed to set PAM user record data '%s': %s", | |
174 | field, pam_strerror(handle, r)); | |
175 | return r; | |
176 | } | |
177 | ||
178 | TAKE_PTR(formatted); | |
9ab0d3eb LP |
179 | } |
180 | ||
181 | if (!uid_is_valid(ur->uid)) { | |
182 | pam_syslog(handle, LOG_ERR, "Acquired user record does not have a UID."); | |
183 | return PAM_SERVICE_ERR; | |
8c6db833 LP |
184 | } |
185 | ||
9ab0d3eb LP |
186 | if (ret_record) |
187 | *ret_record = TAKE_PTR(ur); | |
8c6db833 LP |
188 | |
189 | return PAM_SUCCESS; | |
190 | } | |
191 | ||
ecd5f1a9 LP |
192 | static bool display_is_local(const char *display) { |
193 | assert(display); | |
194 | ||
195 | return | |
196 | display[0] == ':' && | |
197 | display[1] >= '0' && | |
198 | display[1] <= '9'; | |
199 | } | |
200 | ||
f7b8b5c4 LP |
201 | static int socket_from_display(const char *display, char **path) { |
202 | size_t k; | |
203 | char *f, *c; | |
204 | ||
205 | assert(display); | |
206 | assert(path); | |
207 | ||
208 | if (!display_is_local(display)) | |
209 | return -EINVAL; | |
210 | ||
211 | k = strspn(display+1, "0123456789"); | |
212 | ||
213 | f = new(char, STRLEN("/tmp/.X11-unix/X") + k + 1); | |
214 | if (!f) | |
215 | return -ENOMEM; | |
216 | ||
217 | c = stpcpy(f, "/tmp/.X11-unix/X"); | |
218 | memcpy(c, display+1, k); | |
219 | c[k] = 0; | |
220 | ||
221 | *path = f; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
4d6d6518 | 226 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
f36a9d59 ZJS |
227 | union sockaddr_union sa; |
228 | socklen_t sa_len; | |
e21d9060 | 229 | _cleanup_free_ char *p = NULL, *sys_path = NULL, *tty = NULL; |
baae0358 | 230 | _cleanup_close_ int fd = -1; |
4d6d6518 | 231 | struct ucred ucred; |
f36a9d59 | 232 | int v, r; |
e21d9060 | 233 | dev_t display_ctty; |
4d6d6518 LP |
234 | |
235 | assert(display); | |
4d6d6518 LP |
236 | assert(vtnr); |
237 | ||
238 | /* We deduce the X11 socket from the display name, then use | |
239 | * SO_PEERCRED to determine the X11 server process, ask for | |
240 | * the controlling tty of that and if it's a VC then we know | |
241 | * the seat and the virtual terminal. Sounds ugly, is only | |
242 | * semi-ugly. */ | |
243 | ||
244 | r = socket_from_display(display, &p); | |
245 | if (r < 0) | |
246 | return r; | |
f36a9d59 ZJS |
247 | r = sockaddr_un_set_path(&sa.un, p); |
248 | if (r < 0) | |
249 | return r; | |
250 | sa_len = r; | |
4d6d6518 LP |
251 | |
252 | fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); | |
b92bea5d | 253 | if (fd < 0) |
4d6d6518 | 254 | return -errno; |
4d6d6518 | 255 | |
f36a9d59 | 256 | if (connect(fd, &sa.sa, sa_len) < 0) |
4d6d6518 | 257 | return -errno; |
4d6d6518 | 258 | |
eff05270 | 259 | r = getpeercred(fd, &ucred); |
4d6d6518 | 260 | if (r < 0) |
eff05270 | 261 | return r; |
4d6d6518 | 262 | |
e21d9060 TM |
263 | r = get_ctty_devnr(ucred.pid, &display_ctty); |
264 | if (r < 0) | |
265 | return r; | |
266 | ||
267 | if (asprintf(&sys_path, "/sys/dev/char/%d:%d", major(display_ctty), minor(display_ctty)) < 0) | |
268 | return -ENOMEM; | |
269 | r = readlink_value(sys_path, &tty); | |
4d6d6518 LP |
270 | if (r < 0) |
271 | return r; | |
272 | ||
273 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
274 | if (v < 0) |
275 | return v; | |
276 | else if (v == 0) | |
277 | return -ENOENT; | |
278 | ||
fc7985ed LP |
279 | if (seat) |
280 | *seat = "seat0"; | |
4d6d6518 LP |
281 | *vtnr = (uint32_t) v; |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
00efd498 ZJS |
286 | static int export_legacy_dbus_address( |
287 | pam_handle_t *handle, | |
00efd498 ZJS |
288 | const char *runtime) { |
289 | ||
15ee6c20 ZJS |
290 | const char *s; |
291 | _cleanup_free_ char *t = NULL; | |
00efd498 ZJS |
292 | int r = PAM_BUF_ERR; |
293 | ||
15ee6c20 ZJS |
294 | /* We need to export $DBUS_SESSION_BUS_ADDRESS because various applications will not connect |
295 | * correctly to the bus without it. This setting matches what dbus.socket does for the user | |
296 | * session using 'systemctl --user set-environment'. We want to have the same configuration | |
297 | * in processes started from the PAM session. | |
298 | * | |
299 | * The setting of the address is guarded by the access() check because it is also possible to compile | |
300 | * dbus without --enable-user-session, in which case this socket is not used, and | |
301 | * $DBUS_SESSION_BUS_ADDRESS should not be set. An alternative approach would to not do the access() | |
302 | * check here, and let applications try on their own, by using "unix:path=%s/bus;autolaunch:". But we | |
303 | * expect the socket to be present by the time we do this check, so we can just as well check once | |
304 | * here. */ | |
305 | ||
306 | s = strjoina(runtime, "/bus"); | |
307 | if (access(s, F_OK) < 0) | |
308 | return PAM_SUCCESS; | |
309 | ||
310 | if (asprintf(&t, DEFAULT_USER_BUS_ADDRESS_FMT, runtime) < 0) | |
d750dde2 | 311 | return pam_log_oom(handle); |
00efd498 | 312 | |
15ee6c20 | 313 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", t, 0); |
d750dde2 LP |
314 | if (r != PAM_SUCCESS) { |
315 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable: %s", pam_strerror(handle, r)); | |
316 | return r; | |
317 | } | |
00efd498 ZJS |
318 | |
319 | return PAM_SUCCESS; | |
00efd498 ZJS |
320 | } |
321 | ||
22f93314 JS |
322 | static int append_session_memory_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
323 | uint64_t val; | |
324 | int r; | |
325 | ||
326 | if (isempty(limit)) | |
7bfbf6cc | 327 | return PAM_SUCCESS; |
22f93314 JS |
328 | |
329 | if (streq(limit, "infinity")) { | |
330 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", (uint64_t)-1); | |
d750dde2 LP |
331 | if (r < 0) |
332 | return pam_bus_log_create_error(handle, r); | |
333 | ||
7bfbf6cc | 334 | return PAM_SUCCESS; |
d750dde2 LP |
335 | } |
336 | ||
337 | r = parse_permille(limit); | |
338 | if (r >= 0) { | |
339 | r = sd_bus_message_append(m, "(sv)", "MemoryMaxScale", "u", (uint32_t) (((uint64_t) r * UINT32_MAX) / 1000U)); | |
340 | if (r < 0) | |
341 | return pam_bus_log_create_error(handle, r); | |
342 | ||
7bfbf6cc | 343 | return PAM_SUCCESS; |
d750dde2 LP |
344 | } |
345 | ||
346 | r = parse_size(limit, 1024, &val); | |
347 | if (r >= 0) { | |
348 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", val); | |
349 | if (r < 0) | |
350 | return pam_bus_log_create_error(handle, r); | |
351 | ||
7bfbf6cc | 352 | return PAM_SUCCESS; |
22f93314 JS |
353 | } |
354 | ||
d750dde2 | 355 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.memory_max, ignoring: %s", limit); |
7bfbf6cc | 356 | return PAM_SUCCESS; |
22f93314 JS |
357 | } |
358 | ||
adc09af2 PW |
359 | static int append_session_runtime_max_sec(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
360 | usec_t val; | |
361 | int r; | |
362 | ||
363 | /* No need to parse "infinity" here, it will be set by default later in scope_init() */ | |
364 | if (isempty(limit) || streq(limit, "infinity")) | |
7bfbf6cc | 365 | return PAM_SUCCESS; |
adc09af2 PW |
366 | |
367 | r = parse_sec(limit, &val); | |
368 | if (r >= 0) { | |
369 | r = sd_bus_message_append(m, "(sv)", "RuntimeMaxUSec", "t", (uint64_t) val); | |
7bfbf6cc LP |
370 | if (r < 0) |
371 | return pam_bus_log_create_error(handle, r); | |
adc09af2 PW |
372 | } else |
373 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.runtime_max_sec: %s, ignoring.", limit); | |
374 | ||
7bfbf6cc | 375 | return PAM_SUCCESS; |
adc09af2 PW |
376 | } |
377 | ||
5fdfbbd5 | 378 | static int append_session_tasks_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
22f93314 JS |
379 | uint64_t val; |
380 | int r; | |
381 | ||
382 | /* No need to parse "infinity" here, it will be set unconditionally later in manager_start_scope() */ | |
383 | if (isempty(limit) || streq(limit, "infinity")) | |
7bfbf6cc | 384 | return PAM_SUCCESS; |
22f93314 JS |
385 | |
386 | r = safe_atou64(limit, &val); | |
387 | if (r >= 0) { | |
388 | r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", val); | |
d750dde2 LP |
389 | if (r < 0) |
390 | return pam_bus_log_create_error(handle, r); | |
22f93314 | 391 | } else |
d750dde2 | 392 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.tasks_max, ignoring: %s", limit); |
22f93314 | 393 | |
7bfbf6cc | 394 | return PAM_SUCCESS; |
22f93314 JS |
395 | } |
396 | ||
397 | static int append_session_cg_weight(pam_handle_t *handle, sd_bus_message *m, const char *limit, const char *field) { | |
398 | uint64_t val; | |
399 | int r; | |
400 | ||
36a4dbae | 401 | if (isempty(limit)) |
7bfbf6cc | 402 | return PAM_SUCCESS; |
36a4dbae LP |
403 | |
404 | r = cg_weight_parse(limit, &val); | |
405 | if (r >= 0) { | |
406 | r = sd_bus_message_append(m, "(sv)", field, "t", val); | |
d750dde2 LP |
407 | if (r < 0) |
408 | return pam_bus_log_create_error(handle, r); | |
36a4dbae | 409 | } else if (streq(field, "CPUWeight")) |
d750dde2 | 410 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.cpu_weight, ignoring: %s", limit); |
36a4dbae | 411 | else |
d750dde2 | 412 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.io_weight, ignoring: %s", limit); |
22f93314 | 413 | |
7bfbf6cc | 414 | return PAM_SUCCESS; |
22f93314 JS |
415 | } |
416 | ||
0ecc1c9d LP |
417 | static const char* getenv_harder(pam_handle_t *handle, const char *key, const char *fallback) { |
418 | const char *v; | |
419 | ||
420 | assert(handle); | |
421 | assert(key); | |
422 | ||
5238e957 | 423 | /* Looks for an environment variable, preferably in the environment block associated with the |
83d4ab55 LP |
424 | * specified PAM handle, falling back to the process' block instead. Why check both? Because we want |
425 | * to permit configuration of session properties from unit files that invoke PAM services, so that | |
426 | * PAM services don't have to be reworked to set systemd-specific properties, but these properties | |
427 | * can still be set from the unit file Environment= block. */ | |
0ecc1c9d LP |
428 | |
429 | v = pam_getenv(handle, key); | |
430 | if (!isempty(v)) | |
431 | return v; | |
432 | ||
83d4ab55 LP |
433 | /* We use secure_getenv() here, since we might get loaded into su/sudo, which are SUID. Ideally |
434 | * they'd clean up the environment before invoking foreign code (such as PAM modules), but alas they | |
435 | * currently don't (to be precise, they clean up the environment they pass to their children, but | |
436 | * not their own environ[]). */ | |
437 | v = secure_getenv(key); | |
0ecc1c9d LP |
438 | if (!isempty(v)) |
439 | return v; | |
440 | ||
441 | return fallback; | |
442 | } | |
443 | ||
d6baaa69 LP |
444 | static int update_environment(pam_handle_t *handle, const char *key, const char *value) { |
445 | int r; | |
446 | ||
447 | assert(handle); | |
448 | assert(key); | |
449 | ||
450 | /* Updates the environment, but only if there's actually a value set. Also, log about errors */ | |
451 | ||
452 | if (isempty(value)) | |
453 | return PAM_SUCCESS; | |
454 | ||
455 | r = pam_misc_setenv(handle, key, value, 0); | |
456 | if (r != PAM_SUCCESS) | |
d9608d40 | 457 | pam_syslog(handle, LOG_ERR, "Failed to set environment variable %s: %s", key, pam_strerror(handle, r)); |
d6baaa69 LP |
458 | |
459 | return r; | |
460 | } | |
461 | ||
b9217112 LP |
462 | static bool validate_runtime_directory(pam_handle_t *handle, const char *path, uid_t uid) { |
463 | struct stat st; | |
464 | ||
dca81e28 | 465 | assert(handle); |
b9217112 LP |
466 | assert(path); |
467 | ||
e0d70f76 LP |
468 | /* Some extra paranoia: let's not set $XDG_RUNTIME_DIR if the directory we'd set it to isn't actually |
469 | * set up properly for us. This is supposed to provide a careful safety net for supporting su/sudo | |
470 | * type transitions: in that case the UID changes, but the session and thus the user owning it | |
15e6a6e8 | 471 | * doesn't change. Since the $XDG_RUNTIME_DIR lifecycle is bound to the session's user being logged |
e0d70f76 LP |
472 | * in at least once we should be particularly careful when setting the environment variable, since |
473 | * otherwise we might end up setting $XDG_RUNTIME_DIR to some directory owned by the wrong user. */ | |
b9217112 | 474 | |
6d06dfad LP |
475 | if (!path_is_absolute(path)) { |
476 | pam_syslog(handle, LOG_ERR, "Provided runtime directory '%s' is not absolute.", path); | |
477 | goto fail; | |
478 | } | |
479 | ||
b9217112 | 480 | if (lstat(path, &st) < 0) { |
4bbccb02 | 481 | pam_syslog(handle, LOG_ERR, "Failed to stat() runtime directory '%s': %s", path, strerror_safe(errno)); |
b9217112 LP |
482 | goto fail; |
483 | } | |
484 | ||
485 | if (!S_ISDIR(st.st_mode)) { | |
486 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not actually a directory.", path); | |
487 | goto fail; | |
488 | } | |
489 | ||
490 | if (st.st_uid != uid) { | |
491 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not owned by UID " UID_FMT ", as it should.", path, uid); | |
492 | goto fail; | |
493 | } | |
494 | ||
495 | return true; | |
496 | ||
497 | fail: | |
498 | pam_syslog(handle, LOG_WARNING, "Not setting $XDG_RUNTIME_DIR, as the directory is not in order."); | |
499 | return false; | |
500 | } | |
501 | ||
f9c1f4e1 LP |
502 | static int pam_putenv_and_log(pam_handle_t *handle, const char *e, bool debug) { |
503 | int r; | |
504 | ||
505 | assert(handle); | |
506 | assert(e); | |
507 | ||
508 | r = pam_putenv(handle, e); | |
509 | if (r != PAM_SUCCESS) { | |
510 | pam_syslog(handle, LOG_ERR, "Failed to set PAM environment variable %s: %s", e, pam_strerror(handle, r)); | |
511 | return r; | |
512 | } | |
513 | ||
514 | if (debug) | |
515 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable %s set based on user record.", e); | |
516 | ||
517 | return PAM_SUCCESS; | |
518 | } | |
519 | ||
520 | static int apply_user_record_settings(pam_handle_t *handle, UserRecord *ur, bool debug) { | |
521 | char **i; | |
522 | int r; | |
523 | ||
524 | assert(handle); | |
525 | assert(ur); | |
526 | ||
527 | if (ur->umask != MODE_INVALID) { | |
528 | umask(ur->umask); | |
529 | ||
530 | if (debug) | |
531 | pam_syslog(handle, LOG_DEBUG, "Set user umask to %04o based on user record.", ur->umask); | |
532 | } | |
533 | ||
534 | STRV_FOREACH(i, ur->environment) { | |
535 | _cleanup_free_ char *n = NULL; | |
536 | const char *e; | |
537 | ||
538 | assert_se(e = strchr(*i, '=')); /* environment was already validated while parsing JSON record, this thus must hold */ | |
539 | ||
540 | n = strndup(*i, e - *i); | |
541 | if (!n) | |
542 | return pam_log_oom(handle); | |
543 | ||
544 | if (pam_getenv(handle, n)) { | |
545 | if (debug) | |
546 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable $%s already set, not changing based on record.", *i); | |
547 | continue; | |
548 | } | |
549 | ||
550 | r = pam_putenv_and_log(handle, *i, debug); | |
551 | if (r != PAM_SUCCESS) | |
552 | return r; | |
553 | } | |
554 | ||
555 | if (ur->email_address) { | |
556 | if (pam_getenv(handle, "EMAIL")) { | |
557 | if (debug) | |
558 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable $EMAIL already set, not changing based on user record."); | |
559 | } else { | |
560 | _cleanup_free_ char *joined = NULL; | |
561 | ||
562 | joined = strjoin("EMAIL=", ur->email_address); | |
563 | if (!joined) | |
564 | return pam_log_oom(handle); | |
565 | ||
566 | r = pam_putenv_and_log(handle, joined, debug); | |
567 | if (r != PAM_SUCCESS) | |
568 | return r; | |
569 | } | |
570 | } | |
571 | ||
572 | if (ur->time_zone) { | |
573 | if (pam_getenv(handle, "TZ")) { | |
574 | if (debug) | |
575 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable $TZ already set, not changing based on user record."); | |
576 | } else if (!timezone_is_valid(ur->time_zone, LOG_DEBUG)) { | |
577 | if (debug) | |
578 | pam_syslog(handle, LOG_DEBUG, "Time zone specified in user record is not valid locally, not setting $TZ."); | |
579 | } else { | |
580 | _cleanup_free_ char *joined = NULL; | |
581 | ||
582 | joined = strjoin("TZ=:", ur->time_zone); | |
583 | if (!joined) | |
584 | return pam_log_oom(handle); | |
585 | ||
586 | r = pam_putenv_and_log(handle, joined, debug); | |
587 | if (r != PAM_SUCCESS) | |
588 | return r; | |
589 | } | |
590 | } | |
591 | ||
592 | if (ur->preferred_language) { | |
593 | if (pam_getenv(handle, "LANG")) { | |
594 | if (debug) | |
595 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable $LANG already set, not changing based on user record."); | |
a00a78b8 | 596 | } else if (locale_is_installed(ur->preferred_language) <= 0) { |
f9c1f4e1 | 597 | if (debug) |
a00a78b8 | 598 | pam_syslog(handle, LOG_DEBUG, "Preferred language specified in user record is not valid or not installed, not setting $LANG."); |
f9c1f4e1 LP |
599 | } else { |
600 | _cleanup_free_ char *joined = NULL; | |
601 | ||
602 | joined = strjoin("LANG=", ur->preferred_language); | |
603 | if (!joined) | |
604 | return pam_log_oom(handle); | |
605 | ||
606 | r = pam_putenv_and_log(handle, joined, debug); | |
607 | if (r != PAM_SUCCESS) | |
608 | return r; | |
609 | } | |
610 | } | |
611 | ||
612 | if (nice_is_valid(ur->nice_level)) { | |
613 | if (nice(ur->nice_level) < 0) | |
614 | pam_syslog(handle, LOG_ERR, "Failed to set nice level to %i, ignoring: %s", ur->nice_level, strerror_safe(errno)); | |
615 | else if (debug) | |
616 | pam_syslog(handle, LOG_DEBUG, "Nice level set, based on user record."); | |
617 | } | |
618 | ||
619 | for (int rl = 0; rl < _RLIMIT_MAX; rl++) { | |
620 | ||
621 | if (!ur->rlimits[rl]) | |
622 | continue; | |
623 | ||
624 | r = setrlimit_closest(rl, ur->rlimits[rl]); | |
625 | if (r < 0) | |
626 | pam_syslog(handle, LOG_ERR, "Failed to set resource limit %s, ignoring: %s", rlimit_to_string(rl), strerror_safe(r)); | |
627 | else if (debug) | |
628 | pam_syslog(handle, LOG_DEBUG, "Resource limit %s set, based on user record.", rlimit_to_string(rl)); | |
629 | } | |
630 | ||
631 | return PAM_SUCCESS; | |
632 | } | |
633 | ||
e0d70f76 LP |
634 | static int configure_runtime_directory( |
635 | pam_handle_t *handle, | |
636 | UserRecord *ur, | |
637 | const char *rt) { | |
638 | ||
639 | int r; | |
640 | ||
641 | assert(handle); | |
642 | assert(ur); | |
643 | assert(rt); | |
644 | ||
645 | if (!validate_runtime_directory(handle, rt, ur->uid)) | |
646 | return PAM_SUCCESS; | |
647 | ||
648 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); | |
649 | if (r != PAM_SUCCESS) { | |
650 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir: %s", pam_strerror(handle, r)); | |
651 | return r; | |
652 | } | |
653 | ||
654 | return export_legacy_dbus_address(handle, rt); | |
655 | } | |
656 | ||
98a28fef | 657 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
658 | pam_handle_t *handle, |
659 | int flags, | |
660 | int argc, const char **argv) { | |
661 | ||
4afd3348 | 662 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
22f93314 | 663 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; |
d1529c9e | 664 | const char |
9ab0d3eb | 665 | *id, *object_path, *runtime_path, |
d1529c9e LP |
666 | *service = NULL, |
667 | *tty = NULL, *display = NULL, | |
668 | *remote_user = NULL, *remote_host = NULL, | |
669 | *seat = NULL, | |
670 | *type = NULL, *class = NULL, | |
f5cb2820 | 671 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL, *desktop_pam = NULL, |
adc09af2 | 672 | *memory_max = NULL, *tasks_max = NULL, *cpu_weight = NULL, *io_weight = NULL, *runtime_max_sec = NULL; |
4afd3348 | 673 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; |
9ab0d3eb | 674 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL; |
d1529c9e | 675 | int session_fd = -1, existing, r; |
d1529c9e | 676 | bool debug = false, remote; |
baae0358 LP |
677 | uint32_t vtnr = 0; |
678 | uid_t original_uid; | |
8c6db833 | 679 | |
ffcfcb6b | 680 | assert(handle); |
98a28fef | 681 | |
e9fbc77c LP |
682 | if (parse_argv(handle, |
683 | argc, argv, | |
fb6becb4 | 684 | &class_pam, |
49ebd11f | 685 | &type_pam, |
f5cb2820 | 686 | &desktop_pam, |
5a330cda ZJS |
687 | &debug) < 0) |
688 | return PAM_SESSION_ERR; | |
74fe1fe3 | 689 | |
baae0358 | 690 | if (debug) |
3831838a | 691 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 692 | |
9ab0d3eb | 693 | r = acquire_user_record(handle, &ur); |
42e66809 | 694 | if (r != PAM_SUCCESS) |
5a330cda | 695 | return r; |
8c6db833 | 696 | |
e945dd9e LP |
697 | /* Make most of this a NOP on non-logind systems */ |
698 | if (!logind_running()) | |
699 | goto success; | |
700 | ||
30b2c336 LP |
701 | /* Make sure we don't enter a loop by talking to |
702 | * systemd-logind when it is actually waiting for the | |
703 | * background to finish start-up. If the service is | |
5c390a4a | 704 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
705 | * leave. */ |
706 | ||
1798f5af | 707 | (void) pam_get_item(handle, PAM_SERVICE, (const void**) &service); |
5c390a4a | 708 | if (streq_ptr(service, "systemd-user")) { |
055c08ef | 709 | char rt[STRLEN("/run/user/") + DECIMAL_STR_MAX(uid_t)]; |
30b2c336 | 710 | |
9ab0d3eb | 711 | xsprintf(rt, "/run/user/"UID_FMT, ur->uid); |
e0d70f76 | 712 | r = configure_runtime_directory(handle, ur, rt); |
00efd498 ZJS |
713 | if (r != PAM_SUCCESS) |
714 | return r; | |
715 | ||
e945dd9e | 716 | goto success; |
8c6db833 LP |
717 | } |
718 | ||
ffcfcb6b | 719 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 720 | |
1798f5af LP |
721 | (void) pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
722 | (void) pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
723 | (void) pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
724 | (void) pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
a8573ccc | 725 | |
0ecc1c9d LP |
726 | seat = getenv_harder(handle, "XDG_SEAT", NULL); |
727 | cvtnr = getenv_harder(handle, "XDG_VTNR", NULL); | |
728 | type = getenv_harder(handle, "XDG_SESSION_TYPE", type_pam); | |
729 | class = getenv_harder(handle, "XDG_SESSION_CLASS", class_pam); | |
f5cb2820 | 730 | desktop = getenv_harder(handle, "XDG_SESSION_DESKTOP", desktop_pam); |
a4cd87e9 | 731 | |
ed18b08b | 732 | tty = strempty(tty); |
98a28fef | 733 | |
ee8545b0 | 734 | if (strchr(tty, ':')) { |
3a736949 LP |
735 | /* A tty with a colon is usually an X11 display, placed there to show up in utmp. We rearrange things |
736 | * and don't pretend that an X display was a tty. */ | |
ee8545b0 LP |
737 | if (isempty(display)) |
738 | display = tty; | |
a4cd87e9 | 739 | tty = NULL; |
3a736949 | 740 | |
1a4459d6 | 741 | } else if (streq(tty, "cron")) { |
3a736949 LP |
742 | /* cron is setting PAM_TTY to "cron" for some reason (the commit carries no information why, but |
743 | * probably because it wants to set it to something as pam_time/pam_access/… require PAM_TTY to be set | |
744 | * (as they otherwise even try to update it!) — but cron doesn't actually allocate a TTY for its forked | |
745 | * off processes.) */ | |
0ad1271f | 746 | type = "unspecified"; |
49ebd11f | 747 | class = "background"; |
a4cd87e9 | 748 | tty = NULL; |
3a736949 | 749 | |
0ad1271f | 750 | } else if (streq(tty, "ssh")) { |
3a736949 LP |
751 | /* ssh has been setting PAM_TTY to "ssh" (for the same reason as cron does this, see above. For further |
752 | * details look for "PAM_TTY_KLUDGE" in the openssh sources). */ | |
0ad1271f | 753 | type ="tty"; |
49ebd11f | 754 | class = "user"; |
3a736949 LP |
755 | tty = NULL; /* This one is particularly sad, as this means that ssh sessions — even though usually |
756 | * associated with a pty — won't be tracked by their tty in logind. This is because ssh | |
757 | * does the PAM session registration early for new connections, and registers a pty only | |
758 | * much later (this is because it doesn't know yet if it needs one at all, as whether to | |
759 | * register a pty or not is negotiated much later in the protocol). */ | |
760 | ||
c9ed61e7 LP |
761 | } else |
762 | /* Chop off leading /dev prefix that some clients specify, but others do not. */ | |
763 | tty = skip_dev_prefix(tty); | |
ee8545b0 | 764 | |
8e7705e5 | 765 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 | 766 | if (!isempty(cvtnr)) |
2ae4842b | 767 | (void) safe_atou32(cvtnr, &vtnr); |
4d6d6518 | 768 | |
92bd5ff3 | 769 | if (!isempty(display) && !vtnr) { |
fc7985ed | 770 | if (isempty(seat)) |
d487e2d6 | 771 | (void) get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 772 | else if (streq(seat, "seat0")) |
d487e2d6 | 773 | (void) get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 774 | } |
4d6d6518 | 775 | |
49ebd11f | 776 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
2675747f LP |
777 | if (debug) |
778 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); | |
d7353ef6 MM |
779 | vtnr = 0; |
780 | } | |
781 | ||
49ebd11f | 782 | if (isempty(type)) |
0ad1271f | 783 | type = !isempty(display) ? "x11" : |
49ebd11f | 784 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 785 | |
55efac6c | 786 | if (isempty(class)) |
e2acb67b | 787 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 788 | |
fecc80c1 | 789 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 790 | |
22f93314 JS |
791 | (void) pam_get_data(handle, "systemd.memory_max", (const void **)&memory_max); |
792 | (void) pam_get_data(handle, "systemd.tasks_max", (const void **)&tasks_max); | |
793 | (void) pam_get_data(handle, "systemd.cpu_weight", (const void **)&cpu_weight); | |
794 | (void) pam_get_data(handle, "systemd.io_weight", (const void **)&io_weight); | |
adc09af2 | 795 | (void) pam_get_data(handle, "systemd.runtime_max_sec", (const void **)&runtime_max_sec); |
22f93314 | 796 | |
4d49b48c | 797 | /* Talk to logind over the message bus */ |
5a330cda | 798 | |
355c9966 LP |
799 | r = pam_acquire_bus_connection(handle, &bus); |
800 | if (r != PAM_SUCCESS) | |
801 | return r; | |
cc377381 | 802 | |
22f93314 | 803 | if (debug) { |
ce959314 | 804 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " |
1fa2f38f | 805 | "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 | 806 | ur->uid, getpid_cached(), |
baae0358 | 807 | strempty(service), |
cda7ecb0 | 808 | type, class, strempty(desktop), |
a4cd87e9 | 809 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 810 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
22f93314 | 811 | pam_syslog(handle, LOG_DEBUG, "Session limits: " |
adc09af2 PW |
812 | "memory_max=%s tasks_max=%s cpu_weight=%s io_weight=%s runtime_max_sec=%s", |
813 | strna(memory_max), strna(tasks_max), strna(cpu_weight), strna(io_weight), strna(runtime_max_sec)); | |
22f93314 JS |
814 | } |
815 | ||
5d990cc5 | 816 | r = bus_message_new_method_call(bus, &m, bus_login_mgr, "CreateSession"); |
d750dde2 LP |
817 | if (r < 0) |
818 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
819 | |
820 | r = sd_bus_message_append(m, "uusssssussbss", | |
9ab0d3eb | 821 | (uint32_t) ur->uid, |
da0da5ec | 822 | 0, |
22f93314 JS |
823 | service, |
824 | type, | |
825 | class, | |
826 | desktop, | |
827 | seat, | |
828 | vtnr, | |
829 | tty, | |
830 | display, | |
831 | remote, | |
832 | remote_user, | |
833 | remote_host); | |
d750dde2 LP |
834 | if (r < 0) |
835 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
836 | |
837 | r = sd_bus_message_open_container(m, 'a', "(sv)"); | |
d750dde2 LP |
838 | if (r < 0) |
839 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
840 | |
841 | r = append_session_memory_max(handle, m, memory_max); | |
7bfbf6cc LP |
842 | if (r != PAM_SUCCESS) |
843 | return r; | |
22f93314 | 844 | |
adc09af2 | 845 | r = append_session_runtime_max_sec(handle, m, runtime_max_sec); |
7bfbf6cc LP |
846 | if (r != PAM_SUCCESS) |
847 | return r; | |
adc09af2 | 848 | |
22f93314 | 849 | r = append_session_tasks_max(handle, m, tasks_max); |
7bfbf6cc LP |
850 | if (r != PAM_SUCCESS) |
851 | return r; | |
22f93314 JS |
852 | |
853 | r = append_session_cg_weight(handle, m, cpu_weight, "CPUWeight"); | |
7bfbf6cc LP |
854 | if (r != PAM_SUCCESS) |
855 | return r; | |
22f93314 JS |
856 | |
857 | r = append_session_cg_weight(handle, m, io_weight, "IOWeight"); | |
7bfbf6cc LP |
858 | if (r != PAM_SUCCESS) |
859 | return r; | |
22f93314 JS |
860 | |
861 | r = sd_bus_message_close_container(m); | |
d750dde2 LP |
862 | if (r < 0) |
863 | return pam_bus_log_create_error(handle, r); | |
ce959314 | 864 | |
fbcb6300 | 865 | r = sd_bus_call(bus, m, LOGIN_SLOW_BUS_CALL_TIMEOUT_USEC, &error, &reply); |
ffcfcb6b | 866 | if (r < 0) { |
b80120c4 | 867 | if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { |
2675747f | 868 | if (debug) |
c7e93c4d | 869 | pam_syslog(handle, LOG_DEBUG, "Not creating session: %s", bus_error_message(&error, r)); |
e945dd9e LP |
870 | |
871 | /* We are already in a session, don't do anything */ | |
872 | goto success; | |
b80120c4 DH |
873 | } else { |
874 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); | |
8d46418e | 875 | return PAM_SESSION_ERR; |
b80120c4 | 876 | } |
98a28fef | 877 | } |
74fe1fe3 | 878 | |
ffcfcb6b | 879 | r = sd_bus_message_read(reply, |
baae0358 | 880 | "soshusub", |
ffcfcb6b ZJS |
881 | &id, |
882 | &object_path, | |
883 | &runtime_path, | |
884 | &session_fd, | |
baae0358 | 885 | &original_uid, |
ffcfcb6b ZJS |
886 | &seat, |
887 | &vtnr, | |
888 | &existing); | |
d750dde2 LP |
889 | if (r < 0) |
890 | return pam_bus_log_parse_error(handle, r); | |
74fe1fe3 | 891 | |
ce959314 MS |
892 | if (debug) |
893 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
baae0358 LP |
894 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", |
895 | id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); | |
ce959314 | 896 | |
d6baaa69 LP |
897 | r = update_environment(handle, "XDG_SESSION_ID", id); |
898 | if (r != PAM_SUCCESS) | |
5a330cda | 899 | return r; |
8c6db833 | 900 | |
9ab0d3eb | 901 | if (original_uid == ur->uid) { |
e0d70f76 LP |
902 | /* Don't set $XDG_RUNTIME_DIR if the user we now authenticated for does not match the |
903 | * original user of the session. We do this in order not to result in privileged apps | |
904 | * clobbering the runtime directory unnecessarily. */ | |
00efd498 | 905 | |
e0d70f76 | 906 | r = configure_runtime_directory(handle, ur, runtime_path); |
00efd498 ZJS |
907 | if (r != PAM_SUCCESS) |
908 | return r; | |
98a28fef | 909 | } |
8c6db833 | 910 | |
b2f74f07 LP |
911 | /* Most likely we got the session/type/class from environment variables, but might have gotten the data |
912 | * somewhere else (for example PAM module parameters). Let's now update the environment variables, so that this | |
913 | * data is inherited into the session processes, and programs can rely on them to be initialized. */ | |
914 | ||
915 | r = update_environment(handle, "XDG_SESSION_TYPE", type); | |
916 | if (r != PAM_SUCCESS) | |
917 | return r; | |
918 | ||
919 | r = update_environment(handle, "XDG_SESSION_CLASS", class); | |
920 | if (r != PAM_SUCCESS) | |
921 | return r; | |
922 | ||
923 | r = update_environment(handle, "XDG_SESSION_DESKTOP", desktop); | |
924 | if (r != PAM_SUCCESS) | |
925 | return r; | |
926 | ||
d6baaa69 LP |
927 | r = update_environment(handle, "XDG_SEAT", seat); |
928 | if (r != PAM_SUCCESS) | |
929 | return r; | |
bbc73283 LP |
930 | |
931 | if (vtnr > 0) { | |
29d230f6 | 932 | char buf[DECIMAL_STR_MAX(vtnr)]; |
baae0358 | 933 | sprintf(buf, "%u", vtnr); |
bbc73283 | 934 | |
d6baaa69 LP |
935 | r = update_environment(handle, "XDG_VTNR", buf); |
936 | if (r != PAM_SUCCESS) | |
5a330cda | 937 | return r; |
bbc73283 LP |
938 | } |
939 | ||
77085881 LP |
940 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
941 | if (r != PAM_SUCCESS) { | |
d9608d40 | 942 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag: %s", pam_strerror(handle, r)); |
5a330cda | 943 | return r; |
77085881 LP |
944 | } |
945 | ||
21c390cc | 946 | if (session_fd >= 0) { |
85c08dc0 | 947 | session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); |
5a330cda ZJS |
948 | if (session_fd < 0) { |
949 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
950 | return PAM_SESSION_ERR; | |
951 | } | |
952 | ||
23e096cc | 953 | r = pam_set_data(handle, "systemd.session-fd", FD_TO_PTR(session_fd), NULL); |
21c390cc | 954 | if (r != PAM_SUCCESS) { |
d9608d40 | 955 | pam_syslog(handle, LOG_ERR, "Failed to install session fd: %s", pam_strerror(handle, r)); |
03e334a1 | 956 | safe_close(session_fd); |
5a330cda | 957 | return r; |
21c390cc | 958 | } |
98a28fef | 959 | } |
8c6db833 | 960 | |
e945dd9e | 961 | success: |
f9c1f4e1 LP |
962 | r = apply_user_record_settings(handle, ur, debug); |
963 | if (r != PAM_SUCCESS) | |
964 | return r; | |
965 | ||
355c9966 | 966 | /* Let's release the D-Bus connection, after all the session might live quite a long time, and we are |
f9c1f4e1 LP |
967 | * not going to use the bus connection in that time, so let's better close before the daemon kicks us |
968 | * off because we are not processing anything. */ | |
355c9966 | 969 | (void) pam_release_bus_connection(handle); |
ffcfcb6b | 970 | return PAM_SUCCESS; |
98a28fef | 971 | } |
8c6db833 | 972 | |
98a28fef LP |
973 | _public_ PAM_EXTERN int pam_sm_close_session( |
974 | pam_handle_t *handle, | |
975 | int flags, | |
976 | int argc, const char **argv) { | |
8c6db833 | 977 | |
5f41d1f1 | 978 | const void *existing = NULL; |
45c5fa25 | 979 | bool debug = false; |
75c8e3cf | 980 | const char *id; |
75c8e3cf | 981 | int r; |
8c6db833 | 982 | |
ffcfcb6b | 983 | assert(handle); |
75c8e3cf | 984 | |
45c5fa25 LP |
985 | if (parse_argv(handle, |
986 | argc, argv, | |
987 | NULL, | |
988 | NULL, | |
989 | NULL, | |
990 | &debug) < 0) | |
991 | return PAM_SESSION_ERR; | |
992 | ||
993 | if (debug) | |
994 | pam_syslog(handle, LOG_DEBUG, "pam-systemd shutting down"); | |
995 | ||
77085881 LP |
996 | /* Only release session if it wasn't pre-existing when we |
997 | * tried to create it */ | |
d487e2d6 | 998 | (void) pam_get_data(handle, "systemd.existing", &existing); |
77085881 | 999 | |
75c8e3cf | 1000 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 1001 | if (id && !existing) { |
355c9966 LP |
1002 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
1003 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
75c8e3cf | 1004 | |
355c9966 LP |
1005 | /* Before we go and close the FIFO we need to tell logind that this is a clean session |
1006 | * shutdown, so that it doesn't just go and slaughter us immediately after closing the fd */ | |
75c8e3cf | 1007 | |
355c9966 LP |
1008 | r = pam_acquire_bus_connection(handle, &bus); |
1009 | if (r != PAM_SUCCESS) | |
1010 | return r; | |
75c8e3cf | 1011 | |
5d990cc5 | 1012 | r = bus_call_method(bus, bus_login_mgr, "ReleaseSession", &error, NULL, "s", id); |
ffcfcb6b | 1013 | if (r < 0) { |
5f41d1f1 LP |
1014 | pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); |
1015 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
1016 | } |
1017 | } | |
1018 | ||
355c9966 LP |
1019 | /* Note that we are knowingly leaking the FIFO fd here. This way, logind can watch us die. If we |
1020 | * closed it here it would not have any clue when that is completed. Given that one cannot really | |
1021 | * have multiple PAM sessions open from the same process this means we will leak one FD at max. */ | |
75c8e3cf | 1022 | |
5f41d1f1 | 1023 | return PAM_SUCCESS; |
8c6db833 | 1024 | } |