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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
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" |
ed5033fd | 37 | #include "percent-util.h" |
df0ff127 | 38 | #include "process-util.h" |
f9c1f4e1 | 39 | #include "rlimit-util.h" |
00229fe4 | 40 | #include "socket-util.h" |
055c08ef | 41 | #include "stdio-util.h" |
00229fe4 LP |
42 | #include "strv.h" |
43 | #include "terminal-util.h" | |
9ab0d3eb LP |
44 | #include "user-util.h" |
45 | #include "userdb.h" | |
8c6db833 | 46 | |
fbcb6300 LP |
47 | #define LOGIN_SLOW_BUS_CALL_TIMEOUT_USEC (2*USEC_PER_MINUTE) |
48 | ||
baae0358 LP |
49 | static int parse_argv( |
50 | pam_handle_t *handle, | |
51 | int argc, const char **argv, | |
52 | const char **class, | |
49ebd11f | 53 | const char **type, |
f5cb2820 | 54 | const char **desktop, |
baae0358 | 55 | bool *debug) { |
8c6db833 LP |
56 | |
57 | unsigned i; | |
58 | ||
59 | assert(argc >= 0); | |
60 | assert(argc == 0 || argv); | |
61 | ||
49ebd11f | 62 | for (i = 0; i < (unsigned) argc; i++) { |
d9608d40 LP |
63 | const char *p; |
64 | ||
65 | if ((p = startswith(argv[i], "class="))) { | |
485507b8 | 66 | if (class) |
d9608d40 | 67 | *class = p; |
485507b8 | 68 | |
d9608d40 | 69 | } else if ((p = startswith(argv[i], "type="))) { |
49ebd11f | 70 | if (type) |
d9608d40 | 71 | *type = p; |
49ebd11f | 72 | |
d9608d40 | 73 | } else if ((p = startswith(argv[i], "desktop="))) { |
f5cb2820 | 74 | if (desktop) |
d9608d40 | 75 | *desktop = p; |
f5cb2820 | 76 | |
05a049cc ZJS |
77 | } else if (streq(argv[i], "debug")) { |
78 | if (debug) | |
79 | *debug = true; | |
fb6becb4 | 80 | |
d9608d40 | 81 | } else if ((p = startswith(argv[i], "debug="))) { |
05a049cc | 82 | int k; |
0e318cad | 83 | |
d9608d40 | 84 | k = parse_boolean(p); |
05a049cc | 85 | if (k < 0) |
d9608d40 | 86 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring: %s", p); |
05a049cc | 87 | else if (debug) |
0e318cad MS |
88 | *debug = k; |
89 | ||
05a049cc | 90 | } else |
fb6becb4 | 91 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); |
49ebd11f | 92 | } |
8c6db833 | 93 | |
8c6db833 LP |
94 | return 0; |
95 | } | |
96 | ||
9ab0d3eb | 97 | static int acquire_user_record( |
8c6db833 | 98 | pam_handle_t *handle, |
9ab0d3eb | 99 | UserRecord **ret_record) { |
8c6db833 | 100 | |
9ab0d3eb LP |
101 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL; |
102 | const char *username = NULL, *json = NULL; | |
dbe7fff4 | 103 | _cleanup_free_ char *field = NULL; |
8c6db833 LP |
104 | int r; |
105 | ||
106 | assert(handle); | |
8c6db833 | 107 | |
baae0358 LP |
108 | r = pam_get_user(handle, &username, NULL); |
109 | if (r != PAM_SUCCESS) { | |
d9608d40 | 110 | pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r)); |
baae0358 LP |
111 | return r; |
112 | } | |
d90b9d27 | 113 | |
baae0358 LP |
114 | if (isempty(username)) { |
115 | pam_syslog(handle, LOG_ERR, "User name not valid."); | |
9ab0d3eb | 116 | return PAM_SERVICE_ERR; |
8c6db833 LP |
117 | } |
118 | ||
dbe7fff4 | 119 | /* If pam_systemd_homed (or some other module) already acquired the user record we can reuse it |
9ab0d3eb | 120 | * here. */ |
dbe7fff4 LP |
121 | field = strjoin("systemd-user-record-", username); |
122 | if (!field) | |
123 | return pam_log_oom(handle); | |
9ab0d3eb | 124 | |
dbe7fff4 LP |
125 | r = pam_get_data(handle, field, (const void**) &json); |
126 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
127 | pam_syslog(handle, LOG_ERR, "Failed to get PAM user record data: %s", pam_strerror(handle, r)); | |
128 | return r; | |
129 | } | |
130 | if (r == PAM_SUCCESS && json) { | |
9ab0d3eb LP |
131 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; |
132 | ||
133 | /* Parse cached record */ | |
134 | r = json_parse(json, JSON_PARSE_SENSITIVE, &v, NULL, NULL); | |
135 | if (r < 0) { | |
136 | pam_syslog(handle, LOG_ERR, "Failed to parse JSON user record: %s", strerror_safe(r)); | |
137 | return PAM_SERVICE_ERR; | |
138 | } | |
139 | ||
140 | ur = user_record_new(); | |
141 | if (!ur) | |
142 | return pam_log_oom(handle); | |
143 | ||
bfc0cc1a | 144 | r = user_record_load(ur, v, USER_RECORD_LOAD_REFUSE_SECRET|USER_RECORD_PERMISSIVE); |
9ab0d3eb LP |
145 | if (r < 0) { |
146 | pam_syslog(handle, LOG_ERR, "Failed to load user record: %s", strerror_safe(r)); | |
147 | return PAM_SERVICE_ERR; | |
148 | } | |
149 | ||
150 | /* Safety check if cached record actually matches what we are looking for */ | |
151 | if (!streq_ptr(username, ur->user_name)) { | |
152 | pam_syslog(handle, LOG_ERR, "Acquired user record does not match user name."); | |
153 | return PAM_SERVICE_ERR; | |
154 | } | |
dbe7fff4 LP |
155 | } else { |
156 | _cleanup_free_ char *formatted = NULL; | |
157 | ||
158 | /* Request the record ourselves */ | |
159 | r = userdb_by_name(username, 0, &ur); | |
160 | if (r < 0) { | |
161 | pam_syslog(handle, LOG_ERR, "Failed to get user record: %s", strerror_safe(r)); | |
162 | return PAM_USER_UNKNOWN; | |
163 | } | |
164 | ||
165 | r = json_variant_format(ur->json, 0, &formatted); | |
166 | if (r < 0) { | |
167 | pam_syslog(handle, LOG_ERR, "Failed to format user JSON: %s", strerror_safe(r)); | |
168 | return PAM_SERVICE_ERR; | |
169 | } | |
170 | ||
171 | /* And cache it for everyone else */ | |
172 | r = pam_set_data(handle, field, formatted, pam_cleanup_free); | |
173 | if (r < 0) { | |
174 | pam_syslog(handle, LOG_ERR, "Failed to set PAM user record data '%s': %s", | |
175 | field, pam_strerror(handle, r)); | |
176 | return r; | |
177 | } | |
178 | ||
179 | TAKE_PTR(formatted); | |
9ab0d3eb LP |
180 | } |
181 | ||
182 | if (!uid_is_valid(ur->uid)) { | |
183 | pam_syslog(handle, LOG_ERR, "Acquired user record does not have a UID."); | |
184 | return PAM_SERVICE_ERR; | |
8c6db833 LP |
185 | } |
186 | ||
9ab0d3eb LP |
187 | if (ret_record) |
188 | *ret_record = TAKE_PTR(ur); | |
8c6db833 LP |
189 | |
190 | return PAM_SUCCESS; | |
191 | } | |
192 | ||
ecd5f1a9 LP |
193 | static bool display_is_local(const char *display) { |
194 | assert(display); | |
195 | ||
196 | return | |
197 | display[0] == ':' && | |
198 | display[1] >= '0' && | |
199 | display[1] <= '9'; | |
200 | } | |
201 | ||
ddf127cd TM |
202 | static int socket_from_display(const char *display) { |
203 | _cleanup_free_ char *f = NULL; | |
f7b8b5c4 | 204 | size_t k; |
ddf127cd TM |
205 | char *c; |
206 | union sockaddr_union sa; | |
207 | socklen_t sa_len; | |
208 | _cleanup_close_ int fd = -1; | |
209 | int r; | |
f7b8b5c4 LP |
210 | |
211 | assert(display); | |
f7b8b5c4 LP |
212 | |
213 | if (!display_is_local(display)) | |
214 | return -EINVAL; | |
215 | ||
216 | k = strspn(display+1, "0123456789"); | |
217 | ||
ddf127cd TM |
218 | /* Try abstract socket first. */ |
219 | f = new(char, STRLEN("@/tmp/.X11-unix/X") + k + 1); | |
f7b8b5c4 LP |
220 | if (!f) |
221 | return -ENOMEM; | |
222 | ||
ddf127cd | 223 | c = stpcpy(f, "@/tmp/.X11-unix/X"); |
f7b8b5c4 LP |
224 | memcpy(c, display+1, k); |
225 | c[k] = 0; | |
226 | ||
ddf127cd TM |
227 | r = sockaddr_un_set_path(&sa.un, f); |
228 | if (r < 0) | |
229 | return r; | |
230 | sa_len = r; | |
f7b8b5c4 | 231 | |
ddf127cd TM |
232 | fd = RET_NERRNO(socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0)); |
233 | if (fd < 0) | |
234 | return fd; | |
235 | ||
236 | r = RET_NERRNO(connect(fd, &sa.sa, sa_len)); | |
237 | if (r >= 0) | |
238 | return TAKE_FD(fd); | |
239 | if (r != -ECONNREFUSED) | |
240 | return r; | |
241 | ||
242 | /* Try also non-abstract socket. */ | |
243 | r = sockaddr_un_set_path(&sa.un, f + 1); | |
244 | if (r < 0) | |
245 | return r; | |
246 | sa_len = r; | |
247 | ||
248 | r = RET_NERRNO(connect(fd, &sa.sa, sa_len)); | |
249 | if (r >= 0) | |
250 | return TAKE_FD(fd); | |
251 | return r; | |
f7b8b5c4 LP |
252 | } |
253 | ||
4d6d6518 | 254 | static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { |
ddf127cd | 255 | _cleanup_free_ char *sys_path = NULL, *tty = NULL; |
baae0358 | 256 | _cleanup_close_ int fd = -1; |
4d6d6518 | 257 | struct ucred ucred; |
f36a9d59 | 258 | int v, r; |
e21d9060 | 259 | dev_t display_ctty; |
4d6d6518 LP |
260 | |
261 | assert(display); | |
4d6d6518 LP |
262 | assert(vtnr); |
263 | ||
264 | /* We deduce the X11 socket from the display name, then use | |
265 | * SO_PEERCRED to determine the X11 server process, ask for | |
266 | * the controlling tty of that and if it's a VC then we know | |
267 | * the seat and the virtual terminal. Sounds ugly, is only | |
268 | * semi-ugly. */ | |
269 | ||
ddf127cd | 270 | fd = socket_from_display(display); |
b92bea5d | 271 | if (fd < 0) |
ddf127cd | 272 | return fd; |
4d6d6518 | 273 | |
eff05270 | 274 | r = getpeercred(fd, &ucred); |
4d6d6518 | 275 | if (r < 0) |
eff05270 | 276 | return r; |
4d6d6518 | 277 | |
e21d9060 TM |
278 | r = get_ctty_devnr(ucred.pid, &display_ctty); |
279 | if (r < 0) | |
280 | return r; | |
281 | ||
282 | if (asprintf(&sys_path, "/sys/dev/char/%d:%d", major(display_ctty), minor(display_ctty)) < 0) | |
283 | return -ENOMEM; | |
284 | r = readlink_value(sys_path, &tty); | |
4d6d6518 LP |
285 | if (r < 0) |
286 | return r; | |
287 | ||
288 | v = vtnr_from_tty(tty); | |
4d6d6518 LP |
289 | if (v < 0) |
290 | return v; | |
291 | else if (v == 0) | |
292 | return -ENOENT; | |
293 | ||
fc7985ed LP |
294 | if (seat) |
295 | *seat = "seat0"; | |
4d6d6518 LP |
296 | *vtnr = (uint32_t) v; |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
00efd498 ZJS |
301 | static int export_legacy_dbus_address( |
302 | pam_handle_t *handle, | |
00efd498 ZJS |
303 | const char *runtime) { |
304 | ||
15ee6c20 ZJS |
305 | const char *s; |
306 | _cleanup_free_ char *t = NULL; | |
00efd498 ZJS |
307 | int r = PAM_BUF_ERR; |
308 | ||
15ee6c20 ZJS |
309 | /* We need to export $DBUS_SESSION_BUS_ADDRESS because various applications will not connect |
310 | * correctly to the bus without it. This setting matches what dbus.socket does for the user | |
311 | * session using 'systemctl --user set-environment'. We want to have the same configuration | |
312 | * in processes started from the PAM session. | |
313 | * | |
314 | * The setting of the address is guarded by the access() check because it is also possible to compile | |
315 | * dbus without --enable-user-session, in which case this socket is not used, and | |
316 | * $DBUS_SESSION_BUS_ADDRESS should not be set. An alternative approach would to not do the access() | |
317 | * check here, and let applications try on their own, by using "unix:path=%s/bus;autolaunch:". But we | |
318 | * expect the socket to be present by the time we do this check, so we can just as well check once | |
319 | * here. */ | |
320 | ||
321 | s = strjoina(runtime, "/bus"); | |
322 | if (access(s, F_OK) < 0) | |
323 | return PAM_SUCCESS; | |
324 | ||
325 | if (asprintf(&t, DEFAULT_USER_BUS_ADDRESS_FMT, runtime) < 0) | |
d750dde2 | 326 | return pam_log_oom(handle); |
00efd498 | 327 | |
15ee6c20 | 328 | r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", t, 0); |
d750dde2 LP |
329 | if (r != PAM_SUCCESS) { |
330 | pam_syslog(handle, LOG_ERR, "Failed to set bus variable: %s", pam_strerror(handle, r)); | |
331 | return r; | |
332 | } | |
00efd498 ZJS |
333 | |
334 | return PAM_SUCCESS; | |
00efd498 ZJS |
335 | } |
336 | ||
22f93314 JS |
337 | static int append_session_memory_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
338 | uint64_t val; | |
339 | int r; | |
340 | ||
341 | if (isempty(limit)) | |
7bfbf6cc | 342 | return PAM_SUCCESS; |
22f93314 JS |
343 | |
344 | if (streq(limit, "infinity")) { | |
f5fbe71d | 345 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", UINT64_MAX); |
d750dde2 LP |
346 | if (r < 0) |
347 | return pam_bus_log_create_error(handle, r); | |
348 | ||
7bfbf6cc | 349 | return PAM_SUCCESS; |
d750dde2 LP |
350 | } |
351 | ||
fe845b5e | 352 | r = parse_permyriad(limit); |
d750dde2 | 353 | if (r >= 0) { |
9cba32bc | 354 | r = sd_bus_message_append(m, "(sv)", "MemoryMaxScale", "u", UINT32_SCALE_FROM_PERMYRIAD(r)); |
d750dde2 LP |
355 | if (r < 0) |
356 | return pam_bus_log_create_error(handle, r); | |
357 | ||
7bfbf6cc | 358 | return PAM_SUCCESS; |
d750dde2 LP |
359 | } |
360 | ||
361 | r = parse_size(limit, 1024, &val); | |
362 | if (r >= 0) { | |
363 | r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", val); | |
364 | if (r < 0) | |
365 | return pam_bus_log_create_error(handle, r); | |
366 | ||
7bfbf6cc | 367 | return PAM_SUCCESS; |
22f93314 JS |
368 | } |
369 | ||
d750dde2 | 370 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.memory_max, ignoring: %s", limit); |
7bfbf6cc | 371 | return PAM_SUCCESS; |
22f93314 JS |
372 | } |
373 | ||
adc09af2 PW |
374 | static int append_session_runtime_max_sec(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
375 | usec_t val; | |
376 | int r; | |
377 | ||
378 | /* No need to parse "infinity" here, it will be set by default later in scope_init() */ | |
379 | if (isempty(limit) || streq(limit, "infinity")) | |
7bfbf6cc | 380 | return PAM_SUCCESS; |
adc09af2 PW |
381 | |
382 | r = parse_sec(limit, &val); | |
383 | if (r >= 0) { | |
384 | r = sd_bus_message_append(m, "(sv)", "RuntimeMaxUSec", "t", (uint64_t) val); | |
7bfbf6cc LP |
385 | if (r < 0) |
386 | return pam_bus_log_create_error(handle, r); | |
adc09af2 PW |
387 | } else |
388 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.runtime_max_sec: %s, ignoring.", limit); | |
389 | ||
7bfbf6cc | 390 | return PAM_SUCCESS; |
adc09af2 PW |
391 | } |
392 | ||
5fdfbbd5 | 393 | static int append_session_tasks_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { |
22f93314 JS |
394 | uint64_t val; |
395 | int r; | |
396 | ||
397 | /* No need to parse "infinity" here, it will be set unconditionally later in manager_start_scope() */ | |
398 | if (isempty(limit) || streq(limit, "infinity")) | |
7bfbf6cc | 399 | return PAM_SUCCESS; |
22f93314 JS |
400 | |
401 | r = safe_atou64(limit, &val); | |
402 | if (r >= 0) { | |
403 | r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", val); | |
d750dde2 LP |
404 | if (r < 0) |
405 | return pam_bus_log_create_error(handle, r); | |
22f93314 | 406 | } else |
d750dde2 | 407 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.tasks_max, ignoring: %s", limit); |
22f93314 | 408 | |
7bfbf6cc | 409 | return PAM_SUCCESS; |
22f93314 JS |
410 | } |
411 | ||
412 | static int append_session_cg_weight(pam_handle_t *handle, sd_bus_message *m, const char *limit, const char *field) { | |
413 | uint64_t val; | |
414 | int r; | |
415 | ||
36a4dbae | 416 | if (isempty(limit)) |
7bfbf6cc | 417 | return PAM_SUCCESS; |
36a4dbae LP |
418 | |
419 | r = cg_weight_parse(limit, &val); | |
420 | if (r >= 0) { | |
421 | r = sd_bus_message_append(m, "(sv)", field, "t", val); | |
d750dde2 LP |
422 | if (r < 0) |
423 | return pam_bus_log_create_error(handle, r); | |
36a4dbae | 424 | } else if (streq(field, "CPUWeight")) |
d750dde2 | 425 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.cpu_weight, ignoring: %s", limit); |
36a4dbae | 426 | else |
d750dde2 | 427 | pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.io_weight, ignoring: %s", limit); |
22f93314 | 428 | |
7bfbf6cc | 429 | return PAM_SUCCESS; |
22f93314 JS |
430 | } |
431 | ||
0ecc1c9d LP |
432 | static const char* getenv_harder(pam_handle_t *handle, const char *key, const char *fallback) { |
433 | const char *v; | |
434 | ||
435 | assert(handle); | |
436 | assert(key); | |
437 | ||
5238e957 | 438 | /* Looks for an environment variable, preferably in the environment block associated with the |
83d4ab55 LP |
439 | * specified PAM handle, falling back to the process' block instead. Why check both? Because we want |
440 | * to permit configuration of session properties from unit files that invoke PAM services, so that | |
441 | * PAM services don't have to be reworked to set systemd-specific properties, but these properties | |
442 | * can still be set from the unit file Environment= block. */ | |
0ecc1c9d LP |
443 | |
444 | v = pam_getenv(handle, key); | |
445 | if (!isempty(v)) | |
446 | return v; | |
447 | ||
83d4ab55 LP |
448 | /* We use secure_getenv() here, since we might get loaded into su/sudo, which are SUID. Ideally |
449 | * they'd clean up the environment before invoking foreign code (such as PAM modules), but alas they | |
450 | * currently don't (to be precise, they clean up the environment they pass to their children, but | |
451 | * not their own environ[]). */ | |
452 | v = secure_getenv(key); | |
0ecc1c9d LP |
453 | if (!isempty(v)) |
454 | return v; | |
455 | ||
456 | return fallback; | |
457 | } | |
458 | ||
d6baaa69 LP |
459 | static int update_environment(pam_handle_t *handle, const char *key, const char *value) { |
460 | int r; | |
461 | ||
462 | assert(handle); | |
463 | assert(key); | |
464 | ||
465 | /* Updates the environment, but only if there's actually a value set. Also, log about errors */ | |
466 | ||
467 | if (isempty(value)) | |
468 | return PAM_SUCCESS; | |
469 | ||
470 | r = pam_misc_setenv(handle, key, value, 0); | |
471 | if (r != PAM_SUCCESS) | |
d9608d40 | 472 | pam_syslog(handle, LOG_ERR, "Failed to set environment variable %s: %s", key, pam_strerror(handle, r)); |
d6baaa69 LP |
473 | |
474 | return r; | |
475 | } | |
476 | ||
b9217112 LP |
477 | static bool validate_runtime_directory(pam_handle_t *handle, const char *path, uid_t uid) { |
478 | struct stat st; | |
479 | ||
dca81e28 | 480 | assert(handle); |
b9217112 LP |
481 | assert(path); |
482 | ||
e0d70f76 LP |
483 | /* Some extra paranoia: let's not set $XDG_RUNTIME_DIR if the directory we'd set it to isn't actually |
484 | * set up properly for us. This is supposed to provide a careful safety net for supporting su/sudo | |
485 | * type transitions: in that case the UID changes, but the session and thus the user owning it | |
15e6a6e8 | 486 | * doesn't change. Since the $XDG_RUNTIME_DIR lifecycle is bound to the session's user being logged |
e0d70f76 LP |
487 | * in at least once we should be particularly careful when setting the environment variable, since |
488 | * otherwise we might end up setting $XDG_RUNTIME_DIR to some directory owned by the wrong user. */ | |
b9217112 | 489 | |
6d06dfad LP |
490 | if (!path_is_absolute(path)) { |
491 | pam_syslog(handle, LOG_ERR, "Provided runtime directory '%s' is not absolute.", path); | |
492 | goto fail; | |
493 | } | |
494 | ||
b9217112 | 495 | if (lstat(path, &st) < 0) { |
4bbccb02 | 496 | pam_syslog(handle, LOG_ERR, "Failed to stat() runtime directory '%s': %s", path, strerror_safe(errno)); |
b9217112 LP |
497 | goto fail; |
498 | } | |
499 | ||
500 | if (!S_ISDIR(st.st_mode)) { | |
501 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not actually a directory.", path); | |
502 | goto fail; | |
503 | } | |
504 | ||
505 | if (st.st_uid != uid) { | |
506 | pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not owned by UID " UID_FMT ", as it should.", path, uid); | |
507 | goto fail; | |
508 | } | |
509 | ||
510 | return true; | |
511 | ||
512 | fail: | |
513 | pam_syslog(handle, LOG_WARNING, "Not setting $XDG_RUNTIME_DIR, as the directory is not in order."); | |
514 | return false; | |
515 | } | |
516 | ||
f9c1f4e1 LP |
517 | static int pam_putenv_and_log(pam_handle_t *handle, const char *e, bool debug) { |
518 | int r; | |
519 | ||
520 | assert(handle); | |
521 | assert(e); | |
522 | ||
523 | r = pam_putenv(handle, e); | |
524 | if (r != PAM_SUCCESS) { | |
525 | pam_syslog(handle, LOG_ERR, "Failed to set PAM environment variable %s: %s", e, pam_strerror(handle, r)); | |
526 | return r; | |
527 | } | |
528 | ||
529 | if (debug) | |
530 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable %s set based on user record.", e); | |
531 | ||
532 | return PAM_SUCCESS; | |
533 | } | |
534 | ||
535 | static int apply_user_record_settings(pam_handle_t *handle, UserRecord *ur, bool debug) { | |
f9c1f4e1 LP |
536 | int r; |
537 | ||
538 | assert(handle); | |
539 | assert(ur); | |
540 | ||
541 | if (ur->umask != MODE_INVALID) { | |
542 | umask(ur->umask); | |
543 | ||
544 | if (debug) | |
545 | pam_syslog(handle, LOG_DEBUG, "Set user umask to %04o based on user record.", ur->umask); | |
546 | } | |
547 | ||
548 | STRV_FOREACH(i, ur->environment) { | |
549 | _cleanup_free_ char *n = NULL; | |
550 | const char *e; | |
551 | ||
552 | assert_se(e = strchr(*i, '=')); /* environment was already validated while parsing JSON record, this thus must hold */ | |
553 | ||
554 | n = strndup(*i, e - *i); | |
555 | if (!n) | |
556 | return pam_log_oom(handle); | |
557 | ||
558 | if (pam_getenv(handle, n)) { | |
559 | if (debug) | |
560 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable $%s already set, not changing based on record.", *i); | |
561 | continue; | |
562 | } | |
563 | ||
564 | r = pam_putenv_and_log(handle, *i, debug); | |
565 | if (r != PAM_SUCCESS) | |
566 | return r; | |
567 | } | |
568 | ||
569 | if (ur->email_address) { | |
570 | if (pam_getenv(handle, "EMAIL")) { | |
571 | if (debug) | |
572 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable $EMAIL already set, not changing based on user record."); | |
573 | } else { | |
574 | _cleanup_free_ char *joined = NULL; | |
575 | ||
576 | joined = strjoin("EMAIL=", ur->email_address); | |
577 | if (!joined) | |
578 | return pam_log_oom(handle); | |
579 | ||
580 | r = pam_putenv_and_log(handle, joined, debug); | |
581 | if (r != PAM_SUCCESS) | |
582 | return r; | |
583 | } | |
584 | } | |
585 | ||
586 | if (ur->time_zone) { | |
587 | if (pam_getenv(handle, "TZ")) { | |
588 | if (debug) | |
589 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable $TZ already set, not changing based on user record."); | |
590 | } else if (!timezone_is_valid(ur->time_zone, LOG_DEBUG)) { | |
591 | if (debug) | |
592 | pam_syslog(handle, LOG_DEBUG, "Time zone specified in user record is not valid locally, not setting $TZ."); | |
593 | } else { | |
594 | _cleanup_free_ char *joined = NULL; | |
595 | ||
596 | joined = strjoin("TZ=:", ur->time_zone); | |
597 | if (!joined) | |
598 | return pam_log_oom(handle); | |
599 | ||
600 | r = pam_putenv_and_log(handle, joined, debug); | |
601 | if (r != PAM_SUCCESS) | |
602 | return r; | |
603 | } | |
604 | } | |
605 | ||
606 | if (ur->preferred_language) { | |
607 | if (pam_getenv(handle, "LANG")) { | |
608 | if (debug) | |
609 | pam_syslog(handle, LOG_DEBUG, "PAM environment variable $LANG already set, not changing based on user record."); | |
a00a78b8 | 610 | } else if (locale_is_installed(ur->preferred_language) <= 0) { |
f9c1f4e1 | 611 | if (debug) |
a00a78b8 | 612 | pam_syslog(handle, LOG_DEBUG, "Preferred language specified in user record is not valid or not installed, not setting $LANG."); |
f9c1f4e1 LP |
613 | } else { |
614 | _cleanup_free_ char *joined = NULL; | |
615 | ||
616 | joined = strjoin("LANG=", ur->preferred_language); | |
617 | if (!joined) | |
618 | return pam_log_oom(handle); | |
619 | ||
620 | r = pam_putenv_and_log(handle, joined, debug); | |
621 | if (r != PAM_SUCCESS) | |
622 | return r; | |
623 | } | |
624 | } | |
625 | ||
626 | if (nice_is_valid(ur->nice_level)) { | |
627 | if (nice(ur->nice_level) < 0) | |
628 | pam_syslog(handle, LOG_ERR, "Failed to set nice level to %i, ignoring: %s", ur->nice_level, strerror_safe(errno)); | |
629 | else if (debug) | |
630 | pam_syslog(handle, LOG_DEBUG, "Nice level set, based on user record."); | |
631 | } | |
632 | ||
633 | for (int rl = 0; rl < _RLIMIT_MAX; rl++) { | |
634 | ||
635 | if (!ur->rlimits[rl]) | |
636 | continue; | |
637 | ||
638 | r = setrlimit_closest(rl, ur->rlimits[rl]); | |
639 | if (r < 0) | |
640 | pam_syslog(handle, LOG_ERR, "Failed to set resource limit %s, ignoring: %s", rlimit_to_string(rl), strerror_safe(r)); | |
641 | else if (debug) | |
642 | pam_syslog(handle, LOG_DEBUG, "Resource limit %s set, based on user record.", rlimit_to_string(rl)); | |
643 | } | |
644 | ||
645 | return PAM_SUCCESS; | |
646 | } | |
647 | ||
e0d70f76 LP |
648 | static int configure_runtime_directory( |
649 | pam_handle_t *handle, | |
650 | UserRecord *ur, | |
651 | const char *rt) { | |
652 | ||
653 | int r; | |
654 | ||
655 | assert(handle); | |
656 | assert(ur); | |
657 | assert(rt); | |
658 | ||
659 | if (!validate_runtime_directory(handle, rt, ur->uid)) | |
660 | return PAM_SUCCESS; | |
661 | ||
662 | r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); | |
663 | if (r != PAM_SUCCESS) { | |
664 | pam_syslog(handle, LOG_ERR, "Failed to set runtime dir: %s", pam_strerror(handle, r)); | |
665 | return r; | |
666 | } | |
667 | ||
668 | return export_legacy_dbus_address(handle, rt); | |
669 | } | |
670 | ||
98a28fef | 671 | _public_ PAM_EXTERN int pam_sm_open_session( |
8c6db833 LP |
672 | pam_handle_t *handle, |
673 | int flags, | |
674 | int argc, const char **argv) { | |
675 | ||
4afd3348 | 676 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
22f93314 | 677 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; |
d1529c9e | 678 | const char |
9ab0d3eb | 679 | *id, *object_path, *runtime_path, |
d1529c9e LP |
680 | *service = NULL, |
681 | *tty = NULL, *display = NULL, | |
682 | *remote_user = NULL, *remote_host = NULL, | |
683 | *seat = NULL, | |
684 | *type = NULL, *class = NULL, | |
f5cb2820 | 685 | *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL, *desktop_pam = NULL, |
adc09af2 | 686 | *memory_max = NULL, *tasks_max = NULL, *cpu_weight = NULL, *io_weight = NULL, *runtime_max_sec = NULL; |
4afd3348 | 687 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; |
9ab0d3eb | 688 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL; |
d1529c9e | 689 | int session_fd = -1, existing, r; |
d1529c9e | 690 | bool debug = false, remote; |
baae0358 LP |
691 | uint32_t vtnr = 0; |
692 | uid_t original_uid; | |
8c6db833 | 693 | |
ffcfcb6b | 694 | assert(handle); |
98a28fef | 695 | |
e9fbc77c LP |
696 | if (parse_argv(handle, |
697 | argc, argv, | |
fb6becb4 | 698 | &class_pam, |
49ebd11f | 699 | &type_pam, |
f5cb2820 | 700 | &desktop_pam, |
5a330cda ZJS |
701 | &debug) < 0) |
702 | return PAM_SESSION_ERR; | |
74fe1fe3 | 703 | |
baae0358 | 704 | if (debug) |
3831838a | 705 | pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); |
baae0358 | 706 | |
9ab0d3eb | 707 | r = acquire_user_record(handle, &ur); |
42e66809 | 708 | if (r != PAM_SUCCESS) |
5a330cda | 709 | return r; |
8c6db833 | 710 | |
e945dd9e LP |
711 | /* Make most of this a NOP on non-logind systems */ |
712 | if (!logind_running()) | |
713 | goto success; | |
714 | ||
30b2c336 LP |
715 | /* Make sure we don't enter a loop by talking to |
716 | * systemd-logind when it is actually waiting for the | |
717 | * background to finish start-up. If the service is | |
5c390a4a | 718 | * "systemd-user" we simply set XDG_RUNTIME_DIR and |
30b2c336 LP |
719 | * leave. */ |
720 | ||
148369de RS |
721 | r = pam_get_item(handle, PAM_SERVICE, (const void**) &service); |
722 | if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS)) { | |
723 | pam_syslog(handle, LOG_ERR, "Failed to get PAM service: %s", pam_strerror(handle, r)); | |
724 | return r; | |
725 | } | |
5c390a4a | 726 | if (streq_ptr(service, "systemd-user")) { |
055c08ef | 727 | char rt[STRLEN("/run/user/") + DECIMAL_STR_MAX(uid_t)]; |
30b2c336 | 728 | |
9ab0d3eb | 729 | xsprintf(rt, "/run/user/"UID_FMT, ur->uid); |
e0d70f76 | 730 | r = configure_runtime_directory(handle, ur, rt); |
00efd498 ZJS |
731 | if (r != PAM_SUCCESS) |
732 | return r; | |
733 | ||
e945dd9e | 734 | goto success; |
8c6db833 LP |
735 | } |
736 | ||
ffcfcb6b | 737 | /* Otherwise, we ask logind to create a session for us */ |
8c6db833 | 738 | |
148369de RS |
739 | r = pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); |
740 | if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS)) { | |
741 | pam_syslog(handle, LOG_ERR, "Failed to get PAM XDISPLAY: %s", pam_strerror(handle, r)); | |
742 | return r; | |
743 | } | |
744 | r = pam_get_item(handle, PAM_TTY, (const void**) &tty); | |
745 | if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS)) { | |
746 | pam_syslog(handle, LOG_ERR, "Failed to get PAM TTY: %s", pam_strerror(handle, r)); | |
747 | return r; | |
748 | } | |
749 | r = pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); | |
750 | if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS)) { | |
751 | pam_syslog(handle, LOG_ERR, "Failed to get PAM RUSER: %s", pam_strerror(handle, r)); | |
752 | return r; | |
753 | } | |
754 | r = pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); | |
755 | if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS)) { | |
756 | pam_syslog(handle, LOG_ERR, "Failed to get PAM RHOST: %s", pam_strerror(handle, r)); | |
757 | return r; | |
758 | } | |
a8573ccc | 759 | |
0ecc1c9d LP |
760 | seat = getenv_harder(handle, "XDG_SEAT", NULL); |
761 | cvtnr = getenv_harder(handle, "XDG_VTNR", NULL); | |
762 | type = getenv_harder(handle, "XDG_SESSION_TYPE", type_pam); | |
763 | class = getenv_harder(handle, "XDG_SESSION_CLASS", class_pam); | |
f5cb2820 | 764 | desktop = getenv_harder(handle, "XDG_SESSION_DESKTOP", desktop_pam); |
a4cd87e9 | 765 | |
ed18b08b | 766 | tty = strempty(tty); |
98a28fef | 767 | |
ee8545b0 | 768 | if (strchr(tty, ':')) { |
3a736949 LP |
769 | /* A tty with a colon is usually an X11 display, placed there to show up in utmp. We rearrange things |
770 | * and don't pretend that an X display was a tty. */ | |
ee8545b0 LP |
771 | if (isempty(display)) |
772 | display = tty; | |
a4cd87e9 | 773 | tty = NULL; |
3a736949 | 774 | |
1a4459d6 | 775 | } else if (streq(tty, "cron")) { |
3a736949 LP |
776 | /* cron is setting PAM_TTY to "cron" for some reason (the commit carries no information why, but |
777 | * probably because it wants to set it to something as pam_time/pam_access/… require PAM_TTY to be set | |
778 | * (as they otherwise even try to update it!) — but cron doesn't actually allocate a TTY for its forked | |
779 | * off processes.) */ | |
0ad1271f | 780 | type = "unspecified"; |
49ebd11f | 781 | class = "background"; |
a4cd87e9 | 782 | tty = NULL; |
3a736949 | 783 | |
0ad1271f | 784 | } else if (streq(tty, "ssh")) { |
3a736949 LP |
785 | /* ssh has been setting PAM_TTY to "ssh" (for the same reason as cron does this, see above. For further |
786 | * details look for "PAM_TTY_KLUDGE" in the openssh sources). */ | |
0ad1271f | 787 | type ="tty"; |
49ebd11f | 788 | class = "user"; |
3a736949 LP |
789 | tty = NULL; /* This one is particularly sad, as this means that ssh sessions — even though usually |
790 | * associated with a pty — won't be tracked by their tty in logind. This is because ssh | |
791 | * does the PAM session registration early for new connections, and registers a pty only | |
792 | * much later (this is because it doesn't know yet if it needs one at all, as whether to | |
793 | * register a pty or not is negotiated much later in the protocol). */ | |
794 | ||
c9ed61e7 LP |
795 | } else |
796 | /* Chop off leading /dev prefix that some clients specify, but others do not. */ | |
797 | tty = skip_dev_prefix(tty); | |
ee8545b0 | 798 | |
8e7705e5 | 799 | /* If this fails vtnr will be 0, that's intended */ |
4d6d6518 | 800 | if (!isempty(cvtnr)) |
2ae4842b | 801 | (void) safe_atou32(cvtnr, &vtnr); |
4d6d6518 | 802 | |
92bd5ff3 | 803 | if (!isempty(display) && !vtnr) { |
fc7985ed | 804 | if (isempty(seat)) |
d487e2d6 | 805 | (void) get_seat_from_display(display, &seat, &vtnr); |
fc7985ed | 806 | else if (streq(seat, "seat0")) |
d487e2d6 | 807 | (void) get_seat_from_display(display, NULL, &vtnr); |
fc7985ed | 808 | } |
4d6d6518 | 809 | |
49ebd11f | 810 | if (seat && !streq(seat, "seat0") && vtnr != 0) { |
2675747f LP |
811 | if (debug) |
812 | pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); | |
d7353ef6 MM |
813 | vtnr = 0; |
814 | } | |
815 | ||
49ebd11f | 816 | if (isempty(type)) |
0ad1271f | 817 | type = !isempty(display) ? "x11" : |
49ebd11f | 818 | !isempty(tty) ? "tty" : "unspecified"; |
98a28fef | 819 | |
55efac6c | 820 | if (isempty(class)) |
e2acb67b | 821 | class = streq(type, "unspecified") ? "background" : "user"; |
55efac6c | 822 | |
fecc80c1 | 823 | remote = !isempty(remote_host) && !is_localhost(remote_host); |
98a28fef | 824 | |
148369de RS |
825 | r = pam_get_data(handle, "systemd.memory_max", (const void **)&memory_max); |
826 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
827 | pam_syslog(handle, LOG_ERR, "Failed to get PAM systemd.memory_max data: %s", pam_strerror(handle, r)); | |
828 | return r; | |
829 | } | |
830 | r = pam_get_data(handle, "systemd.tasks_max", (const void **)&tasks_max); | |
831 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
832 | pam_syslog(handle, LOG_ERR, "Failed to get PAM systemd.tasks_max data: %s", pam_strerror(handle, r)); | |
833 | return r; | |
834 | } | |
835 | r = pam_get_data(handle, "systemd.cpu_weight", (const void **)&cpu_weight); | |
836 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
837 | pam_syslog(handle, LOG_ERR, "Failed to get PAM systemd.cpu_weight data: %s", pam_strerror(handle, r)); | |
838 | return r; | |
839 | } | |
840 | r = pam_get_data(handle, "systemd.io_weight", (const void **)&io_weight); | |
841 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
842 | pam_syslog(handle, LOG_ERR, "Failed to get PAM systemd.io_weight data: %s", pam_strerror(handle, r)); | |
843 | return r; | |
844 | } | |
845 | r = pam_get_data(handle, "systemd.runtime_max_sec", (const void **)&runtime_max_sec); | |
846 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
847 | pam_syslog(handle, LOG_ERR, "Failed to get PAM systemd.runtime_max_sec data: %s", pam_strerror(handle, r)); | |
848 | return r; | |
849 | } | |
22f93314 | 850 | |
4d49b48c | 851 | /* Talk to logind over the message bus */ |
5a330cda | 852 | |
355c9966 LP |
853 | r = pam_acquire_bus_connection(handle, &bus); |
854 | if (r != PAM_SUCCESS) | |
855 | return r; | |
cc377381 | 856 | |
22f93314 | 857 | if (debug) { |
ce959314 | 858 | pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " |
1fa2f38f | 859 | "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 | 860 | ur->uid, getpid_cached(), |
baae0358 | 861 | strempty(service), |
cda7ecb0 | 862 | type, class, strempty(desktop), |
a4cd87e9 | 863 | strempty(seat), vtnr, strempty(tty), strempty(display), |
baae0358 | 864 | yes_no(remote), strempty(remote_user), strempty(remote_host)); |
22f93314 | 865 | pam_syslog(handle, LOG_DEBUG, "Session limits: " |
adc09af2 PW |
866 | "memory_max=%s tasks_max=%s cpu_weight=%s io_weight=%s runtime_max_sec=%s", |
867 | strna(memory_max), strna(tasks_max), strna(cpu_weight), strna(io_weight), strna(runtime_max_sec)); | |
22f93314 JS |
868 | } |
869 | ||
5d990cc5 | 870 | r = bus_message_new_method_call(bus, &m, bus_login_mgr, "CreateSession"); |
d750dde2 LP |
871 | if (r < 0) |
872 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
873 | |
874 | r = sd_bus_message_append(m, "uusssssussbss", | |
9ab0d3eb | 875 | (uint32_t) ur->uid, |
da0da5ec | 876 | 0, |
22f93314 JS |
877 | service, |
878 | type, | |
879 | class, | |
880 | desktop, | |
881 | seat, | |
882 | vtnr, | |
883 | tty, | |
884 | display, | |
885 | remote, | |
886 | remote_user, | |
887 | remote_host); | |
d750dde2 LP |
888 | if (r < 0) |
889 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
890 | |
891 | r = sd_bus_message_open_container(m, 'a', "(sv)"); | |
d750dde2 LP |
892 | if (r < 0) |
893 | return pam_bus_log_create_error(handle, r); | |
22f93314 JS |
894 | |
895 | r = append_session_memory_max(handle, m, memory_max); | |
7bfbf6cc LP |
896 | if (r != PAM_SUCCESS) |
897 | return r; | |
22f93314 | 898 | |
adc09af2 | 899 | r = append_session_runtime_max_sec(handle, m, runtime_max_sec); |
7bfbf6cc LP |
900 | if (r != PAM_SUCCESS) |
901 | return r; | |
adc09af2 | 902 | |
22f93314 | 903 | r = append_session_tasks_max(handle, m, tasks_max); |
7bfbf6cc LP |
904 | if (r != PAM_SUCCESS) |
905 | return r; | |
22f93314 JS |
906 | |
907 | r = append_session_cg_weight(handle, m, cpu_weight, "CPUWeight"); | |
7bfbf6cc LP |
908 | if (r != PAM_SUCCESS) |
909 | return r; | |
22f93314 JS |
910 | |
911 | r = append_session_cg_weight(handle, m, io_weight, "IOWeight"); | |
7bfbf6cc LP |
912 | if (r != PAM_SUCCESS) |
913 | return r; | |
22f93314 JS |
914 | |
915 | r = sd_bus_message_close_container(m); | |
d750dde2 LP |
916 | if (r < 0) |
917 | return pam_bus_log_create_error(handle, r); | |
ce959314 | 918 | |
fbcb6300 | 919 | r = sd_bus_call(bus, m, LOGIN_SLOW_BUS_CALL_TIMEOUT_USEC, &error, &reply); |
ffcfcb6b | 920 | if (r < 0) { |
b80120c4 | 921 | if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { |
2675747f | 922 | if (debug) |
c7e93c4d | 923 | pam_syslog(handle, LOG_DEBUG, "Not creating session: %s", bus_error_message(&error, r)); |
e945dd9e LP |
924 | |
925 | /* We are already in a session, don't do anything */ | |
926 | goto success; | |
b80120c4 DH |
927 | } else { |
928 | pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); | |
8d46418e | 929 | return PAM_SESSION_ERR; |
b80120c4 | 930 | } |
98a28fef | 931 | } |
74fe1fe3 | 932 | |
ffcfcb6b | 933 | r = sd_bus_message_read(reply, |
baae0358 | 934 | "soshusub", |
ffcfcb6b ZJS |
935 | &id, |
936 | &object_path, | |
937 | &runtime_path, | |
938 | &session_fd, | |
baae0358 | 939 | &original_uid, |
ffcfcb6b ZJS |
940 | &seat, |
941 | &vtnr, | |
942 | &existing); | |
d750dde2 LP |
943 | if (r < 0) |
944 | return pam_bus_log_parse_error(handle, r); | |
74fe1fe3 | 945 | |
ce959314 MS |
946 | if (debug) |
947 | pam_syslog(handle, LOG_DEBUG, "Reply from logind: " | |
baae0358 LP |
948 | "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", |
949 | id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); | |
ce959314 | 950 | |
d6baaa69 LP |
951 | r = update_environment(handle, "XDG_SESSION_ID", id); |
952 | if (r != PAM_SUCCESS) | |
5a330cda | 953 | return r; |
8c6db833 | 954 | |
9ab0d3eb | 955 | if (original_uid == ur->uid) { |
e0d70f76 LP |
956 | /* Don't set $XDG_RUNTIME_DIR if the user we now authenticated for does not match the |
957 | * original user of the session. We do this in order not to result in privileged apps | |
958 | * clobbering the runtime directory unnecessarily. */ | |
00efd498 | 959 | |
e0d70f76 | 960 | r = configure_runtime_directory(handle, ur, runtime_path); |
00efd498 ZJS |
961 | if (r != PAM_SUCCESS) |
962 | return r; | |
98a28fef | 963 | } |
8c6db833 | 964 | |
b2f74f07 LP |
965 | /* Most likely we got the session/type/class from environment variables, but might have gotten the data |
966 | * somewhere else (for example PAM module parameters). Let's now update the environment variables, so that this | |
967 | * data is inherited into the session processes, and programs can rely on them to be initialized. */ | |
968 | ||
969 | r = update_environment(handle, "XDG_SESSION_TYPE", type); | |
970 | if (r != PAM_SUCCESS) | |
971 | return r; | |
972 | ||
973 | r = update_environment(handle, "XDG_SESSION_CLASS", class); | |
974 | if (r != PAM_SUCCESS) | |
975 | return r; | |
976 | ||
977 | r = update_environment(handle, "XDG_SESSION_DESKTOP", desktop); | |
978 | if (r != PAM_SUCCESS) | |
979 | return r; | |
980 | ||
d6baaa69 LP |
981 | r = update_environment(handle, "XDG_SEAT", seat); |
982 | if (r != PAM_SUCCESS) | |
983 | return r; | |
bbc73283 LP |
984 | |
985 | if (vtnr > 0) { | |
29d230f6 | 986 | char buf[DECIMAL_STR_MAX(vtnr)]; |
baae0358 | 987 | sprintf(buf, "%u", vtnr); |
bbc73283 | 988 | |
d6baaa69 LP |
989 | r = update_environment(handle, "XDG_VTNR", buf); |
990 | if (r != PAM_SUCCESS) | |
5a330cda | 991 | return r; |
bbc73283 LP |
992 | } |
993 | ||
77085881 LP |
994 | r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); |
995 | if (r != PAM_SUCCESS) { | |
d9608d40 | 996 | pam_syslog(handle, LOG_ERR, "Failed to install existing flag: %s", pam_strerror(handle, r)); |
5a330cda | 997 | return r; |
77085881 LP |
998 | } |
999 | ||
21c390cc | 1000 | if (session_fd >= 0) { |
85c08dc0 | 1001 | session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); |
5a330cda ZJS |
1002 | if (session_fd < 0) { |
1003 | pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); | |
1004 | return PAM_SESSION_ERR; | |
1005 | } | |
1006 | ||
23e096cc | 1007 | r = pam_set_data(handle, "systemd.session-fd", FD_TO_PTR(session_fd), NULL); |
21c390cc | 1008 | if (r != PAM_SUCCESS) { |
d9608d40 | 1009 | pam_syslog(handle, LOG_ERR, "Failed to install session fd: %s", pam_strerror(handle, r)); |
03e334a1 | 1010 | safe_close(session_fd); |
5a330cda | 1011 | return r; |
21c390cc | 1012 | } |
98a28fef | 1013 | } |
8c6db833 | 1014 | |
e945dd9e | 1015 | success: |
f9c1f4e1 LP |
1016 | r = apply_user_record_settings(handle, ur, debug); |
1017 | if (r != PAM_SUCCESS) | |
1018 | return r; | |
1019 | ||
355c9966 | 1020 | /* Let's release the D-Bus connection, after all the session might live quite a long time, and we are |
f9c1f4e1 LP |
1021 | * not going to use the bus connection in that time, so let's better close before the daemon kicks us |
1022 | * off because we are not processing anything. */ | |
355c9966 | 1023 | (void) pam_release_bus_connection(handle); |
ffcfcb6b | 1024 | return PAM_SUCCESS; |
98a28fef | 1025 | } |
8c6db833 | 1026 | |
98a28fef LP |
1027 | _public_ PAM_EXTERN int pam_sm_close_session( |
1028 | pam_handle_t *handle, | |
1029 | int flags, | |
1030 | int argc, const char **argv) { | |
8c6db833 | 1031 | |
5f41d1f1 | 1032 | const void *existing = NULL; |
45c5fa25 | 1033 | bool debug = false; |
75c8e3cf | 1034 | const char *id; |
75c8e3cf | 1035 | int r; |
8c6db833 | 1036 | |
ffcfcb6b | 1037 | assert(handle); |
75c8e3cf | 1038 | |
45c5fa25 LP |
1039 | if (parse_argv(handle, |
1040 | argc, argv, | |
1041 | NULL, | |
1042 | NULL, | |
1043 | NULL, | |
1044 | &debug) < 0) | |
1045 | return PAM_SESSION_ERR; | |
1046 | ||
1047 | if (debug) | |
1048 | pam_syslog(handle, LOG_DEBUG, "pam-systemd shutting down"); | |
1049 | ||
77085881 LP |
1050 | /* Only release session if it wasn't pre-existing when we |
1051 | * tried to create it */ | |
148369de RS |
1052 | r = pam_get_data(handle, "systemd.existing", &existing); |
1053 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { | |
1054 | pam_syslog(handle, LOG_ERR, "Failed to get PAM systemd.existing data: %s", pam_strerror(handle, r)); | |
1055 | return r; | |
1056 | } | |
77085881 | 1057 | |
75c8e3cf | 1058 | id = pam_getenv(handle, "XDG_SESSION_ID"); |
77085881 | 1059 | if (id && !existing) { |
355c9966 LP |
1060 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
1061 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
75c8e3cf | 1062 | |
355c9966 LP |
1063 | /* Before we go and close the FIFO we need to tell logind that this is a clean session |
1064 | * shutdown, so that it doesn't just go and slaughter us immediately after closing the fd */ | |
75c8e3cf | 1065 | |
355c9966 LP |
1066 | r = pam_acquire_bus_connection(handle, &bus); |
1067 | if (r != PAM_SUCCESS) | |
1068 | return r; | |
75c8e3cf | 1069 | |
5d990cc5 | 1070 | r = bus_call_method(bus, bus_login_mgr, "ReleaseSession", &error, NULL, "s", id); |
ffcfcb6b | 1071 | if (r < 0) { |
5f41d1f1 LP |
1072 | pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); |
1073 | return PAM_SESSION_ERR; | |
75c8e3cf LP |
1074 | } |
1075 | } | |
1076 | ||
355c9966 LP |
1077 | /* Note that we are knowingly leaking the FIFO fd here. This way, logind can watch us die. If we |
1078 | * closed it here it would not have any clue when that is completed. Given that one cannot really | |
1079 | * have multiple PAM sessions open from the same process this means we will leak one FD at max. */ | |
75c8e3cf | 1080 | |
5f41d1f1 | 1081 | return PAM_SUCCESS; |
8c6db833 | 1082 | } |