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26cf9fb7 LP |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | ||
3 | #include <security/pam_ext.h> | |
4 | #include <security/pam_modules.h> | |
5 | ||
6 | #include "sd-bus.h" | |
7 | ||
8 | #include "bus-common-errors.h" | |
ea7cbf5b | 9 | #include "bus-util.h" |
26cf9fb7 LP |
10 | #include "errno-util.h" |
11 | #include "fd-util.h" | |
12 | #include "home-util.h" | |
13 | #include "memory-util.h" | |
14 | #include "pam-util.h" | |
15 | #include "parse-util.h" | |
16 | #include "strv.h" | |
17 | #include "user-record-util.h" | |
18 | #include "user-record.h" | |
19 | #include "user-util.h" | |
20 | ||
26cf9fb7 LP |
21 | static int parse_argv( |
22 | pam_handle_t *handle, | |
23 | int argc, const char **argv, | |
24 | bool *please_suspend, | |
25 | bool *debug) { | |
26 | ||
27 | int i; | |
28 | ||
29 | assert(argc >= 0); | |
30 | assert(argc == 0 || argv); | |
31 | ||
32 | for (i = 0; i < argc; i++) { | |
33 | const char *v; | |
34 | ||
f12d19b3 | 35 | if ((v = startswith(argv[i], "suspend="))) { |
26cf9fb7 LP |
36 | int k; |
37 | ||
38 | k = parse_boolean(v); | |
39 | if (k < 0) | |
80ace4f2 | 40 | pam_syslog(handle, LOG_WARNING, "Failed to parse suspend= argument, ignoring: %s", v); |
26cf9fb7 LP |
41 | else if (please_suspend) |
42 | *please_suspend = k; | |
43 | ||
332f38d0 JS |
44 | } else if (streq(argv[i], "debug")) { |
45 | if (debug) | |
46 | *debug = true; | |
47 | ||
26cf9fb7 LP |
48 | } else if ((v = startswith(argv[i], "debug="))) { |
49 | int k; | |
26cf9fb7 LP |
50 | k = parse_boolean(v); |
51 | if (k < 0) | |
52 | pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring: %s", v); | |
53 | else if (debug) | |
54 | *debug = k; | |
55 | ||
56 | } else | |
57 | pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); | |
58 | } | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int acquire_user_record( | |
64 | pam_handle_t *handle, | |
65 | UserRecord **ret_record) { | |
66 | ||
67 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; | |
68 | _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; | |
69 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL; | |
70 | _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL; | |
71 | const char *username = NULL, *json = NULL; | |
dbe7fff4 | 72 | _cleanup_free_ char *homed_field = NULL; |
26cf9fb7 LP |
73 | int r; |
74 | ||
75 | assert(handle); | |
76 | ||
77 | r = pam_get_user(handle, &username, NULL); | |
78 | if (r != PAM_SUCCESS) { | |
79 | pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r)); | |
80 | return r; | |
81 | } | |
82 | ||
83 | if (isempty(username)) { | |
84 | pam_syslog(handle, LOG_ERR, "User name not set."); | |
85 | return PAM_SERVICE_ERR; | |
86 | } | |
87 | ||
88 | /* Let's bypass all IPC complexity for the two user names we know for sure we don't manage, and for | |
89 | * user names we don't consider valid. */ | |
7a8867ab | 90 | if (STR_IN_SET(username, "root", NOBODY_USER_NAME) || !valid_user_group_name(username, 0)) |
26cf9fb7 LP |
91 | return PAM_USER_UNKNOWN; |
92 | ||
dbe7fff4 LP |
93 | /* We cache the user record in the PAM context. We use a field name that includes the username, since |
94 | * clients might change the user name associated with a PAM context underneath us. Notably, 'sudo' | |
95 | * creates a single PAM context and first authenticates it with the user set to the originating user, | |
96 | * then updates the user for the destination user and issues the session stack with the same PAM | |
97 | * context. We thus must be prepared that the user record changes between calls and we keep any | |
98 | * caching separate. */ | |
99 | homed_field = strjoin("systemd-home-user-record-", username); | |
100 | if (!homed_field) | |
101 | return pam_log_oom(handle); | |
102 | ||
103 | /* Let's use the cache, so that we can share it between the session and the authentication hooks */ | |
104 | r = pam_get_data(handle, homed_field, (const void**) &json); | |
26cf9fb7 | 105 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) { |
dbe7fff4 | 106 | pam_syslog(handle, LOG_ERR, "Failed to get PAM user record data: %s", pam_strerror(handle, r)); |
26cf9fb7 | 107 | return r; |
26cf9fb7 | 108 | } |
dbe7fff4 LP |
109 | if (r == PAM_SUCCESS && json) { |
110 | /* We determined earlier that this is not a homed user? Then exit early. (We use -1 as | |
111 | * negative cache indicator) */ | |
112 | if (json == (void*) -1) | |
113 | return PAM_USER_UNKNOWN; | |
114 | } else { | |
26cf9fb7 | 115 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
dbe7fff4 | 116 | _cleanup_free_ char *generic_field = NULL, *json_copy = NULL; |
26cf9fb7 LP |
117 | |
118 | r = pam_acquire_bus_connection(handle, &bus); | |
119 | if (r != PAM_SUCCESS) | |
120 | return r; | |
121 | ||
8a1596aa | 122 | r = bus_call_method(bus, bus_home_mgr, "GetUserRecordByName", &error, &reply, "s", username); |
26cf9fb7 LP |
123 | if (r < 0) { |
124 | if (sd_bus_error_has_name(&error, SD_BUS_ERROR_SERVICE_UNKNOWN) || | |
125 | sd_bus_error_has_name(&error, SD_BUS_ERROR_NAME_HAS_NO_OWNER)) { | |
126 | pam_syslog(handle, LOG_DEBUG, "systemd-homed is not available: %s", bus_error_message(&error, r)); | |
127 | goto user_unknown; | |
128 | } | |
129 | ||
130 | if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_HOME)) { | |
131 | pam_syslog(handle, LOG_DEBUG, "Not a user managed by systemd-homed: %s", bus_error_message(&error, r)); | |
132 | goto user_unknown; | |
133 | } | |
134 | ||
135 | pam_syslog(handle, LOG_ERR, "Failed to query user record: %s", bus_error_message(&error, r)); | |
136 | return PAM_SERVICE_ERR; | |
137 | } | |
138 | ||
139 | r = sd_bus_message_read(reply, "sbo", &json, NULL, NULL); | |
140 | if (r < 0) | |
141 | return pam_bus_log_parse_error(handle, r); | |
142 | ||
dbe7fff4 LP |
143 | /* First copy: for the homed-specific data field, i.e. where we know the user record is from |
144 | * homed */ | |
26cf9fb7 LP |
145 | json_copy = strdup(json); |
146 | if (!json_copy) | |
147 | return pam_log_oom(handle); | |
148 | ||
dbe7fff4 | 149 | r = pam_set_data(handle, homed_field, json_copy, pam_cleanup_free); |
26cf9fb7 | 150 | if (r != PAM_SUCCESS) { |
dbe7fff4 LP |
151 | pam_syslog(handle, LOG_ERR, "Failed to set PAM user record data '%s': %s", |
152 | homed_field, pam_strerror(handle, r)); | |
26cf9fb7 LP |
153 | return r; |
154 | } | |
155 | ||
dbe7fff4 LP |
156 | /* Take a second copy: for the generic data field, the one which we share with |
157 | * pam_systemd. While we insist on only reusing homed records, pam_systemd is fine with homed | |
158 | * and non-homed user records. */ | |
159 | json_copy = strdup(json); | |
160 | if (!json_copy) | |
161 | return pam_log_oom(handle); | |
162 | ||
163 | generic_field = strjoin("systemd-user-record-", username); | |
164 | if (!generic_field) | |
165 | return pam_log_oom(handle); | |
26cf9fb7 | 166 | |
dbe7fff4 | 167 | r = pam_set_data(handle, generic_field, json_copy, pam_cleanup_free); |
26cf9fb7 | 168 | if (r != PAM_SUCCESS) { |
dbe7fff4 LP |
169 | pam_syslog(handle, LOG_ERR, "Failed to set PAM user record data '%s': %s", |
170 | homed_field, pam_strerror(handle, r)); | |
26cf9fb7 LP |
171 | return r; |
172 | } | |
dbe7fff4 LP |
173 | |
174 | TAKE_PTR(json_copy); | |
26cf9fb7 LP |
175 | } |
176 | ||
177 | r = json_parse(json, JSON_PARSE_SENSITIVE, &v, NULL, NULL); | |
178 | if (r < 0) { | |
179 | pam_syslog(handle, LOG_ERR, "Failed to parse JSON user record: %s", strerror_safe(r)); | |
180 | return PAM_SERVICE_ERR; | |
181 | } | |
182 | ||
183 | ur = user_record_new(); | |
184 | if (!ur) | |
185 | return pam_log_oom(handle); | |
186 | ||
187 | r = user_record_load(ur, v, USER_RECORD_LOAD_REFUSE_SECRET); | |
188 | if (r < 0) { | |
189 | pam_syslog(handle, LOG_ERR, "Failed to load user record: %s", strerror_safe(r)); | |
190 | return PAM_SERVICE_ERR; | |
191 | } | |
192 | ||
dbe7fff4 | 193 | /* Safety check if cached record actually matches what we are looking for */ |
26cf9fb7 LP |
194 | if (!streq_ptr(username, ur->user_name)) { |
195 | pam_syslog(handle, LOG_ERR, "Acquired user record does not match user name."); | |
196 | return PAM_SERVICE_ERR; | |
197 | } | |
198 | ||
199 | if (ret_record) | |
200 | *ret_record = TAKE_PTR(ur); | |
201 | ||
202 | return PAM_SUCCESS; | |
203 | ||
204 | user_unknown: | |
205 | /* Cache this, so that we don't check again */ | |
dbe7fff4 | 206 | r = pam_set_data(handle, homed_field, (void*) -1, NULL); |
26cf9fb7 | 207 | if (r != PAM_SUCCESS) |
dbe7fff4 LP |
208 | pam_syslog(handle, LOG_ERR, "Failed to set PAM user record data '%s' to invalid, ignoring: %s", |
209 | homed_field, pam_strerror(handle, r)); | |
26cf9fb7 LP |
210 | |
211 | return PAM_USER_UNKNOWN; | |
212 | } | |
213 | ||
dbe7fff4 LP |
214 | static int release_user_record(pam_handle_t *handle, const char *username) { |
215 | _cleanup_free_ char *homed_field = NULL, *generic_field = NULL; | |
26cf9fb7 LP |
216 | int r, k; |
217 | ||
dbe7fff4 LP |
218 | assert(handle); |
219 | assert(username); | |
220 | ||
221 | homed_field = strjoin("systemd-home-user-record-", username); | |
222 | if (!homed_field) | |
223 | return pam_log_oom(handle); | |
224 | ||
225 | r = pam_set_data(handle, homed_field, NULL, NULL); | |
26cf9fb7 | 226 | if (r != PAM_SUCCESS) |
dbe7fff4 LP |
227 | pam_syslog(handle, LOG_ERR, "Failed to release PAM user record data '%s': %s", homed_field, pam_strerror(handle, r)); |
228 | ||
229 | generic_field = strjoin("systemd-user-record-", username); | |
230 | if (!generic_field) | |
231 | return pam_log_oom(handle); | |
26cf9fb7 | 232 | |
dbe7fff4 | 233 | k = pam_set_data(handle, generic_field, NULL, NULL); |
26cf9fb7 | 234 | if (k != PAM_SUCCESS) |
dbe7fff4 | 235 | pam_syslog(handle, LOG_ERR, "Failed to release PAM user record data '%s': %s", generic_field, pam_strerror(handle, k)); |
26cf9fb7 LP |
236 | |
237 | return IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA) ? k : r; | |
238 | } | |
239 | ||
240 | static void cleanup_home_fd(pam_handle_t *handle, void *data, int error_status) { | |
241 | safe_close(PTR_TO_FD(data)); | |
242 | } | |
243 | ||
244 | static int handle_generic_user_record_error( | |
245 | pam_handle_t *handle, | |
246 | const char *user_name, | |
247 | UserRecord *secret, | |
248 | int ret, | |
249 | const sd_bus_error *error) { | |
250 | ||
251 | assert(user_name); | |
252 | assert(secret); | |
253 | assert(error); | |
254 | ||
255 | int r; | |
256 | ||
257 | /* Logs about all errors, except for PAM_CONV_ERR, i.e. when requesting more info failed. */ | |
258 | ||
259 | if (sd_bus_error_has_name(error, BUS_ERROR_HOME_ABSENT)) { | |
260 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Home of user %s is currently absent, please plug in the necessary storage device or backing file system.", user_name); | |
261 | pam_syslog(handle, LOG_ERR, "Failed to acquire home for user %s: %s", user_name, bus_error_message(error, ret)); | |
262 | return PAM_PERM_DENIED; | |
263 | ||
264 | } else if (sd_bus_error_has_name(error, BUS_ERROR_AUTHENTICATION_LIMIT_HIT)) { | |
265 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Too frequent unsuccessful login attempts for user %s, try again later.", user_name); | |
266 | pam_syslog(handle, LOG_ERR, "Failed to acquire home for user %s: %s", user_name, bus_error_message(error, ret)); | |
267 | return PAM_MAXTRIES; | |
268 | ||
269 | } else if (sd_bus_error_has_name(error, BUS_ERROR_BAD_PASSWORD)) { | |
270 | _cleanup_(erase_and_freep) char *newp = NULL; | |
271 | ||
272 | /* This didn't work? Ask for an (additional?) password */ | |
273 | ||
274 | if (strv_isempty(secret->password)) | |
275 | r = pam_prompt(handle, PAM_PROMPT_ECHO_OFF, &newp, "Password: "); | |
d4232943 JS |
276 | else { |
277 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Password incorrect or not sufficient for authentication of user %s.", user_name); | |
278 | r = pam_prompt(handle, PAM_PROMPT_ECHO_OFF, &newp, "Sorry, try again: "); | |
279 | } | |
26cf9fb7 LP |
280 | if (r != PAM_SUCCESS) |
281 | return PAM_CONV_ERR; /* no logging here */ | |
282 | ||
283 | if (isempty(newp)) { | |
284 | pam_syslog(handle, LOG_DEBUG, "Password request aborted."); | |
285 | return PAM_AUTHTOK_ERR; | |
286 | } | |
287 | ||
288 | r = user_record_set_password(secret, STRV_MAKE(newp), true); | |
289 | if (r < 0) { | |
290 | pam_syslog(handle, LOG_ERR, "Failed to store password: %s", strerror_safe(r)); | |
291 | return PAM_SERVICE_ERR; | |
292 | } | |
293 | ||
294 | } else if (sd_bus_error_has_name(error, BUS_ERROR_BAD_PASSWORD_AND_NO_TOKEN)) { | |
295 | _cleanup_(erase_and_freep) char *newp = NULL; | |
296 | ||
d4232943 JS |
297 | if (strv_isempty(secret->password)) { |
298 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Security token of user %s not inserted.", user_name); | |
299 | r = pam_prompt(handle, PAM_PROMPT_ECHO_OFF, &newp, "Try again with password: "); | |
300 | } else { | |
301 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Password incorrect or not sufficient, and configured security token of user %s not inserted.", user_name); | |
302 | r = pam_prompt(handle, PAM_PROMPT_ECHO_OFF, &newp, "Try again with password: "); | |
303 | } | |
26cf9fb7 LP |
304 | if (r != PAM_SUCCESS) |
305 | return PAM_CONV_ERR; /* no logging here */ | |
306 | ||
307 | if (isempty(newp)) { | |
308 | pam_syslog(handle, LOG_DEBUG, "Password request aborted."); | |
309 | return PAM_AUTHTOK_ERR; | |
310 | } | |
311 | ||
312 | r = user_record_set_password(secret, STRV_MAKE(newp), true); | |
313 | if (r < 0) { | |
314 | pam_syslog(handle, LOG_ERR, "Failed to store password: %s", strerror_safe(r)); | |
315 | return PAM_SERVICE_ERR; | |
316 | } | |
317 | ||
318 | } else if (sd_bus_error_has_name(error, BUS_ERROR_TOKEN_PIN_NEEDED)) { | |
319 | _cleanup_(erase_and_freep) char *newp = NULL; | |
320 | ||
d4232943 | 321 | r = pam_prompt(handle, PAM_PROMPT_ECHO_OFF, &newp, "Security token PIN: "); |
26cf9fb7 LP |
322 | if (r != PAM_SUCCESS) |
323 | return PAM_CONV_ERR; /* no logging here */ | |
324 | ||
325 | if (isempty(newp)) { | |
326 | pam_syslog(handle, LOG_DEBUG, "PIN request aborted."); | |
327 | return PAM_AUTHTOK_ERR; | |
328 | } | |
329 | ||
330 | r = user_record_set_pkcs11_pin(secret, STRV_MAKE(newp), false); | |
331 | if (r < 0) { | |
332 | pam_syslog(handle, LOG_ERR, "Failed to store PIN: %s", strerror_safe(r)); | |
333 | return PAM_SERVICE_ERR; | |
334 | } | |
335 | ||
336 | } else if (sd_bus_error_has_name(error, BUS_ERROR_TOKEN_PROTECTED_AUTHENTICATION_PATH_NEEDED)) { | |
337 | ||
338 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Please authenticate physically on security token of user %s.", user_name); | |
339 | ||
340 | r = user_record_set_pkcs11_protected_authentication_path_permitted(secret, true); | |
341 | if (r < 0) { | |
342 | pam_syslog(handle, LOG_ERR, "Failed to set PKCS#11 protected authentication path permitted flag: %s", strerror_safe(r)); | |
343 | return PAM_SERVICE_ERR; | |
344 | } | |
345 | ||
346 | } else if (sd_bus_error_has_name(error, BUS_ERROR_TOKEN_BAD_PIN)) { | |
347 | _cleanup_(erase_and_freep) char *newp = NULL; | |
348 | ||
d4232943 JS |
349 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Security token PIN incorrect for user %s.", user_name); |
350 | r = pam_prompt(handle, PAM_PROMPT_ECHO_OFF, &newp, "Sorry, retry security token PIN: "); | |
26cf9fb7 LP |
351 | if (r != PAM_SUCCESS) |
352 | return PAM_CONV_ERR; /* no logging here */ | |
353 | ||
354 | if (isempty(newp)) { | |
355 | pam_syslog(handle, LOG_DEBUG, "PIN request aborted."); | |
356 | return PAM_AUTHTOK_ERR; | |
357 | } | |
358 | ||
359 | r = user_record_set_pkcs11_pin(secret, STRV_MAKE(newp), false); | |
360 | if (r < 0) { | |
361 | pam_syslog(handle, LOG_ERR, "Failed to store PIN: %s", strerror_safe(r)); | |
362 | return PAM_SERVICE_ERR; | |
363 | } | |
364 | ||
365 | } else if (sd_bus_error_has_name(error, BUS_ERROR_TOKEN_BAD_PIN_FEW_TRIES_LEFT)) { | |
366 | _cleanup_(erase_and_freep) char *newp = NULL; | |
367 | ||
d4232943 JS |
368 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Security token PIN of user %s incorrect (only a few tries left!)", user_name); |
369 | r = pam_prompt(handle, PAM_PROMPT_ECHO_OFF, &newp, "Sorry, retry security token PIN: "); | |
26cf9fb7 LP |
370 | if (r != PAM_SUCCESS) |
371 | return PAM_CONV_ERR; /* no logging here */ | |
372 | ||
373 | if (isempty(newp)) { | |
374 | pam_syslog(handle, LOG_DEBUG, "PIN request aborted."); | |
375 | return PAM_AUTHTOK_ERR; | |
376 | } | |
377 | ||
378 | r = user_record_set_pkcs11_pin(secret, STRV_MAKE(newp), false); | |
379 | if (r < 0) { | |
380 | pam_syslog(handle, LOG_ERR, "Failed to store PIN: %s", strerror_safe(r)); | |
381 | return PAM_SERVICE_ERR; | |
382 | } | |
383 | ||
384 | } else if (sd_bus_error_has_name(error, BUS_ERROR_TOKEN_BAD_PIN_ONE_TRY_LEFT)) { | |
385 | _cleanup_(erase_and_freep) char *newp = NULL; | |
386 | ||
d4232943 JS |
387 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Security token PIN of user %s incorrect (only one try left!)", user_name); |
388 | r = pam_prompt(handle, PAM_PROMPT_ECHO_OFF, &newp, "Sorry, retry security token PIN: "); | |
26cf9fb7 LP |
389 | if (r != PAM_SUCCESS) |
390 | return PAM_CONV_ERR; /* no logging here */ | |
391 | ||
392 | if (isempty(newp)) { | |
393 | pam_syslog(handle, LOG_DEBUG, "PIN request aborted."); | |
394 | return PAM_AUTHTOK_ERR; | |
395 | } | |
396 | ||
397 | r = user_record_set_pkcs11_pin(secret, STRV_MAKE(newp), false); | |
398 | if (r < 0) { | |
399 | pam_syslog(handle, LOG_ERR, "Failed to store PIN: %s", strerror_safe(r)); | |
400 | return PAM_SERVICE_ERR; | |
401 | } | |
402 | ||
403 | } else { | |
404 | pam_syslog(handle, LOG_ERR, "Failed to acquire home for user %s: %s", user_name, bus_error_message(error, ret)); | |
405 | return PAM_SERVICE_ERR; | |
406 | } | |
407 | ||
408 | return PAM_SUCCESS; | |
409 | } | |
410 | ||
411 | static int acquire_home( | |
412 | pam_handle_t *handle, | |
413 | bool please_authenticate, | |
414 | bool please_suspend, | |
415 | bool debug) { | |
416 | ||
417 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL, *secret = NULL; | |
418 | bool do_auth = please_authenticate, home_not_active = false, home_locked = false; | |
419 | _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL; | |
420 | _cleanup_close_ int acquired_fd = -1; | |
421 | const void *home_fd_ptr = NULL; | |
422 | unsigned n_attempts = 0; | |
423 | int r; | |
424 | ||
425 | assert(handle); | |
426 | ||
427 | /* This acquires a reference to a home directory in one of two ways: if please_authenticate is true, | |
428 | * then we'll call AcquireHome() after asking the user for a password. Otherwise it tries to call | |
429 | * RefHome() and if that fails queries the user for a password and uses AcquireHome(). | |
430 | * | |
431 | * The idea is that the PAM authentication hook sets please_authenticate and thus always | |
432 | * authenticates, while the other PAM hooks unset it so that they can a ref of their own without | |
433 | * authentication if possible, but with authentication if necessary. */ | |
434 | ||
435 | /* If we already have acquired the fd, let's shortcut this */ | |
436 | r = pam_get_data(handle, "systemd-home-fd", &home_fd_ptr); | |
da4340fd | 437 | if (r == PAM_SUCCESS && PTR_TO_FD(home_fd_ptr) >= 0) |
26cf9fb7 LP |
438 | return PAM_SUCCESS; |
439 | ||
440 | r = pam_acquire_bus_connection(handle, &bus); | |
441 | if (r != PAM_SUCCESS) | |
442 | return r; | |
443 | ||
444 | r = acquire_user_record(handle, &ur); | |
445 | if (r != PAM_SUCCESS) | |
446 | return r; | |
447 | ||
448 | /* Implement our own retry loop here instead of relying on the PAM client's one. That's because it | |
449 | * might happen that the the record we stored on the host does not match the encryption password of | |
450 | * the LUKS image in case the image was used in a different system where the password was | |
451 | * changed. In that case it will happen that the LUKS password and the host password are | |
452 | * different, and we handle that by collecting and passing multiple passwords in that case. Hence we | |
453 | * treat bad passwords as a request to collect one more password and pass the new all all previously | |
454 | * used passwords again. */ | |
455 | ||
456 | for (;;) { | |
457 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; | |
458 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
459 | ||
460 | if (do_auth && !secret) { | |
461 | const char *cached_password = NULL; | |
462 | ||
463 | secret = user_record_new(); | |
464 | if (!secret) | |
465 | return pam_log_oom(handle); | |
466 | ||
467 | /* If there's already a cached password, use it. But if not let's authenticate | |
468 | * without anything, maybe some other authentication mechanism systemd-homed | |
469 | * implements (such as PKCS#11) allows us to authenticate without anything else. */ | |
470 | r = pam_get_item(handle, PAM_AUTHTOK, (const void**) &cached_password); | |
471 | if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS)) { | |
472 | pam_syslog(handle, LOG_ERR, "Failed to get cached password: %s", pam_strerror(handle, r)); | |
473 | return r; | |
474 | } | |
475 | ||
476 | if (!isempty(cached_password)) { | |
477 | r = user_record_set_password(secret, STRV_MAKE(cached_password), true); | |
478 | if (r < 0) { | |
479 | pam_syslog(handle, LOG_ERR, "Failed to store password: %s", strerror_safe(r)); | |
480 | return PAM_SERVICE_ERR; | |
481 | } | |
482 | } | |
483 | } | |
484 | ||
8a1596aa | 485 | r = bus_message_new_method_call(bus, &m, bus_home_mgr, do_auth ? "AcquireHome" : "RefHome"); |
26cf9fb7 LP |
486 | if (r < 0) |
487 | return pam_bus_log_create_error(handle, r); | |
488 | ||
489 | r = sd_bus_message_append(m, "s", ur->user_name); | |
490 | if (r < 0) | |
491 | return pam_bus_log_create_error(handle, r); | |
492 | ||
493 | if (do_auth) { | |
494 | r = bus_message_append_secret(m, secret); | |
495 | if (r < 0) | |
496 | return pam_bus_log_create_error(handle, r); | |
497 | } | |
498 | ||
499 | r = sd_bus_message_append(m, "b", please_suspend); | |
500 | if (r < 0) | |
501 | return pam_bus_log_create_error(handle, r); | |
502 | ||
503 | r = sd_bus_call(bus, m, HOME_SLOW_BUS_CALL_TIMEOUT_USEC, &error, &reply); | |
504 | if (r < 0) { | |
505 | ||
506 | if (sd_bus_error_has_name(&error, BUS_ERROR_HOME_NOT_ACTIVE)) | |
507 | /* Only on RefHome(): We can't access the home directory currently, unless | |
508 | * it's unlocked with a password. Hence, let's try this again, this time with | |
509 | * authentication. */ | |
510 | home_not_active = true; | |
511 | else if (sd_bus_error_has_name(&error, BUS_ERROR_HOME_LOCKED)) | |
512 | home_locked = true; /* Similar */ | |
513 | else { | |
514 | r = handle_generic_user_record_error(handle, ur->user_name, secret, r, &error); | |
515 | if (r == PAM_CONV_ERR) { | |
516 | /* Password/PIN prompts will fail in certain environments, for example when | |
517 | * we are called from OpenSSH's account or session hooks, or in systemd's | |
518 | * per-service PAM logic. In that case, print a friendly message and accept | |
519 | * failure. */ | |
520 | ||
521 | if (home_not_active) | |
522 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Home of user %s is currently not active, please log in locally first.", ur->user_name); | |
523 | if (home_locked) | |
524 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Home of user %s is currently locked, please unlock locally first.", ur->user_name); | |
525 | ||
526 | pam_syslog(handle, please_authenticate ? LOG_ERR : LOG_DEBUG, "Failed to prompt for password/prompt."); | |
527 | ||
528 | return home_not_active || home_locked ? PAM_PERM_DENIED : PAM_CONV_ERR; | |
529 | } | |
530 | if (r != PAM_SUCCESS) | |
531 | return r; | |
532 | } | |
533 | ||
534 | } else { | |
535 | int fd; | |
536 | ||
537 | r = sd_bus_message_read(reply, "h", &fd); | |
538 | if (r < 0) | |
539 | return pam_bus_log_parse_error(handle, r); | |
540 | ||
541 | acquired_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
542 | if (acquired_fd < 0) { | |
543 | pam_syslog(handle, LOG_ERR, "Failed to duplicate acquired fd: %s", bus_error_message(&error, r)); | |
544 | return PAM_SERVICE_ERR; | |
545 | } | |
546 | ||
547 | break; | |
548 | } | |
549 | ||
550 | if (++n_attempts >= 5) { | |
551 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Too many unsuccessful login attempts for user %s, refusing.", ur->user_name); | |
552 | pam_syslog(handle, LOG_ERR, "Failed to acquire home for user %s: %s", ur->user_name, bus_error_message(&error, r)); | |
553 | return PAM_MAXTRIES; | |
554 | } | |
555 | ||
556 | /* Try again, this time with authentication if we didn't do that before. */ | |
557 | do_auth = true; | |
558 | } | |
559 | ||
560 | r = pam_set_data(handle, "systemd-home-fd", FD_TO_PTR(acquired_fd), cleanup_home_fd); | |
561 | if (r < 0) { | |
562 | pam_syslog(handle, LOG_ERR, "Failed to set PAM bus data: %s", pam_strerror(handle, r)); | |
563 | return r; | |
564 | } | |
565 | TAKE_FD(acquired_fd); | |
566 | ||
567 | if (do_auth) { | |
568 | /* We likely just activated the home directory, let's flush out the user record, since a | |
569 | * newer embedded user record might have been acquired from the activation. */ | |
570 | ||
dbe7fff4 | 571 | r = release_user_record(handle, ur->user_name); |
26cf9fb7 LP |
572 | if (!IN_SET(r, PAM_SUCCESS, PAM_NO_MODULE_DATA)) |
573 | return r; | |
574 | } | |
575 | ||
576 | pam_syslog(handle, LOG_NOTICE, "Home for user %s successfully acquired.", ur->user_name); | |
577 | ||
578 | return PAM_SUCCESS; | |
579 | } | |
580 | ||
581 | static int release_home_fd(pam_handle_t *handle) { | |
582 | const void *home_fd_ptr = NULL; | |
583 | int r; | |
584 | ||
585 | r = pam_get_data(handle, "systemd-home-fd", &home_fd_ptr); | |
586 | if (r == PAM_NO_MODULE_DATA || PTR_TO_FD(home_fd_ptr) < 0) | |
587 | return PAM_NO_MODULE_DATA; | |
588 | ||
589 | r = pam_set_data(handle, "systemd-home-fd", NULL, NULL); | |
590 | if (r != PAM_SUCCESS) | |
591 | pam_syslog(handle, LOG_ERR, "Failed to release PAM home reference fd: %s", pam_strerror(handle, r)); | |
592 | ||
593 | return r; | |
594 | } | |
595 | ||
596 | _public_ PAM_EXTERN int pam_sm_authenticate( | |
597 | pam_handle_t *handle, | |
598 | int flags, | |
599 | int argc, const char **argv) { | |
600 | ||
601 | bool debug = false, suspend_please = false; | |
602 | ||
603 | if (parse_argv(handle, | |
604 | argc, argv, | |
605 | &suspend_please, | |
606 | &debug) < 0) | |
607 | return PAM_AUTH_ERR; | |
608 | ||
609 | if (debug) | |
610 | pam_syslog(handle, LOG_DEBUG, "pam-systemd-homed authenticating"); | |
611 | ||
612 | return acquire_home(handle, /* please_authenticate= */ true, suspend_please, debug); | |
613 | } | |
614 | ||
615 | _public_ PAM_EXTERN int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv) { | |
616 | return PAM_SUCCESS; | |
617 | } | |
618 | ||
619 | _public_ PAM_EXTERN int pam_sm_open_session( | |
620 | pam_handle_t *handle, | |
621 | int flags, | |
622 | int argc, const char **argv) { | |
623 | ||
624 | bool debug = false, suspend_please = false; | |
625 | int r; | |
626 | ||
627 | if (parse_argv(handle, | |
628 | argc, argv, | |
629 | &suspend_please, | |
630 | &debug) < 0) | |
631 | return PAM_SESSION_ERR; | |
632 | ||
633 | if (debug) | |
634 | pam_syslog(handle, LOG_DEBUG, "pam-systemd-homed session start"); | |
635 | ||
636 | r = acquire_home(handle, /* please_authenticate = */ false, suspend_please, debug); | |
637 | if (r == PAM_USER_UNKNOWN) /* Not managed by us? Don't complain. */ | |
638 | return PAM_SUCCESS; | |
639 | if (r != PAM_SUCCESS) | |
640 | return r; | |
641 | ||
642 | r = pam_putenv(handle, "SYSTEMD_HOME=1"); | |
643 | if (r != PAM_SUCCESS) { | |
644 | pam_syslog(handle, LOG_ERR, "Failed to set PAM environment variable $SYSTEMD_HOME: %s", pam_strerror(handle, r)); | |
645 | return r; | |
646 | } | |
647 | ||
648 | /* Let's release the D-Bus connection, after all the session might live quite a long time, and we are | |
649 | * not going to process the bus connection in that time, so let's better close before the daemon | |
650 | * kicks us off because we are not processing anything. */ | |
651 | (void) pam_release_bus_connection(handle); | |
652 | return PAM_SUCCESS; | |
653 | } | |
654 | ||
655 | _public_ PAM_EXTERN int pam_sm_close_session( | |
656 | pam_handle_t *handle, | |
657 | int flags, | |
658 | int argc, const char **argv) { | |
659 | ||
660 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
661 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; | |
662 | _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL; | |
663 | const char *username = NULL; | |
664 | bool debug = false; | |
665 | int r; | |
666 | ||
667 | if (parse_argv(handle, | |
668 | argc, argv, | |
669 | NULL, | |
670 | &debug) < 0) | |
671 | return PAM_SESSION_ERR; | |
672 | ||
673 | if (debug) | |
674 | pam_syslog(handle, LOG_DEBUG, "pam-systemd-homed session end"); | |
675 | ||
676 | /* Let's explicitly drop the reference to the homed session, so that the subsequent ReleaseHome() | |
677 | * call will be able to do its thing. */ | |
678 | r = release_home_fd(handle); | |
679 | if (r == PAM_NO_MODULE_DATA) /* Nothing to do, we never acquired an fd */ | |
680 | return PAM_SUCCESS; | |
681 | if (r != PAM_SUCCESS) | |
682 | return r; | |
683 | ||
684 | r = pam_get_user(handle, &username, NULL); | |
685 | if (r != PAM_SUCCESS) { | |
686 | pam_syslog(handle, LOG_ERR, "Failed to get user name: %s", pam_strerror(handle, r)); | |
687 | return r; | |
688 | } | |
689 | ||
690 | r = pam_acquire_bus_connection(handle, &bus); | |
691 | if (r != PAM_SUCCESS) | |
692 | return r; | |
693 | ||
8a1596aa | 694 | r = bus_message_new_method_call(bus, &m, bus_home_mgr, "ReleaseHome"); |
26cf9fb7 LP |
695 | if (r < 0) |
696 | return pam_bus_log_create_error(handle, r); | |
697 | ||
698 | r = sd_bus_message_append(m, "s", username); | |
699 | if (r < 0) | |
700 | return pam_bus_log_create_error(handle, r); | |
701 | ||
702 | r = sd_bus_call(bus, m, HOME_SLOW_BUS_CALL_TIMEOUT_USEC, &error, NULL); | |
703 | if (r < 0) { | |
704 | if (sd_bus_error_has_name(&error, BUS_ERROR_HOME_BUSY)) | |
705 | pam_syslog(handle, LOG_NOTICE, "Not deactivating home directory of %s, as it is still used.", username); | |
706 | else { | |
707 | pam_syslog(handle, LOG_ERR, "Failed to release user home: %s", bus_error_message(&error, r)); | |
708 | return PAM_SESSION_ERR; | |
709 | } | |
710 | } | |
711 | ||
712 | return PAM_SUCCESS; | |
713 | } | |
714 | ||
715 | _public_ PAM_EXTERN int pam_sm_acct_mgmt( | |
716 | pam_handle_t *handle, | |
717 | int flags, | |
718 | int argc, | |
719 | const char **argv) { | |
720 | ||
721 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL; | |
722 | bool debug = false, please_suspend = false; | |
723 | usec_t t; | |
724 | int r; | |
725 | ||
726 | if (parse_argv(handle, | |
727 | argc, argv, | |
728 | &please_suspend, | |
729 | &debug) < 0) | |
730 | return PAM_AUTH_ERR; | |
731 | ||
732 | if (debug) | |
733 | pam_syslog(handle, LOG_DEBUG, "pam-systemd-homed account management"); | |
734 | ||
735 | r = acquire_home(handle, /* please_authenticate = */ false, please_suspend, debug); | |
736 | if (r == PAM_USER_UNKNOWN) | |
737 | return PAM_SUCCESS; /* we don't have anything to say about users we don't manage */ | |
738 | if (r != PAM_SUCCESS) | |
739 | return r; | |
740 | ||
741 | r = acquire_user_record(handle, &ur); | |
742 | if (r != PAM_SUCCESS) | |
743 | return r; | |
744 | ||
745 | r = user_record_test_blocked(ur); | |
746 | switch (r) { | |
747 | ||
748 | case -ESTALE: | |
749 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "User record is newer than current system time, prohibiting access."); | |
750 | return PAM_ACCT_EXPIRED; | |
751 | ||
752 | case -ENOLCK: | |
753 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "User record is blocked, prohibiting access."); | |
754 | return PAM_ACCT_EXPIRED; | |
755 | ||
756 | case -EL2HLT: | |
757 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "User record is not valid yet, prohibiting access."); | |
758 | return PAM_ACCT_EXPIRED; | |
759 | ||
760 | case -EL3HLT: | |
761 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "User record is not valid anymore, prohibiting access."); | |
762 | return PAM_ACCT_EXPIRED; | |
763 | ||
764 | default: | |
765 | if (r < 0) { | |
766 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "User record not valid, prohibiting access."); | |
767 | return PAM_ACCT_EXPIRED; | |
768 | } | |
769 | ||
770 | break; | |
771 | } | |
772 | ||
773 | t = user_record_ratelimit_next_try(ur); | |
774 | if (t != USEC_INFINITY) { | |
775 | usec_t n = now(CLOCK_REALTIME); | |
776 | ||
777 | if (t > n) { | |
778 | char buf[FORMAT_TIMESPAN_MAX]; | |
779 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Too many logins, try again in %s.", | |
780 | format_timespan(buf, sizeof(buf), t - n, USEC_PER_SEC)); | |
781 | ||
782 | return PAM_MAXTRIES; | |
783 | } | |
784 | } | |
785 | ||
786 | r = user_record_test_password_change_required(ur); | |
787 | switch (r) { | |
788 | ||
789 | case -EKEYREVOKED: | |
790 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Password change required."); | |
791 | return PAM_NEW_AUTHTOK_REQD; | |
792 | ||
793 | case -EOWNERDEAD: | |
794 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Password expired, change requird."); | |
795 | return PAM_NEW_AUTHTOK_REQD; | |
796 | ||
797 | case -EKEYREJECTED: | |
798 | /* Strictly speaking this is only about password expiration, and we might want to allow | |
799 | * authentication via PKCS#11 or so, but let's ignore this fine distinction for now. */ | |
800 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Password is expired, but can't change, refusing login."); | |
801 | return PAM_AUTHTOK_EXPIRED; | |
802 | ||
803 | case -EKEYEXPIRED: | |
804 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "Password will expire soon, please change."); | |
805 | break; | |
806 | ||
807 | case -EROFS: | |
808 | /* All good, just means the password if we wanted to change we couldn't, but we don't need to */ | |
809 | break; | |
810 | ||
811 | default: | |
812 | if (r < 0) { | |
813 | (void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "User record not valid, prohibiting access."); | |
814 | return PAM_AUTHTOK_EXPIRED; | |
815 | } | |
816 | ||
817 | break; | |
818 | } | |
819 | ||
820 | return PAM_SUCCESS; | |
821 | } | |
822 | ||
823 | _public_ PAM_EXTERN int pam_sm_chauthtok( | |
824 | pam_handle_t *handle, | |
825 | int flags, | |
826 | int argc, | |
827 | const char **argv) { | |
828 | ||
829 | _cleanup_(user_record_unrefp) UserRecord *ur = NULL, *old_secret = NULL, *new_secret = NULL; | |
830 | const char *old_password = NULL, *new_password = NULL; | |
831 | _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL; | |
832 | unsigned n_attempts = 0; | |
833 | bool debug = false; | |
834 | int r; | |
835 | ||
836 | if (parse_argv(handle, | |
837 | argc, argv, | |
838 | NULL, | |
839 | &debug) < 0) | |
840 | return PAM_AUTH_ERR; | |
841 | ||
842 | if (debug) | |
843 | pam_syslog(handle, LOG_DEBUG, "pam-systemd-homed account management"); | |
844 | ||
845 | r = pam_acquire_bus_connection(handle, &bus); | |
846 | if (r != PAM_SUCCESS) | |
847 | return r; | |
848 | ||
849 | r = acquire_user_record(handle, &ur); | |
850 | if (r != PAM_SUCCESS) | |
851 | return r; | |
852 | ||
853 | /* Start with cached credentials */ | |
854 | r = pam_get_item(handle, PAM_OLDAUTHTOK, (const void**) &old_password); | |
855 | if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS)) { | |
856 | pam_syslog(handle, LOG_ERR, "Failed to get old password: %s", pam_strerror(handle, r)); | |
857 | return r; | |
858 | } | |
859 | r = pam_get_item(handle, PAM_AUTHTOK, (const void**) &new_password); | |
860 | if (!IN_SET(r, PAM_BAD_ITEM, PAM_SUCCESS)) { | |
861 | pam_syslog(handle, LOG_ERR, "Failed to get cached password: %s", pam_strerror(handle, r)); | |
862 | return r; | |
863 | } | |
864 | ||
865 | if (isempty(new_password)) { | |
866 | /* No, it's not cached, then let's ask for the password and its verification, and cache | |
867 | * it. */ | |
868 | ||
869 | r = pam_get_authtok_noverify(handle, &new_password, "New password: "); | |
870 | if (r != PAM_SUCCESS) { | |
871 | pam_syslog(handle, LOG_ERR, "Failed to get new password: %s", pam_strerror(handle, r)); | |
872 | return r; | |
873 | } | |
874 | if (isempty(new_password)) { | |
875 | pam_syslog(handle, LOG_DEBUG, "Password request aborted."); | |
876 | return PAM_AUTHTOK_ERR; | |
877 | } | |
878 | ||
879 | r = pam_get_authtok_verify(handle, &new_password, "new password: "); /* Lower case, since PAM prefixes 'Repeat' */ | |
880 | if (r != PAM_SUCCESS) { | |
881 | pam_syslog(handle, LOG_ERR, "Failed to get password again: %s", pam_strerror(handle, r)); | |
882 | return r; | |
883 | } | |
884 | ||
885 | // FIXME: pam_pwquality will ask for the password a third time. It really shouldn't do | |
886 | // that, and instead assume the password was already verified once when it is found to be | |
887 | // cached already. needs to be fixed in pam_pwquality | |
888 | } | |
889 | ||
890 | /* Now everything is cached and checked, let's exit from the preliminary check */ | |
891 | if (FLAGS_SET(flags, PAM_PRELIM_CHECK)) | |
892 | return PAM_SUCCESS; | |
893 | ||
26cf9fb7 LP |
894 | old_secret = user_record_new(); |
895 | if (!old_secret) | |
896 | return pam_log_oom(handle); | |
897 | ||
898 | if (!isempty(old_password)) { | |
899 | r = user_record_set_password(old_secret, STRV_MAKE(old_password), true); | |
900 | if (r < 0) { | |
901 | pam_syslog(handle, LOG_ERR, "Failed to store old password: %s", strerror_safe(r)); | |
902 | return PAM_SERVICE_ERR; | |
903 | } | |
904 | } | |
905 | ||
906 | new_secret = user_record_new(); | |
907 | if (!new_secret) | |
908 | return pam_log_oom(handle); | |
909 | ||
910 | r = user_record_set_password(new_secret, STRV_MAKE(new_password), true); | |
911 | if (r < 0) { | |
912 | pam_syslog(handle, LOG_ERR, "Failed to store new password: %s", strerror_safe(r)); | |
913 | return PAM_SERVICE_ERR; | |
914 | } | |
915 | ||
916 | for (;;) { | |
917 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
918 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; | |
919 | ||
8a1596aa | 920 | r = bus_message_new_method_call(bus, &m, bus_home_mgr, "ChangePasswordHome"); |
26cf9fb7 LP |
921 | if (r < 0) |
922 | return pam_bus_log_create_error(handle, r); | |
923 | ||
924 | r = sd_bus_message_append(m, "s", ur->user_name); | |
925 | if (r < 0) | |
926 | return pam_bus_log_create_error(handle, r); | |
927 | ||
928 | r = bus_message_append_secret(m, new_secret); | |
929 | if (r < 0) | |
930 | return pam_bus_log_create_error(handle, r); | |
931 | ||
932 | r = bus_message_append_secret(m, old_secret); | |
933 | if (r < 0) | |
934 | return pam_bus_log_create_error(handle, r); | |
935 | ||
936 | r = sd_bus_call(bus, m, HOME_SLOW_BUS_CALL_TIMEOUT_USEC, &error, NULL); | |
937 | if (r < 0) { | |
938 | r = handle_generic_user_record_error(handle, ur->user_name, old_secret, r, &error); | |
939 | if (r == PAM_CONV_ERR) { | |
940 | pam_syslog(handle, LOG_ERR, "Failed to prompt for password/prompt."); | |
941 | return PAM_CONV_ERR; | |
942 | } | |
943 | if (r != PAM_SUCCESS) | |
944 | return r; | |
945 | } else { | |
946 | pam_syslog(handle, LOG_NOTICE, "Successfully changed password for user %s.", ur->user_name); | |
947 | return PAM_SUCCESS; | |
948 | } | |
949 | ||
950 | if (++n_attempts >= 5) | |
951 | break; | |
952 | ||
953 | /* Try again */ | |
954 | }; | |
955 | ||
956 | pam_syslog(handle, LOG_NOTICE, "Failed to change password for user %s: %m", ur->user_name); | |
957 | return PAM_MAXTRIES; | |
958 | } |