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- Committer: Teddy Hogeborn
- Date: 2008-09-05 08:38:30 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905083830-6y9v2rb2us0m45kn
* Makefile (PIDDIR, USER, GROUP): New variables.
(install-server): Create $(PIDDIR). Copy "init.d-mandos" and
"default-mandos" into place. Install init script
using "update-rc.d".
(uninstall-server): Remove links to init script using "update-rc.d".
(purge-server): Remove /etc/init.d/mandos and /etc/default/mandos.
* default-mandos: New file. Will install as "/etc/default/mandos".
* init.d-mandos: - '' - "/etc/init.d/mandos".
(install-server): Create $(PIDDIR). Copy "init.d-mandos" and
"default-mandos" into place. Install init script
using "update-rc.d".
(uninstall-server): Remove links to init script using "update-rc.d".
(purge-server): Remove /etc/init.d/mandos and /etc/default/mandos.
* default-mandos: New file. Will install as "/etc/default/mandos".
* init.d-mandos: - '' - "/etc/init.d/mandos".
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
83
76
84
77
typedef struct plugin{
85
78
char *name; /* can be NULL or any plugin name */
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
96
89
size_t buffer_size;
97
90
size_t buffer_length;
98
91
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
92
volatile bool completed;
93
volatile int status;
101
94
struct plugin *next;
102
95
} plugin;
103
96
104
97
static plugin *plugin_list = NULL;
105
98
106
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
107
100
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
101
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
114
106
return p;
115
107
}
116
108
}
117
109
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
123
112
return NULL;
124
113
}
125
114
char *copy_name = NULL;
126
115
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
130
117
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
118
return NULL;
135
119
}
136
120
}
137
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
142
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
148
129
free(copy_name);
149
130
free(new_plugin);
150
errno = e;
151
131
return NULL;
152
132
}
153
133
new_plugin->argv[0] = copy_name;
154
134
new_plugin->argv[1] = NULL;
155
135
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
159
137
if(new_plugin->environ == NULL){
160
int e = errno;
161
138
free(copy_name);
162
139
free(new_plugin->argv);
163
140
free(new_plugin);
164
errno = e;
165
141
return NULL;
166
142
}
167
143
new_plugin->environ[0] = NULL;
172
148
}
173
149
174
150
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
151
static bool add_to_char_array(const char *new, char ***array,
177
152
int *len){
178
153
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
184
156
/* Malloc check */
185
if(new_array == NULL){
157
if(*array == NULL){
186
158
return false;
187
159
}
188
*array = new_array;
189
160
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
194
162
if(copy == NULL){
195
163
return false;
196
164
}
203
171
}
204
172
205
173
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
174
static bool add_argument(plugin *p, const char *arg){
208
175
if(p == NULL){
209
176
return false;
212
179
}
213
180
214
181
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
182
static bool add_environment(plugin *p, const char *def, bool replace){
217
183
if(p == NULL){
218
184
return false;
220
186
/* namelen = length of name of environment variable */
221
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
188
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
225
191
/* It already exists */
226
192
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
232
195
return false;
233
196
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
236
199
}
237
200
return true;
238
201
}
240
203
return add_to_char_array(def, &(p->environ), &(p->envc));
241
204
}
242
205
243
#ifndef O_CLOEXEC
244
206
/*
245
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
208
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
210
*/
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
252
214
/* If reading the flags failed, return error indication now. */
253
215
if(ret < 0){
254
216
return ret;
255
217
}
256
218
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
220
}
260
#endif /* not O_CLOEXEC */
261
221
262
222
263
223
/* Mark processes as completed when they exit, and save their exit
264
224
status. */
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
267
226
while(true){
268
227
plugin *proc = plugin_list;
269
228
int status;
273
232
break;
274
233
}
275
234
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
235
if (errno != ECHILD){
236
perror("waitpid");
279
237
}
280
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
281
240
}
282
241
283
242
/* A child exited, find it in process_list */
284
243
while(proc != NULL and proc->pid != pid){
285
244
proc = proc->next;
289
248
continue;
290
249
}
291
250
proc->status = status;
292
proc->completed = 1;
251
proc->completed = true;
293
252
}
294
errno = old_errno;
295
253
}
296
254
297
255
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
300
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
301
261
for(size_t written = 0; written < length; written += (size_t)ret){
302
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
303
263
length - written));
309
269
}
310
270
311
271
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
272
static void free_plugin(plugin *plugin_node){
314
273
315
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
321
280
}
322
281
free(plugin_node->environ);
323
282
free(plugin_node->buffer);
324
283
325
284
/* Removes the plugin from the singly-linked list */
326
285
if(plugin_node == plugin_list){
327
286
/* First one - simple */
349
308
char *plugindir = NULL;
350
309
char *argfile = NULL;
351
310
FILE *conffp;
352
struct dirent **direntries = NULL;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
353
314
struct stat st;
354
315
fd_set rfds_all;
355
316
int ret, maxfd = 0;
356
ssize_t sret;
357
317
uid_t uid = 65534;
358
318
gid_t gid = 65534;
359
319
bool debug = false;
363
323
.sa_flags = SA_NOCLDSTOP };
364
324
char **custom_argv = NULL;
365
325
int custom_argc = 0;
366
int dir_fd = -1;
367
326
368
327
/* Establish a signal handler */
369
328
sigemptyset(&sigchld_action.sa_mask);
370
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
330
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
374
333
goto fallback;
375
334
}
376
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
336
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
380
339
goto fallback;
381
340
}
382
341
414
373
.doc = "Group ID the plugins will run as", .group = 3 },
415
374
{ .name = "debug", .key = 132,
416
375
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
426
376
{ .name = NULL }
427
377
};
428
378
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
435
382
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
441
392
}
442
393
}
443
errno = 0;
444
394
}
445
395
break;
446
396
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
449
408
}
450
409
break;
451
410
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
470
430
}
471
431
}
472
errno = 0;
473
432
}
474
433
break;
475
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
476
438
{
477
439
char *envdef = strchr(arg, ':');
478
440
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
484
447
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
492
450
}
493
451
}
494
452
break;
495
453
case 'd': /* --disable */
496
{
454
if (arg != NULL){
497
455
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
501
458
}
459
p->disabled = true;
502
460
}
503
461
break;
504
462
case 'e': /* --enable */
505
{
463
if (arg != NULL){
506
464
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
510
467
}
468
p->disabled = false;
511
469
}
512
470
break;
513
471
case 128: /* --plugin-dir */
514
free(plugindir);
515
472
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
473
if(plugindir == NULL){
474
perror("strdup");
475
}
519
476
break;
520
477
case 129: /* --config-file */
521
478
/* This is already done by parse_opt_config_file() */
522
479
break;
523
480
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
481
uid = (uid_t)strtol(arg, NULL, 10);
533
482
break;
534
483
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
484
gid = (gid_t)strtol(arg, NULL, 10);
544
485
break;
545
486
case 132: /* --debug */
546
487
debug = true;
547
488
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
489
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
573
494
default:
574
495
return ARGP_ERR_UNKNOWN;
575
496
}
576
return errno; /* Set to 0 at start */
497
return 0;
577
498
}
578
499
579
500
/* This option parser is the same as parse_opt() above, except it
580
501
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
586
506
case 'g': /* --global-options */
587
507
case 'G': /* --global-env */
588
508
case 'o': /* --options-for */
592
512
case 128: /* --plugin-dir */
593
513
break;
594
514
case 129: /* --config-file */
595
free(argfile);
596
515
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
516
if(argfile == NULL){
517
perror("strdup");
599
518
}
600
break;
519
break;
601
520
case 130: /* --userid */
602
521
case 131: /* --groupid */
603
522
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
608
525
break;
609
526
default:
610
527
return ARGP_ERR_UNKNOWN;
611
528
}
612
return errno;
529
return 0;
613
530
}
614
531
615
532
struct argp argp = { .options = options,
617
534
.args_doc = "",
618
535
.doc = "Mandos plugin runner -- Run plugins" };
619
536
620
/* Parse using parse_opt_config_file() in order to get the custom
537
/* Parse using the parse_opt_config_file in order to get the custom
621
538
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
636
543
goto fallback;
637
544
}
638
545
640
547
argp.parser = parse_opt;
641
548
642
549
/* Open the configfile if available */
643
if(argfile == NULL){
550
if (argfile == NULL){
644
551
conffp = fopen(AFILE, "r");
645
552
} else {
646
553
conffp = fopen(argfile, "r");
647
}
554
}
648
555
if(conffp != NULL){
649
556
char *org_line = NULL;
650
557
char *p, *arg, *new_arg, *line;
651
558
size_t size = 0;
559
ssize_t sret;
652
560
const char whitespace_delims[] = " \r\t\f\v\n";
653
561
const char comment_delim[] = "#";
654
562
655
563
custom_argc = 1;
656
564
custom_argv = malloc(sizeof(char*) * 2);
657
565
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
660
568
goto fallback;
661
569
}
662
570
custom_argv[0] = argv[0];
663
571
custom_argv[1] = NULL;
664
572
665
573
/* for each line in the config file, strip whitespace and ignore
666
574
commented text */
667
575
while(true){
669
577
if(sret == -1){
670
578
break;
671
579
}
672
580
673
581
line = org_line;
674
582
arg = strsep(&line, comment_delim);
675
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
678
586
}
679
587
new_arg = strdup(p);
680
588
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
683
591
free(org_line);
684
592
goto fallback;
685
593
}
686
594
687
595
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
701
603
}
702
604
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
704
606
}
705
607
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
714
608
free(org_line);
715
609
} else {
716
610
/* Check for harmful errors and go to fallback. Other errors might
717
611
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
721
615
goto fallback;
722
616
}
723
617
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
726
620
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
741
626
goto fallback;
742
627
}
743
628
}
744
629
745
630
/* Parse actual command line arguments, to let them override the
746
631
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
761
636
goto fallback;
762
637
}
763
638
768
643
for(char **a = p->argv; *a != NULL; a++){
769
644
fprintf(stderr, "\tArg: %s\n", *a);
770
645
}
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
772
647
for(char **a = p->environ; *a != NULL; a++){
773
648
fprintf(stderr, "\t%s\n", *a);
774
649
}
775
650
}
776
651
}
777
652
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
653
/* Strip permissions down to nobody */
807
654
ret = setuid(uid);
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
655
if (ret == -1){
656
perror("setuid");
657
}
658
setgid(gid);
659
if (ret == -1){
660
perror("setgid");
661
}
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
813
676
{
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
858
684
}
859
685
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
880
686
}
881
687
882
688
FD_ZERO(&rfds_all);
883
689
884
690
/* Read and execute any executable in the plugin directory*/
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
free(direntries[i]);
891
continue;
892
}
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
if(ret == -1){
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
898
continue;
899
}
900
691
while(true){
692
dirst = readdir(dir);
693
694
/* All directory entries have been processed */
695
if(dirst == NULL){
696
if (errno == EBADF){
697
perror("readdir");
698
exitstatus = EXIT_FAILURE;
699
goto fallback;
700
}
701
break;
702
}
703
704
d_name_len = strlen(dirst->d_name);
705
706
/* Ignore dotfiles, backup files and other junk */
707
{
708
bool bad_name = false;
709
710
const char const *bad_prefixes[] = { ".", "#", NULL };
711
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
713
".dpkg-old",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
719
if(debug){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
722
}
723
bad_name = true;
724
break;
725
}
726
}
727
if(bad_name){
728
continue;
729
}
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
734
== 0)){
735
if(debug){
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
738
}
739
bad_name = true;
740
break;
741
}
742
}
743
744
if(bad_name){
745
continue;
746
}
747
}
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
if(ret < 0){
752
perror("asprintf");
753
continue;
754
}
755
756
ret = stat(filename, &st);
757
if (ret == -1){
758
perror("stat");
759
free(filename);
760
continue;
761
}
762
901
763
/* Ignore non-executable files */
902
if(not S_ISREG(st.st_mode)
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
905
765
if(debug){
906
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
907
" with bad type or mode\n",
908
plugindir != NULL ? plugindir : PDIR,
909
direntries[i]->d_name);
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
910
768
}
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
769
free(filename);
913
770
continue;
914
771
}
915
772
916
plugin *p = getplugin(direntries[i]->d_name);
773
plugin *p = getplugin(dirst->d_name);
917
774
if(p == NULL){
918
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
775
perror("getplugin");
776
free(filename);
921
777
continue;
922
778
}
923
779
if(p->disabled){
924
780
if(debug){
925
781
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
926
direntries[i]->d_name);
782
dirst->d_name);
927
783
}
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
784
free(filename);
930
785
continue;
931
786
}
932
787
{
935
790
if(g != NULL){
936
791
for(char **a = g->argv + 1; *a != NULL; a++){
937
792
if(not add_argument(p, *a)){
938
error(0, errno, "add_argument");
793
perror("add_argument");
939
794
}
940
795
}
941
796
/* Add global environment variables */
942
797
for(char **e = g->environ; *e != NULL; e++){
943
798
if(not add_environment(p, *e, false)){
944
error(0, errno, "add_environment");
799
perror("add_environment");
945
800
}
946
801
}
947
802
}
948
803
}
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
806
process, too. */
951
807
if(p->environ[0] != NULL){
952
808
for(char **e = environ; *e != NULL; e++){
953
809
if(not add_environment(p, *e, false)){
954
error(0, errno, "add_environment");
810
perror("add_environment");
955
811
}
956
812
}
957
813
}
958
814
959
815
int pipefd[2];
960
#ifndef O_CLOEXEC
961
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
962
#else /* O_CLOEXEC */
963
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
964
#endif /* O_CLOEXEC */
965
if(ret == -1){
966
error(0, errno, "pipe");
967
exitstatus = EX_OSERR;
968
free(direntries[i]);
969
goto fallback;
970
}
971
if(pipefd[0] >= FD_SETSIZE){
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
976
exitstatus = EX_OSERR;
977
free(direntries[i]);
978
goto fallback;
979
}
980
#ifndef O_CLOEXEC
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
981
822
/* Ask OS to automatic close the pipe on exec */
982
823
ret = set_cloexec_flag(pipefd[0]);
983
824
if(ret < 0){
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
989
827
goto fallback;
990
828
}
991
829
ret = set_cloexec_flag(pipefd[1]);
992
830
if(ret < 0){
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
998
833
goto fallback;
999
834
}
1000
#endif /* not O_CLOEXEC */
1001
835
/* Block SIGCHLD until process is safely in process list */
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
&sigchld_action.sa_mask,
1004
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1005
837
if(ret < 0){
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1009
840
goto fallback;
1010
841
}
1011
842
/* Starting a new process to be watched */
1012
pid_t pid;
1013
do {
1014
pid = fork();
1015
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
1016
844
if(pid == -1){
1017
error(0, errno, "fork");
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1024
847
goto fallback;
1025
848
}
1026
849
if(pid == 0){
1027
850
/* this is the child process */
1028
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1029
852
if(ret < 0){
1030
error(0, errno, "sigaction");
1031
_exit(EX_OSERR);
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1032
855
}
1033
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1034
857
if(ret < 0){
1035
error(0, errno, "sigprocmask");
1036
_exit(EX_OSERR);
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1037
860
}
1038
861
1039
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1040
863
if(ret == -1){
1041
error(0, errno, "dup2");
1042
_exit(EX_OSERR);
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1043
866
}
1044
867
1045
if(fexecve(plugin_fd, p->argv,
1046
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1047
error(0, errno, "fexecve for %s/%s",
1048
plugindir != NULL ? plugindir : PDIR,
1049
direntries[i]->d_name);
1050
_exit(EX_OSERR);
868
if(dirfd(dir) < 0){
869
/* If dir has no file descriptor, we could not set FD_CLOEXEC
870
above and must now close it manually here. */
871
closedir(dir);
872
}
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
875
perror("execv");
876
_exit(EXIT_FAILURE);
877
}
878
} else {
879
if(execve(filename, p->argv, p->environ) < 0){
880
perror("execve");
881
_exit(EXIT_FAILURE);
882
}
1051
883
}
1052
884
/* no return */
1053
885
}
1054
886
/* Parent process */
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1059
if(new_plugin == NULL){
1060
error(0, errno, "getplugin");
1061
ret = (int)(TEMP_FAILURE_RETRY
1062
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1063
NULL)));
887
close(pipefd[1]); /* Close unused write end of pipe */
888
free(filename);
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1064
893
if(ret < 0){
1065
error(0, errno, "sigprocmask");
894
perror("sigprocmask");
1066
895
}
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
896
exitstatus = EXIT_FAILURE;
1069
897
goto fallback;
1070
898
}
1071
free(direntries[i]);
1072
899
1073
900
new_plugin->pid = pid;
1074
901
new_plugin->fd = pipefd[0];
1075
902
1076
903
/* Unblock SIGCHLD so signal handler can be run if this process
1077
904
has already completed */
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask,
1080
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1081
906
if(ret < 0){
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1084
909
goto fallback;
1085
910
}
1086
911
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
912
FD_SET(new_plugin->fd, &rfds_all);
1101
913
1102
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1103
915
maxfd = new_plugin->fd;
1104
916
}
917
1105
918
}
1106
919
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1111
free_plugin(getplugin(NULL));
1112
920
closedir(dir);
921
dir = NULL;
922
1113
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
924
if(p->pid != 0){
1115
925
break;
1120
930
free_plugin_list();
1121
931
}
1122
932
}
1123
933
1124
934
/* Main loop while running plugins exist */
1125
935
while(plugin_list){
1126
936
fd_set rfds = rfds_all;
1127
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1128
if(select_ret == -1 and errno != EINTR){
1129
error(0, errno, "select");
1130
exitstatus = EX_OSERR;
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1131
941
goto fallback;
1132
942
}
1133
943
/* OK, now either a process completed, or something can be read
1134
944
from one of them */
1135
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1136
946
/* Is this process completely done? */
1137
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1138
948
/* Only accept the plugin output if it exited cleanly */
1139
949
if(not WIFEXITED(proc->status)
1140
950
or WEXITSTATUS(proc->status) != 0){
1141
951
/* Bad exit by plugin */
1142
952
1143
953
if(debug){
1144
954
if(WIFEXITED(proc->status)){
1145
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1146
" status %d\n", proc->name,
1147
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1148
957
WEXITSTATUS(proc->status));
1149
} else if(WIFSIGNALED(proc->status)){
1150
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1151
" signal %d: %s\n", proc->name,
1152
(intmax_t) (proc->pid),
1153
WTERMSIG(proc->status),
1154
strsignal(WTERMSIG(proc->status)));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
1155
962
} else if(WCOREDUMP(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1157
" core\n", proc->name, (intmax_t) (proc->pid));
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1158
965
}
1159
966
}
1160
967
1161
968
/* Remove the plugin */
1162
#if defined (__GNUC__) and defined (__GLIBC__)
1163
#if not __GLIBC_PREREQ(2, 16)
1164
#pragma GCC diagnostic push
1165
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
#endif
1167
#endif
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1169
-Wconversion in GNU libc
1170
before 2.16 */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic pop
1174
#endif
1175
#endif
1176
969
FD_CLR(proc->fd, &rfds_all);
970
1177
971
/* Block signal while modifying process_list */
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
973
if(ret < 0){
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1185
976
goto fallback;
1186
977
}
1187
1188
plugin *next_plugin = proc->next;
1189
978
free_plugin(proc);
1190
proc = next_plugin;
1191
1192
979
/* We are done modifying process list, so unblock signal */
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1196
982
if(ret < 0){
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1199
985
goto fallback;
1200
986
}
1201
987
1202
988
if(plugin_list == NULL){
1203
989
break;
1204
990
}
1205
1206
991
continue;
1207
992
}
1208
993
1209
994
/* This process exited nicely, so print its buffer */
1210
995
1211
996
bool bret = print_out_password(proc->buffer,
1212
997
proc->buffer_length);
1213
998
if(not bret){
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1216
1001
}
1217
1002
goto fallback;
1218
1003
}
1219
1004
1220
1005
/* This process has not completed. Does it have any output? */
1221
#if defined (__GNUC__) and defined (__GLIBC__)
1222
#if not __GLIBC_PREREQ(2, 16)
1223
#pragma GCC diagnostic push
1224
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
#endif
1226
#endif
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1228
warning from
1229
-Wconversion
1230
in GNU libc
1231
before
1232
2.16 */
1233
#if defined (__GNUC__) and defined (__GLIBC__)
1234
#if not __GLIBC_PREREQ(2, 16)
1235
#pragma GCC diagnostic pop
1236
#endif
1237
#endif
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1238
1007
/* This process had nothing to say at this time */
1239
proc = proc->next;
1240
1008
continue;
1241
1009
}
1242
1010
/* Before reading, make the process' data buffer large enough */
1243
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1244
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1245
+ (size_t) BUFFER_SIZE);
1246
if(new_buffer == NULL){
1247
error(0, errno, "malloc");
1248
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1249
1017
goto fallback;
1250
1018
}
1251
proc->buffer = new_buffer;
1252
1019
proc->buffer_size += BUFFER_SIZE;
1253
1020
}
1254
1021
/* Read from the process */
1255
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1256
proc->buffer
1257
+ proc->buffer_length,
1258
BUFFER_SIZE));
1259
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1260
1025
/* Read error from this process; ignore the error */
1261
proc = proc->next;
1262
1026
continue;
1263
1027
}
1264
if(sret == 0){
1028
if(ret == 0){
1265
1029
/* got EOF */
1266
1030
proc->eof = true;
1267
1031
} else {
1268
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1269
1033
}
1270
1034
}
1271
1035
}
1272
1273
1036
1037
1274
1038
fallback:
1275
1039
1276
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1277
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1278
1041
/* Fallback if all plugins failed, none are found or an error
1279
1042
occured */
1280
1043
bool bret;
1281
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1282
1045
char *passwordbuffer = getpass("Password: ");
1283
size_t len = strlen(passwordbuffer);
1284
/* Strip trailing newline */
1285
if(len > 0 and passwordbuffer[len-1] == '\n'){
1286
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1287
len--;
1288
}
1289
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1290
1047
if(not bret){
1291
error(0, errno, "print_out_password");
1292
exitstatus = EX_IOERR;
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1293
1050
}
1294
1051
}
1295
1052
1296
1053
/* Restore old signal handler */
1297
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1298
1055
if(ret == -1){
1299
error(0, errno, "sigaction");
1300
exitstatus = EX_OSERR;
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1301
1058
}
1302
1059
1303
1060
if(custom_argv != NULL){
1304
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1305
1062
free(*arg);
1307
1064
free(custom_argv);
1308
1065
}
1309
1066
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1067
if(dir != NULL){
1068
closedir(dir);
1314
1069
}
1315
1070
1316
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1317
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1318
1073
if(p->pid != 0){
1319
1074
close(p->fd);
1320
1075
ret = kill(p->pid, SIGTERM);
1321
1076
if(ret == -1 and errno != ESRCH){
1322
1077
/* Set-uid proccesses might not get closed */
1323
error(0, errno, "kill");
1078
perror("kill");
1324
1079
}
1325
1080
}
1326
1081
}
1327
1082
1328
1083
/* Wait for any remaining child processes to terminate */
1329
do {
1084
do{
1330
1085
ret = wait(NULL);
1331
1086
} while(ret >= 0);
1332
1087
if(errno != ECHILD){
1333
error(0, errno, "wait");
1088
perror("wait");
1334
1089
}
1335
1090
1336
1091
free_plugin_list();
1337
1092
1338
1093
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0