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- Committer: Teddy Hogeborn
- Date: 2009-10-30 16:22:31 UTC
- Revision ID: teddy@fukt.bsnet.se-20091030162231-mpts7eygfkjmr4m5
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugin-runner.c
1
#include <stdio.h> /* popen, fileno */
2
#include <iso646.h> /* and, or, not */
3
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
4
WIFEXITED, WEXITSTATUS, wait */
5
#include <sys/wait.h> /* wait */
6
#include <dirent.h> /* DIR, opendir */
7
#include <sys/stat.h> /* stat, struct stat */
8
#include <unistd.h> /* stat, struct stat, chdir */
9
#include <stdlib.h> /* EXIT_FAILURE */
10
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET, FD_ISSET */
11
#include <string.h> /* strlen, strcpy, strcat */
12
#include <stdbool.h> /* true */
13
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
14
#include <errno.h> /* errno */
15
16
struct process;
17
18
typedef struct process{
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
/*
3
* Mandos plugin runner - Run Mandos plugins
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
17
*
18
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
*/
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
72
73
#define BUFFER_SIZE 256
74
75
#define PDIR "/lib/mandos/plugins.d"
76
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
78
const char *argp_program_version = "plugin-runner " VERSION;
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
80
81
typedef struct plugin{
82
char *name; /* can be NULL or any plugin name */
83
char **argv;
84
int argc;
85
char **environ;
86
int envc;
87
bool disabled;
88
89
/* Variables used for running processes*/
19
90
pid_t pid;
20
91
int fd;
21
92
char *buffer;
22
int buffer_size;
23
int buffer_length;
24
struct process *next;
25
} process;
26
27
#define BUFFER_SIZE 256
93
size_t buffer_size;
94
size_t buffer_length;
95
bool eof;
96
volatile sig_atomic_t completed;
97
int status;
98
struct plugin *next;
99
} plugin;
100
101
static plugin *plugin_list = NULL;
102
103
/* Gets an existing plugin based on name,
104
or if none is found, creates a new one */
105
static plugin *getplugin(char *name){
106
/* Check for existing plugin with that name */
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
if((p->name == name)
109
or (p->name and name and (strcmp(p->name, name) == 0))){
110
return p;
111
}
112
}
113
/* Create a new plugin */
114
plugin *new_plugin = NULL;
115
do {
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
118
if(new_plugin == NULL){
119
return NULL;
120
}
121
char *copy_name = NULL;
122
if(name != NULL){
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
126
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
130
return NULL;
131
}
132
}
133
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
138
139
do {
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
142
if(new_plugin->argv == NULL){
143
int e = errno;
144
free(copy_name);
145
free(new_plugin);
146
errno = e;
147
return NULL;
148
}
149
new_plugin->argv[0] = copy_name;
150
new_plugin->argv[1] = NULL;
151
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
155
if(new_plugin->environ == NULL){
156
int e = errno;
157
free(copy_name);
158
free(new_plugin->argv);
159
free(new_plugin);
160
errno = e;
161
return NULL;
162
}
163
new_plugin->environ[0] = NULL;
164
165
/* Append the new plugin to the list */
166
plugin_list = new_plugin;
167
return new_plugin;
168
}
169
170
/* Helper function for add_argument and add_environment */
171
static bool add_to_char_array(const char *new, char ***array,
172
int *len){
173
/* Resize the pointed-to array to hold one more pointer */
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
178
/* Malloc check */
179
if(*array == NULL){
180
return false;
181
}
182
/* Make a copy of the new string */
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
187
if(copy == NULL){
188
return false;
189
}
190
/* Insert the copy */
191
(*array)[*len] = copy;
192
(*len)++;
193
/* Add a new terminating NULL pointer to the last element */
194
(*array)[*len] = NULL;
195
return true;
196
}
197
198
/* Add to a plugin's argument vector */
199
static bool add_argument(plugin *p, const char *arg){
200
if(p == NULL){
201
return false;
202
}
203
return add_to_char_array(arg, &(p->argv), &(p->argc));
204
}
205
206
/* Add to a plugin's environment */
207
static bool add_environment(plugin *p, const char *def, bool replace){
208
if(p == NULL){
209
return false;
210
}
211
/* namelen = length of name of environment variable */
212
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
216
/* It already exists */
217
if(replace){
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
222
if(new == NULL){
223
return false;
224
}
225
*e = new;
226
strcpy(*e, def);
227
}
228
return true;
229
}
230
}
231
return add_to_char_array(def, &(p->environ), &(p->envc));
232
}
233
234
/*
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
* Descriptor Flags".
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
238
*/
239
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
241
/* If reading the flags failed, return error indication now. */
242
if(ret < 0){
243
return ret;
244
}
245
/* Store modified flag word in the descriptor. */
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
248
}
249
250
251
/* Mark processes as completed when they exit, and save their exit
252
status. */
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
255
while(true){
256
plugin *proc = plugin_list;
257
int status;
258
pid_t pid = waitpid(-1, &status, WNOHANG);
259
if(pid == 0){
260
/* Only still running child processes */
261
break;
262
}
263
if(pid == -1){
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
267
}
268
perror("waitpid");
269
}
270
271
/* A child exited, find it in process_list */
272
while(proc != NULL and proc->pid != pid){
273
proc = proc->next;
274
}
275
if(proc == NULL){
276
/* Process not found in process list */
277
continue;
278
}
279
proc->status = status;
280
proc->completed = 1;
281
}
282
errno = old_errno;
283
}
284
285
/* Prints out a password to stdout */
286
static bool print_out_password(const char *buffer, size_t length){
287
ssize_t ret;
288
for(size_t written = 0; written < length; written += (size_t)ret){
289
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
290
length - written));
291
if(ret < 0){
292
return false;
293
}
294
}
295
return true;
296
}
297
298
/* Removes and free a plugin from the plugin list */
299
static void free_plugin(plugin *plugin_node){
300
301
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
302
free(*arg);
303
}
304
free(plugin_node->argv);
305
for(char **env = plugin_node->environ; *env != NULL; env++){
306
free(*env);
307
}
308
free(plugin_node->environ);
309
free(plugin_node->buffer);
310
311
/* Removes the plugin from the singly-linked list */
312
if(plugin_node == plugin_list){
313
/* First one - simple */
314
plugin_list = plugin_list->next;
315
} else {
316
/* Second one or later */
317
for(plugin *p = plugin_list; p != NULL; p = p->next){
318
if(p->next == plugin_node){
319
p->next = plugin_node->next;
320
break;
321
}
322
}
323
}
324
325
free(plugin_node);
326
}
327
328
static void free_plugin_list(void){
329
while(plugin_list != NULL){
330
free_plugin(plugin_list);
331
}
332
}
28
333
29
334
int main(int argc, char *argv[]){
30
char plugindir[] = "plugins.d";
31
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
32
DIR *dir;
335
char *plugindir = NULL;
336
char *argfile = NULL;
337
FILE *conffp;
338
size_t d_name_len;
339
DIR *dir = NULL;
33
340
struct dirent *dirst;
34
341
struct stat st;
35
fd_set rfds_orig;
342
fd_set rfds_all;
36
343
int ret, maxfd = 0;
37
process *process_list = NULL;
38
39
dir = opendir(plugindir);
40
41
if(dir == NULL){
42
fprintf(stderr, "Can not open directory\n");
43
return EXIT_FAILURE;
44
}
45
46
FD_ZERO(&rfds_orig);
47
344
ssize_t sret;
345
uid_t uid = 65534;
346
gid_t gid = 65534;
347
bool debug = false;
348
int exitstatus = EXIT_SUCCESS;
349
struct sigaction old_sigchld_action;
350
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
351
.sa_flags = SA_NOCLDSTOP };
352
char **custom_argv = NULL;
353
int custom_argc = 0;
354
355
/* Establish a signal handler */
356
sigemptyset(&sigchld_action.sa_mask);
357
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
361
goto fallback;
362
}
363
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
367
goto fallback;
368
}
369
370
/* The options we understand. */
371
struct argp_option options[] = {
372
{ .name = "global-options", .key = 'g',
373
.arg = "OPTION[,OPTION[,...]]",
374
.doc = "Options passed to all plugins" },
375
{ .name = "global-env", .key = 'G',
376
.arg = "VAR=value",
377
.doc = "Environment variable passed to all plugins" },
378
{ .name = "options-for", .key = 'o',
379
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
380
.doc = "Options passed only to specified plugin" },
381
{ .name = "env-for", .key = 'E',
382
.arg = "PLUGIN:ENV=value",
383
.doc = "Environment variable passed to specified plugin" },
384
{ .name = "disable", .key = 'd',
385
.arg = "PLUGIN",
386
.doc = "Disable a specific plugin", .group = 1 },
387
{ .name = "enable", .key = 'e',
388
.arg = "PLUGIN",
389
.doc = "Enable a specific plugin", .group = 1 },
390
{ .name = "plugin-dir", .key = 128,
391
.arg = "DIRECTORY",
392
.doc = "Specify a different plugin directory", .group = 2 },
393
{ .name = "config-file", .key = 129,
394
.arg = "FILE",
395
.doc = "Specify a different configuration file", .group = 2 },
396
{ .name = "userid", .key = 130,
397
.arg = "ID", .flags = 0,
398
.doc = "User ID the plugins will run as", .group = 3 },
399
{ .name = "groupid", .key = 131,
400
.arg = "ID", .flags = 0,
401
.doc = "Group ID the plugins will run as", .group = 3 },
402
{ .name = "debug", .key = 132,
403
.doc = "Debug mode", .group = 4 },
404
/*
405
* These reproduce what we would get without ARGP_NO_HELP
406
*/
407
{ .name = "help", .key = '?',
408
.doc = "Give this help list", .group = -1 },
409
{ .name = "usage", .key = -3,
410
.doc = "Give a short usage message", .group = -1 },
411
{ .name = "version", .key = 'V',
412
.doc = "Print program version", .group = -1 },
413
{ .name = NULL }
414
};
415
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
errno = 0;
418
switch(key){
419
char *tmp;
420
intmax_t tmpmax;
421
case 'g': /* --global-options */
422
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
427
}
428
}
429
}
430
break;
431
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
433
break;
434
case 'o': /* --options-for */
435
{
436
char *option_list = strchr(arg, ':');
437
if(option_list == NULL){
438
argp_error(state, "No colon in \"%s\"", arg);
439
errno = EINVAL;
440
break;
441
}
442
*option_list = '\0';
443
option_list++;
444
if(arg[0] == '\0'){
445
argp_error(state, "Empty plugin name");
446
errno = EINVAL;
447
break;
448
}
449
char *option;
450
while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
452
break;
453
}
454
}
455
}
456
break;
457
case 'E': /* --env-for */
458
{
459
char *envdef = strchr(arg, ':');
460
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*envdef = '\0';
466
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
add_environment(getplugin(arg), envdef, true);
473
}
474
break;
475
case 'd': /* --disable */
476
{
477
plugin *p = getplugin(arg);
478
if(p != NULL){
479
p->disabled = true;
480
}
481
}
482
break;
483
case 'e': /* --enable */
484
{
485
plugin *p = getplugin(arg);
486
if(p != NULL){
487
p->disabled = false;
488
}
489
}
490
break;
491
case 128: /* --plugin-dir */
492
free(plugindir);
493
plugindir = strdup(arg);
494
break;
495
case 129: /* --config-file */
496
/* This is already done by parse_opt_config_file() */
497
break;
498
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
500
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
502
argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
504
break;
505
}
506
uid = (uid_t)tmpmax;
507
break;
508
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
510
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
512
argp_error(state, "Bad group ID number: \"%s\", using %"
513
PRIdMAX, arg, (intmax_t)gid);
514
break;
515
}
516
gid = (gid_t)tmpmax;
517
break;
518
case 132: /* --debug */
519
debug = true;
520
break;
521
/*
522
* These reproduce what we would get without ARGP_NO_HELP
523
*/
524
case '?': /* --help */
525
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
527
case -3: /* --usage */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
532
fprintf(state->out_stream, "%s\n", argp_program_version);
533
exit(EXIT_SUCCESS);
534
break;
535
/*
536
* When adding more options before this line, remember to also add a
537
* "case" to the "parse_opt_config_file" function below.
538
*/
539
case ARGP_KEY_ARG:
540
/* Cryptsetup always passes an argument, which is an empty
541
string if "none" was specified in /etc/crypttab. So if
542
argument was empty, we ignore it silently. */
543
if(arg[0] == '\0'){
544
break;
545
}
546
default:
547
return ARGP_ERR_UNKNOWN;
548
}
549
return errno; /* Set to 0 at start */
550
}
551
552
/* This option parser is the same as parse_opt() above, except it
553
ignores everything but the --config-file option. */
554
error_t parse_opt_config_file(int key, char *arg,
555
__attribute__((unused))
556
struct argp_state *state){
557
errno = 0;
558
switch(key){
559
case 'g': /* --global-options */
560
case 'G': /* --global-env */
561
case 'o': /* --options-for */
562
case 'E': /* --env-for */
563
case 'd': /* --disable */
564
case 'e': /* --enable */
565
case 128: /* --plugin-dir */
566
break;
567
case 129: /* --config-file */
568
free(argfile);
569
argfile = strdup(arg);
570
break;
571
case 130: /* --userid */
572
case 131: /* --groupid */
573
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
577
case ARGP_KEY_ARG:
578
break;
579
default:
580
return ARGP_ERR_UNKNOWN;
581
}
582
return errno;
583
}
584
585
struct argp argp = { .options = options,
586
.parser = parse_opt_config_file,
587
.args_doc = "",
588
.doc = "Mandos plugin runner -- Run plugins" };
589
590
/* Parse using parse_opt_config_file() in order to get the custom
591
config file location, if any. */
592
ret = argp_parse(&argp, argc, argv,
593
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
594
NULL, NULL);
595
switch(ret){
596
case 0:
597
break;
598
case ENOMEM:
599
default:
600
errno = ret;
601
perror("argp_parse");
602
exitstatus = EX_OSERR;
603
goto fallback;
604
case EINVAL:
605
exitstatus = EX_USAGE;
606
goto fallback;
607
}
608
609
/* Reset to the normal argument parser */
610
argp.parser = parse_opt;
611
612
/* Open the configfile if available */
613
if(argfile == NULL){
614
conffp = fopen(AFILE, "r");
615
} else {
616
conffp = fopen(argfile, "r");
617
}
618
if(conffp != NULL){
619
char *org_line = NULL;
620
char *p, *arg, *new_arg, *line;
621
size_t size = 0;
622
const char whitespace_delims[] = " \r\t\f\v\n";
623
const char comment_delim[] = "#";
624
625
custom_argc = 1;
626
custom_argv = malloc(sizeof(char*) * 2);
627
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
630
goto fallback;
631
}
632
custom_argv[0] = argv[0];
633
custom_argv[1] = NULL;
634
635
/* for each line in the config file, strip whitespace and ignore
636
commented text */
637
while(true){
638
sret = getline(&org_line, &size, conffp);
639
if(sret == -1){
640
break;
641
}
642
643
line = org_line;
644
arg = strsep(&line, comment_delim);
645
while((p = strsep(&arg, whitespace_delims)) != NULL){
646
if(p[0] == '\0'){
647
continue;
648
}
649
new_arg = strdup(p);
650
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
653
free(org_line);
654
goto fallback;
655
}
656
657
custom_argc += 1;
658
custom_argv = realloc(custom_argv, sizeof(char *)
659
* ((unsigned int) custom_argc + 1));
660
if(custom_argv == NULL){
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
663
free(org_line);
664
goto fallback;
665
}
666
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
668
}
669
}
670
do {
671
ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
673
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
free(org_line);
679
} else {
680
/* Check for harmful errors and go to fallback. Other errors might
681
not affect opening plugins */
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
685
goto fallback;
686
}
687
}
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
690
if(custom_argv != NULL){
691
ret = argp_parse(&argp, custom_argc, custom_argv,
692
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
693
NULL, NULL);
694
switch(ret){
695
case 0:
696
break;
697
case ENOMEM:
698
default:
699
errno = ret;
700
perror("argp_parse");
701
exitstatus = EX_OSERR;
702
goto fallback;
703
case EINVAL:
704
exitstatus = EX_CONFIG;
705
goto fallback;
706
}
707
}
708
709
/* Parse actual command line arguments, to let them override the
710
config file */
711
ret = argp_parse(&argp, argc, argv,
712
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
713
NULL, NULL);
714
switch(ret){
715
case 0:
716
break;
717
case ENOMEM:
718
default:
719
errno = ret;
720
perror("argp_parse");
721
exitstatus = EX_OSERR;
722
goto fallback;
723
case EINVAL:
724
exitstatus = EX_USAGE;
725
goto fallback;
726
}
727
728
if(debug){
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
730
fprintf(stderr, "Plugin: %s has %d arguments\n",
731
p->name ? p->name : "Global", p->argc - 1);
732
for(char **a = p->argv; *a != NULL; a++){
733
fprintf(stderr, "\tArg: %s\n", *a);
734
}
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
736
for(char **a = p->environ; *a != NULL; a++){
737
fprintf(stderr, "\t%s\n", *a);
738
}
739
}
740
}
741
742
/* Strip permissions down to nobody */
743
setgid(gid);
744
if(ret == -1){
745
perror("setgid");
746
}
747
ret = setuid(uid);
748
if(ret == -1){
749
perror("setuid");
750
}
751
752
/* Open plugin directory with close_on_exec flag */
753
{
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
772
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
775
goto fallback;
776
}
777
778
#ifndef O_CLOEXEC
779
/* Set the FD_CLOEXEC flag on the directory */
780
ret = set_cloexec_flag(dir_fd);
781
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
785
goto fallback;
786
}
787
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
795
}
796
}
797
798
FD_ZERO(&rfds_all);
799
800
/* Read and execute any executable in the plugin directory*/
48
801
while(true){
49
dirst = readdir(dir);
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
50
805
51
// All directory entries have been processed
806
/* All directory entries have been processed */
52
807
if(dirst == NULL){
808
if(errno == EBADF){
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
811
goto fallback;
812
}
53
813
break;
54
814
}
55
815
56
816
d_name_len = strlen(dirst->d_name);
57
817
58
// Ignore dotfiles and backup files
59
if (dirst->d_name[0] == '.'
60
or dirst->d_name[d_name_len - 1] == '~'){
61
continue;
62
}
63
64
char *filename = malloc(d_name_len + plugindir_len + 1);
65
strcpy(filename, plugindir);
66
strcat(filename, "/");
67
strcat(filename, dirst->d_name);
68
69
stat(filename, &st);
70
71
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
72
// Starting a new process to be watched
73
process *new_process = malloc(sizeof(process));
74
int pipefd[2];
75
pipe(pipefd);
76
new_process->pid = fork();
77
if(new_process->pid == 0){
78
/* this is the child process */
818
/* Ignore dotfiles, backup files and other junk */
819
{
820
bool bad_name = false;
821
822
const char const *bad_prefixes[] = { ".", "#", NULL };
823
824
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
".dpkg-old",
826
".dpkg-bak",
827
".dpkg-divert", NULL };
828
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
size_t pre_len = strlen(*pre);
830
if((d_name_len >= pre_len)
831
and strncmp((dirst->d_name), *pre, pre_len) == 0){
832
if(debug){
833
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
834
" with bad prefix %s\n", dirst->d_name, *pre);
835
}
836
bad_name = true;
837
break;
838
}
839
}
840
if(bad_name){
841
continue;
842
}
843
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
844
size_t suf_len = strlen(*suf);
845
if((d_name_len >= suf_len)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
847
== 0)){
848
if(debug){
849
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
850
" with bad suffix %s\n", dirst->d_name, *suf);
851
}
852
bad_name = true;
853
break;
854
}
855
}
856
857
if(bad_name){
858
continue;
859
}
860
}
861
862
char *filename;
863
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
866
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
870
}
871
if(ret < 0){
872
perror("asprintf");
873
continue;
874
}
875
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
878
perror("stat");
879
free(filename);
880
continue;
881
}
882
883
/* Ignore non-executable files */
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
886
if(debug){
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
" with bad type or mode\n", filename);
889
}
890
free(filename);
891
continue;
892
}
893
894
plugin *p = getplugin(dirst->d_name);
895
if(p == NULL){
896
perror("getplugin");
897
free(filename);
898
continue;
899
}
900
if(p->disabled){
901
if(debug){
902
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
903
dirst->d_name);
904
}
905
free(filename);
906
continue;
907
}
908
{
909
/* Add global arguments to argument list for this plugin */
910
plugin *g = getplugin(NULL);
911
if(g != NULL){
912
for(char **a = g->argv + 1; *a != NULL; a++){
913
if(not add_argument(p, *a)){
914
perror("add_argument");
915
}
916
}
917
/* Add global environment variables */
918
for(char **e = g->environ; *e != NULL; e++){
919
if(not add_environment(p, *e, false)){
920
perror("add_environment");
921
}
922
}
923
}
924
}
925
/* If this plugin has any environment variables, we will call
926
using execve and need to duplicate the environment from this
927
process, too. */
928
if(p->environ[0] != NULL){
929
for(char **e = environ; *e != NULL; e++){
930
if(not add_environment(p, *e, false)){
931
perror("add_environment");
932
}
933
}
934
}
935
936
int pipefd[2];
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
941
goto fallback;
942
}
943
/* Ask OS to automatic close the pipe on exec */
944
ret = set_cloexec_flag(pipefd[0]);
945
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
948
goto fallback;
949
}
950
ret = set_cloexec_flag(pipefd[1]);
951
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
954
goto fallback;
955
}
956
/* Block SIGCHLD until process is safely in process list */
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
960
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
963
goto fallback;
964
}
965
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
970
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
973
goto fallback;
974
}
975
if(pid == 0){
976
/* this is the child process */
977
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
981
}
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
986
}
987
988
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
992
}
993
994
if(dirfd(dir) < 0){
995
/* If dir has no file descriptor, we could not set FD_CLOEXEC
996
above and must now close it manually here. */
79
997
closedir(dir);
80
close(pipefd[0]); /* close unused read end of pipe */
81
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
82
/* create a new modified argument list */
83
char **new_argv = malloc(sizeof(char *) * argc + 1);
84
new_argv[0] = filename;
85
for(int i = 1; i < argc; i++){
86
new_argv[i] = argv[i];
87
}
88
new_argv[argc] = NULL;
89
if(execv(filename, new_argv) < 0){
90
perror(argv[0]);
91
close(pipefd[1]);
92
exit(EXIT_FAILURE);
93
}
94
/* no return */
95
}
96
close(pipefd[1]); /* close unused write end of pipe */
97
new_process->fd = pipefd[0];
98
new_process->buffer = malloc(BUFFER_SIZE);
99
if (new_process->buffer == NULL){
100
perror(argv[0]);
101
goto end;
102
}
103
new_process->buffer_size = BUFFER_SIZE;
104
new_process->buffer_length = 0;
105
FD_SET(new_process->fd, &rfds_orig);
106
107
if (maxfd < new_process->fd){
108
maxfd = new_process->fd;
109
}
110
111
//List handling
112
new_process->next = process_list;
113
process_list = new_process;
114
}
115
}
116
117
closedir(dir);
118
119
if (process_list != NULL){
120
while(true){
121
fd_set rfds = rfds_orig;
122
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
123
if (select_ret == -1){
124
perror(argv[0]);
125
goto end;
126
}else{
127
for(process *process_itr = process_list; process_itr != NULL;
128
process_itr = process_itr->next){
129
if(FD_ISSET(process_itr->fd, &rfds)){
130
if(process_itr->buffer_length + BUFFER_SIZE
131
> process_itr->buffer_size){
132
process_itr->buffer = realloc(process_itr->buffer,
133
process_itr->buffer_size
134
+ BUFFER_SIZE);
135
if (process_itr->buffer == NULL){
136
perror(argv[0]);
137
goto end;
138
}
139
process_itr->buffer_size += BUFFER_SIZE;
140
}
141
ret = read(process_itr->fd, process_itr->buffer
142
+ process_itr->buffer_length, BUFFER_SIZE);
143
process_itr->buffer_length+=ret;
144
if(ret == 0){
145
/* got EOF */
146
/* wait for process exit */
147
int status;
148
waitpid(process_itr->pid, &status, 0);
149
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
150
write(STDOUT_FILENO, process_itr->buffer,
151
process_itr->buffer_length);
152
goto end;
153
} else {
154
FD_CLR(process_itr->fd, &rfds_orig);
155
}
156
}
157
}
158
}
159
}
160
}
161
}
162
163
end:
164
for(process *process_itr = process_list; process_itr != NULL;
165
process_itr = process_itr->next){
166
close(process_itr->fd);
167
kill(process_itr->pid, SIGTERM);
168
free(process_itr->buffer);
169
}
170
171
while(true){
172
int status;
173
ret = wait(&status);
174
if (ret == -1){
175
if(errno != ECHILD){
176
perror("wait");
177
}
998
}
999
if(p->environ[0] == NULL){
1000
if(execv(filename, p->argv) < 0){
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1003
}
1004
} else {
1005
if(execve(filename, p->argv, p->environ) < 0){
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1008
}
1009
}
1010
/* no return */
1011
}
1012
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
1015
free(filename);
1016
plugin *new_plugin = getplugin(dirst->d_name);
1017
if(new_plugin == NULL){
1018
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
1022
if(ret < 0){
1023
perror("sigprocmask");
1024
}
1025
exitstatus = EXIT_FAILURE;
1026
goto fallback;
1027
}
1028
1029
new_plugin->pid = pid;
1030
new_plugin->fd = pipefd[0];
1031
1032
/* Unblock SIGCHLD so signal handler can be run if this process
1033
has already completed */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
1037
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1040
goto fallback;
1041
}
1042
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
1045
1046
if(maxfd < new_plugin->fd){
1047
maxfd = new_plugin->fd;
1048
}
1049
}
1050
1051
TEMP_FAILURE_RETRY(closedir(dir));
1052
dir = NULL;
1053
free_plugin(getplugin(NULL));
1054
1055
for(plugin *p = plugin_list; p != NULL; p = p->next){
1056
if(p->pid != 0){
178
1057
break;
179
1058
}
180
}
181
return EXIT_SUCCESS;
1059
if(p->next == NULL){
1060
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1061
" directory?\n");
1062
free_plugin_list();
1063
}
1064
}
1065
1066
/* Main loop while running plugins exist */
1067
while(plugin_list){
1068
fd_set rfds = rfds_all;
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1073
goto fallback;
1074
}
1075
/* OK, now either a process completed, or something can be read
1076
from one of them */
1077
for(plugin *proc = plugin_list; proc != NULL;){
1078
/* Is this process completely done? */
1079
if(proc->completed and proc->eof){
1080
/* Only accept the plugin output if it exited cleanly */
1081
if(not WIFEXITED(proc->status)
1082
or WEXITSTATUS(proc->status) != 0){
1083
/* Bad exit by plugin */
1084
1085
if(debug){
1086
if(WIFEXITED(proc->status)){
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
1090
WEXITSTATUS(proc->status));
1091
} else if(WIFSIGNALED(proc->status)){
1092
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
1094
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
1097
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
1100
}
1101
}
1102
1103
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
1107
/* Block signal while modifying process_list */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
1112
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1115
goto fallback;
1116
}
1117
1118
plugin *next_plugin = proc->next;
1119
free_plugin(proc);
1120
proc = next_plugin;
1121
1122
/* We are done modifying process list, so unblock signal */
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
1126
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1129
goto fallback;
1130
}
1131
1132
if(plugin_list == NULL){
1133
break;
1134
}
1135
1136
continue;
1137
}
1138
1139
/* This process exited nicely, so print its buffer */
1140
1141
bool bret = print_out_password(proc->buffer,
1142
proc->buffer_length);
1143
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1146
}
1147
goto fallback;
1148
}
1149
1150
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1154
/* This process had nothing to say at this time */
1155
proc = proc->next;
1156
continue;
1157
}
1158
/* Before reading, make the process' data buffer large enough */
1159
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1165
goto fallback;
1166
}
1167
proc->buffer_size += BUFFER_SIZE;
1168
}
1169
/* Read from the process */
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1174
if(sret < 0){
1175
/* Read error from this process; ignore the error */
1176
proc = proc->next;
1177
continue;
1178
}
1179
if(sret == 0){
1180
/* got EOF */
1181
proc->eof = true;
1182
} else {
1183
proc->buffer_length += (size_t) sret;
1184
}
1185
}
1186
}
1187
1188
1189
fallback:
1190
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
/* Fallback if all plugins failed, none are found or an error
1193
occured */
1194
bool bret;
1195
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1196
char *passwordbuffer = getpass("Password: ");
1197
size_t len = strlen(passwordbuffer);
1198
/* Strip trailing newline */
1199
if(len > 0 and passwordbuffer[len-1] == '\n'){
1200
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1201
len--;
1202
}
1203
bret = print_out_password(passwordbuffer, len);
1204
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1207
}
1208
}
1209
1210
/* Restore old signal handler */
1211
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1215
}
1216
1217
if(custom_argv != NULL){
1218
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1219
free(*arg);
1220
}
1221
free(custom_argv);
1222
}
1223
1224
if(dir != NULL){
1225
closedir(dir);
1226
}
1227
1228
/* Kill the processes */
1229
for(plugin *p = plugin_list; p != NULL; p = p->next){
1230
if(p->pid != 0){
1231
close(p->fd);
1232
ret = kill(p->pid, SIGTERM);
1233
if(ret == -1 and errno != ESRCH){
1234
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1236
}
1237
}
1238
}
1239
1240
/* Wait for any remaining child processes to terminate */
1241
do {
1242
ret = wait(NULL);
1243
} while(ret >= 0);
1244
if(errno != ECHILD){
1245
perror("wait");
1246
}
1247
1248
free_plugin_list();
1249
1250
free(plugindir);
1251
free(argfile);
1252
1253
return exitstatus;
182
1254
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0