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- Committer: Teddy Hogeborn
- Date: 2009-10-26 21:16:16 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20091026211616-38e9wynf4428ip2l
Merge from release branch.
- files added:
- NEWS
- debian/po
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
66
72
67
73
#define BUFFER_SIZE 256
68
74
69
75
#define PDIR "/lib/mandos/plugins.d"
70
76
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
77
72
const char *argp_program_version = "plugin-runner 1.0";
78
const char *argp_program_version = "plugin-runner " VERSION;
73
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
80
75
struct plugin;
76
77
81
typedef struct plugin{
78
82
char *name; /* can be NULL or any plugin name */
79
83
char **argv;
81
85
char **environ;
82
86
int envc;
83
87
bool disabled;
84
88
85
89
/* Variables used for running processes*/
86
90
pid_t pid;
87
91
int fd;
89
93
size_t buffer_size;
90
94
size_t buffer_length;
91
95
bool eof;
92
volatile bool completed;
93
volatile int status;
96
volatile sig_atomic_t completed;
97
int status;
94
98
struct plugin *next;
95
99
} plugin;
96
100
99
103
/* Gets an existing plugin based on name,
100
104
or if none is found, creates a new one */
101
105
static plugin *getplugin(char *name){
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))){
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))){
106
110
return p;
107
111
}
108
112
}
109
113
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
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){
112
119
return NULL;
113
120
}
114
121
char *copy_name = NULL;
115
122
if(name != NULL){
116
copy_name = strdup(name);
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
117
126
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
118
130
return NULL;
119
131
}
120
132
}
121
133
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
126
138
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
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;
129
144
free(copy_name);
130
145
free(new_plugin);
146
errno = e;
131
147
return NULL;
132
148
}
133
149
new_plugin->argv[0] = copy_name;
134
150
new_plugin->argv[1] = NULL;
135
151
136
new_plugin->environ = malloc(sizeof(char *));
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
137
155
if(new_plugin->environ == NULL){
156
int e = errno;
138
157
free(copy_name);
139
158
free(new_plugin->argv);
140
159
free(new_plugin);
160
errno = e;
141
161
return NULL;
142
162
}
143
163
new_plugin->environ[0] = NULL;
151
171
static bool add_to_char_array(const char *new, char ***array,
152
172
int *len){
153
173
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
156
178
/* Malloc check */
157
179
if(*array == NULL){
158
180
return false;
159
181
}
160
182
/* Make a copy of the new string */
161
char *copy = strdup(new);
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
162
187
if(copy == NULL){
163
188
return false;
164
189
}
190
215
if(strncmp(*e, def, namelen + 1) == 0){
191
216
/* It already exists */
192
217
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
194
222
if(new == NULL){
195
223
return false;
196
224
}
206
234
/*
207
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
236
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
238
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
239
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
241
/* If reading the flags failed, return error indication now. */
215
242
if(ret < 0){
216
243
return ret;
217
244
}
218
245
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
220
248
}
221
249
222
250
223
251
/* Mark processes as completed when they exit, and save their exit
224
252
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
226
255
while(true){
227
256
plugin *proc = plugin_list;
228
257
int status;
232
261
break;
233
262
}
234
263
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
237
267
}
238
/* No child processes */
239
break;
268
perror("waitpid");
240
269
}
241
270
242
271
/* A child exited, find it in process_list */
248
277
continue;
249
278
}
250
279
proc->status = status;
251
proc->completed = true;
280
proc->completed = 1;
252
281
}
282
errno = old_errno;
253
283
}
254
284
255
285
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
286
static bool print_out_password(const char *buffer, size_t length){
257
287
ssize_t ret;
258
288
for(size_t written = 0; written < length; written += (size_t)ret){
259
289
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
277
307
}
278
308
free(plugin_node->environ);
279
309
free(plugin_node->buffer);
280
310
281
311
/* Removes the plugin from the singly-linked list */
282
312
if(plugin_node == plugin_list){
283
313
/* First one - simple */
311
341
struct stat st;
312
342
fd_set rfds_all;
313
343
int ret, maxfd = 0;
344
ssize_t sret;
314
345
uid_t uid = 65534;
315
346
gid_t gid = 65534;
316
347
bool debug = false;
370
401
.doc = "Group ID the plugins will run as", .group = 3 },
371
402
{ .name = "debug", .key = 132,
372
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 },
373
413
{ .name = NULL }
374
414
};
375
415
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
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;
379
421
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
422
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
389
427
}
390
428
}
391
429
}
392
430
break;
393
431
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
432
add_environment(getplugin(NULL), arg, true);
400
433
break;
401
434
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
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;
419
453
}
420
454
}
421
455
}
422
456
break;
423
457
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
458
{
428
459
char *envdef = strchr(arg, ':');
429
460
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
430
463
break;
431
464
}
432
465
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
466
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
435
471
}
472
add_environment(getplugin(arg), envdef, true);
436
473
}
437
474
break;
438
475
case 'd': /* --disable */
439
if (arg != NULL){
476
{
440
477
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
478
if(p != NULL){
479
p->disabled = true;
443
480
}
444
p->disabled = true;
445
481
}
446
482
break;
447
483
case 'e': /* --enable */
448
if (arg != NULL){
484
{
449
485
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
486
if(p != NULL){
487
p->disabled = false;
452
488
}
453
p->disabled = false;
454
489
}
455
490
break;
456
491
case 128: /* --plugin-dir */
457
492
free(plugindir);
458
493
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
462
494
break;
463
495
case 129: /* --config-file */
464
496
/* This is already done by parse_opt_config_file() */
465
497
break;
466
498
case 130: /* --userid */
467
uid = (uid_t)strtol(arg, NULL, 10);
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;
468
507
break;
469
508
case 131: /* --groupid */
470
gid = (gid_t)strtol(arg, NULL, 10);
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;
471
517
break;
472
518
case 132: /* --debug */
473
519
debug = true;
474
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
*/
475
539
case ARGP_KEY_ARG:
476
540
/* Cryptsetup always passes an argument, which is an empty
477
541
string if "none" was specified in /etc/crypttab. So if
478
542
argument was empty, we ignore it silently. */
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
543
if(arg[0] == '\0'){
544
break;
481
545
}
482
break;
483
case ARGP_KEY_END:
484
break;
485
546
default:
486
547
return ARGP_ERR_UNKNOWN;
487
548
}
488
return 0;
549
return errno; /* Set to 0 at start */
489
550
}
490
551
491
552
/* This option parser is the same as parse_opt() above, except it
492
553
ignores everything but the --config-file option. */
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
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){
497
559
case 'g': /* --global-options */
498
560
case 'G': /* --global-env */
499
561
case 'o': /* --options-for */
505
567
case 129: /* --config-file */
506
568
free(argfile);
507
569
argfile = strdup(arg);
508
if(argfile == NULL){
509
perror("strdup");
510
}
511
break;
570
break;
512
571
case 130: /* --userid */
513
572
case 131: /* --groupid */
514
573
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
515
577
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
517
578
break;
518
579
default:
519
580
return ARGP_ERR_UNKNOWN;
520
581
}
521
return 0;
582
return errno;
522
583
}
523
584
524
585
struct argp argp = { .options = options,
526
587
.args_doc = "",
527
588
.doc = "Mandos plugin runner -- Run plugins" };
528
589
529
/* Parse using the parse_opt_config_file in order to get the custom
590
/* Parse using parse_opt_config_file() in order to get the custom
530
591
config file location, if any. */
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
532
if (ret == ARGP_ERR_UNKNOWN){
533
fprintf(stderr, "Unknown error while parsing arguments\n");
534
exitstatus = EXIT_FAILURE;
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;
535
606
goto fallback;
536
607
}
537
608
539
610
argp.parser = parse_opt;
540
611
541
612
/* Open the configfile if available */
542
if (argfile == NULL){
613
if(argfile == NULL){
543
614
conffp = fopen(AFILE, "r");
544
615
} else {
545
616
conffp = fopen(argfile, "r");
546
}
617
}
547
618
if(conffp != NULL){
548
619
char *org_line = NULL;
549
620
char *p, *arg, *new_arg, *line;
550
621
size_t size = 0;
551
ssize_t sret;
552
622
const char whitespace_delims[] = " \r\t\f\v\n";
553
623
const char comment_delim[] = "#";
554
624
555
625
custom_argc = 1;
556
626
custom_argv = malloc(sizeof(char*) * 2);
557
627
if(custom_argv == NULL){
561
631
}
562
632
custom_argv[0] = argv[0];
563
633
custom_argv[1] = NULL;
564
634
565
635
/* for each line in the config file, strip whitespace and ignore
566
636
commented text */
567
637
while(true){
569
639
if(sret == -1){
570
640
break;
571
641
}
572
642
573
643
line = org_line;
574
644
arg = strsep(&line, comment_delim);
575
645
while((p = strsep(&arg, whitespace_delims)) != NULL){
594
664
goto fallback;
595
665
}
596
666
custom_argv[custom_argc-1] = new_arg;
597
custom_argv[custom_argc] = NULL;
667
custom_argv[custom_argc] = NULL;
598
668
}
599
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
}
600
678
free(org_line);
601
679
} else {
602
680
/* Check for harmful errors and go to fallback. Other errors might
603
681
not affect opening plugins */
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
683
perror("fopen");
606
684
exitstatus = EXIT_FAILURE;
607
685
goto fallback;
608
686
}
609
687
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
612
690
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
615
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
617
exitstatus = EXIT_FAILURE;
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;
618
705
goto fallback;
619
706
}
620
707
}
621
708
622
709
/* Parse actual command line arguments, to let them override the
623
710
config file */
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
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;
628
725
goto fallback;
629
726
}
630
727
635
732
for(char **a = p->argv; *a != NULL; a++){
636
733
fprintf(stderr, "\tArg: %s\n", *a);
637
734
}
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
639
736
for(char **a = p->environ; *a != NULL; a++){
640
737
fprintf(stderr, "\t%s\n", *a);
641
738
}
643
740
}
644
741
645
742
/* Strip permissions down to nobody */
743
setgid(gid);
744
if(ret == -1){
745
perror("setgid");
746
}
646
747
ret = setuid(uid);
647
if (ret == -1){
748
if(ret == -1){
648
749
perror("setuid");
649
}
650
setgid(gid);
651
if (ret == -1){
652
perror("setgid");
653
}
654
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
661
if(dir == NULL){
662
perror("Could not open plugin dir");
663
exitstatus = EXIT_FAILURE;
664
goto fallback;
665
}
666
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
750
}
751
752
/* Open plugin directory with close_on_exec flag */
668
753
{
669
int dir_fd = dirfd(dir);
670
if(dir_fd >= 0){
671
ret = set_cloexec_flag(dir_fd);
672
if(ret < 0){
673
perror("set_cloexec_flag");
674
exitstatus = EXIT_FAILURE;
675
goto fallback;
676
}
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;
677
795
}
678
796
}
679
797
681
799
682
800
/* Read and execute any executable in the plugin directory*/
683
801
while(true){
684
dirst = readdir(dir);
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
685
805
686
806
/* All directory entries have been processed */
687
807
if(dirst == NULL){
688
if (errno == EBADF){
808
if(errno == EBADF){
689
809
perror("readdir");
690
810
exitstatus = EXIT_FAILURE;
691
811
goto fallback;
703
823
704
824
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
705
825
".dpkg-old",
826
".dpkg-bak",
706
827
".dpkg-divert", NULL };
707
828
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
708
829
size_t pre_len = strlen(*pre);
737
858
continue;
738
859
}
739
860
}
740
861
741
862
char *filename;
742
863
if(plugindir == NULL){
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
744
866
} else {
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
746
870
}
747
871
if(ret < 0){
748
872
perror("asprintf");
749
873
continue;
750
874
}
751
875
752
ret = stat(filename, &st);
753
if (ret == -1){
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
754
878
perror("stat");
755
879
free(filename);
756
880
continue;
757
881
}
758
882
759
883
/* Ignore non-executable files */
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
761
886
if(debug){
762
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
763
888
" with bad type or mode\n", filename);
809
934
}
810
935
811
936
int pipefd[2];
812
ret = pipe(pipefd);
813
if (ret == -1){
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
814
939
perror("pipe");
815
940
exitstatus = EXIT_FAILURE;
816
941
goto fallback;
829
954
goto fallback;
830
955
}
831
956
/* Block SIGCHLD until process is safely in process list */
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
833
960
if(ret < 0){
834
961
perror("sigprocmask");
835
962
exitstatus = EXIT_FAILURE;
836
963
goto fallback;
837
964
}
838
965
/* Starting a new process to be watched */
839
pid_t pid = fork();
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
840
970
if(pid == -1){
841
971
perror("fork");
842
972
exitstatus = EXIT_FAILURE;
849
979
perror("sigaction");
850
980
_exit(EXIT_FAILURE);
851
981
}
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
853
983
if(ret < 0){
854
984
perror("sigprocmask");
855
985
_exit(EXIT_FAILURE);
856
986
}
857
987
858
988
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
859
989
if(ret == -1){
860
990
perror("dup2");
880
1010
/* no return */
881
1011
}
882
1012
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
884
1015
free(filename);
885
1016
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
1017
if(new_plugin == NULL){
887
1018
perror("getplugin");
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
889
1022
if(ret < 0){
890
1023
perror("sigprocmask");
891
1024
}
898
1031
899
1032
/* Unblock SIGCHLD so signal handler can be run if this process
900
1033
has already completed */
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
902
1037
if(ret < 0){
903
1038
perror("sigprocmask");
904
1039
exitstatus = EXIT_FAILURE;
905
1040
goto fallback;
906
1041
}
907
1042
908
FD_SET(new_plugin->fd, &rfds_all);
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
909
1045
910
if (maxfd < new_plugin->fd){
1046
if(maxfd < new_plugin->fd){
911
1047
maxfd = new_plugin->fd;
912
1048
}
913
914
1049
}
915
1050
916
closedir(dir);
1051
TEMP_FAILURE_RETRY(closedir(dir));
917
1052
dir = NULL;
918
1053
free_plugin(getplugin(NULL));
1054
919
1055
for(plugin *p = plugin_list; p != NULL; p = p->next){
920
1056
if(p->pid != 0){
921
1057
break;
926
1062
free_plugin_list();
927
1063
}
928
1064
}
929
1065
930
1066
/* Main loop while running plugins exist */
931
1067
while(plugin_list){
932
1068
fd_set rfds = rfds_all;
933
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
if (select_ret == -1){
1070
if(select_ret == -1 and errno != EINTR){
935
1071
perror("select");
936
1072
exitstatus = EXIT_FAILURE;
937
1073
goto fallback;
940
1076
from one of them */
941
1077
for(plugin *proc = plugin_list; proc != NULL;){
942
1078
/* Is this process completely done? */
943
if(proc->eof and proc->completed){
1079
if(proc->completed and proc->eof){
944
1080
/* Only accept the plugin output if it exited cleanly */
945
1081
if(not WIFEXITED(proc->status)
946
1082
or WEXITSTATUS(proc->status) != 0){
947
1083
/* Bad exit by plugin */
948
1084
949
1085
if(debug){
950
1086
if(WIFEXITED(proc->status)){
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
953
1090
WEXITSTATUS(proc->status));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(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)));
958
1097
} else if(WCOREDUMP(proc->status)){
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
961
1100
}
962
1101
}
963
1102
964
1103
/* Remove the plugin */
965
FD_CLR(proc->fd, &rfds_all);
966
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
967
1107
/* Block signal while modifying process_list */
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
978
if(ret < 0){
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
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;
986
1116
}
987
1117
988
1118
plugin *next_plugin = proc->next;
989
1119
free_plugin(proc);
990
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
991
1136
continue;
992
1137
}
993
1138
994
1139
/* This process exited nicely, so print its buffer */
995
1140
996
1141
bool bret = print_out_password(proc->buffer,
997
1142
proc->buffer_length);
998
1143
if(not bret){
1003
1148
}
1004
1149
1005
1150
/* This process has not completed. Does it have any output? */
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1007
1154
/* This process had nothing to say at this time */
1008
1155
proc = proc->next;
1009
1156
continue;
1012
1159
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1013
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1014
1161
+ (size_t) BUFFER_SIZE);
1015
if (proc->buffer == NULL){
1162
if(proc->buffer == NULL){
1016
1163
perror("malloc");
1017
1164
exitstatus = EXIT_FAILURE;
1018
1165
goto fallback;
1020
1167
proc->buffer_size += BUFFER_SIZE;
1021
1168
}
1022
1169
/* Read from the process */
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1174
if(sret < 0){
1026
1175
/* Read error from this process; ignore the error */
1027
1176
proc = proc->next;
1028
1177
continue;
1029
1178
}
1030
if(ret == 0){
1179
if(sret == 0){
1031
1180
/* got EOF */
1032
1181
proc->eof = true;
1033
1182
} else {
1034
proc->buffer_length += (size_t) ret;
1183
proc->buffer_length += (size_t) sret;
1035
1184
}
1036
1185
}
1037
1186
}
1038
1039
1187
1188
1040
1189
fallback:
1041
1190
1042
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1064
1213
perror("sigaction");
1065
1214
exitstatus = EXIT_FAILURE;
1066
1215
}
1067
1216
1068
1217
if(custom_argv != NULL){
1069
1218
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1070
1219
free(*arg);
1076
1225
closedir(dir);
1077
1226
}
1078
1227
1079
/* Free the process list and kill the processes */
1228
/* Kill the processes */
1080
1229
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
1230
if(p->pid != 0){
1082
1231
close(p->fd);
1089
1238
}
1090
1239
1091
1240
/* Wait for any remaining child processes to terminate */
1092
do{
1241
do {
1093
1242
ret = wait(NULL);
1094
1243
} while(ret >= 0);
1095
1244
if(errno != ECHILD){
1096
1245
perror("wait");
1097
1246
}
1098
1247
1099
1248
free_plugin_list();
1100
1249
1101
1250
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0