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- Committer: Teddy Hogeborn
- Date: 2010-09-12 03:22:48 UTC
- Revision ID: teddy@fukt.bsnet.se-20100912032248-6cizkymqivr5uzwm
* Makefile (run-server): Remove warning about now-eliminated error.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
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> /* 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(), strcmp(), strncmp() */
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, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
const char *argp_program_version = "plugin-runner 1.0";
81
const char *argp_program_version = "plugin-runner " VERSION;
73
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
83
75
struct plugin;
76
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
79
86
char **argv;
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
101
108
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))){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
106
113
return p;
107
114
}
108
115
}
109
116
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
112
122
return NULL;
113
123
}
114
124
char *copy_name = NULL;
115
125
if(name != NULL){
116
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
118
133
return NULL;
119
134
}
120
135
}
121
136
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
126
141
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
129
147
free(copy_name);
130
148
free(new_plugin);
149
errno = e;
131
150
return NULL;
132
151
}
133
152
new_plugin->argv[0] = copy_name;
134
153
new_plugin->argv[1] = NULL;
135
154
136
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
137
158
if(new_plugin->environ == NULL){
159
int e = errno;
138
160
free(copy_name);
139
161
free(new_plugin->argv);
140
162
free(new_plugin);
163
errno = e;
141
164
return NULL;
142
165
}
143
166
new_plugin->environ[0] = NULL;
151
174
static bool add_to_char_array(const char *new, char ***array,
152
175
int *len){
153
176
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
156
181
/* Malloc check */
157
182
if(*array == NULL){
158
183
return false;
159
184
}
160
185
/* Make a copy of the new string */
161
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
162
190
if(copy == NULL){
163
191
return false;
164
192
}
190
218
if(strncmp(*e, def, namelen + 1) == 0){
191
219
/* It already exists */
192
220
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
194
225
if(new == NULL){
195
226
return false;
196
227
}
206
237
/*
207
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
239
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
241
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
244
/* If reading the flags failed, return error indication now. */
215
245
if(ret < 0){
216
246
return ret;
217
247
}
218
248
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
220
251
}
221
252
222
253
223
254
/* Mark processes as completed when they exit, and save their exit
224
255
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
226
258
while(true){
227
259
plugin *proc = plugin_list;
228
260
int status;
232
264
break;
233
265
}
234
266
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
237
270
}
238
/* No child processes */
239
break;
271
error(0, errno, "waitpid");
240
272
}
241
273
242
274
/* A child exited, find it in process_list */
248
280
continue;
249
281
}
250
282
proc->status = status;
251
proc->completed = true;
283
proc->completed = 1;
252
284
}
285
errno = old_errno;
253
286
}
254
287
255
288
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
289
static bool print_out_password(const char *buffer, size_t length){
257
290
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
291
for(size_t written = 0; written < length; written += (size_t)ret){
262
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
293
length - written));
280
310
}
281
311
free(plugin_node->environ);
282
312
free(plugin_node->buffer);
283
313
284
314
/* Removes the plugin from the singly-linked list */
285
315
if(plugin_node == plugin_list){
286
316
/* First one - simple */
314
344
struct stat st;
315
345
fd_set rfds_all;
316
346
int ret, maxfd = 0;
347
ssize_t sret;
317
348
uid_t uid = 65534;
318
349
gid_t gid = 65534;
319
350
bool debug = false;
328
359
sigemptyset(&sigchld_action.sa_mask);
329
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
361
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
333
364
goto fallback;
334
365
}
335
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
367
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
339
370
goto fallback;
340
371
}
341
372
373
404
.doc = "Group ID the plugins will run as", .group = 3 },
374
405
{ .name = "debug", .key = 132,
375
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
376
416
{ .name = NULL }
377
417
};
378
418
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
382
424
case 'g': /* --global-options */
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;
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
392
430
}
393
431
}
394
432
}
395
433
break;
396
434
case 'G': /* --global-env */
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
}
408
}
435
add_environment(getplugin(NULL), arg, true);
409
436
break;
410
437
case 'o': /* --options-for */
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
418
break;
419
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
428
456
}
429
457
}
430
458
}
431
459
break;
432
460
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
436
461
{
437
462
char *envdef = strchr(arg, ':');
438
463
if(envdef == NULL){
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
445
469
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
448
474
}
475
add_environment(getplugin(arg), envdef, true);
449
476
}
450
477
break;
451
478
case 'd': /* --disable */
452
if (arg != NULL){
479
{
453
480
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
456
483
}
457
p->disabled = true;
458
484
}
459
485
break;
460
486
case 'e': /* --enable */
461
if (arg != NULL){
487
{
462
488
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
465
491
}
466
p->disabled = false;
467
492
}
468
493
break;
469
494
case 128: /* --plugin-dir */
495
free(plugindir);
470
496
plugindir = strdup(arg);
471
if(plugindir == NULL){
472
perror("strdup");
473
}
474
497
break;
475
498
case 129: /* --config-file */
476
499
/* This is already done by parse_opt_config_file() */
477
500
break;
478
501
case 130: /* --userid */
479
uid = (uid_t)strtol(arg, NULL, 10);
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
480
510
break;
481
511
case 131: /* --groupid */
482
gid = (gid_t)strtol(arg, NULL, 10);
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
483
520
break;
484
521
case 132: /* --debug */
485
522
debug = true;
486
523
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
487
542
case ARGP_KEY_ARG:
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
548
}
492
549
default:
493
550
return ARGP_ERR_UNKNOWN;
494
551
}
495
return 0;
552
return errno; /* Set to 0 at start */
496
553
}
497
554
498
555
/* This option parser is the same as parse_opt() above, except it
499
556
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
504
562
case 'g': /* --global-options */
505
563
case 'G': /* --global-env */
506
564
case 'o': /* --options-for */
510
568
case 128: /* --plugin-dir */
511
569
break;
512
570
case 129: /* --config-file */
571
free(argfile);
513
572
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
516
}
517
break;
573
break;
518
574
case 130: /* --userid */
519
575
case 131: /* --groupid */
520
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
521
580
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
523
581
break;
524
582
default:
525
583
return ARGP_ERR_UNKNOWN;
526
584
}
527
return 0;
585
return errno;
528
586
}
529
587
530
588
struct argp argp = { .options = options,
532
590
.args_doc = "",
533
591
.doc = "Mandos plugin runner -- Run plugins" };
534
592
535
/* Parse using the parse_opt_config_file in order to get the custom
593
/* Parse using parse_opt_config_file() in order to get the custom
536
594
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
538
if (ret == ARGP_ERR_UNKNOWN){
539
fprintf(stderr, "Unknown error while parsing arguments\n");
540
exitstatus = EXIT_FAILURE;
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
541
609
goto fallback;
542
610
}
543
611
545
613
argp.parser = parse_opt;
546
614
547
615
/* Open the configfile if available */
548
if (argfile == NULL){
616
if(argfile == NULL){
549
617
conffp = fopen(AFILE, "r");
550
618
} else {
551
619
conffp = fopen(argfile, "r");
552
}
620
}
553
621
if(conffp != NULL){
554
622
char *org_line = NULL;
555
623
char *p, *arg, *new_arg, *line;
556
624
size_t size = 0;
557
ssize_t sret;
558
625
const char whitespace_delims[] = " \r\t\f\v\n";
559
626
const char comment_delim[] = "#";
560
627
561
628
custom_argc = 1;
562
629
custom_argv = malloc(sizeof(char*) * 2);
563
630
if(custom_argv == NULL){
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
566
633
goto fallback;
567
634
}
568
635
custom_argv[0] = argv[0];
569
636
custom_argv[1] = NULL;
570
637
571
638
/* for each line in the config file, strip whitespace and ignore
572
639
commented text */
573
640
while(true){
575
642
if(sret == -1){
576
643
break;
577
644
}
578
645
579
646
line = org_line;
580
647
arg = strsep(&line, comment_delim);
581
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
584
651
}
585
652
new_arg = strdup(p);
586
653
if(new_arg == NULL){
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
589
656
free(org_line);
590
657
goto fallback;
591
658
}
594
661
custom_argv = realloc(custom_argv, sizeof(char *)
595
662
* ((unsigned int) custom_argc + 1));
596
663
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
599
666
free(org_line);
600
667
goto fallback;
601
668
}
602
669
custom_argv[custom_argc-1] = new_arg;
603
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
604
671
}
605
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
606
681
free(org_line);
607
682
} else {
608
683
/* Check for harmful errors and go to fallback. Other errors might
609
684
not affect opening plugins */
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
613
688
goto fallback;
614
689
}
615
690
}
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
618
693
if(custom_argv != NULL){
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
621
if (ret == ARGP_ERR_UNKNOWN){
622
fprintf(stderr, "Unknown error while parsing arguments\n");
623
exitstatus = EXIT_FAILURE;
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
624
708
goto fallback;
625
709
}
626
710
}
627
711
628
712
/* Parse actual command line arguments, to let them override the
629
713
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
634
728
goto fallback;
635
729
}
636
730
641
735
for(char **a = p->argv; *a != NULL; a++){
642
736
fprintf(stderr, "\tArg: %s\n", *a);
643
737
}
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
645
739
for(char **a = p->environ; *a != NULL; a++){
646
740
fprintf(stderr, "\t%s\n", *a);
647
741
}
649
743
}
650
744
651
745
/* Strip permissions down to nobody */
746
setgid(gid);
747
if(ret == -1){
748
error(0, errno, "setgid");
749
}
652
750
ret = setuid(uid);
653
if (ret == -1){
654
perror("setuid");
655
}
656
setgid(gid);
657
if (ret == -1){
658
perror("setgid");
659
}
660
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
667
if(dir == NULL){
668
perror("Could not open plugin dir");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
671
}
672
673
/* Set the FD_CLOEXEC flag on the directory, if possible */
751
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
674
756
{
675
int dir_fd = dirfd(dir);
676
if(dir_fd >= 0){
677
ret = set_cloexec_flag(dir_fd);
678
if(ret < 0){
679
perror("set_cloexec_flag");
680
exitstatus = EXIT_FAILURE;
681
goto fallback;
682
}
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
683
798
}
684
799
}
685
800
687
802
688
803
/* Read and execute any executable in the plugin directory*/
689
804
while(true){
690
dirst = readdir(dir);
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
691
808
692
809
/* All directory entries have been processed */
693
810
if(dirst == NULL){
694
if (errno == EBADF){
695
perror("readdir");
696
exitstatus = EXIT_FAILURE;
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
697
814
goto fallback;
698
815
}
699
816
break;
709
826
710
827
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
711
828
".dpkg-old",
829
".dpkg-bak",
712
830
".dpkg-divert", NULL };
713
831
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
714
832
size_t pre_len = strlen(*pre);
728
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
729
847
size_t suf_len = strlen(*suf);
730
848
if((d_name_len >= suf_len)
731
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
732
850
== 0)){
733
851
if(debug){
734
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
743
861
continue;
744
862
}
745
863
}
746
864
747
865
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
866
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
869
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
873
}
749
874
if(ret < 0){
750
perror("asprintf");
875
error(0, errno, "asprintf");
751
876
continue;
752
877
}
753
878
754
ret = stat(filename, &st);
755
if (ret == -1){
756
perror("stat");
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
880
if(ret == -1){
881
error(0, errno, "stat");
757
882
free(filename);
758
883
continue;
759
884
}
760
885
761
886
/* Ignore non-executable files */
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
763
889
if(debug){
764
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
891
" with bad type or mode\n", filename);
770
896
771
897
plugin *p = getplugin(dirst->d_name);
772
898
if(p == NULL){
773
perror("getplugin");
899
error(0, errno, "getplugin");
774
900
free(filename);
775
901
continue;
776
902
}
788
914
if(g != NULL){
789
915
for(char **a = g->argv + 1; *a != NULL; a++){
790
916
if(not add_argument(p, *a)){
791
perror("add_argument");
917
error(0, errno, "add_argument");
792
918
}
793
919
}
794
920
/* Add global environment variables */
795
921
for(char **e = g->environ; *e != NULL; e++){
796
922
if(not add_environment(p, *e, false)){
797
perror("add_environment");
923
error(0, errno, "add_environment");
798
924
}
799
925
}
800
926
}
805
931
if(p->environ[0] != NULL){
806
932
for(char **e = environ; *e != NULL; e++){
807
933
if(not add_environment(p, *e, false)){
808
perror("add_environment");
934
error(0, errno, "add_environment");
809
935
}
810
936
}
811
937
}
812
938
813
939
int pipefd[2];
814
ret = pipe(pipefd);
815
if (ret == -1){
816
perror("pipe");
817
exitstatus = EXIT_FAILURE;
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
818
944
goto fallback;
819
945
}
820
946
/* Ask OS to automatic close the pipe on exec */
821
947
ret = set_cloexec_flag(pipefd[0]);
822
948
if(ret < 0){
823
perror("set_cloexec_flag");
824
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
825
951
goto fallback;
826
952
}
827
953
ret = set_cloexec_flag(pipefd[1]);
828
954
if(ret < 0){
829
perror("set_cloexec_flag");
830
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
831
957
goto fallback;
832
958
}
833
959
/* Block SIGCHLD until process is safely in process list */
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
835
963
if(ret < 0){
836
perror("sigprocmask");
837
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
838
966
goto fallback;
839
967
}
840
968
/* Starting a new process to be watched */
841
pid_t pid = fork();
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
842
973
if(pid == -1){
843
perror("fork");
844
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
845
976
goto fallback;
846
977
}
847
978
if(pid == 0){
848
979
/* this is the child process */
849
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
850
981
if(ret < 0){
851
perror("sigaction");
852
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
853
984
}
854
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
855
986
if(ret < 0){
856
perror("sigprocmask");
857
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
858
989
}
859
990
860
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
861
992
if(ret == -1){
862
perror("dup2");
863
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
864
995
}
865
996
866
997
if(dirfd(dir) < 0){
870
1001
}
871
1002
if(p->environ[0] == NULL){
872
1003
if(execv(filename, p->argv) < 0){
873
perror("execv");
874
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
875
1006
}
876
1007
} else {
877
1008
if(execve(filename, p->argv, p->environ) < 0){
878
perror("execve");
879
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
880
1011
}
881
1012
}
882
1013
/* no return */
883
1014
}
884
1015
/* Parent process */
885
close(pipefd[1]); /* Close unused write end of pipe */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
886
1018
free(filename);
887
1019
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
890
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1020
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
891
1025
if(ret < 0){
892
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
893
1027
}
894
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
895
1029
goto fallback;
896
1030
}
897
1031
900
1034
901
1035
/* Unblock SIGCHLD so signal handler can be run if this process
902
1036
has already completed */
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
904
1040
if(ret < 0){
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
907
1043
goto fallback;
908
1044
}
909
1045
910
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
911
1048
912
if (maxfd < new_plugin->fd){
1049
if(maxfd < new_plugin->fd){
913
1050
maxfd = new_plugin->fd;
914
1051
}
915
916
1052
}
917
1053
918
closedir(dir);
1054
TEMP_FAILURE_RETRY(closedir(dir));
919
1055
dir = NULL;
920
1056
free_plugin(getplugin(NULL));
1057
921
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
1059
if(p->pid != 0){
923
1060
break;
928
1065
free_plugin_list();
929
1066
}
930
1067
}
931
1068
932
1069
/* Main loop while running plugins exist */
933
1070
while(plugin_list){
934
1071
fd_set rfds = rfds_all;
935
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
936
if (select_ret == -1){
937
perror("select");
938
exitstatus = EXIT_FAILURE;
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
939
1076
goto fallback;
940
1077
}
941
1078
/* OK, now either a process completed, or something can be read
942
1079
from one of them */
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1080
for(plugin *proc = plugin_list; proc != NULL;){
944
1081
/* Is this process completely done? */
945
if(proc->eof and proc->completed){
1082
if(proc->completed and proc->eof){
946
1083
/* Only accept the plugin output if it exited cleanly */
947
1084
if(not WIFEXITED(proc->status)
948
1085
or WEXITSTATUS(proc->status) != 0){
949
1086
/* Bad exit by plugin */
950
1087
951
1088
if(debug){
952
1089
if(WIFEXITED(proc->status)){
953
fprintf(stderr, "Plugin %u exited with status %d\n",
954
(unsigned int) (proc->pid),
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
955
1093
WEXITSTATUS(proc->status));
956
} else if(WIFSIGNALED(proc->status)) {
957
fprintf(stderr, "Plugin %u killed by signal %d\n",
958
(unsigned int) (proc->pid),
959
WTERMSIG(proc->status));
1094
} else if(WIFSIGNALED(proc->status)){
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
1097
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
960
1100
} else if(WCOREDUMP(proc->status)){
961
fprintf(stderr, "Plugin %d dumped core\n",
962
(unsigned int) (proc->pid));
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
963
1103
}
964
1104
}
965
1105
966
1106
/* Remove the plugin */
967
FD_CLR(proc->fd, &rfds_all);
968
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
969
1110
/* Block signal while modifying process_list */
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
971
1115
if(ret < 0){
972
perror("sigprocmask");
973
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
974
1118
goto fallback;
975
1119
}
1120
1121
plugin *next_plugin = proc->next;
976
1122
free_plugin(proc);
1123
proc = next_plugin;
1124
977
1125
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
980
1129
if(ret < 0){
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
983
1132
goto fallback;
984
1133
}
985
1134
986
1135
if(plugin_list == NULL){
987
1136
break;
988
1137
}
1138
989
1139
continue;
990
1140
}
991
1141
992
1142
/* This process exited nicely, so print its buffer */
993
1143
994
1144
bool bret = print_out_password(proc->buffer,
995
1145
proc->buffer_length);
996
1146
if(not bret){
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
999
1149
}
1000
1150
goto fallback;
1001
1151
}
1002
1152
1003
1153
/* This process has not completed. Does it have any output? */
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1005
1157
/* This process had nothing to say at this time */
1158
proc = proc->next;
1006
1159
continue;
1007
1160
}
1008
1161
/* Before reading, make the process' data buffer large enough */
1009
1162
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1010
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
1164
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1165
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1015
1168
goto fallback;
1016
1169
}
1017
1170
proc->buffer_size += BUFFER_SIZE;
1018
1171
}
1019
1172
/* Read from the process */
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1177
if(sret < 0){
1023
1178
/* Read error from this process; ignore the error */
1179
proc = proc->next;
1024
1180
continue;
1025
1181
}
1026
if(ret == 0){
1182
if(sret == 0){
1027
1183
/* got EOF */
1028
1184
proc->eof = true;
1029
1185
} else {
1030
proc->buffer_length += (size_t) ret;
1186
proc->buffer_length += (size_t) sret;
1031
1187
}
1032
1188
}
1033
1189
}
1034
1035
1190
1191
1036
1192
fallback:
1037
1193
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1039
1196
/* Fallback if all plugins failed, none are found or an error
1040
1197
occured */
1041
1198
bool bret;
1042
1199
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1043
1200
char *passwordbuffer = getpass("Password: ");
1044
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1201
size_t len = strlen(passwordbuffer);
1202
/* Strip trailing newline */
1203
if(len > 0 and passwordbuffer[len-1] == '\n'){
1204
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1205
len--;
1206
}
1207
bret = print_out_password(passwordbuffer, len);
1045
1208
if(not bret){
1046
perror("print_out_password");
1047
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1048
1211
}
1049
1212
}
1050
1213
1051
1214
/* Restore old signal handler */
1052
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
1216
if(ret == -1){
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1056
1219
}
1057
1220
1058
1221
if(custom_argv != NULL){
1059
1222
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1060
1223
free(*arg);
1066
1229
closedir(dir);
1067
1230
}
1068
1231
1069
/* Free the process list and kill the processes */
1232
/* Kill the processes */
1070
1233
for(plugin *p = plugin_list; p != NULL; p = p->next){
1071
1234
if(p->pid != 0){
1072
1235
close(p->fd);
1073
1236
ret = kill(p->pid, SIGTERM);
1074
1237
if(ret == -1 and errno != ESRCH){
1075
1238
/* Set-uid proccesses might not get closed */
1076
perror("kill");
1239
error(0, errno, "kill");
1077
1240
}
1078
1241
}
1079
1242
}
1080
1243
1081
1244
/* Wait for any remaining child processes to terminate */
1082
do{
1245
do {
1083
1246
ret = wait(NULL);
1084
1247
} while(ret >= 0);
1085
1248
if(errno != ECHILD){
1086
perror("wait");
1249
error(0, errno, "wait");
1087
1250
}
1088
1251
1089
1252
free_plugin_list();
1090
1253
1091
1254
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0