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- Committer: Teddy Hogeborn
- Date: 2008-09-02 13:04:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20080902130442-ytnjsmllaph18e20
* plugin-runner.xml (PLUGINS/WRITING PLUGINS): New section.
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#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
66
74
67
#define BUFFER_SIZE 256
75
68
76
69
#define PDIR "/lib/mandos/plugins.d"
77
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
71
79
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
80
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
74
75
struct plugin;
76
82
77
typedef struct plugin{
83
78
char *name; /* can be NULL or any plugin name */
84
79
char **argv;
86
81
char **environ;
87
82
int envc;
88
83
bool disabled;
89
84
90
85
/* Variables used for running processes*/
91
86
pid_t pid;
92
87
int fd;
94
89
size_t buffer_size;
95
90
size_t buffer_length;
96
91
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
92
volatile bool completed;
93
volatile int status;
99
94
struct plugin *next;
100
95
} plugin;
101
96
102
97
static plugin *plugin_list = NULL;
103
98
104
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
105
100
or if none is found, creates a new one */
106
101
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
111
106
return p;
112
107
}
113
108
}
114
109
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
120
112
return NULL;
121
113
}
122
114
char *copy_name = NULL;
123
115
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
127
117
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
118
return NULL;
132
119
}
133
120
}
134
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
139
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
145
129
free(copy_name);
146
130
free(new_plugin);
147
errno = e;
148
131
return NULL;
149
132
}
150
133
new_plugin->argv[0] = copy_name;
151
134
new_plugin->argv[1] = NULL;
152
135
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
156
137
if(new_plugin->environ == NULL){
157
int e = errno;
158
138
free(copy_name);
159
139
free(new_plugin->argv);
160
140
free(new_plugin);
161
errno = e;
162
141
return NULL;
163
142
}
164
143
new_plugin->environ[0] = NULL;
172
151
static bool add_to_char_array(const char *new, char ***array,
173
152
int *len){
174
153
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
179
156
/* Malloc check */
180
157
if(*array == NULL){
181
158
return false;
182
159
}
183
160
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
188
162
if(copy == NULL){
189
163
return false;
190
164
}
213
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
188
/* Search for this environment variable */
215
189
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
190
if(strncmp(*e, def, namelen+1) == 0){
217
191
/* It already exists */
218
192
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def));
223
194
if(new == NULL){
224
195
return false;
225
196
}
235
206
/*
236
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
208
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
210
*/
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
242
214
/* If reading the flags failed, return error indication now. */
243
215
if(ret < 0){
244
216
return ret;
245
217
}
246
218
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
220
}
250
221
251
222
252
223
/* Mark processes as completed when they exit, and save their exit
253
224
status. */
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
256
226
while(true){
257
227
plugin *proc = plugin_list;
258
228
int status;
262
232
break;
263
233
}
264
234
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
235
if (errno != ECHILD){
236
perror("waitpid");
268
237
}
269
perror("waitpid");
238
/* No child processes */
239
break;
270
240
}
271
241
272
242
/* A child exited, find it in process_list */
273
243
while(proc != NULL and proc->pid != pid){
274
244
proc = proc->next;
278
248
continue;
279
249
}
280
250
proc->status = status;
281
proc->completed = 1;
251
proc->completed = true;
282
252
}
283
errno = old_errno;
284
253
}
285
254
286
255
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
288
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
289
261
for(size_t written = 0; written < length; written += (size_t)ret){
290
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
263
length - written));
308
280
}
309
281
free(plugin_node->environ);
310
282
free(plugin_node->buffer);
311
283
312
284
/* Removes the plugin from the singly-linked list */
313
285
if(plugin_node == plugin_list){
314
286
/* First one - simple */
342
314
struct stat st;
343
315
fd_set rfds_all;
344
316
int ret, maxfd = 0;
345
ssize_t sret;
346
317
uid_t uid = 65534;
347
318
gid_t gid = 65534;
348
319
bool debug = false;
358
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
330
if(ret == -1){
360
331
perror("sigaddset");
361
exitstatus = EX_OSERR;
332
exitstatus = EXIT_FAILURE;
362
333
goto fallback;
363
334
}
364
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
336
if(ret == -1){
366
337
perror("sigaction");
367
exitstatus = EX_OSERR;
338
exitstatus = EXIT_FAILURE;
368
339
goto fallback;
369
340
}
370
341
402
373
.doc = "Group ID the plugins will run as", .group = 3 },
403
374
{ .name = "debug", .key = 132,
404
375
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
414
376
{ .name = NULL }
415
377
};
416
378
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
422
382
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
428
392
}
429
393
}
430
394
}
431
395
break;
432
396
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
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
}
434
409
break;
435
410
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
454
430
}
455
431
}
456
432
}
457
433
break;
458
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
459
438
{
460
439
char *envdef = strchr(arg, ':');
461
440
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
467
447
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
472
450
}
473
add_environment(getplugin(arg), envdef, true);
474
451
}
475
452
break;
476
453
case 'd': /* --disable */
477
{
454
if (arg != NULL){
478
455
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
481
458
}
459
p->disabled = true;
482
460
}
483
461
break;
484
462
case 'e': /* --enable */
485
{
463
if (arg != NULL){
486
464
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
489
467
}
468
p->disabled = false;
490
469
}
491
470
break;
492
471
case 128: /* --plugin-dir */
493
free(plugindir);
494
472
plugindir = strdup(arg);
473
if(plugindir == NULL){
474
perror("strdup");
475
}
495
476
break;
496
477
case 129: /* --config-file */
497
478
/* This is already done by parse_opt_config_file() */
498
479
break;
499
480
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
481
uid = (uid_t)strtol(arg, NULL, 10);
508
482
break;
509
483
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
484
gid = (gid_t)strtol(arg, NULL, 10);
518
485
break;
519
486
case 132: /* --debug */
520
487
debug = true;
521
488
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
489
case ARGP_KEY_ARG:
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
546
}
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
547
494
default:
548
495
return ARGP_ERR_UNKNOWN;
549
496
}
550
return errno; /* Set to 0 at start */
497
return 0;
551
498
}
552
499
553
500
/* This option parser is the same as parse_opt() above, except it
554
501
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
560
506
case 'g': /* --global-options */
561
507
case 'G': /* --global-env */
562
508
case 'o': /* --options-for */
566
512
case 128: /* --plugin-dir */
567
513
break;
568
514
case 129: /* --config-file */
569
free(argfile);
570
515
argfile = strdup(arg);
571
break;
516
if(argfile == NULL){
517
perror("strdup");
518
}
519
break;
572
520
case 130: /* --userid */
573
521
case 131: /* --groupid */
574
522
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
579
525
break;
580
526
default:
581
527
return ARGP_ERR_UNKNOWN;
582
528
}
583
return errno;
529
return 0;
584
530
}
585
531
586
532
struct argp argp = { .options = options,
588
534
.args_doc = "",
589
535
.doc = "Mandos plugin runner -- Run plugins" };
590
536
591
/* Parse using parse_opt_config_file() in order to get the custom
537
/* Parse using the parse_opt_config_file in order to get the custom
592
538
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
607
543
goto fallback;
608
544
}
609
545
611
547
argp.parser = parse_opt;
612
548
613
549
/* Open the configfile if available */
614
if(argfile == NULL){
550
if (argfile == NULL){
615
551
conffp = fopen(AFILE, "r");
616
552
} else {
617
553
conffp = fopen(argfile, "r");
618
}
554
}
619
555
if(conffp != NULL){
620
556
char *org_line = NULL;
621
557
char *p, *arg, *new_arg, *line;
622
558
size_t size = 0;
559
ssize_t sret;
623
560
const char whitespace_delims[] = " \r\t\f\v\n";
624
561
const char comment_delim[] = "#";
625
562
626
563
custom_argc = 1;
627
564
custom_argv = malloc(sizeof(char*) * 2);
628
565
if(custom_argv == NULL){
629
566
perror("malloc");
630
exitstatus = EX_OSERR;
567
exitstatus = EXIT_FAILURE;
631
568
goto fallback;
632
569
}
633
570
custom_argv[0] = argv[0];
634
571
custom_argv[1] = NULL;
635
572
636
573
/* for each line in the config file, strip whitespace and ignore
637
574
commented text */
638
575
while(true){
640
577
if(sret == -1){
641
578
break;
642
579
}
643
580
644
581
line = org_line;
645
582
arg = strsep(&line, comment_delim);
646
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
587
new_arg = strdup(p);
651
588
if(new_arg == NULL){
652
589
perror("strdup");
653
exitstatus = EX_OSERR;
590
exitstatus = EXIT_FAILURE;
654
591
free(org_line);
655
592
goto fallback;
656
593
}
660
597
* ((unsigned int) custom_argc + 1));
661
598
if(custom_argv == NULL){
662
599
perror("realloc");
663
exitstatus = EX_OSERR;
600
exitstatus = EXIT_FAILURE;
664
601
free(org_line);
665
602
goto fallback;
666
603
}
667
604
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
669
606
}
670
607
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
608
free(org_line);
680
609
} else {
681
610
/* Check for harmful errors and go to fallback. Other errors might
682
611
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
613
perror("fopen");
685
exitstatus = EX_OSERR;
614
exitstatus = EXIT_FAILURE;
686
615
goto fallback;
687
616
}
688
617
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
691
620
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
706
626
goto fallback;
707
627
}
708
628
}
709
629
710
630
/* Parse actual command line arguments, to let them override the
711
631
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
726
636
goto fallback;
727
637
}
728
638
733
643
for(char **a = p->argv; *a != NULL; a++){
734
644
fprintf(stderr, "\tArg: %s\n", *a);
735
645
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
647
for(char **a = p->environ; *a != NULL; a++){
738
648
fprintf(stderr, "\t%s\n", *a);
739
649
}
741
651
}
742
652
743
653
/* Strip permissions down to nobody */
654
ret = setuid(uid);
655
if (ret == -1){
656
perror("setuid");
657
}
744
658
setgid(gid);
745
if(ret == -1){
659
if (ret == -1){
746
660
perror("setgid");
747
661
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* Open plugin directory with close_on_exec flag */
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
676
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
684
}
796
685
}
797
686
}
798
687
800
689
801
690
/* Read and execute any executable in the plugin directory*/
802
691
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
692
dirst = readdir(dir);
806
693
807
694
/* All directory entries have been processed */
808
695
if(dirst == NULL){
809
if(errno == EBADF){
696
if (errno == EBADF){
810
697
perror("readdir");
811
exitstatus = EX_IOERR;
698
exitstatus = EXIT_FAILURE;
812
699
goto fallback;
813
700
}
814
701
break;
824
711
825
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
713
".dpkg-old",
827
".dpkg-bak",
828
714
".dpkg-divert", NULL };
829
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
716
size_t pre_len = strlen(*pre);
844
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
731
size_t suf_len = strlen(*suf);
846
732
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
734
== 0)){
849
735
if(debug){
850
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
745
continue;
860
746
}
861
747
}
862
748
863
749
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
872
751
if(ret < 0){
873
752
perror("asprintf");
874
753
continue;
875
754
}
876
755
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
756
ret = stat(filename, &st);
757
if (ret == -1){
879
758
perror("stat");
880
759
free(filename);
881
760
continue;
882
761
}
883
762
884
763
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
765
if(debug){
888
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
767
" with bad type or mode\n", filename);
935
813
}
936
814
937
815
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
816
ret = pipe(pipefd);
817
if (ret == -1){
940
818
perror("pipe");
941
exitstatus = EX_OSERR;
819
exitstatus = EXIT_FAILURE;
942
820
goto fallback;
943
821
}
944
822
/* Ask OS to automatic close the pipe on exec */
945
823
ret = set_cloexec_flag(pipefd[0]);
946
824
if(ret < 0){
947
825
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
826
exitstatus = EXIT_FAILURE;
949
827
goto fallback;
950
828
}
951
829
ret = set_cloexec_flag(pipefd[1]);
952
830
if(ret < 0){
953
831
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
832
exitstatus = EXIT_FAILURE;
955
833
goto fallback;
956
834
}
957
835
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
837
if(ret < 0){
962
838
perror("sigprocmask");
963
exitstatus = EX_OSERR;
839
exitstatus = EXIT_FAILURE;
964
840
goto fallback;
965
841
}
966
842
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
971
844
if(pid == -1){
972
845
perror("fork");
973
exitstatus = EX_OSERR;
846
exitstatus = EXIT_FAILURE;
974
847
goto fallback;
975
848
}
976
849
if(pid == 0){
978
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
852
if(ret < 0){
980
853
perror("sigaction");
981
_exit(EX_OSERR);
854
_exit(EXIT_FAILURE);
982
855
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
857
if(ret < 0){
985
858
perror("sigprocmask");
986
_exit(EX_OSERR);
859
_exit(EXIT_FAILURE);
987
860
}
988
861
989
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
863
if(ret == -1){
991
864
perror("dup2");
992
_exit(EX_OSERR);
865
_exit(EXIT_FAILURE);
993
866
}
994
867
995
868
if(dirfd(dir) < 0){
1000
873
if(p->environ[0] == NULL){
1001
874
if(execv(filename, p->argv) < 0){
1002
875
perror("execv");
1003
_exit(EX_OSERR);
876
_exit(EXIT_FAILURE);
1004
877
}
1005
878
} else {
1006
879
if(execve(filename, p->argv, p->environ) < 0){
1007
880
perror("execve");
1008
_exit(EX_OSERR);
881
_exit(EXIT_FAILURE);
1009
882
}
1010
883
}
1011
884
/* no return */
1012
885
}
1013
886
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
887
close(pipefd[1]); /* Close unused write end of pipe */
1016
888
free(filename);
1017
889
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
890
if (new_plugin == NULL){
1019
891
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
893
if(ret < 0){
1024
894
perror("sigprocmask");
1025
895
}
1026
exitstatus = EX_OSERR;
896
exitstatus = EXIT_FAILURE;
1027
897
goto fallback;
1028
898
}
1029
899
1032
902
1033
903
/* Unblock SIGCHLD so signal handler can be run if this process
1034
904
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
906
if(ret < 0){
1039
907
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
908
exitstatus = EXIT_FAILURE;
1041
909
goto fallback;
1042
910
}
1043
911
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
912
FD_SET(new_plugin->fd, &rfds_all);
1046
913
1047
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1048
915
maxfd = new_plugin->fd;
1049
916
}
917
1050
918
}
1051
919
1052
TEMP_FAILURE_RETRY(closedir(dir));
920
closedir(dir);
1053
921
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
922
1056
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
924
if(p->pid != 0){
1058
925
break;
1063
930
free_plugin_list();
1064
931
}
1065
932
}
1066
933
1067
934
/* Main loop while running plugins exist */
1068
935
while(plugin_list){
1069
936
fd_set rfds = rfds_all;
1070
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
938
if (select_ret == -1){
1072
939
perror("select");
1073
exitstatus = EX_OSERR;
940
exitstatus = EXIT_FAILURE;
1074
941
goto fallback;
1075
942
}
1076
943
/* OK, now either a process completed, or something can be read
1077
944
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1079
946
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1081
948
/* Only accept the plugin output if it exited cleanly */
1082
949
if(not WIFEXITED(proc->status)
1083
950
or WEXITSTATUS(proc->status) != 0){
1084
951
/* Bad exit by plugin */
1085
952
1086
953
if(debug){
1087
954
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1091
957
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
1098
962
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1101
965
}
1102
966
}
1103
967
1104
968
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
969
FD_CLR(proc->fd, &rfds_all);
970
1108
971
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
973
if(ret < 0){
1114
974
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
975
exitstatus = EXIT_FAILURE;
1116
976
goto fallback;
1117
977
}
1118
1119
plugin *next_plugin = proc->next;
1120
978
free_plugin(proc);
1121
proc = next_plugin;
1122
1123
979
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1127
982
if(ret < 0){
1128
983
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
984
exitstatus = EXIT_FAILURE;
1130
985
goto fallback;
1131
986
}
1132
987
1133
988
if(plugin_list == NULL){
1134
989
break;
1135
990
}
1136
1137
991
continue;
1138
992
}
1139
993
1140
994
/* This process exited nicely, so print its buffer */
1141
995
1142
996
bool bret = print_out_password(proc->buffer,
1143
997
proc->buffer_length);
1144
998
if(not bret){
1145
999
perror("print_out_password");
1146
exitstatus = EX_IOERR;
1000
exitstatus = EXIT_FAILURE;
1147
1001
}
1148
1002
goto fallback;
1149
1003
}
1150
1004
1151
1005
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1007
/* This process had nothing to say at this time */
1156
proc = proc->next;
1157
1008
continue;
1158
1009
}
1159
1010
/* Before reading, make the process' data buffer large enough */
1160
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
1013
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1014
if (proc->buffer == NULL){
1164
1015
perror("malloc");
1165
exitstatus = EX_OSERR;
1016
exitstatus = EXIT_FAILURE;
1166
1017
goto fallback;
1167
1018
}
1168
1019
proc->buffer_size += BUFFER_SIZE;
1169
1020
}
1170
1021
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1176
1025
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1178
1026
continue;
1179
1027
}
1180
if(sret == 0){
1028
if(ret == 0){
1181
1029
/* got EOF */
1182
1030
proc->eof = true;
1183
1031
} else {
1184
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1185
1033
}
1186
1034
}
1187
1035
}
1188
1189
1036
1037
1190
1038
fallback:
1191
1039
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1041
/* Fallback if all plugins failed, none are found or an error
1195
1042
occured */
1196
1043
bool bret;
1197
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
1045
char *passwordbuffer = getpass("Password: ");
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1203
len--;
1204
}
1205
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1206
1047
if(not bret){
1207
1048
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1049
exitstatus = EXIT_FAILURE;
1209
1050
}
1210
1051
}
1211
1052
1213
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1055
if(ret == -1){
1215
1056
perror("sigaction");
1216
exitstatus = EX_OSERR;
1057
exitstatus = EXIT_FAILURE;
1217
1058
}
1218
1059
1219
1060
if(custom_argv != NULL){
1220
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1221
1062
free(*arg);
1227
1068
closedir(dir);
1228
1069
}
1229
1070
1230
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1231
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
1073
if(p->pid != 0){
1233
1074
close(p->fd);
1240
1081
}
1241
1082
1242
1083
/* Wait for any remaining child processes to terminate */
1243
do {
1084
do{
1244
1085
ret = wait(NULL);
1245
1086
} while(ret >= 0);
1246
1087
if(errno != ECHILD){
1247
1088
perror("wait");
1248
1089
}
1249
1090
1250
1091
free_plugin_list();
1251
1092
1252
1093
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0