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- Committer: Teddy Hogeborn
- Date: 2008-09-04 14:12:10 UTC
- Revision ID: teddy@fukt.bsnet.se-20080904141210-ig3or8uiz3cpxatj
* plugins.d/password-request.xml (EXAMPLE): Improved wording.
- 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
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
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() */
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 */
72
66
73
67
#define BUFFER_SIZE 256
74
68
75
69
#define PDIR "/lib/mandos/plugins.d"
76
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
71
78
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
79
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
80
74
75
struct plugin;
76
81
77
typedef struct plugin{
82
78
char *name; /* can be NULL or any plugin name */
83
79
char **argv;
85
81
char **environ;
86
82
int envc;
87
83
bool disabled;
88
84
89
85
/* Variables used for running processes*/
90
86
pid_t pid;
91
87
int fd;
93
89
size_t buffer_size;
94
90
size_t buffer_length;
95
91
bool eof;
96
volatile sig_atomic_t completed;
97
int status;
92
volatile bool completed;
93
volatile int status;
98
94
struct plugin *next;
99
95
} plugin;
100
96
101
97
static plugin *plugin_list = NULL;
102
98
103
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
104
100
or if none is found, creates a new one */
105
101
static plugin *getplugin(char *name){
106
/* Check for existing plugin with that name */
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
if((p->name == name)
109
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
110
106
return p;
111
107
}
112
108
}
113
109
/* Create a new plugin */
114
plugin *new_plugin = NULL;
115
do {
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
118
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
112
return NULL;
120
113
}
121
114
char *copy_name = NULL;
122
115
if(name != NULL){
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
126
117
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
130
118
return NULL;
131
119
}
132
120
}
133
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
138
139
do {
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
142
if(new_plugin->argv == NULL){
143
int e = errno;
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){
144
129
free(copy_name);
145
130
free(new_plugin);
146
errno = e;
147
131
return NULL;
148
132
}
149
133
new_plugin->argv[0] = copy_name;
150
134
new_plugin->argv[1] = NULL;
151
135
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
155
137
if(new_plugin->environ == NULL){
156
int e = errno;
157
138
free(copy_name);
158
139
free(new_plugin->argv);
159
140
free(new_plugin);
160
errno = e;
161
141
return NULL;
162
142
}
163
143
new_plugin->environ[0] = NULL;
171
151
static bool add_to_char_array(const char *new, char ***array,
172
152
int *len){
173
153
/* Resize the pointed-to array to hold one more pointer */
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
178
156
/* Malloc check */
179
157
if(*array == NULL){
180
158
return false;
181
159
}
182
160
/* Make a copy of the new string */
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
187
162
if(copy == NULL){
188
163
return false;
189
164
}
212
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
188
/* Search for this environment variable */
214
189
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
190
if(strncmp(*e, def, namelen+1) == 0){
216
191
/* It already exists */
217
192
if(replace){
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def));
222
194
if(new == NULL){
223
195
return false;
224
196
}
234
206
/*
235
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
208
* Descriptor Flags".
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
210
*/
239
static int set_cloexec_flag(int fd){
240
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);
241
214
/* If reading the flags failed, return error indication now. */
242
215
if(ret < 0){
243
216
return ret;
244
217
}
245
218
/* Store modified flag word in the descriptor. */
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
248
220
}
249
221
250
222
251
223
/* Mark processes as completed when they exit, and save their exit
252
224
status. */
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
255
226
while(true){
256
227
plugin *proc = plugin_list;
257
228
int status;
261
232
break;
262
233
}
263
234
if(pid == -1){
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
235
if (errno != ECHILD){
236
perror("waitpid");
267
237
}
268
perror("waitpid");
238
/* No child processes */
239
break;
269
240
}
270
241
271
242
/* A child exited, find it in process_list */
272
243
while(proc != NULL and proc->pid != pid){
273
244
proc = proc->next;
277
248
continue;
278
249
}
279
250
proc->status = status;
280
proc->completed = 1;
251
proc->completed = true;
281
252
}
282
errno = old_errno;
283
253
}
284
254
285
255
/* Prints out a password to stdout */
286
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
287
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
288
261
for(size_t written = 0; written < length; written += (size_t)ret){
289
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
290
263
length - written));
307
280
}
308
281
free(plugin_node->environ);
309
282
free(plugin_node->buffer);
310
283
311
284
/* Removes the plugin from the singly-linked list */
312
285
if(plugin_node == plugin_list){
313
286
/* First one - simple */
341
314
struct stat st;
342
315
fd_set rfds_all;
343
316
int ret, maxfd = 0;
344
ssize_t sret;
345
317
uid_t uid = 65534;
346
318
gid_t gid = 65534;
347
319
bool debug = false;
401
373
.doc = "Group ID the plugins will run as", .group = 3 },
402
374
{ .name = "debug", .key = 132,
403
375
.doc = "Debug mode", .group = 4 },
404
/*
405
* These reproduce what we would get without ARGP_NO_HELP
406
*/
407
{ .name = "help", .key = '?',
408
.doc = "Give this help list", .group = -1 },
409
{ .name = "usage", .key = -3,
410
.doc = "Give a short usage message", .group = -1 },
411
{ .name = "version", .key = 'V',
412
.doc = "Print program version", .group = -1 },
413
376
{ .name = NULL }
414
377
};
415
378
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
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
421
382
case 'g': /* --global-options */
422
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
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;
427
392
}
428
393
}
429
394
}
430
395
break;
431
396
case 'G': /* --global-env */
432
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
}
433
409
break;
434
410
case 'o': /* --options-for */
435
{
436
char *option_list = strchr(arg, ':');
437
if(option_list == NULL){
438
argp_error(state, "No colon in \"%s\"", arg);
439
errno = EINVAL;
440
break;
441
}
442
*option_list = '\0';
443
option_list++;
444
if(arg[0] == '\0'){
445
argp_error(state, "Empty plugin name");
446
errno = EINVAL;
447
break;
448
}
449
char *option;
450
while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
452
break;
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
}
453
430
}
454
431
}
455
432
}
456
433
break;
457
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
458
438
{
459
439
char *envdef = strchr(arg, ':');
460
440
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*envdef = '\0';
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
466
447
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
471
450
}
472
add_environment(getplugin(arg), envdef, true);
473
451
}
474
452
break;
475
453
case 'd': /* --disable */
476
{
454
if (arg != NULL){
477
455
plugin *p = getplugin(arg);
478
if(p != NULL){
479
p->disabled = true;
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
480
458
}
459
p->disabled = true;
481
460
}
482
461
break;
483
462
case 'e': /* --enable */
484
{
463
if (arg != NULL){
485
464
plugin *p = getplugin(arg);
486
if(p != NULL){
487
p->disabled = false;
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
488
467
}
468
p->disabled = false;
489
469
}
490
470
break;
491
471
case 128: /* --plugin-dir */
492
free(plugindir);
493
472
plugindir = strdup(arg);
473
if(plugindir == NULL){
474
perror("strdup");
475
}
494
476
break;
495
477
case 129: /* --config-file */
496
478
/* This is already done by parse_opt_config_file() */
497
479
break;
498
480
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
500
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
502
argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
504
break;
505
}
506
uid = (uid_t)tmpmax;
481
uid = (uid_t)strtol(arg, NULL, 10);
507
482
break;
508
483
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
510
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
512
argp_error(state, "Bad group ID number: \"%s\", using %"
513
PRIdMAX, arg, (intmax_t)gid);
514
break;
515
}
516
gid = (gid_t)tmpmax;
484
gid = (gid_t)strtol(arg, NULL, 10);
517
485
break;
518
486
case 132: /* --debug */
519
487
debug = true;
520
488
break;
521
/*
522
* These reproduce what we would get without ARGP_NO_HELP
523
*/
524
case '?': /* --help */
525
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
527
case -3: /* --usage */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
532
fprintf(state->out_stream, "%s\n", argp_program_version);
533
exit(EXIT_SUCCESS);
534
break;
535
/*
536
* When adding more options before this line, remember to also add a
537
* "case" to the "parse_opt_config_file" function below.
538
*/
539
489
case ARGP_KEY_ARG:
540
/* Cryptsetup always passes an argument, which is an empty
541
string if "none" was specified in /etc/crypttab. So if
542
argument was empty, we ignore it silently. */
543
if(arg[0] == '\0'){
544
break;
545
}
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
546
494
default:
547
495
return ARGP_ERR_UNKNOWN;
548
496
}
549
return errno; /* Set to 0 at start */
497
return 0;
550
498
}
551
499
552
500
/* This option parser is the same as parse_opt() above, except it
553
501
ignores everything but the --config-file option. */
554
error_t parse_opt_config_file(int key, char *arg,
555
__attribute__((unused))
556
struct argp_state *state){
557
errno = 0;
558
switch(key){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
559
506
case 'g': /* --global-options */
560
507
case 'G': /* --global-env */
561
508
case 'o': /* --options-for */
565
512
case 128: /* --plugin-dir */
566
513
break;
567
514
case 129: /* --config-file */
568
free(argfile);
569
515
argfile = strdup(arg);
570
break;
516
if(argfile == NULL){
517
perror("strdup");
518
}
519
break;
571
520
case 130: /* --userid */
572
521
case 131: /* --groupid */
573
522
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
577
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
578
525
break;
579
526
default:
580
527
return ARGP_ERR_UNKNOWN;
581
528
}
582
return errno;
529
return 0;
583
530
}
584
531
585
532
struct argp argp = { .options = options,
587
534
.args_doc = "",
588
535
.doc = "Mandos plugin runner -- Run plugins" };
589
536
590
/* 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
591
538
config file location, if any. */
592
ret = argp_parse(&argp, argc, argv,
593
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
594
NULL, NULL);
595
switch(ret){
596
case 0:
597
break;
598
case ENOMEM:
599
default:
600
errno = ret;
601
perror("argp_parse");
602
exitstatus = EX_OSERR;
603
goto fallback;
604
case EINVAL:
605
exitstatus = EX_USAGE;
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;
606
543
goto fallback;
607
544
}
608
545
610
547
argp.parser = parse_opt;
611
548
612
549
/* Open the configfile if available */
613
if(argfile == NULL){
550
if (argfile == NULL){
614
551
conffp = fopen(AFILE, "r");
615
552
} else {
616
553
conffp = fopen(argfile, "r");
617
}
554
}
618
555
if(conffp != NULL){
619
556
char *org_line = NULL;
620
557
char *p, *arg, *new_arg, *line;
621
558
size_t size = 0;
559
ssize_t sret;
622
560
const char whitespace_delims[] = " \r\t\f\v\n";
623
561
const char comment_delim[] = "#";
624
562
625
563
custom_argc = 1;
626
564
custom_argv = malloc(sizeof(char*) * 2);
627
565
if(custom_argv == NULL){
631
569
}
632
570
custom_argv[0] = argv[0];
633
571
custom_argv[1] = NULL;
634
572
635
573
/* for each line in the config file, strip whitespace and ignore
636
574
commented text */
637
575
while(true){
639
577
if(sret == -1){
640
578
break;
641
579
}
642
580
643
581
line = org_line;
644
582
arg = strsep(&line, comment_delim);
645
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
664
602
goto fallback;
665
603
}
666
604
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
668
606
}
669
607
}
670
do {
671
ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
673
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
608
free(org_line);
679
609
} else {
680
610
/* Check for harmful errors and go to fallback. Other errors might
681
611
not affect opening plugins */
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
613
perror("fopen");
684
614
exitstatus = EXIT_FAILURE;
685
615
goto fallback;
686
616
}
687
617
}
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
690
620
if(custom_argv != NULL){
691
ret = argp_parse(&argp, custom_argc, custom_argv,
692
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
693
NULL, NULL);
694
switch(ret){
695
case 0:
696
break;
697
case ENOMEM:
698
default:
699
errno = ret;
700
perror("argp_parse");
701
exitstatus = EX_OSERR;
702
goto fallback;
703
case EINVAL:
704
exitstatus = EX_CONFIG;
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;
705
626
goto fallback;
706
627
}
707
628
}
708
629
709
630
/* Parse actual command line arguments, to let them override the
710
631
config file */
711
ret = argp_parse(&argp, argc, argv,
712
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
713
NULL, NULL);
714
switch(ret){
715
case 0:
716
break;
717
case ENOMEM:
718
default:
719
errno = ret;
720
perror("argp_parse");
721
exitstatus = EX_OSERR;
722
goto fallback;
723
case EINVAL:
724
exitstatus = EX_USAGE;
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;
725
636
goto fallback;
726
637
}
727
638
732
643
for(char **a = p->argv; *a != NULL; a++){
733
644
fprintf(stderr, "\tArg: %s\n", *a);
734
645
}
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
647
for(char **a = p->environ; *a != NULL; a++){
737
648
fprintf(stderr, "\t%s\n", *a);
738
649
}
740
651
}
741
652
742
653
/* Strip permissions down to nobody */
654
ret = setuid(uid);
655
if (ret == -1){
656
perror("setuid");
657
}
743
658
setgid(gid);
744
if(ret == -1){
659
if (ret == -1){
745
660
perror("setgid");
746
661
}
747
ret = setuid(uid);
748
if(ret == -1){
749
perror("setuid");
750
}
751
752
/* 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 */
753
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
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
}
795
685
}
796
686
}
797
687
799
689
800
690
/* Read and execute any executable in the plugin directory*/
801
691
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
692
dirst = readdir(dir);
805
693
806
694
/* All directory entries have been processed */
807
695
if(dirst == NULL){
808
if(errno == EBADF){
696
if (errno == EBADF){
809
697
perror("readdir");
810
698
exitstatus = EXIT_FAILURE;
811
699
goto fallback;
823
711
824
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
713
".dpkg-old",
826
".dpkg-bak",
827
714
".dpkg-divert", NULL };
828
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
716
size_t pre_len = strlen(*pre);
858
745
continue;
859
746
}
860
747
}
861
748
862
749
char *filename;
863
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
866
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
870
}
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
751
if(ret < 0){
872
752
perror("asprintf");
873
753
continue;
874
754
}
875
755
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
756
ret = stat(filename, &st);
757
if (ret == -1){
878
758
perror("stat");
879
759
free(filename);
880
760
continue;
881
761
}
882
762
883
763
/* Ignore non-executable files */
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
886
765
if(debug){
887
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
767
" with bad type or mode\n", filename);
934
813
}
935
814
936
815
int pipefd[2];
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
816
ret = pipe(pipefd);
817
if (ret == -1){
939
818
perror("pipe");
940
819
exitstatus = EXIT_FAILURE;
941
820
goto fallback;
954
833
goto fallback;
955
834
}
956
835
/* Block SIGCHLD until process is safely in process list */
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
837
if(ret < 0){
961
838
perror("sigprocmask");
962
839
exitstatus = EXIT_FAILURE;
963
840
goto fallback;
964
841
}
965
842
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
970
844
if(pid == -1){
971
845
perror("fork");
972
846
exitstatus = EXIT_FAILURE;
979
853
perror("sigaction");
980
854
_exit(EXIT_FAILURE);
981
855
}
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
857
if(ret < 0){
984
858
perror("sigprocmask");
985
859
_exit(EXIT_FAILURE);
986
860
}
987
861
988
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
863
if(ret == -1){
990
864
perror("dup2");
1010
884
/* no return */
1011
885
}
1012
886
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
887
close(pipefd[1]); /* Close unused write end of pipe */
1015
888
free(filename);
1016
889
plugin *new_plugin = getplugin(dirst->d_name);
1017
if(new_plugin == NULL){
890
if (new_plugin == NULL){
1018
891
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
893
if(ret < 0){
1023
894
perror("sigprocmask");
1024
895
}
1031
902
1032
903
/* Unblock SIGCHLD so signal handler can be run if this process
1033
904
has already completed */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
906
if(ret < 0){
1038
907
perror("sigprocmask");
1039
908
exitstatus = EXIT_FAILURE;
1040
909
goto fallback;
1041
910
}
1042
911
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
912
FD_SET(new_plugin->fd, &rfds_all);
1045
913
1046
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1047
915
maxfd = new_plugin->fd;
1048
916
}
917
1049
918
}
1050
919
1051
TEMP_FAILURE_RETRY(closedir(dir));
920
closedir(dir);
1052
921
dir = NULL;
1053
free_plugin(getplugin(NULL));
1054
922
1055
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1056
924
if(p->pid != 0){
1057
925
break;
1062
930
free_plugin_list();
1063
931
}
1064
932
}
1065
933
1066
934
/* Main loop while running plugins exist */
1067
935
while(plugin_list){
1068
936
fd_set rfds = rfds_all;
1069
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
if(select_ret == -1 and errno != EINTR){
938
if (select_ret == -1){
1071
939
perror("select");
1072
940
exitstatus = EXIT_FAILURE;
1073
941
goto fallback;
1074
942
}
1075
943
/* OK, now either a process completed, or something can be read
1076
944
from one of them */
1077
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1078
946
/* Is this process completely done? */
1079
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1080
948
/* Only accept the plugin output if it exited cleanly */
1081
949
if(not WIFEXITED(proc->status)
1082
950
or WEXITSTATUS(proc->status) != 0){
1083
951
/* Bad exit by plugin */
1084
952
1085
953
if(debug){
1086
954
if(WIFEXITED(proc->status)){
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1090
957
WEXITSTATUS(proc->status));
1091
} else if(WIFSIGNALED(proc->status)){
1092
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
1094
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
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));
1097
962
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1100
965
}
1101
966
}
1102
967
1103
968
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
969
FD_CLR(proc->fd, &rfds_all);
970
1107
971
/* Block signal while modifying process_list */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1112
973
if(ret < 0){
1113
974
perror("sigprocmask");
1114
975
exitstatus = EXIT_FAILURE;
1115
976
goto fallback;
1116
977
}
1117
1118
plugin *next_plugin = proc->next;
1119
978
free_plugin(proc);
1120
proc = next_plugin;
1121
1122
979
/* 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)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1126
982
if(ret < 0){
1127
983
perror("sigprocmask");
1128
984
exitstatus = EXIT_FAILURE;
1132
988
if(plugin_list == NULL){
1133
989
break;
1134
990
}
1135
1136
991
continue;
1137
992
}
1138
993
1139
994
/* This process exited nicely, so print its buffer */
1140
995
1141
996
bool bret = print_out_password(proc->buffer,
1142
997
proc->buffer_length);
1143
998
if(not bret){
1148
1003
}
1149
1004
1150
1005
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1007
/* This process had nothing to say at this time */
1155
proc = proc->next;
1156
1008
continue;
1157
1009
}
1158
1010
/* Before reading, make the process' data buffer large enough */
1159
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
1013
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1014
if (proc->buffer == NULL){
1163
1015
perror("malloc");
1164
1016
exitstatus = EXIT_FAILURE;
1165
1017
goto fallback;
1167
1019
proc->buffer_size += BUFFER_SIZE;
1168
1020
}
1169
1021
/* Read from the process */
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1174
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1175
1025
/* Read error from this process; ignore the error */
1176
proc = proc->next;
1177
1026
continue;
1178
1027
}
1179
if(sret == 0){
1028
if(ret == 0){
1180
1029
/* got EOF */
1181
1030
proc->eof = true;
1182
1031
} else {
1183
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1184
1033
}
1185
1034
}
1186
1035
}
1187
1188
1036
1037
1189
1038
fallback:
1190
1039
1191
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1043
bool bret;
1195
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1196
1045
char *passwordbuffer = getpass("Password: ");
1197
size_t len = strlen(passwordbuffer);
1198
/* Strip trailing newline */
1199
if(len > 0 and passwordbuffer[len-1] == '\n'){
1200
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1201
len--;
1202
}
1203
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1204
1047
if(not bret){
1205
1048
perror("print_out_password");
1206
1049
exitstatus = EXIT_FAILURE;
1213
1056
perror("sigaction");
1214
1057
exitstatus = EXIT_FAILURE;
1215
1058
}
1216
1059
1217
1060
if(custom_argv != NULL){
1218
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1219
1062
free(*arg);
1225
1068
closedir(dir);
1226
1069
}
1227
1070
1228
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1229
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1230
1073
if(p->pid != 0){
1231
1074
close(p->fd);
1238
1081
}
1239
1082
1240
1083
/* Wait for any remaining child processes to terminate */
1241
do {
1084
do{
1242
1085
ret = wait(NULL);
1243
1086
} while(ret >= 0);
1244
1087
if(errno != ECHILD){
1245
1088
perror("wait");
1246
1089
}
1247
1090
1248
1091
free_plugin_list();
1249
1092
1250
1093
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0