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- Committer: Björn Påhlsson
- Date: 2008-08-30 19:59:33 UTC
- mfrom: (115 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 132.
- Revision ID: belorn@braxen-20080830195933-mhwfz1uk9ijdda48
merge
- 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
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
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 */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
66
69
67
#define BUFFER_SIZE 256
70
68
71
69
#define PDIR "/lib/mandos/plugins.d"
72
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
71
74
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
75
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
74
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
88
77
89
typedef struct plugin{
78
90
char *name; /* can be NULL or any plugin name */
79
91
char **argv;
81
93
char **environ;
82
94
int envc;
83
95
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile sig_atomic_t completed;
93
int status;
94
96
struct plugin *next;
95
97
} plugin;
96
98
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
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))){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
106
103
return p;
107
104
}
108
105
}
109
106
/* Create a new plugin */
110
107
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
108
if (new_plugin == NULL){
112
109
return NULL;
113
110
}
114
111
char *copy_name = NULL;
115
112
if(name != NULL){
116
113
copy_name = strdup(name);
117
114
if(copy_name == NULL){
118
free(new_plugin);
119
115
return NULL;
120
116
}
121
117
}
122
118
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
127
124
128
125
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
130
127
free(copy_name);
131
128
free(new_plugin);
132
129
return NULL;
133
130
}
134
131
new_plugin->argv[0] = copy_name;
135
132
new_plugin->argv[1] = NULL;
136
133
137
134
new_plugin->environ = malloc(sizeof(char *));
138
135
if(new_plugin->environ == NULL){
139
136
free(copy_name);
142
139
return NULL;
143
140
}
144
141
new_plugin->environ[0] = NULL;
145
146
142
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
148
144
return new_plugin;
149
145
}
150
146
180
176
}
181
177
182
178
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
184
180
if(p == NULL){
185
181
return false;
186
182
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
183
return add_to_char_array(def, &(p->environ), &(p->envc));
205
184
}
206
185
186
207
187
/*
208
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
189
* Descriptor Flags".
210
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
191
*/
212
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
213
194
int ret = fcntl(fd, F_GETFD, 0);
214
195
/* If reading the flags failed, return error indication now. */
215
196
if(ret < 0){
219
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
201
}
221
202
203
process *process_list = NULL;
222
204
223
205
/* Mark processes as completed when they exit, and save their exit
224
206
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
227
208
while(true){
228
plugin *proc = plugin_list;
209
process *proc = process_list;
229
210
int status;
230
211
pid_t pid = waitpid(-1, &status, WNOHANG);
231
212
if(pid == 0){
233
214
break;
234
215
}
235
216
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
217
if (errno != ECHILD){
218
perror("waitpid");
239
219
}
240
perror("waitpid");
220
/* No child processes */
221
break;
241
222
}
242
223
243
224
/* A child exited, find it in process_list */
244
225
while(proc != NULL and proc->pid != pid){
245
226
proc = proc->next;
249
230
continue;
250
231
}
251
232
proc->status = status;
252
proc->completed = 1;
233
proc->completed = true;
253
234
}
254
errno = old_errno;
255
235
}
256
236
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
259
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
260
242
for(size_t written = 0; written < length; written += (size_t)ret){
261
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
262
244
length - written));
267
249
return true;
268
250
}
269
251
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
282
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
294
}
295
}
296
297
free(plugin_node);
298
}
299
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
303
264
}
304
265
}
305
266
312
273
struct dirent *dirst;
313
274
struct stat st;
314
275
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
276
int ret, maxfd = 0;
318
277
uid_t uid = 65534;
319
278
gid_t gid = 65534;
320
279
bool debug = false;
345
304
{ .name = "global-options", .key = 'g',
346
305
.arg = "OPTION[,OPTION[,...]]",
347
306
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
349
308
.arg = "VAR=value",
350
309
.doc = "Environment variable passed to all plugins" },
351
310
{ .name = "options-for", .key = 'o',
352
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
312
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
355
314
.arg = "PLUGIN:ENV=value",
356
315
.doc = "Environment variable passed to specified plugin" },
357
316
{ .name = "disable", .key = 'd',
358
317
.arg = "PLUGIN",
359
318
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
363
319
{ .name = "plugin-dir", .key = 128,
364
320
.arg = "DIRECTORY",
365
321
.doc = "Specify a different plugin directory", .group = 2 },
377
333
{ .name = NULL }
378
334
};
379
335
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
385
343
char *p;
386
344
while((p = strsep(&arg, ",")) != NULL){
387
345
if(p[0] == '\0'){
388
346
continue;
389
347
}
390
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
391
349
perror("add_argument");
392
350
return ARGP_ERR_UNKNOWN;
393
351
}
394
352
}
395
353
}
396
354
break;
397
case 'G': /* --global-env */
355
case 'e':
398
356
if(arg == NULL){
399
357
break;
400
358
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
403
367
}
404
368
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
369
case 'o':
370
if (arg != NULL){
407
371
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
409
373
break;
410
374
}
411
375
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
413
377
break;
414
378
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
423
389
}
424
390
}
425
391
}
426
392
break;
427
case 'E': /* --env-for */
393
case 'f':
428
394
if(arg == NULL){
429
395
break;
430
396
}
433
399
if(envdef == NULL){
434
400
break;
435
401
}
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
438
408
perror("add_environment");
439
409
}
440
410
}
441
411
break;
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
445
415
if(p == NULL){
446
416
return ARGP_ERR_UNKNOWN;
447
417
}
448
418
p->disabled = true;
449
419
}
450
420
break;
451
case 'e': /* --enable */
452
if(arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = false;
458
}
459
break;
460
case 128: /* --plugin-dir */
461
free(plugindir);
421
case 128:
462
422
plugindir = strdup(arg);
463
423
if(plugindir == NULL){
464
424
perror("strdup");
465
425
}
466
426
break;
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
469
break;
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
478
}
479
break;
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
488
}
489
break;
490
case 132: /* --debug */
491
debug = true;
492
break;
493
/*
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
496
*/
497
case ARGP_KEY_ARG:
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
default:
508
return ARGP_ERR_UNKNOWN;
509
}
510
return 0;
511
}
512
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
518
switch(key){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
526
break;
527
case 129: /* --config-file */
528
free(argfile);
427
case 129:
529
428
argfile = strdup(arg);
530
429
if(argfile == NULL){
531
430
perror("strdup");
532
431
}
533
432
break;
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
debug = true;
441
break;
537
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
538
445
case ARGP_KEY_END:
539
446
break;
540
447
default:
543
450
return 0;
544
451
}
545
452
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
548
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
549
457
.doc = "Mandos plugin runner -- Run plugins" };
550
458
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
555
461
fprintf(stderr, "Unknown error while parsing arguments\n");
556
462
exitstatus = EXIT_FAILURE;
557
463
goto fallback;
558
464
}
559
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
562
563
/* Open the configfile if available */
564
if(argfile == NULL){
465
466
if (argfile == NULL){
565
467
conffp = fopen(AFILE, "r");
566
468
} else {
567
469
conffp = fopen(argfile, "r");
568
}
470
}
471
569
472
if(conffp != NULL){
570
473
char *org_line = NULL;
571
474
char *p, *arg, *new_arg, *line;
572
475
size_t size = 0;
476
ssize_t sret;
573
477
const char whitespace_delims[] = " \r\t\f\v\n";
574
478
const char comment_delim[] = "#";
575
479
582
486
}
583
487
custom_argv[0] = argv[0];
584
488
custom_argv[1] = NULL;
585
586
/* for each line in the config file, strip whitespace and ignore
587
commented text */
489
588
490
while(true){
589
491
sret = getline(&org_line, &size, conffp);
590
492
if(sret == -1){
619
521
}
620
522
}
621
523
free(org_line);
622
} else {
524
} else{
623
525
/* Check for harmful errors and go to fallback. Other errors might
624
526
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
528
perror("fopen");
627
529
exitstatus = EXIT_FAILURE;
628
530
goto fallback;
629
531
}
630
532
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
533
633
534
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
637
537
fprintf(stderr, "Unknown error while parsing arguments\n");
638
538
exitstatus = EXIT_FAILURE;
639
539
goto fallback;
640
540
}
641
541
}
642
542
643
/* Parse actual command line arguments, to let them override the
644
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
650
}
651
652
543
if(debug){
653
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
654
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
656
547
for(char **a = p->argv; *a != NULL; a++){
657
548
fprintf(stderr, "\tArg: %s\n", *a);
658
549
}
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
660
551
for(char **a = p->environ; *a != NULL; a++){
661
552
fprintf(stderr, "\t%s\n", *a);
662
553
}
663
554
}
664
555
}
665
556
666
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
667
562
setgid(gid);
668
if(ret == -1){
563
if (ret == -1){
669
564
perror("setgid");
670
565
}
671
ret = setuid(uid);
672
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
566
567
if (plugindir == NULL){
677
568
dir = opendir(PDIR);
678
569
} else {
679
570
dir = opendir(plugindir);
700
591
701
592
FD_ZERO(&rfds_all);
702
593
703
/* Read and execute any executable in the plugin directory*/
704
594
while(true){
705
595
dirst = readdir(dir);
706
596
707
/* All directory entries have been processed */
597
// All directory entries have been processed
708
598
if(dirst == NULL){
709
if(errno == EBADF){
599
if (errno == EBADF){
710
600
perror("readdir");
711
601
exitstatus = EXIT_FAILURE;
712
602
goto fallback;
716
606
717
607
d_name_len = strlen(dirst->d_name);
718
608
719
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
720
610
{
721
611
bool bad_name = false;
722
612
724
614
725
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
616
".dpkg-old",
727
".dpkg-bak",
728
617
".dpkg-divert", NULL };
729
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
619
size_t pre_len = strlen(*pre);
738
627
break;
739
628
}
740
629
}
630
741
631
if(bad_name){
742
632
continue;
743
633
}
634
744
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
636
size_t suf_len = strlen(*suf);
746
637
if((d_name_len >= suf_len)
761
652
}
762
653
763
654
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
769
656
if(ret < 0){
770
657
perror("asprintf");
771
658
continue;
772
659
}
773
660
774
661
ret = stat(filename, &st);
775
if(ret == -1){
662
if (ret == -1){
776
663
perror("stat");
777
664
free(filename);
778
665
continue;
779
666
}
780
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
783
669
if(debug){
784
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
671
" with bad type or mode\n", filename);
787
673
free(filename);
788
674
continue;
789
675
}
790
791
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
792
677
if(p == NULL){
793
678
perror("getplugin");
794
679
free(filename);
804
689
}
805
690
{
806
691
/* Add global arguments to argument list for this plugin */
807
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
808
693
if(g != NULL){
809
694
for(char **a = g->argv + 1; *a != NULL; a++){
810
695
if(not add_argument(p, *a)){
813
698
}
814
699
/* Add global environment variables */
815
700
for(char **e = g->environ; *e != NULL; e++){
816
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
817
702
perror("add_environment");
818
703
}
819
704
}
824
709
process, too. */
825
710
if(p->environ[0] != NULL){
826
711
for(char **e = environ; *e != NULL; e++){
827
if(not add_environment(p, *e, false)){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
828
718
perror("add_environment");
829
719
}
830
720
}
832
722
833
723
int pipefd[2];
834
724
ret = pipe(pipefd);
835
if(ret == -1){
725
if (ret == -1){
836
726
perror("pipe");
837
727
exitstatus = EXIT_FAILURE;
838
728
goto fallback;
839
729
}
840
/* Ask OS to automatic close the pipe on exec */
841
730
ret = set_cloexec_flag(pipefd[0]);
842
731
if(ret < 0){
843
732
perror("set_cloexec_flag");
851
740
goto fallback;
852
741
}
853
742
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
855
744
if(ret < 0){
856
745
perror("sigprocmask");
857
746
exitstatus = EXIT_FAILURE;
858
747
goto fallback;
859
748
}
860
/* Starting a new process to be watched */
749
// Starting a new process to be watched
861
750
pid_t pid = fork();
862
751
if(pid == -1){
863
752
perror("fork");
871
760
perror("sigaction");
872
761
_exit(EXIT_FAILURE);
873
762
}
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
764
if(ret < 0){
876
765
perror("sigprocmask");
877
766
_exit(EXIT_FAILURE);
878
767
}
879
768
880
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
770
if(ret == -1){
882
771
perror("dup2");
901
790
}
902
791
/* no return */
903
792
}
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
906
794
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
800
if(ret < 0){
912
perror("sigprocmask");
801
perror("sigprocmask");
913
802
}
914
803
exitstatus = EXIT_FAILURE;
915
804
goto fallback;
916
805
}
917
806
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
921
812
/* Unblock SIGCHLD so signal handler can be run if this process
922
813
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
924
815
if(ret < 0){
925
816
perror("sigprocmask");
926
817
exitstatus = EXIT_FAILURE;
927
818
goto fallback;
928
819
}
929
820
930
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
931
822
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
934
825
}
826
935
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
936
831
937
832
closedir(dir);
938
833
dir = NULL;
939
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
949
839
}
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
840
while(process_list){
953
841
fd_set rfds = rfds_all;
954
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
843
if (select_ret == -1){
956
844
perror("select");
957
845
exitstatus = EXIT_FAILURE;
958
846
goto fallback;
959
847
}
960
848
/* OK, now either a process completed, or something can be read
961
849
from one of them */
962
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
963
851
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
965
853
/* Only accept the plugin output if it exited cleanly */
966
854
if(not WIFEXITED(proc->status)
967
855
or WEXITSTATUS(proc->status) != 0){
968
856
/* Bad exit by plugin */
969
970
857
if(debug){
971
858
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
975
861
WEXITSTATUS(proc->status));
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
979
(intmax_t) (proc->pid),
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
980
865
WTERMSIG(proc->status));
981
866
} else if(WCOREDUMP(proc->status)){
982
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
984
869
}
985
870
}
986
987
871
/* Remove the plugin */
988
872
FD_CLR(proc->fd, &rfds_all);
989
990
873
/* Block signal while modifying process_list */
991
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
992
875
if(ret < 0){
994
877
exitstatus = EXIT_FAILURE;
995
878
goto fallback;
996
879
}
997
998
plugin *next_plugin = proc->next;
999
free_plugin(proc);
1000
proc = next_plugin;
1001
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
1002
893
/* We are done modifying process list, so unblock signal */
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1005
896
if(ret < 0){
1006
897
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1008
goto fallback;
1009
}
1010
1011
if(plugin_list == NULL){
1012
break;
1013
}
1014
1015
continue;
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1016
905
}
1017
1018
906
/* This process exited nicely, so print its buffer */
1019
907
1020
908
bool bret = print_out_password(proc->buffer,
1021
909
proc->buffer_length);
1022
910
if(not bret){
1025
913
}
1026
914
goto fallback;
1027
915
}
1028
1029
916
/* This process has not completed. Does it have any output? */
1030
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1031
918
/* This process had nothing to say at this time */
1032
proc = proc->next;
1033
919
continue;
1034
920
}
1035
921
/* Before reading, make the process' data buffer large enough */
1036
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1037
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1038
924
+ (size_t) BUFFER_SIZE);
1039
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1040
926
perror("malloc");
1041
927
exitstatus = EXIT_FAILURE;
1042
928
goto fallback;
1044
930
proc->buffer_size += BUFFER_SIZE;
1045
931
}
1046
932
/* Read from the process */
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1049
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1050
936
/* Read error from this process; ignore the error */
1051
proc = proc->next;
1052
937
continue;
1053
938
}
1054
if(sret == 0){
939
if(ret == 0){
1055
940
/* got EOF */
1056
941
proc->eof = true;
1057
942
} else {
1058
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1059
944
}
1060
945
}
1061
946
}
1063
948
1064
949
fallback:
1065
950
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1067
952
/* Fallback if all plugins failed, none are found or an error
1068
953
occured */
1069
954
bool bret;
1070
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1071
956
char *passwordbuffer = getpass("Password: ");
1072
size_t len = strlen(passwordbuffer);
1073
/* Strip trailing newline */
1074
if(len > 0 and passwordbuffer[len-1] == '\n'){
1075
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1076
len--;
1077
}
1078
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1079
958
if(not bret){
1080
959
perror("print_out_password");
1081
960
exitstatus = EXIT_FAILURE;
1088
967
perror("sigaction");
1089
968
exitstatus = EXIT_FAILURE;
1090
969
}
1091
970
1092
971
if(custom_argv != NULL){
1093
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1094
973
free(*arg);
1095
974
}
1096
975
free(custom_argv);
1097
976
}
977
free_plugin_list(plugin_list);
1098
978
1099
979
if(dir != NULL){
1100
980
closedir(dir);
1101
981
}
1102
982
1103
/* Kill the processes */
1104
for(plugin *p = plugin_list; p != NULL; p = p->next){
1105
if(p->pid != 0){
1106
close(p->fd);
1107
ret = kill(p->pid, SIGTERM);
1108
if(ret == -1 and errno != ESRCH){
1109
/* Set-uid proccesses might not get closed */
1110
perror("kill");
1111
}
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1112
991
}
992
free(process_list->buffer);
993
free(process_list);
1113
994
}
1114
995
1115
996
/* Wait for any remaining child processes to terminate */
1119
1000
if(errno != ECHILD){
1120
1001
perror("wait");
1121
1002
}
1122
1123
free_plugin_list();
1124
1003
1125
1004
free(plugindir);
1126
1005
free(argfile);
1127
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0