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- Committer: Teddy Hogeborn
- Date: 2009-02-05 03:15:43 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205031543-cyd3j09i6iut38w1
* plugin-runner.c (struct plugin.status): Changed type to "int".
(main): Check "proc->completed" before "proc->eof", since
"completed" is of type "sig_atomic_t".
(main): Check "proc->completed" before "proc->eof", since
"completed" is of type "sig_atomic_t".
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
70
69
71
#define PDIR "/lib/mandos/plugins.d"
70
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
73
72
const char *argp_program_version = "plugin-runner 1.0";
74
const char *argp_program_version = "plugin-runner " VERSION;
73
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
76
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
89
77
typedef struct plugin{
90
78
char *name; /* can be NULL or any plugin name */
91
79
char **argv;
93
81
char **environ;
94
82
int envc;
95
83
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;
96
94
struct plugin *next;
97
95
} plugin;
98
96
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))){
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))){
103
106
return p;
104
107
}
105
108
}
106
109
/* Create a new plugin */
107
110
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
111
if(new_plugin == NULL){
109
112
return NULL;
110
113
}
111
114
char *copy_name = NULL;
112
115
if(name != NULL){
113
116
copy_name = strdup(name);
114
117
if(copy_name == NULL){
118
free(new_plugin);
115
119
return NULL;
116
120
}
117
121
}
118
122
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
124
127
125
128
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
127
130
free(copy_name);
128
131
free(new_plugin);
129
132
return NULL;
130
133
}
131
134
new_plugin->argv[0] = copy_name;
132
135
new_plugin->argv[1] = NULL;
133
136
134
137
new_plugin->environ = malloc(sizeof(char *));
135
138
if(new_plugin->environ == NULL){
136
139
free(copy_name);
139
142
return NULL;
140
143
}
141
144
new_plugin->environ[0] = NULL;
145
142
146
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
144
148
return new_plugin;
145
149
}
146
150
176
180
}
177
181
178
182
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
180
184
if(p == NULL){
181
185
return false;
182
186
}
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
}
183
204
return add_to_char_array(def, &(p->environ), &(p->envc));
184
205
}
185
206
186
187
207
/*
188
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
209
* Descriptor Flags".
190
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
191
211
*/
192
static int set_cloexec_flag(int fd)
193
{
212
static int set_cloexec_flag(int fd){
194
213
int ret = fcntl(fd, F_GETFD, 0);
195
214
/* If reading the flags failed, return error indication now. */
196
215
if(ret < 0){
200
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
220
}
202
221
203
process *process_list = NULL;
204
222
205
223
/* Mark processes as completed when they exit, and save their exit
206
224
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
225
static void handle_sigchld(__attribute__((unused)) int sig){
208
226
while(true){
209
process *proc = process_list;
227
plugin *proc = plugin_list;
210
228
int status;
211
229
pid_t pid = waitpid(-1, &status, WNOHANG);
212
230
if(pid == 0){
214
232
break;
215
233
}
216
234
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
235
if(errno == ECHILD){
236
/* No child processes */
237
break;
219
238
}
220
/* No child processes */
221
break;
239
perror("waitpid");
222
240
}
223
241
224
242
/* A child exited, find it in process_list */
225
243
while(proc != NULL and proc->pid != pid){
226
244
proc = proc->next;
230
248
continue;
231
249
}
232
250
proc->status = status;
233
proc->completed = true;
251
proc->completed = 1;
234
252
}
235
253
}
236
254
237
bool print_out_password(const char *buffer, size_t length){
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
238
257
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
258
for(size_t written = 0; written < length; written += (size_t)ret){
243
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
260
length - written));
249
265
return true;
250
266
}
251
267
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);
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
264
301
}
265
302
}
266
303
273
310
struct dirent *dirst;
274
311
struct stat st;
275
312
fd_set rfds_all;
276
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
277
316
uid_t uid = 65534;
278
317
gid_t gid = 65534;
279
318
bool debug = false;
304
343
{ .name = "global-options", .key = 'g',
305
344
.arg = "OPTION[,OPTION[,...]]",
306
345
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
346
{ .name = "global-env", .key = 'G',
308
347
.arg = "VAR=value",
309
348
.doc = "Environment variable passed to all plugins" },
310
349
{ .name = "options-for", .key = 'o',
311
350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
351
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
352
{ .name = "env-for", .key = 'E',
314
353
.arg = "PLUGIN:ENV=value",
315
354
.doc = "Environment variable passed to specified plugin" },
316
355
{ .name = "disable", .key = 'd',
317
356
.arg = "PLUGIN",
318
357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
319
361
{ .name = "plugin-dir", .key = 128,
320
362
.arg = "DIRECTORY",
321
363
.doc = "Specify a different plugin directory", .group = 2 },
333
375
{ .name = NULL }
334
376
};
335
377
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){
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state){
380
switch(key){
381
case 'g': /* --global-options */
382
if(arg != NULL){
343
383
char *p;
344
384
while((p = strsep(&arg, ",")) != NULL){
345
385
if(p[0] == '\0'){
346
386
continue;
347
387
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
388
if(not add_argument(getplugin(NULL), p)){
349
389
perror("add_argument");
350
390
return ARGP_ERR_UNKNOWN;
351
391
}
352
392
}
353
393
}
354
394
break;
355
case 'e':
395
case 'G': /* --global-env */
356
396
if(arg == NULL){
357
397
break;
358
398
}
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
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
367
401
}
368
402
break;
369
case 'o':
370
if (arg != NULL){
403
case 'o': /* --options-for */
404
if(arg != NULL){
371
405
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
406
if(p_name[0] == '\0' or arg == NULL){
373
407
break;
374
408
}
375
409
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
410
if(opt[0] == '\0' or opt == NULL){
377
411
break;
378
412
}
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
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
389
421
}
390
422
}
391
423
}
392
424
break;
393
case 'f':
425
case 'E': /* --env-for */
394
426
if(arg == NULL){
395
427
break;
396
428
}
399
431
if(envdef == NULL){
400
432
break;
401
433
}
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)){
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
408
436
perror("add_environment");
409
437
}
410
438
}
411
439
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
415
443
if(p == NULL){
416
444
return ARGP_ERR_UNKNOWN;
417
445
}
418
446
p->disabled = true;
419
447
}
420
448
break;
421
case 128:
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
422
460
plugindir = strdup(arg);
423
461
if(plugindir == NULL){
424
462
perror("strdup");
425
463
}
426
464
break;
427
case 129:
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
case 132: /* --debug */
489
debug = true;
490
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state){
516
switch(key){
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
428
527
argfile = strdup(arg);
429
528
if(argfile == NULL){
430
529
perror("strdup");
431
530
}
432
531
break;
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;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
442
535
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
536
case ARGP_KEY_END:
446
537
break;
447
538
default:
450
541
return 0;
451
542
}
452
543
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.args_doc = "",
457
547
.doc = "Mandos plugin runner -- Run plugins" };
458
548
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
461
553
fprintf(stderr, "Unknown error while parsing arguments\n");
462
554
exitstatus = EXIT_FAILURE;
463
555
goto fallback;
464
556
}
465
466
if (argfile == NULL){
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
467
563
conffp = fopen(AFILE, "r");
468
564
} else {
469
565
conffp = fopen(argfile, "r");
470
}
471
566
}
472
567
if(conffp != NULL){
473
568
char *org_line = NULL;
474
569
char *p, *arg, *new_arg, *line;
475
570
size_t size = 0;
476
ssize_t sret;
477
571
const char whitespace_delims[] = " \r\t\f\v\n";
478
572
const char comment_delim[] = "#";
479
573
486
580
}
487
581
custom_argv[0] = argv[0];
488
582
custom_argv[1] = NULL;
489
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
490
586
while(true){
491
587
sret = getline(&org_line, &size, conffp);
492
588
if(sret == -1){
521
617
}
522
618
}
523
619
free(org_line);
524
} else{
620
} else {
525
621
/* Check for harmful errors and go to fallback. Other errors might
526
622
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
624
perror("fopen");
529
625
exitstatus = EXIT_FAILURE;
530
626
goto fallback;
531
627
}
532
628
}
533
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
534
631
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
537
635
fprintf(stderr, "Unknown error while parsing arguments\n");
538
636
exitstatus = EXIT_FAILURE;
539
637
goto fallback;
540
638
}
541
639
}
542
640
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
543
650
if(debug){
544
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
654
for(char **a = p->argv; *a != NULL; a++){
548
655
fprintf(stderr, "\tArg: %s\n", *a);
549
656
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
658
for(char **a = p->environ; *a != NULL; a++){
552
659
fprintf(stderr, "\t%s\n", *a);
553
660
}
554
661
}
555
662
}
556
663
664
/* Strip permissions down to nobody */
557
665
ret = setuid(uid);
558
if (ret == -1){
666
if(ret == -1){
559
667
perror("setuid");
560
}
561
668
}
562
669
setgid(gid);
563
if (ret == -1){
670
if(ret == -1){
564
671
perror("setgid");
565
672
}
566
567
if (plugindir == NULL){
673
674
if(plugindir == NULL){
568
675
dir = opendir(PDIR);
569
676
} else {
570
677
dir = opendir(plugindir);
591
698
592
699
FD_ZERO(&rfds_all);
593
700
701
/* Read and execute any executable in the plugin directory*/
594
702
while(true){
595
703
dirst = readdir(dir);
596
704
597
// All directory entries have been processed
705
/* All directory entries have been processed */
598
706
if(dirst == NULL){
599
if (errno == EBADF){
707
if(errno == EBADF){
600
708
perror("readdir");
601
709
exitstatus = EXIT_FAILURE;
602
710
goto fallback;
606
714
607
715
d_name_len = strlen(dirst->d_name);
608
716
609
// Ignore dotfiles, backup files and other junk
717
/* Ignore dotfiles, backup files and other junk */
610
718
{
611
719
bool bad_name = false;
612
720
614
722
615
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
724
".dpkg-old",
725
".dpkg-bak",
617
726
".dpkg-divert", NULL };
618
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
728
size_t pre_len = strlen(*pre);
627
736
break;
628
737
}
629
738
}
630
631
739
if(bad_name){
632
740
continue;
633
741
}
634
635
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
743
size_t suf_len = strlen(*suf);
637
744
if((d_name_len >= suf_len)
652
759
}
653
760
654
761
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
656
767
if(ret < 0){
657
768
perror("asprintf");
658
769
continue;
659
770
}
660
771
661
772
ret = stat(filename, &st);
662
if (ret == -1){
773
if(ret == -1){
663
774
perror("stat");
664
775
free(filename);
665
776
continue;
666
777
}
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
781
if(debug){
670
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
783
" with bad type or mode\n", filename);
673
785
free(filename);
674
786
continue;
675
787
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
788
789
plugin *p = getplugin(dirst->d_name);
677
790
if(p == NULL){
678
791
perror("getplugin");
679
792
free(filename);
689
802
}
690
803
{
691
804
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
805
plugin *g = getplugin(NULL);
693
806
if(g != NULL){
694
807
for(char **a = g->argv + 1; *a != NULL; a++){
695
808
if(not add_argument(p, *a)){
698
811
}
699
812
/* Add global environment variables */
700
813
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
814
if(not add_environment(p, *e, false)){
702
815
perror("add_environment");
703
816
}
704
817
}
709
822
process, too. */
710
823
if(p->environ[0] != NULL){
711
824
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
825
if(not add_environment(p, *e, false)){
718
826
perror("add_environment");
719
827
}
720
828
}
722
830
723
831
int pipefd[2];
724
832
ret = pipe(pipefd);
725
if (ret == -1){
833
if(ret == -1){
726
834
perror("pipe");
727
835
exitstatus = EXIT_FAILURE;
728
836
goto fallback;
729
837
}
838
/* Ask OS to automatic close the pipe on exec */
730
839
ret = set_cloexec_flag(pipefd[0]);
731
840
if(ret < 0){
732
841
perror("set_cloexec_flag");
740
849
goto fallback;
741
850
}
742
851
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
744
853
if(ret < 0){
745
854
perror("sigprocmask");
746
855
exitstatus = EXIT_FAILURE;
747
856
goto fallback;
748
857
}
749
// Starting a new process to be watched
858
/* Starting a new process to be watched */
750
859
pid_t pid = fork();
751
860
if(pid == -1){
752
861
perror("fork");
760
869
perror("sigaction");
761
870
_exit(EXIT_FAILURE);
762
871
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
873
if(ret < 0){
765
874
perror("sigprocmask");
766
875
_exit(EXIT_FAILURE);
767
876
}
768
877
769
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
879
if(ret == -1){
771
880
perror("dup2");
790
899
}
791
900
/* no return */
792
901
}
793
/* parent process */
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
794
904
free(filename);
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);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
909
if(ret < 0){
801
perror("sigprocmask");
910
perror("sigprocmask");
802
911
}
803
912
exitstatus = EXIT_FAILURE;
804
913
goto fallback;
805
914
}
806
915
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
812
919
/* Unblock SIGCHLD so signal handler can be run if this process
813
920
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
815
922
if(ret < 0){
816
923
perror("sigprocmask");
817
924
exitstatus = EXIT_FAILURE;
818
925
goto fallback;
819
926
}
820
927
821
FD_SET(new_process->fd, &rfds_all);
928
FD_SET(new_plugin->fd, &rfds_all);
822
929
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
825
932
}
826
827
933
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
934
832
935
closedir(dir);
833
936
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
839
947
}
840
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
841
951
fd_set rfds = rfds_all;
842
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
953
if(select_ret == -1){
844
954
perror("select");
845
955
exitstatus = EXIT_FAILURE;
846
956
goto fallback;
847
957
}
848
958
/* OK, now either a process completed, or something can be read
849
959
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
851
961
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
853
963
/* Only accept the plugin output if it exited cleanly */
854
964
if(not WIFEXITED(proc->status)
855
965
or WEXITSTATUS(proc->status) != 0){
856
966
/* Bad exit by plugin */
967
857
968
if(debug){
858
969
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
861
972
WEXITSTATUS(proc->status));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
973
} else if(WIFSIGNALED(proc->status)){
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
865
976
WTERMSIG(proc->status));
866
977
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
869
980
}
870
981
}
982
871
983
/* Remove the plugin */
872
984
FD_CLR(proc->fd, &rfds_all);
985
873
986
/* Block signal while modifying process_list */
874
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
988
if(ret < 0){
877
990
exitstatus = EXIT_FAILURE;
878
991
goto fallback;
879
992
}
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
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
893
998
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
896
1001
if(ret < 0){
897
1002
perror("sigprocmask");
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;
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
905
1012
}
1013
906
1014
/* This process exited nicely, so print its buffer */
907
1015
908
1016
bool bret = print_out_password(proc->buffer,
909
1017
proc->buffer_length);
910
1018
if(not bret){
913
1021
}
914
1022
goto fallback;
915
1023
}
1024
916
1025
/* This process has not completed. Does it have any output? */
917
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1027
/* This process had nothing to say at this time */
1028
proc = proc->next;
919
1029
continue;
920
1030
}
921
1031
/* Before reading, make the process' data buffer large enough */
922
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1034
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
1035
if(proc->buffer == NULL){
926
1036
perror("malloc");
927
1037
exitstatus = EXIT_FAILURE;
928
1038
goto fallback;
930
1040
proc->buffer_size += BUFFER_SIZE;
931
1041
}
932
1042
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
936
1046
/* Read error from this process; ignore the error */
1047
proc = proc->next;
937
1048
continue;
938
1049
}
939
if(ret == 0){
1050
if(sret == 0){
940
1051
/* got EOF */
941
1052
proc->eof = true;
942
1053
} else {
943
proc->buffer_length += (size_t) ret;
1054
proc->buffer_length += (size_t) sret;
944
1055
}
945
1056
}
946
1057
}
948
1059
949
1060
fallback:
950
1061
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1063
/* Fallback if all plugins failed, none are found or an error
953
1064
occured */
954
1065
bool bret;
955
1066
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1067
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
958
1075
if(not bret){
959
1076
perror("print_out_password");
960
1077
exitstatus = EXIT_FAILURE;
967
1084
perror("sigaction");
968
1085
exitstatus = EXIT_FAILURE;
969
1086
}
970
1087
971
1088
if(custom_argv != NULL){
972
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1090
free(*arg);
974
1091
}
975
1092
free(custom_argv);
976
1093
}
977
free_plugin_list(plugin_list);
978
1094
979
1095
if(dir != NULL){
980
1096
closedir(dir);
981
1097
}
982
1098
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");
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
991
1108
}
992
free(process_list->buffer);
993
free(process_list);
994
1109
}
995
1110
996
1111
/* Wait for any remaining child processes to terminate */
1000
1115
if(errno != ECHILD){
1001
1116
perror("wait");
1002
1117
}
1003
1118
1119
free_plugin_list();
1120
1004
1121
free(plugindir);
1005
1122
free(argfile);
1006
1123
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0