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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 309.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- 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){
226
int old_errno = errno;
208
227
while(true){
209
process *proc = process_list;
228
plugin *proc = plugin_list;
210
229
int status;
211
230
pid_t pid = waitpid(-1, &status, WNOHANG);
212
231
if(pid == 0){
214
233
break;
215
234
}
216
235
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
219
239
}
220
/* No child processes */
221
break;
240
perror("waitpid");
222
241
}
223
242
224
243
/* A child exited, find it in process_list */
225
244
while(proc != NULL and proc->pid != pid){
226
245
proc = proc->next;
230
249
continue;
231
250
}
232
251
proc->status = status;
233
proc->completed = true;
252
proc->completed = 1;
234
253
}
254
errno = old_errno;
235
255
}
236
256
237
bool print_out_password(const char *buffer, size_t length){
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
238
259
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
260
for(size_t written = 0; written < length; written += (size_t)ret){
243
261
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
262
length - written));
249
267
return true;
250
268
}
251
269
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);
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);
264
303
}
265
304
}
266
305
273
312
struct dirent *dirst;
274
313
struct stat st;
275
314
fd_set rfds_all;
276
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
277
318
uid_t uid = 65534;
278
319
gid_t gid = 65534;
279
320
bool debug = false;
304
345
{ .name = "global-options", .key = 'g',
305
346
.arg = "OPTION[,OPTION[,...]]",
306
347
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
348
{ .name = "global-env", .key = 'G',
308
349
.arg = "VAR=value",
309
350
.doc = "Environment variable passed to all plugins" },
310
351
{ .name = "options-for", .key = 'o',
311
352
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
353
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
354
{ .name = "env-for", .key = 'E',
314
355
.arg = "PLUGIN:ENV=value",
315
356
.doc = "Environment variable passed to specified plugin" },
316
357
{ .name = "disable", .key = 'd',
317
358
.arg = "PLUGIN",
318
359
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
319
363
{ .name = "plugin-dir", .key = 128,
320
364
.arg = "DIRECTORY",
321
365
.doc = "Specify a different plugin directory", .group = 2 },
333
377
{ .name = NULL }
334
378
};
335
379
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){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
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){
385
char *plugin_option;
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
346
388
continue;
347
389
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
390
if(not add_argument(getplugin(NULL), plugin_option)){
349
391
perror("add_argument");
350
392
return ARGP_ERR_UNKNOWN;
351
393
}
352
394
}
353
395
}
354
396
break;
355
case 'e':
397
case 'G': /* --global-env */
356
398
if(arg == NULL){
357
399
break;
358
400
}
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
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
367
403
}
368
404
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
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
}
405
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
409
break;
410
}
411
char *plugin_option;
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
389
416
}
390
417
}
391
418
}
392
419
break;
393
case 'f':
420
case 'E': /* --env-for */
394
421
if(arg == NULL){
395
422
break;
396
423
}
399
426
if(envdef == NULL){
400
427
break;
401
428
}
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)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
408
431
perror("add_environment");
409
432
}
410
433
}
411
434
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
435
case 'd': /* --disable */
436
if(arg != NULL){
437
plugin *p = getplugin(arg);
415
438
if(p == NULL){
416
439
return ARGP_ERR_UNKNOWN;
417
440
}
418
441
p->disabled = true;
419
442
}
420
443
break;
421
case 128:
444
case 'e': /* --enable */
445
if(arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
422
455
plugindir = strdup(arg);
423
456
if(plugindir == NULL){
424
457
perror("strdup");
425
458
}
426
459
break;
427
case 129:
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
} else {
470
uid = (uid_t)tmpmax;
471
}
472
break;
473
case 131: /* --groupid */
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
479
} else {
480
gid = (gid_t)tmpmax;
481
}
482
break;
483
case 132: /* --debug */
484
debug = true;
485
break;
486
/*
487
* When adding more options before this line, remember to also add a
488
* "case" to the "parse_opt_config_file" function below.
489
*/
490
case ARGP_KEY_ARG:
491
/* Cryptsetup always passes an argument, which is an empty
492
string if "none" was specified in /etc/crypttab. So if
493
argument was empty, we ignore it silently. */
494
if(arg[0] != '\0'){
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
496
}
497
break;
498
case ARGP_KEY_END:
499
break;
500
default:
501
return ARGP_ERR_UNKNOWN;
502
}
503
return 0;
504
}
505
506
/* This option parser is the same as parse_opt() above, except it
507
ignores everything but the --config-file option. */
508
error_t parse_opt_config_file(int key, char *arg,
509
__attribute__((unused))
510
struct argp_state *state){
511
switch(key){
512
case 'g': /* --global-options */
513
case 'G': /* --global-env */
514
case 'o': /* --options-for */
515
case 'E': /* --env-for */
516
case 'd': /* --disable */
517
case 'e': /* --enable */
518
case 128: /* --plugin-dir */
519
break;
520
case 129: /* --config-file */
521
free(argfile);
428
522
argfile = strdup(arg);
429
523
if(argfile == NULL){
430
524
perror("strdup");
431
525
}
432
526
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;
527
case 130: /* --userid */
528
case 131: /* --groupid */
529
case 132: /* --debug */
442
530
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
531
case ARGP_KEY_END:
446
532
break;
447
533
default:
450
536
return 0;
451
537
}
452
538
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
539
struct argp argp = { .options = options,
540
.parser = parse_opt_config_file,
541
.args_doc = "",
457
542
.doc = "Mandos plugin runner -- Run plugins" };
458
543
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
544
/* Parse using parse_opt_config_file() in order to get the custom
545
config file location, if any. */
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
461
548
fprintf(stderr, "Unknown error while parsing arguments\n");
462
549
exitstatus = EXIT_FAILURE;
463
550
goto fallback;
464
551
}
465
466
if (argfile == NULL){
552
553
/* Reset to the normal argument parser */
554
argp.parser = parse_opt;
555
556
/* Open the configfile if available */
557
if(argfile == NULL){
467
558
conffp = fopen(AFILE, "r");
468
559
} else {
469
560
conffp = fopen(argfile, "r");
470
}
471
561
}
472
562
if(conffp != NULL){
473
563
char *org_line = NULL;
474
564
char *p, *arg, *new_arg, *line;
475
565
size_t size = 0;
476
ssize_t sret;
477
566
const char whitespace_delims[] = " \r\t\f\v\n";
478
567
const char comment_delim[] = "#";
479
568
486
575
}
487
576
custom_argv[0] = argv[0];
488
577
custom_argv[1] = NULL;
489
578
579
/* for each line in the config file, strip whitespace and ignore
580
commented text */
490
581
while(true){
491
582
sret = getline(&org_line, &size, conffp);
492
583
if(sret == -1){
521
612
}
522
613
}
523
614
free(org_line);
524
} else{
615
} else {
525
616
/* Check for harmful errors and go to fallback. Other errors might
526
617
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
619
perror("fopen");
529
620
exitstatus = EXIT_FAILURE;
530
621
goto fallback;
531
622
}
532
623
}
533
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
534
626
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
628
0, NULL);
629
if(ret == ARGP_ERR_UNKNOWN){
537
630
fprintf(stderr, "Unknown error while parsing arguments\n");
538
631
exitstatus = EXIT_FAILURE;
539
632
goto fallback;
540
633
}
541
634
}
542
635
636
/* Parse actual command line arguments, to let them override the
637
config file */
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
642
goto fallback;
643
}
644
543
645
if(debug){
544
646
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
647
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
649
for(char **a = p->argv; *a != NULL; a++){
548
650
fprintf(stderr, "\tArg: %s\n", *a);
549
651
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
652
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
653
for(char **a = p->environ; *a != NULL; a++){
552
654
fprintf(stderr, "\t%s\n", *a);
553
655
}
554
656
}
555
657
}
556
658
659
/* Strip permissions down to nobody */
660
setgid(gid);
661
if(ret == -1){
662
perror("setgid");
663
}
557
664
ret = setuid(uid);
558
if (ret == -1){
665
if(ret == -1){
559
666
perror("setuid");
560
667
}
561
668
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
669
if(plugindir == NULL){
568
670
dir = opendir(PDIR);
569
671
} else {
570
672
dir = opendir(plugindir);
591
693
592
694
FD_ZERO(&rfds_all);
593
695
696
/* Read and execute any executable in the plugin directory*/
594
697
while(true){
595
698
dirst = readdir(dir);
596
699
597
// All directory entries have been processed
700
/* All directory entries have been processed */
598
701
if(dirst == NULL){
599
if (errno == EBADF){
702
if(errno == EBADF){
600
703
perror("readdir");
601
704
exitstatus = EXIT_FAILURE;
602
705
goto fallback;
606
709
607
710
d_name_len = strlen(dirst->d_name);
608
711
609
// Ignore dotfiles, backup files and other junk
712
/* Ignore dotfiles, backup files and other junk */
610
713
{
611
714
bool bad_name = false;
612
715
614
717
615
718
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
719
".dpkg-old",
720
".dpkg-bak",
617
721
".dpkg-divert", NULL };
618
722
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
723
size_t pre_len = strlen(*pre);
627
731
break;
628
732
}
629
733
}
630
631
734
if(bad_name){
632
735
continue;
633
736
}
634
635
737
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
738
size_t suf_len = strlen(*suf);
637
739
if((d_name_len >= suf_len)
652
754
}
653
755
654
756
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
757
if(plugindir == NULL){
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
759
} else {
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
}
656
762
if(ret < 0){
657
763
perror("asprintf");
658
764
continue;
659
765
}
660
766
661
767
ret = stat(filename, &st);
662
if (ret == -1){
768
if(ret == -1){
663
769
perror("stat");
664
770
free(filename);
665
771
continue;
666
772
}
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
773
774
/* Ignore non-executable files */
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
776
if(debug){
670
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
778
" with bad type or mode\n", filename);
673
780
free(filename);
674
781
continue;
675
782
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
783
784
plugin *p = getplugin(dirst->d_name);
677
785
if(p == NULL){
678
786
perror("getplugin");
679
787
free(filename);
689
797
}
690
798
{
691
799
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
800
plugin *g = getplugin(NULL);
693
801
if(g != NULL){
694
802
for(char **a = g->argv + 1; *a != NULL; a++){
695
803
if(not add_argument(p, *a)){
698
806
}
699
807
/* Add global environment variables */
700
808
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
809
if(not add_environment(p, *e, false)){
702
810
perror("add_environment");
703
811
}
704
812
}
709
817
process, too. */
710
818
if(p->environ[0] != NULL){
711
819
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)){
820
if(not add_environment(p, *e, false)){
718
821
perror("add_environment");
719
822
}
720
823
}
722
825
723
826
int pipefd[2];
724
827
ret = pipe(pipefd);
725
if (ret == -1){
828
if(ret == -1){
726
829
perror("pipe");
727
830
exitstatus = EXIT_FAILURE;
728
831
goto fallback;
729
832
}
833
/* Ask OS to automatic close the pipe on exec */
730
834
ret = set_cloexec_flag(pipefd[0]);
731
835
if(ret < 0){
732
836
perror("set_cloexec_flag");
740
844
goto fallback;
741
845
}
742
846
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
744
848
if(ret < 0){
745
849
perror("sigprocmask");
746
850
exitstatus = EXIT_FAILURE;
747
851
goto fallback;
748
852
}
749
// Starting a new process to be watched
853
/* Starting a new process to be watched */
750
854
pid_t pid = fork();
751
855
if(pid == -1){
752
856
perror("fork");
760
864
perror("sigaction");
761
865
_exit(EXIT_FAILURE);
762
866
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
868
if(ret < 0){
765
869
perror("sigprocmask");
766
870
_exit(EXIT_FAILURE);
767
871
}
768
872
769
873
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
874
if(ret == -1){
771
875
perror("dup2");
790
894
}
791
895
/* no return */
792
896
}
793
/* parent process */
897
/* Parent process */
898
close(pipefd[1]); /* Close unused write end of pipe */
794
899
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);
900
plugin *new_plugin = getplugin(dirst->d_name);
901
if(new_plugin == NULL){
902
perror("getplugin");
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
904
if(ret < 0){
801
perror("sigprocmask");
905
perror("sigprocmask");
802
906
}
803
907
exitstatus = EXIT_FAILURE;
804
908
goto fallback;
805
909
}
806
910
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
911
new_plugin->pid = pid;
912
new_plugin->fd = pipefd[0];
913
812
914
/* Unblock SIGCHLD so signal handler can be run if this process
813
915
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
815
917
if(ret < 0){
816
918
perror("sigprocmask");
817
919
exitstatus = EXIT_FAILURE;
818
920
goto fallback;
819
921
}
820
922
821
FD_SET(new_process->fd, &rfds_all);
923
FD_SET(new_plugin->fd, &rfds_all);
822
924
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
925
if(maxfd < new_plugin->fd){
926
maxfd = new_plugin->fd;
825
927
}
826
827
928
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
929
832
930
closedir(dir);
833
931
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
932
free_plugin(getplugin(NULL));
933
934
for(plugin *p = plugin_list; p != NULL; p = p->next){
935
if(p->pid != 0){
936
break;
937
}
938
if(p->next == NULL){
939
fprintf(stderr, "No plugin processes started. Incorrect plugin"
940
" directory?\n");
941
free_plugin_list();
942
}
839
943
}
840
while(process_list){
944
945
/* Main loop while running plugins exist */
946
while(plugin_list){
841
947
fd_set rfds = rfds_all;
842
948
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
949
if(select_ret == -1){
844
950
perror("select");
845
951
exitstatus = EXIT_FAILURE;
846
952
goto fallback;
847
953
}
848
954
/* OK, now either a process completed, or something can be read
849
955
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
956
for(plugin *proc = plugin_list; proc != NULL;){
851
957
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
958
if(proc->completed and proc->eof){
853
959
/* Only accept the plugin output if it exited cleanly */
854
960
if(not WIFEXITED(proc->status)
855
961
or WEXITSTATUS(proc->status) != 0){
856
962
/* Bad exit by plugin */
963
857
964
if(debug){
858
965
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
967
" status %d\n", proc->name,
968
(intmax_t) (proc->pid),
861
969
WEXITSTATUS(proc->status));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
970
} else if(WIFSIGNALED(proc->status)){
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
973
(intmax_t) (proc->pid),
865
974
WTERMSIG(proc->status));
866
975
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
" core\n", proc->name, (intmax_t) (proc->pid));
869
978
}
870
979
}
980
871
981
/* Remove the plugin */
872
982
FD_CLR(proc->fd, &rfds_all);
983
873
984
/* Block signal while modifying process_list */
874
985
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
986
if(ret < 0){
877
988
exitstatus = EXIT_FAILURE;
878
989
goto fallback;
879
990
}
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
}
991
992
plugin *next_plugin = proc->next;
993
free_plugin(proc);
994
proc = next_plugin;
995
893
996
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
998
NULL);
896
999
if(ret < 0){
897
1000
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;
1001
exitstatus = EXIT_FAILURE;
1002
goto fallback;
1003
}
1004
1005
if(plugin_list == NULL){
1006
break;
1007
}
1008
1009
continue;
905
1010
}
1011
906
1012
/* This process exited nicely, so print its buffer */
907
1013
908
1014
bool bret = print_out_password(proc->buffer,
909
1015
proc->buffer_length);
910
1016
if(not bret){
913
1019
}
914
1020
goto fallback;
915
1021
}
1022
916
1023
/* This process has not completed. Does it have any output? */
917
1024
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1025
/* This process had nothing to say at this time */
1026
proc = proc->next;
919
1027
continue;
920
1028
}
921
1029
/* Before reading, make the process' data buffer large enough */
922
1030
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1031
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1032
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
1033
if(proc->buffer == NULL){
926
1034
perror("malloc");
927
1035
exitstatus = EXIT_FAILURE;
928
1036
goto fallback;
930
1038
proc->buffer_size += BUFFER_SIZE;
931
1039
}
932
1040
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
BUFFER_SIZE);
1043
if(sret < 0){
936
1044
/* Read error from this process; ignore the error */
1045
proc = proc->next;
937
1046
continue;
938
1047
}
939
if(ret == 0){
1048
if(sret == 0){
940
1049
/* got EOF */
941
1050
proc->eof = true;
942
1051
} else {
943
proc->buffer_length += (size_t) ret;
1052
proc->buffer_length += (size_t) sret;
944
1053
}
945
1054
}
946
1055
}
948
1057
949
1058
fallback:
950
1059
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1061
/* Fallback if all plugins failed, none are found or an error
953
1062
occured */
954
1063
bool bret;
955
1064
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1065
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1066
size_t len = strlen(passwordbuffer);
1067
/* Strip trailing newline */
1068
if(len > 0 and passwordbuffer[len-1] == '\n'){
1069
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1070
len--;
1071
}
1072
bret = print_out_password(passwordbuffer, len);
958
1073
if(not bret){
959
1074
perror("print_out_password");
960
1075
exitstatus = EXIT_FAILURE;
967
1082
perror("sigaction");
968
1083
exitstatus = EXIT_FAILURE;
969
1084
}
970
1085
971
1086
if(custom_argv != NULL){
972
1087
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1088
free(*arg);
974
1089
}
975
1090
free(custom_argv);
976
1091
}
977
free_plugin_list(plugin_list);
978
1092
979
1093
if(dir != NULL){
980
1094
closedir(dir);
981
1095
}
982
1096
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");
1097
/* Kill the processes */
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1099
if(p->pid != 0){
1100
close(p->fd);
1101
ret = kill(p->pid, SIGTERM);
1102
if(ret == -1 and errno != ESRCH){
1103
/* Set-uid proccesses might not get closed */
1104
perror("kill");
1105
}
991
1106
}
992
free(process_list->buffer);
993
free(process_list);
994
1107
}
995
1108
996
1109
/* Wait for any remaining child processes to terminate */
1000
1113
if(errno != ECHILD){
1001
1114
perror("wait");
1002
1115
}
1003
1116
1117
free_plugin_list();
1118
1004
1119
free(plugindir);
1005
1120
free(argfile);
1006
1121
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0