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- Committer: Teddy Hogeborn
- Date: 2008-08-29 07:14:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20080829071439-feg1el14hx1abvqg
* mandos-keygen.xml (EXAMPLE): Replaced all occurrences of command
name with "&COMMANDNAME;".
* plugin-runner.xml (EXAMPLES): Renamed to "EXAMPLE". - '' -
name with "&COMMANDNAME;".
* plugin-runner.xml (EXAMPLES): Renamed to "EXAMPLE". - '' -
- 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,
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
SIG_UNBLOCK, kill() */
67
65
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
69
66
70
67
#define BUFFER_SIZE 256
71
68
72
69
#define PDIR "/lib/mandos/plugins.d"
73
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
71
75
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
76
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
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
78
89
typedef struct plugin{
79
90
char *name; /* can be NULL or any plugin name */
80
91
char **argv;
82
93
char **environ;
83
94
int envc;
84
95
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
95
96
struct plugin *next;
96
97
} plugin;
97
98
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
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))){
107
103
return p;
108
104
}
109
105
}
110
106
/* Create a new plugin */
111
107
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
108
if (new_plugin == NULL){
113
109
return NULL;
114
110
}
115
111
char *copy_name = NULL;
116
112
if(name != NULL){
117
113
copy_name = strdup(name);
118
114
if(copy_name == NULL){
119
free(new_plugin);
120
115
return NULL;
121
116
}
122
117
}
123
118
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
128
124
129
125
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
131
127
free(copy_name);
132
128
free(new_plugin);
133
129
return NULL;
134
130
}
135
131
new_plugin->argv[0] = copy_name;
136
132
new_plugin->argv[1] = NULL;
137
133
138
134
new_plugin->environ = malloc(sizeof(char *));
139
135
if(new_plugin->environ == NULL){
140
136
free(copy_name);
143
139
return NULL;
144
140
}
145
141
new_plugin->environ[0] = NULL;
146
147
142
/* Append the new plugin to the list */
148
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
149
144
return new_plugin;
150
145
}
151
146
181
176
}
182
177
183
178
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
185
180
if(p == NULL){
186
181
return false;
187
182
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
205
183
return add_to_char_array(def, &(p->environ), &(p->envc));
206
184
}
207
185
186
208
187
/*
209
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
189
* Descriptor Flags".
211
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
191
*/
213
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
214
194
int ret = fcntl(fd, F_GETFD, 0);
215
195
/* If reading the flags failed, return error indication now. */
216
196
if(ret < 0){
220
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
221
201
}
222
202
203
process *process_list = NULL;
223
204
224
205
/* Mark processes as completed when they exit, and save their exit
225
206
status. */
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
228
208
while(true){
229
plugin *proc = plugin_list;
209
process *proc = process_list;
230
210
int status;
231
211
pid_t pid = waitpid(-1, &status, WNOHANG);
232
212
if(pid == 0){
234
214
break;
235
215
}
236
216
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
217
if (errno != ECHILD){
218
perror("waitpid");
240
219
}
241
perror("waitpid");
220
/* No child processes */
221
break;
242
222
}
243
223
244
224
/* A child exited, find it in process_list */
245
225
while(proc != NULL and proc->pid != pid){
246
226
proc = proc->next;
250
230
continue;
251
231
}
252
232
proc->status = status;
253
proc->completed = 1;
233
proc->completed = true;
254
234
}
255
errno = old_errno;
256
235
}
257
236
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
260
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
261
242
for(size_t written = 0; written < length; written += (size_t)ret){
262
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
244
length - written));
268
249
return true;
269
250
}
270
251
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
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);
304
264
}
305
265
}
306
266
313
273
struct dirent *dirst;
314
274
struct stat st;
315
275
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
276
int ret, maxfd = 0;
319
277
uid_t uid = 65534;
320
278
gid_t gid = 65534;
321
279
bool debug = false;
346
304
{ .name = "global-options", .key = 'g',
347
305
.arg = "OPTION[,OPTION[,...]]",
348
306
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
350
308
.arg = "VAR=value",
351
309
.doc = "Environment variable passed to all plugins" },
352
310
{ .name = "options-for", .key = 'o',
353
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
354
312
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
356
314
.arg = "PLUGIN:ENV=value",
357
315
.doc = "Environment variable passed to specified plugin" },
358
316
{ .name = "disable", .key = 'd',
359
317
.arg = "PLUGIN",
360
318
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
364
319
{ .name = "plugin-dir", .key = 128,
365
320
.arg = "DIRECTORY",
366
321
.doc = "Specify a different plugin directory", .group = 2 },
378
333
{ .name = NULL }
379
334
};
380
335
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
switch(key){
384
case 'g': /* --global-options */
385
if(arg != NULL){
386
char *plugin_option;
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
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'){
389
346
continue;
390
347
}
391
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
392
349
perror("add_argument");
393
350
return ARGP_ERR_UNKNOWN;
394
351
}
395
352
}
396
353
}
397
354
break;
398
case 'G': /* --global-env */
355
case 'e':
399
356
if(arg == NULL){
400
357
break;
401
358
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
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
}
404
367
}
405
368
break;
406
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
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
}
417
389
}
418
390
}
419
391
}
420
392
break;
421
case 'E': /* --env-for */
393
case 'f':
422
394
if(arg == NULL){
423
395
break;
424
396
}
427
399
if(envdef == NULL){
428
400
break;
429
401
}
430
*envdef = '\0';
431
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)){
432
408
perror("add_environment");
433
409
}
434
410
}
435
411
break;
436
case 'd': /* --disable */
437
if(arg != NULL){
438
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
439
415
if(p == NULL){
440
416
return ARGP_ERR_UNKNOWN;
441
417
}
442
418
p->disabled = true;
443
419
}
444
420
break;
445
case 'e': /* --enable */
446
if(arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
421
case 128:
456
422
plugindir = strdup(arg);
457
423
if(plugindir == NULL){
458
424
perror("strdup");
459
425
}
460
426
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
472
}
473
break;
474
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
482
}
483
break;
484
case 132: /* --debug */
485
debug = true;
486
break;
487
/*
488
* When adding more options before this line, remember to also add a
489
* "case" to the "parse_opt_config_file" function below.
490
*/
491
case ARGP_KEY_ARG:
492
/* Cryptsetup always passes an argument, which is an empty
493
string if "none" was specified in /etc/crypttab. So if
494
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
497
}
498
break;
499
case ARGP_KEY_END:
500
break;
501
default:
502
return ARGP_ERR_UNKNOWN;
503
}
504
return 0;
505
}
506
507
/* This option parser is the same as parse_opt() above, except it
508
ignores everything but the --config-file option. */
509
error_t parse_opt_config_file(int key, char *arg,
510
__attribute__((unused))
511
struct argp_state *state){
512
switch(key){
513
case 'g': /* --global-options */
514
case 'G': /* --global-env */
515
case 'o': /* --options-for */
516
case 'E': /* --env-for */
517
case 'd': /* --disable */
518
case 'e': /* --enable */
519
case 128: /* --plugin-dir */
520
break;
521
case 129: /* --config-file */
522
free(argfile);
427
case 129:
523
428
argfile = strdup(arg);
524
429
if(argfile == NULL){
525
430
perror("strdup");
526
431
}
527
432
break;
528
case 130: /* --userid */
529
case 131: /* --groupid */
530
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;
531
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
532
445
case ARGP_KEY_END:
533
446
break;
534
447
default:
537
450
return 0;
538
451
}
539
452
540
struct argp argp = { .options = options,
541
.parser = parse_opt_config_file,
542
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
543
457
.doc = "Mandos plugin runner -- Run plugins" };
544
458
545
/* Parse using parse_opt_config_file() in order to get the custom
546
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
549
461
fprintf(stderr, "Unknown error while parsing arguments\n");
550
462
exitstatus = EXIT_FAILURE;
551
463
goto fallback;
552
464
}
553
554
/* Reset to the normal argument parser */
555
argp.parser = parse_opt;
556
557
/* Open the configfile if available */
558
if(argfile == NULL){
465
466
if (argfile == NULL){
559
467
conffp = fopen(AFILE, "r");
560
468
} else {
561
469
conffp = fopen(argfile, "r");
562
}
470
}
471
563
472
if(conffp != NULL){
564
473
char *org_line = NULL;
565
474
char *p, *arg, *new_arg, *line;
566
475
size_t size = 0;
476
ssize_t sret;
567
477
const char whitespace_delims[] = " \r\t\f\v\n";
568
478
const char comment_delim[] = "#";
569
479
576
486
}
577
487
custom_argv[0] = argv[0];
578
488
custom_argv[1] = NULL;
579
580
/* for each line in the config file, strip whitespace and ignore
581
commented text */
489
582
490
while(true){
583
491
sret = getline(&org_line, &size, conffp);
584
492
if(sret == -1){
613
521
}
614
522
}
615
523
free(org_line);
616
} else {
524
} else{
617
525
/* Check for harmful errors and go to fallback. Other errors might
618
526
not affect opening plugins */
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
528
perror("fopen");
621
529
exitstatus = EXIT_FAILURE;
622
530
goto fallback;
623
531
}
624
532
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
533
627
534
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
631
537
fprintf(stderr, "Unknown error while parsing arguments\n");
632
538
exitstatus = EXIT_FAILURE;
633
539
goto fallback;
634
540
}
635
541
}
636
542
637
/* Parse actual command line arguments, to let them override the
638
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
644
}
645
646
543
if(debug){
647
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
648
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
650
547
for(char **a = p->argv; *a != NULL; a++){
651
548
fprintf(stderr, "\tArg: %s\n", *a);
652
549
}
653
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
654
551
for(char **a = p->environ; *a != NULL; a++){
655
552
fprintf(stderr, "\t%s\n", *a);
656
553
}
657
554
}
658
555
}
659
556
660
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
661
562
setgid(gid);
662
if(ret == -1){
563
if (ret == -1){
663
564
perror("setgid");
664
565
}
665
ret = setuid(uid);
666
if(ret == -1){
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
566
567
if (plugindir == NULL){
671
568
dir = opendir(PDIR);
672
569
} else {
673
570
dir = opendir(plugindir);
694
591
695
592
FD_ZERO(&rfds_all);
696
593
697
/* Read and execute any executable in the plugin directory*/
698
594
while(true){
699
595
dirst = readdir(dir);
700
596
701
/* All directory entries have been processed */
597
// All directory entries have been processed
702
598
if(dirst == NULL){
703
if(errno == EBADF){
599
if (errno == EBADF){
704
600
perror("readdir");
705
601
exitstatus = EXIT_FAILURE;
706
602
goto fallback;
710
606
711
607
d_name_len = strlen(dirst->d_name);
712
608
713
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
714
610
{
715
611
bool bad_name = false;
716
612
718
614
719
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
720
616
".dpkg-old",
721
".dpkg-bak",
722
617
".dpkg-divert", NULL };
723
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
619
size_t pre_len = strlen(*pre);
732
627
break;
733
628
}
734
629
}
630
735
631
if(bad_name){
736
632
continue;
737
633
}
634
738
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
636
size_t suf_len = strlen(*suf);
740
637
if((d_name_len >= suf_len)
755
652
}
756
653
757
654
char *filename;
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
763
656
if(ret < 0){
764
657
perror("asprintf");
765
658
continue;
766
659
}
767
660
768
661
ret = stat(filename, &st);
769
if(ret == -1){
662
if (ret == -1){
770
663
perror("stat");
771
664
free(filename);
772
665
continue;
773
666
}
774
775
/* Ignore non-executable files */
776
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)){
777
669
if(debug){
778
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
671
" with bad type or mode\n", filename);
781
673
free(filename);
782
674
continue;
783
675
}
784
785
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
786
677
if(p == NULL){
787
678
perror("getplugin");
788
679
free(filename);
798
689
}
799
690
{
800
691
/* Add global arguments to argument list for this plugin */
801
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
802
693
if(g != NULL){
803
694
for(char **a = g->argv + 1; *a != NULL; a++){
804
695
if(not add_argument(p, *a)){
807
698
}
808
699
/* Add global environment variables */
809
700
for(char **e = g->environ; *e != NULL; e++){
810
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
811
702
perror("add_environment");
812
703
}
813
704
}
818
709
process, too. */
819
710
if(p->environ[0] != NULL){
820
711
for(char **e = environ; *e != NULL; e++){
821
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)){
822
718
perror("add_environment");
823
719
}
824
720
}
826
722
827
723
int pipefd[2];
828
724
ret = pipe(pipefd);
829
if(ret == -1){
725
if (ret == -1){
830
726
perror("pipe");
831
727
exitstatus = EXIT_FAILURE;
832
728
goto fallback;
833
729
}
834
/* Ask OS to automatic close the pipe on exec */
835
730
ret = set_cloexec_flag(pipefd[0]);
836
731
if(ret < 0){
837
732
perror("set_cloexec_flag");
845
740
goto fallback;
846
741
}
847
742
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
849
744
if(ret < 0){
850
745
perror("sigprocmask");
851
746
exitstatus = EXIT_FAILURE;
852
747
goto fallback;
853
748
}
854
/* Starting a new process to be watched */
749
// Starting a new process to be watched
855
750
pid_t pid = fork();
856
751
if(pid == -1){
857
752
perror("fork");
865
760
perror("sigaction");
866
761
_exit(EXIT_FAILURE);
867
762
}
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
764
if(ret < 0){
870
765
perror("sigprocmask");
871
766
_exit(EXIT_FAILURE);
872
767
}
873
768
874
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
770
if(ret == -1){
876
771
perror("dup2");
895
790
}
896
791
/* no return */
897
792
}
898
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
900
794
free(filename);
901
plugin *new_plugin = getplugin(dirst->d_name);
902
if(new_plugin == NULL){
903
perror("getplugin");
904
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);
905
800
if(ret < 0){
906
perror("sigprocmask");
801
perror("sigprocmask");
907
802
}
908
803
exitstatus = EXIT_FAILURE;
909
804
goto fallback;
910
805
}
911
806
912
new_plugin->pid = pid;
913
new_plugin->fd = pipefd[0];
914
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
915
812
/* Unblock SIGCHLD so signal handler can be run if this process
916
813
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
918
815
if(ret < 0){
919
816
perror("sigprocmask");
920
817
exitstatus = EXIT_FAILURE;
921
818
goto fallback;
922
819
}
923
820
924
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
925
822
926
if(maxfd < new_plugin->fd){
927
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
928
825
}
826
929
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
930
831
931
832
closedir(dir);
932
833
dir = NULL;
933
free_plugin(getplugin(NULL));
934
935
for(plugin *p = plugin_list; p != NULL; p = p->next){
936
if(p->pid != 0){
937
break;
938
}
939
if(p->next == NULL){
940
fprintf(stderr, "No plugin processes started. Incorrect plugin"
941
" directory?\n");
942
free_plugin_list();
943
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
944
839
}
945
946
/* Main loop while running plugins exist */
947
while(plugin_list){
840
while(process_list){
948
841
fd_set rfds = rfds_all;
949
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
843
if (select_ret == -1){
951
844
perror("select");
952
845
exitstatus = EXIT_FAILURE;
953
846
goto fallback;
954
847
}
955
848
/* OK, now either a process completed, or something can be read
956
849
from one of them */
957
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
958
851
/* Is this process completely done? */
959
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
960
853
/* Only accept the plugin output if it exited cleanly */
961
854
if(not WIFEXITED(proc->status)
962
855
or WEXITSTATUS(proc->status) != 0){
963
856
/* Bad exit by plugin */
964
965
857
if(debug){
966
858
if(WIFEXITED(proc->status)){
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
968
" status %d\n", proc->name,
969
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
970
861
WEXITSTATUS(proc->status));
971
} else if(WIFSIGNALED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
974
(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),
975
865
WTERMSIG(proc->status));
976
866
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
979
869
}
980
870
}
981
982
871
/* Remove the plugin */
983
872
FD_CLR(proc->fd, &rfds_all);
984
985
873
/* Block signal while modifying process_list */
986
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
875
if(ret < 0){
989
877
exitstatus = EXIT_FAILURE;
990
878
goto fallback;
991
879
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
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
}
997
893
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1000
896
if(ret < 0){
1001
897
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
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;
1011
905
}
1012
1013
906
/* This process exited nicely, so print its buffer */
1014
907
1015
908
bool bret = print_out_password(proc->buffer,
1016
909
proc->buffer_length);
1017
910
if(not bret){
1020
913
}
1021
914
goto fallback;
1022
915
}
1023
1024
916
/* This process has not completed. Does it have any output? */
1025
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1026
918
/* This process had nothing to say at this time */
1027
proc = proc->next;
1028
919
continue;
1029
920
}
1030
921
/* Before reading, make the process' data buffer large enough */
1031
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
924
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1035
926
perror("malloc");
1036
927
exitstatus = EXIT_FAILURE;
1037
928
goto fallback;
1039
930
proc->buffer_size += BUFFER_SIZE;
1040
931
}
1041
932
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1045
936
/* Read error from this process; ignore the error */
1046
proc = proc->next;
1047
937
continue;
1048
938
}
1049
if(sret == 0){
939
if(ret == 0){
1050
940
/* got EOF */
1051
941
proc->eof = true;
1052
942
} else {
1053
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1054
944
}
1055
945
}
1056
946
}
1058
948
1059
949
fallback:
1060
950
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1062
952
/* Fallback if all plugins failed, none are found or an error
1063
953
occured */
1064
954
bool bret;
1065
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
956
char *passwordbuffer = getpass("Password: ");
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1071
len--;
1072
}
1073
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1074
958
if(not bret){
1075
959
perror("print_out_password");
1076
960
exitstatus = EXIT_FAILURE;
1083
967
perror("sigaction");
1084
968
exitstatus = EXIT_FAILURE;
1085
969
}
1086
970
1087
971
if(custom_argv != NULL){
1088
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1089
973
free(*arg);
1090
974
}
1091
975
free(custom_argv);
1092
976
}
977
free_plugin_list(plugin_list);
1093
978
1094
979
if(dir != NULL){
1095
980
closedir(dir);
1096
981
}
1097
982
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1100
if(p->pid != 0){
1101
close(p->fd);
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1106
}
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");
1107
991
}
992
free(process_list->buffer);
993
free(process_list);
1108
994
}
1109
995
1110
996
/* Wait for any remaining child processes to terminate */
1114
1000
if(errno != ECHILD){
1115
1001
perror("wait");
1116
1002
}
1117
1118
free_plugin_list();
1119
1003
1120
1004
free(plugindir);
1121
1005
free(argfile);
1122
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0