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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:20:46 UTC
- Revision ID: teddy@fukt.bsnet.se-20090905172046-s92efz3m1j4c1sti
* plugins-runner.c (main): Bug fix: Close config file.
- 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
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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,
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
66
71
67
72
#define BUFFER_SIZE 256
68
73
69
74
#define PDIR "/lib/mandos/plugins.d"
70
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
76
72
const char *argp_program_version = "plugin-runner 1.0";
77
const char *argp_program_version = "plugin-runner " VERSION;
73
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
79
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
80
typedef struct plugin{
90
81
char *name; /* can be NULL or any plugin name */
91
82
char **argv;
93
84
char **environ;
94
85
int envc;
95
86
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
96
97
struct plugin *next;
97
98
} plugin;
98
99
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))){
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
103
109
return p;
104
110
}
105
111
}
106
112
/* Create a new plugin */
107
113
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
114
if(new_plugin == NULL){
109
115
return NULL;
110
116
}
111
117
char *copy_name = NULL;
112
118
if(name != NULL){
113
119
copy_name = strdup(name);
114
120
if(copy_name == NULL){
121
free(new_plugin);
115
122
return NULL;
116
123
}
117
124
}
118
125
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
124
130
125
131
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
132
if(new_plugin->argv == NULL){
127
133
free(copy_name);
128
134
free(new_plugin);
129
135
return NULL;
130
136
}
131
137
new_plugin->argv[0] = copy_name;
132
138
new_plugin->argv[1] = NULL;
133
139
134
140
new_plugin->environ = malloc(sizeof(char *));
135
141
if(new_plugin->environ == NULL){
136
142
free(copy_name);
139
145
return NULL;
140
146
}
141
147
new_plugin->environ[0] = NULL;
148
142
149
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
150
plugin_list = new_plugin;
144
151
return new_plugin;
145
152
}
146
153
176
183
}
177
184
178
185
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
186
static bool add_environment(plugin *p, const char *def, bool replace){
180
187
if(p == NULL){
181
188
return false;
182
189
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
183
207
return add_to_char_array(def, &(p->environ), &(p->envc));
184
208
}
185
209
186
187
210
/*
188
211
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
212
* Descriptor Flags".
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
191
214
*/
192
static int set_cloexec_flag(int fd)
193
{
215
static int set_cloexec_flag(int fd){
194
216
int ret = fcntl(fd, F_GETFD, 0);
195
217
/* If reading the flags failed, return error indication now. */
196
218
if(ret < 0){
200
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
223
}
202
224
203
process *process_list = NULL;
204
225
205
226
/* Mark processes as completed when they exit, and save their exit
206
227
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
208
230
while(true){
209
process *proc = process_list;
231
plugin *proc = plugin_list;
210
232
int status;
211
233
pid_t pid = waitpid(-1, &status, WNOHANG);
212
234
if(pid == 0){
214
236
break;
215
237
}
216
238
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
219
242
}
220
/* No child processes */
221
break;
243
perror("waitpid");
222
244
}
223
245
224
246
/* A child exited, find it in process_list */
225
247
while(proc != NULL and proc->pid != pid){
226
248
proc = proc->next;
230
252
continue;
231
253
}
232
254
proc->status = status;
233
proc->completed = true;
255
proc->completed = 1;
234
256
}
257
errno = old_errno;
235
258
}
236
259
237
bool print_out_password(const char *buffer, size_t length){
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
238
262
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
263
for(size_t written = 0; written < length; written += (size_t)ret){
243
264
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
265
length - written));
249
270
return true;
250
271
}
251
272
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);
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
297
}
298
}
299
300
free(plugin_node);
301
}
302
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
264
306
}
265
307
}
266
308
274
316
struct stat st;
275
317
fd_set rfds_all;
276
318
int ret, maxfd = 0;
319
ssize_t sret;
320
intmax_t tmpmax;
277
321
uid_t uid = 65534;
278
322
gid_t gid = 65534;
279
323
bool debug = false;
304
348
{ .name = "global-options", .key = 'g',
305
349
.arg = "OPTION[,OPTION[,...]]",
306
350
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
351
{ .name = "global-env", .key = 'G',
308
352
.arg = "VAR=value",
309
353
.doc = "Environment variable passed to all plugins" },
310
354
{ .name = "options-for", .key = 'o',
311
355
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
356
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
357
{ .name = "env-for", .key = 'E',
314
358
.arg = "PLUGIN:ENV=value",
315
359
.doc = "Environment variable passed to specified plugin" },
316
360
{ .name = "disable", .key = 'd',
317
361
.arg = "PLUGIN",
318
362
.doc = "Disable a specific plugin", .group = 1 },
363
{ .name = "enable", .key = 'e',
364
.arg = "PLUGIN",
365
.doc = "Enable a specific plugin", .group = 1 },
319
366
{ .name = "plugin-dir", .key = 128,
320
367
.arg = "DIRECTORY",
321
368
.doc = "Specify a different plugin directory", .group = 2 },
333
380
{ .name = NULL }
334
381
};
335
382
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'){
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
386
switch(key){
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
346
392
continue;
347
393
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
394
if(not add_argument(getplugin(NULL), plugin_option)){
349
395
perror("add_argument");
350
396
return ARGP_ERR_UNKNOWN;
351
397
}
352
398
}
353
399
}
354
400
break;
355
case 'e':
401
case 'G': /* --global-env */
356
402
if(arg == NULL){
357
403
break;
358
404
}
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
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
367
407
}
368
408
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
}
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
389
420
}
390
421
}
391
422
}
392
423
break;
393
case 'f':
424
case 'E': /* --env-for */
394
425
if(arg == NULL){
395
426
break;
396
427
}
399
430
if(envdef == NULL){
400
431
break;
401
432
}
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)){
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
408
435
perror("add_environment");
409
436
}
410
437
}
411
438
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
415
442
if(p == NULL){
416
443
return ARGP_ERR_UNKNOWN;
417
444
}
418
445
p->disabled = true;
419
446
}
420
447
break;
421
case 128:
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
422
459
plugindir = strdup(arg);
423
460
if(plugindir == NULL){
424
461
perror("strdup");
425
}
426
break;
427
case 129:
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
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
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
490
debug = true;
491
break;
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
428
528
argfile = strdup(arg);
429
529
if(argfile == NULL){
430
530
perror("strdup");
431
531
}
432
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
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
442
536
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
537
case ARGP_KEY_END:
446
538
break;
447
539
default:
450
542
return 0;
451
543
}
452
544
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
457
548
.doc = "Mandos plugin runner -- Run plugins" };
458
549
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
461
554
fprintf(stderr, "Unknown error while parsing arguments\n");
462
555
exitstatus = EXIT_FAILURE;
463
556
goto fallback;
464
557
}
465
466
if (argfile == NULL){
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
467
564
conffp = fopen(AFILE, "r");
468
565
} else {
469
566
conffp = fopen(argfile, "r");
470
567
}
471
472
568
if(conffp != NULL){
473
569
char *org_line = NULL;
474
570
char *p, *arg, *new_arg, *line;
475
571
size_t size = 0;
476
ssize_t sret;
477
572
const char whitespace_delims[] = " \r\t\f\v\n";
478
573
const char comment_delim[] = "#";
479
574
480
575
custom_argc = 1;
481
576
custom_argv = malloc(sizeof(char*) * 2);
482
577
if(custom_argv == NULL){
487
582
custom_argv[0] = argv[0];
488
583
custom_argv[1] = NULL;
489
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
490
587
while(true){
491
588
sret = getline(&org_line, &size, conffp);
492
589
if(sret == -1){
493
590
break;
494
591
}
495
592
496
593
line = org_line;
497
594
arg = strsep(&line, comment_delim);
498
595
while((p = strsep(&arg, whitespace_delims)) != NULL){
517
614
goto fallback;
518
615
}
519
616
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
617
custom_argv[custom_argc] = NULL;
521
618
}
522
619
}
620
do{
621
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
623
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
523
628
free(org_line);
524
} else{
629
} else {
525
630
/* Check for harmful errors and go to fallback. Other errors might
526
631
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
633
perror("fopen");
529
634
exitstatus = EXIT_FAILURE;
530
635
goto fallback;
531
636
}
532
637
}
533
638
/* If there was any arguments from configuration file,
639
pass them to parser as command arguments */
534
640
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
537
644
fprintf(stderr, "Unknown error while parsing arguments\n");
538
645
exitstatus = EXIT_FAILURE;
539
646
goto fallback;
540
647
}
541
648
}
542
649
650
/* Parse actual command line arguments, to let them override the
651
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
exitstatus = EXIT_FAILURE;
656
goto fallback;
657
}
658
543
659
if(debug){
544
660
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
661
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
663
for(char **a = p->argv; *a != NULL; a++){
548
664
fprintf(stderr, "\tArg: %s\n", *a);
549
665
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
666
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
667
for(char **a = p->environ; *a != NULL; a++){
552
668
fprintf(stderr, "\t%s\n", *a);
553
669
}
554
670
}
555
671
}
556
672
673
/* Strip permissions down to nobody */
674
setgid(gid);
675
if(ret == -1){
676
perror("setgid");
677
}
557
678
ret = setuid(uid);
558
if (ret == -1){
679
if(ret == -1){
559
680
perror("setuid");
560
681
}
561
682
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
683
if(plugindir == NULL){
568
684
dir = opendir(PDIR);
569
685
} else {
570
686
dir = opendir(plugindir);
591
707
592
708
FD_ZERO(&rfds_all);
593
709
710
/* Read and execute any executable in the plugin directory*/
594
711
while(true){
595
712
dirst = readdir(dir);
596
713
597
// All directory entries have been processed
714
/* All directory entries have been processed */
598
715
if(dirst == NULL){
599
if (errno == EBADF){
716
if(errno == EBADF){
600
717
perror("readdir");
601
718
exitstatus = EXIT_FAILURE;
602
719
goto fallback;
606
723
607
724
d_name_len = strlen(dirst->d_name);
608
725
609
// Ignore dotfiles, backup files and other junk
726
/* Ignore dotfiles, backup files and other junk */
610
727
{
611
728
bool bad_name = false;
612
729
614
731
615
732
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
733
".dpkg-old",
734
".dpkg-bak",
617
735
".dpkg-divert", NULL };
618
736
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
737
size_t pre_len = strlen(*pre);
627
745
break;
628
746
}
629
747
}
630
631
748
if(bad_name){
632
749
continue;
633
750
}
634
635
751
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
752
size_t suf_len = strlen(*suf);
637
753
if((d_name_len >= suf_len)
650
766
continue;
651
767
}
652
768
}
653
769
654
770
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
771
if(plugindir == NULL){
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
773
} else {
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
775
}
656
776
if(ret < 0){
657
777
perror("asprintf");
658
778
continue;
659
779
}
660
780
661
781
ret = stat(filename, &st);
662
if (ret == -1){
782
if(ret == -1){
663
783
perror("stat");
664
784
free(filename);
665
785
continue;
666
786
}
667
787
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
788
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
790
if(debug){
670
791
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
792
" with bad type or mode\n", filename);
673
794
free(filename);
674
795
continue;
675
796
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
797
798
plugin *p = getplugin(dirst->d_name);
677
799
if(p == NULL){
678
800
perror("getplugin");
679
801
free(filename);
689
811
}
690
812
{
691
813
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
814
plugin *g = getplugin(NULL);
693
815
if(g != NULL){
694
816
for(char **a = g->argv + 1; *a != NULL; a++){
695
817
if(not add_argument(p, *a)){
698
820
}
699
821
/* Add global environment variables */
700
822
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
823
if(not add_environment(p, *e, false)){
702
824
perror("add_environment");
703
825
}
704
826
}
709
831
process, too. */
710
832
if(p->environ[0] != NULL){
711
833
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)){
834
if(not add_environment(p, *e, false)){
718
835
perror("add_environment");
719
836
}
720
837
}
722
839
723
840
int pipefd[2];
724
841
ret = pipe(pipefd);
725
if (ret == -1){
842
if(ret == -1){
726
843
perror("pipe");
727
844
exitstatus = EXIT_FAILURE;
728
845
goto fallback;
729
846
}
847
/* Ask OS to automatic close the pipe on exec */
730
848
ret = set_cloexec_flag(pipefd[0]);
731
849
if(ret < 0){
732
850
perror("set_cloexec_flag");
740
858
goto fallback;
741
859
}
742
860
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
744
862
if(ret < 0){
745
863
perror("sigprocmask");
746
864
exitstatus = EXIT_FAILURE;
747
865
goto fallback;
748
866
}
749
// Starting a new process to be watched
867
/* Starting a new process to be watched */
750
868
pid_t pid = fork();
751
869
if(pid == -1){
752
870
perror("fork");
760
878
perror("sigaction");
761
879
_exit(EXIT_FAILURE);
762
880
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
881
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
882
if(ret < 0){
765
883
perror("sigprocmask");
766
884
_exit(EXIT_FAILURE);
767
885
}
768
886
769
887
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
888
if(ret == -1){
771
889
perror("dup2");
790
908
}
791
909
/* no return */
792
910
}
793
/* parent process */
911
/* Parent process */
912
close(pipefd[1]); /* Close unused write end of pipe */
794
913
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);
914
plugin *new_plugin = getplugin(dirst->d_name);
915
if(new_plugin == NULL){
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
800
918
if(ret < 0){
801
perror("sigprocmask");
919
perror("sigprocmask");
802
920
}
803
921
exitstatus = EXIT_FAILURE;
804
922
goto fallback;
805
923
}
806
924
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
925
new_plugin->pid = pid;
926
new_plugin->fd = pipefd[0];
927
812
928
/* Unblock SIGCHLD so signal handler can be run if this process
813
929
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
815
931
if(ret < 0){
816
932
perror("sigprocmask");
817
933
exitstatus = EXIT_FAILURE;
818
934
goto fallback;
819
935
}
820
936
821
FD_SET(new_process->fd, &rfds_all);
937
FD_SET(new_plugin->fd, &rfds_all);
822
938
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
939
if(maxfd < new_plugin->fd){
940
maxfd = new_plugin->fd;
825
941
}
826
827
942
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
943
832
944
closedir(dir);
833
945
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
946
free_plugin(getplugin(NULL));
947
948
for(plugin *p = plugin_list; p != NULL; p = p->next){
949
if(p->pid != 0){
950
break;
951
}
952
if(p->next == NULL){
953
fprintf(stderr, "No plugin processes started. Incorrect plugin"
954
" directory?\n");
955
free_plugin_list();
956
}
839
957
}
840
while(process_list){
958
959
/* Main loop while running plugins exist */
960
while(plugin_list){
841
961
fd_set rfds = rfds_all;
842
962
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
963
if(select_ret == -1){
844
964
perror("select");
845
965
exitstatus = EXIT_FAILURE;
846
966
goto fallback;
847
967
}
848
968
/* OK, now either a process completed, or something can be read
849
969
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
970
for(plugin *proc = plugin_list; proc != NULL;){
851
971
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
972
if(proc->completed and proc->eof){
853
973
/* Only accept the plugin output if it exited cleanly */
854
974
if(not WIFEXITED(proc->status)
855
975
or WEXITSTATUS(proc->status) != 0){
856
976
/* Bad exit by plugin */
977
857
978
if(debug){
858
979
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
981
" status %d\n", proc->name,
982
(intmax_t) (proc->pid),
861
983
WEXITSTATUS(proc->status));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(proc->status));
984
} else if(WIFSIGNALED(proc->status)){
985
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
986
" signal %d: %s\n", proc->name,
987
(intmax_t) (proc->pid),
988
WTERMSIG(proc->status),
989
strsignal(WTERMSIG(proc->status)));
866
990
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
991
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
992
" core\n", proc->name, (intmax_t) (proc->pid));
869
993
}
870
994
}
995
871
996
/* Remove the plugin */
872
997
FD_CLR(proc->fd, &rfds_all);
998
873
999
/* Block signal while modifying process_list */
874
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
1001
if(ret < 0){
877
1003
exitstatus = EXIT_FAILURE;
878
1004
goto fallback;
879
1005
}
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
}
1006
1007
plugin *next_plugin = proc->next;
1008
free_plugin(proc);
1009
proc = next_plugin;
1010
893
1011
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
896
1014
if(ret < 0){
897
1015
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;
1016
exitstatus = EXIT_FAILURE;
1017
goto fallback;
1018
}
1019
1020
if(plugin_list == NULL){
1021
break;
1022
}
1023
1024
continue;
905
1025
}
1026
906
1027
/* This process exited nicely, so print its buffer */
907
1028
908
1029
bool bret = print_out_password(proc->buffer,
909
1030
proc->buffer_length);
910
1031
if(not bret){
913
1034
}
914
1035
goto fallback;
915
1036
}
1037
916
1038
/* This process has not completed. Does it have any output? */
917
1039
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1040
/* This process had nothing to say at this time */
1041
proc = proc->next;
919
1042
continue;
920
1043
}
921
1044
/* Before reading, make the process' data buffer large enough */
922
1045
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1046
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1047
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
1048
if(proc->buffer == NULL){
926
1049
perror("malloc");
927
1050
exitstatus = EXIT_FAILURE;
928
1051
goto fallback;
930
1053
proc->buffer_size += BUFFER_SIZE;
931
1054
}
932
1055
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1058
if(sret < 0){
936
1059
/* Read error from this process; ignore the error */
1060
proc = proc->next;
937
1061
continue;
938
1062
}
939
if(ret == 0){
1063
if(sret == 0){
940
1064
/* got EOF */
941
1065
proc->eof = true;
942
1066
} else {
943
proc->buffer_length += (size_t) ret;
1067
proc->buffer_length += (size_t) sret;
944
1068
}
945
1069
}
946
1070
}
947
948
1071
1072
949
1073
fallback:
950
1074
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1076
/* Fallback if all plugins failed, none are found or an error
953
1077
occured */
954
1078
bool bret;
955
1079
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1080
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1081
size_t len = strlen(passwordbuffer);
1082
/* Strip trailing newline */
1083
if(len > 0 and passwordbuffer[len-1] == '\n'){
1084
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1085
len--;
1086
}
1087
bret = print_out_password(passwordbuffer, len);
958
1088
if(not bret){
959
1089
perror("print_out_password");
960
1090
exitstatus = EXIT_FAILURE;
967
1097
perror("sigaction");
968
1098
exitstatus = EXIT_FAILURE;
969
1099
}
970
1100
971
1101
if(custom_argv != NULL){
972
1102
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1103
free(*arg);
974
1104
}
975
1105
free(custom_argv);
976
1106
}
977
free_plugin_list(plugin_list);
978
1107
979
1108
if(dir != NULL){
980
1109
closedir(dir);
981
1110
}
982
1111
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1112
/* Kill the processes */
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
if(p->pid != 0){
1115
close(p->fd);
1116
ret = kill(p->pid, SIGTERM);
1117
if(ret == -1 and errno != ESRCH){
1118
/* Set-uid proccesses might not get closed */
1119
perror("kill");
1120
}
991
1121
}
992
free(process_list->buffer);
993
free(process_list);
994
1122
}
995
1123
996
1124
/* Wait for any remaining child processes to terminate */
1000
1128
if(errno != ECHILD){
1001
1129
perror("wait");
1002
1130
}
1003
1131
1132
free_plugin_list();
1133
1004
1134
free(plugindir);
1005
1135
free(argfile);
1006
1136
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0