To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 116
- compare with another revision
- download diff
- download tarball
- view history from revision 116
- Committer: Teddy Hogeborn
- Date: 2008-08-30 11:31:37 UTC
- Revision ID: teddy@fukt.bsnet.se-20080830113137-v0inyj0limprzfwn
* mandos-options.xml (priority): Added <acronym> tags.
* mandos.xml (NAME): Improved wording.
* mandos.xml (NAME): Improved wording.
- 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,
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
66
72
67
#define BUFFER_SIZE 256
73
68
74
69
#define PDIR "/lib/mandos/plugins.d"
75
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
71
77
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
78
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
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
80
89
typedef struct plugin{
81
90
char *name; /* can be NULL or any plugin name */
82
91
char **argv;
84
93
char **environ;
85
94
int envc;
86
95
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;
97
96
struct plugin *next;
98
97
} plugin;
99
98
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))){
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))){
109
103
return p;
110
104
}
111
105
}
112
106
/* Create a new plugin */
113
107
plugin *new_plugin = malloc(sizeof(plugin));
114
if(new_plugin == NULL){
108
if (new_plugin == NULL){
115
109
return NULL;
116
110
}
117
111
char *copy_name = NULL;
118
112
if(name != NULL){
119
113
copy_name = strdup(name);
120
114
if(copy_name == NULL){
121
free(new_plugin);
122
115
return NULL;
123
116
}
124
117
}
125
118
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
130
124
131
125
new_plugin->argv = malloc(sizeof(char *) * 2);
132
if(new_plugin->argv == NULL){
126
if (new_plugin->argv == NULL){
133
127
free(copy_name);
134
128
free(new_plugin);
135
129
return NULL;
136
130
}
137
131
new_plugin->argv[0] = copy_name;
138
132
new_plugin->argv[1] = NULL;
139
133
140
134
new_plugin->environ = malloc(sizeof(char *));
141
135
if(new_plugin->environ == NULL){
142
136
free(copy_name);
145
139
return NULL;
146
140
}
147
141
new_plugin->environ[0] = NULL;
148
149
142
/* Append the new plugin to the list */
150
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
151
144
return new_plugin;
152
145
}
153
146
183
176
}
184
177
185
178
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
187
180
if(p == NULL){
188
181
return false;
189
182
}
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
}
207
183
return add_to_char_array(def, &(p->environ), &(p->envc));
208
184
}
209
185
186
210
187
/*
211
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
212
189
* Descriptor Flags".
213
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
214
191
*/
215
static int set_cloexec_flag(int fd){
192
static int set_cloexec_flag(int fd)
193
{
216
194
int ret = fcntl(fd, F_GETFD, 0);
217
195
/* If reading the flags failed, return error indication now. */
218
196
if(ret < 0){
222
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
223
201
}
224
202
203
process *process_list = NULL;
225
204
226
205
/* Mark processes as completed when they exit, and save their exit
227
206
status. */
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
230
208
while(true){
231
plugin *proc = plugin_list;
209
process *proc = process_list;
232
210
int status;
233
211
pid_t pid = waitpid(-1, &status, WNOHANG);
234
212
if(pid == 0){
236
214
break;
237
215
}
238
216
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
217
if (errno != ECHILD){
218
perror("waitpid");
242
219
}
243
perror("waitpid");
220
/* No child processes */
221
break;
244
222
}
245
223
246
224
/* A child exited, find it in process_list */
247
225
while(proc != NULL and proc->pid != pid){
248
226
proc = proc->next;
252
230
continue;
253
231
}
254
232
proc->status = status;
255
proc->completed = 1;
233
proc->completed = true;
256
234
}
257
errno = old_errno;
258
235
}
259
236
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
262
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
263
242
for(size_t written = 0; written < length; written += (size_t)ret){
264
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
244
length - written));
270
249
return true;
271
250
}
272
251
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);
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);
306
264
}
307
265
}
308
266
316
274
struct stat st;
317
275
fd_set rfds_all;
318
276
int ret, maxfd = 0;
319
ssize_t sret;
320
intmax_t tmpmax;
321
277
uid_t uid = 65534;
322
278
gid_t gid = 65534;
323
279
bool debug = false;
348
304
{ .name = "global-options", .key = 'g',
349
305
.arg = "OPTION[,OPTION[,...]]",
350
306
.doc = "Options passed to all plugins" },
351
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
352
308
.arg = "VAR=value",
353
309
.doc = "Environment variable passed to all plugins" },
354
310
{ .name = "options-for", .key = 'o',
355
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
356
312
.doc = "Options passed only to specified plugin" },
357
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
358
314
.arg = "PLUGIN:ENV=value",
359
315
.doc = "Environment variable passed to specified plugin" },
360
316
{ .name = "disable", .key = 'd',
361
317
.arg = "PLUGIN",
362
318
.doc = "Disable a specific plugin", .group = 1 },
363
{ .name = "enable", .key = 'e',
364
.arg = "PLUGIN",
365
.doc = "Enable a specific plugin", .group = 1 },
366
319
{ .name = "plugin-dir", .key = 128,
367
320
.arg = "DIRECTORY",
368
321
.doc = "Specify a different plugin directory", .group = 2 },
380
333
{ .name = NULL }
381
334
};
382
335
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'){
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'){
392
346
continue;
393
347
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
395
349
perror("add_argument");
396
350
return ARGP_ERR_UNKNOWN;
397
351
}
398
352
}
399
353
}
400
354
break;
401
case 'G': /* --global-env */
355
case 'e':
402
356
if(arg == NULL){
403
357
break;
404
358
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
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
}
407
367
}
408
368
break;
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;
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
}
420
389
}
421
390
}
422
391
}
423
392
break;
424
case 'E': /* --env-for */
393
case 'f':
425
394
if(arg == NULL){
426
395
break;
427
396
}
430
399
if(envdef == NULL){
431
400
break;
432
401
}
433
*envdef = '\0';
434
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)){
435
408
perror("add_environment");
436
409
}
437
410
}
438
411
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
442
415
if(p == NULL){
443
416
return ARGP_ERR_UNKNOWN;
444
417
}
445
418
p->disabled = true;
446
419
}
447
420
break;
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);
421
case 128:
459
422
plugindir = strdup(arg);
460
423
if(plugindir == NULL){
461
424
perror("strdup");
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);
425
}
426
break;
427
case 129:
528
428
argfile = strdup(arg);
529
429
if(argfile == NULL){
530
430
perror("strdup");
531
431
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
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;
536
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
537
445
case ARGP_KEY_END:
538
446
break;
539
447
default:
542
450
return 0;
543
451
}
544
452
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
548
457
.doc = "Mandos plugin runner -- Run plugins" };
549
458
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){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
554
461
fprintf(stderr, "Unknown error while parsing arguments\n");
555
462
exitstatus = EXIT_FAILURE;
556
463
goto fallback;
557
464
}
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
465
466
if (argfile == NULL){
564
467
conffp = fopen(AFILE, "r");
565
468
} else {
566
469
conffp = fopen(argfile, "r");
567
470
}
471
568
472
if(conffp != NULL){
569
473
char *org_line = NULL;
570
474
char *p, *arg, *new_arg, *line;
571
475
size_t size = 0;
476
ssize_t sret;
572
477
const char whitespace_delims[] = " \r\t\f\v\n";
573
478
const char comment_delim[] = "#";
574
479
575
480
custom_argc = 1;
576
481
custom_argv = malloc(sizeof(char*) * 2);
577
482
if(custom_argv == NULL){
582
487
custom_argv[0] = argv[0];
583
488
custom_argv[1] = NULL;
584
489
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
587
490
while(true){
588
491
sret = getline(&org_line, &size, conffp);
589
492
if(sret == -1){
590
493
break;
591
494
}
592
495
593
496
line = org_line;
594
497
arg = strsep(&line, comment_delim);
595
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
614
517
goto fallback;
615
518
}
616
519
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
520
custom_argv[custom_argc] = NULL;
618
521
}
619
522
}
620
523
free(org_line);
621
} else {
524
} else{
622
525
/* Check for harmful errors and go to fallback. Other errors might
623
526
not affect opening plugins */
624
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
625
528
perror("fopen");
626
529
exitstatus = EXIT_FAILURE;
627
530
goto fallback;
628
531
}
629
532
}
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
533
632
534
if(custom_argv != NULL){
633
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
0, NULL);
635
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
636
537
fprintf(stderr, "Unknown error while parsing arguments\n");
637
538
exitstatus = EXIT_FAILURE;
638
539
goto fallback;
639
540
}
640
541
}
641
542
642
/* Parse actual command line arguments, to let them override the
643
config file */
644
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
645
if(ret == ARGP_ERR_UNKNOWN){
646
fprintf(stderr, "Unknown error while parsing arguments\n");
647
exitstatus = EXIT_FAILURE;
648
goto fallback;
649
}
650
651
543
if(debug){
652
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
653
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
655
547
for(char **a = p->argv; *a != NULL; a++){
656
548
fprintf(stderr, "\tArg: %s\n", *a);
657
549
}
658
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
659
551
for(char **a = p->environ; *a != NULL; a++){
660
552
fprintf(stderr, "\t%s\n", *a);
661
553
}
662
554
}
663
555
}
664
556
665
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
666
562
setgid(gid);
667
if(ret == -1){
563
if (ret == -1){
668
564
perror("setgid");
669
565
}
670
ret = setuid(uid);
671
if(ret == -1){
672
perror("setuid");
673
}
674
675
if(plugindir == NULL){
566
567
if (plugindir == NULL){
676
568
dir = opendir(PDIR);
677
569
} else {
678
570
dir = opendir(plugindir);
699
591
700
592
FD_ZERO(&rfds_all);
701
593
702
/* Read and execute any executable in the plugin directory*/
703
594
while(true){
704
595
dirst = readdir(dir);
705
596
706
/* All directory entries have been processed */
597
// All directory entries have been processed
707
598
if(dirst == NULL){
708
if(errno == EBADF){
599
if (errno == EBADF){
709
600
perror("readdir");
710
601
exitstatus = EXIT_FAILURE;
711
602
goto fallback;
715
606
716
607
d_name_len = strlen(dirst->d_name);
717
608
718
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
719
610
{
720
611
bool bad_name = false;
721
612
723
614
724
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
725
616
".dpkg-old",
726
".dpkg-bak",
727
617
".dpkg-divert", NULL };
728
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
729
619
size_t pre_len = strlen(*pre);
737
627
break;
738
628
}
739
629
}
630
740
631
if(bad_name){
741
632
continue;
742
633
}
634
743
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
744
636
size_t suf_len = strlen(*suf);
745
637
if((d_name_len >= suf_len)
758
650
continue;
759
651
}
760
652
}
761
653
762
654
char *filename;
763
if(plugindir == NULL){
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
765
} else {
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
656
if(ret < 0){
769
657
perror("asprintf");
770
658
continue;
771
659
}
772
660
773
661
ret = stat(filename, &st);
774
if(ret == -1){
662
if (ret == -1){
775
663
perror("stat");
776
664
free(filename);
777
665
continue;
778
666
}
779
667
780
/* Ignore non-executable files */
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
782
669
if(debug){
783
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
784
671
" with bad type or mode\n", filename);
786
673
free(filename);
787
674
continue;
788
675
}
789
790
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
791
677
if(p == NULL){
792
678
perror("getplugin");
793
679
free(filename);
803
689
}
804
690
{
805
691
/* Add global arguments to argument list for this plugin */
806
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
807
693
if(g != NULL){
808
694
for(char **a = g->argv + 1; *a != NULL; a++){
809
695
if(not add_argument(p, *a)){
812
698
}
813
699
/* Add global environment variables */
814
700
for(char **e = g->environ; *e != NULL; e++){
815
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
816
702
perror("add_environment");
817
703
}
818
704
}
823
709
process, too. */
824
710
if(p->environ[0] != NULL){
825
711
for(char **e = environ; *e != NULL; e++){
826
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)){
827
718
perror("add_environment");
828
719
}
829
720
}
831
722
832
723
int pipefd[2];
833
724
ret = pipe(pipefd);
834
if(ret == -1){
725
if (ret == -1){
835
726
perror("pipe");
836
727
exitstatus = EXIT_FAILURE;
837
728
goto fallback;
838
729
}
839
/* Ask OS to automatic close the pipe on exec */
840
730
ret = set_cloexec_flag(pipefd[0]);
841
731
if(ret < 0){
842
732
perror("set_cloexec_flag");
850
740
goto fallback;
851
741
}
852
742
/* Block SIGCHLD until process is safely in process list */
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
854
744
if(ret < 0){
855
745
perror("sigprocmask");
856
746
exitstatus = EXIT_FAILURE;
857
747
goto fallback;
858
748
}
859
/* Starting a new process to be watched */
749
// Starting a new process to be watched
860
750
pid_t pid = fork();
861
751
if(pid == -1){
862
752
perror("fork");
870
760
perror("sigaction");
871
761
_exit(EXIT_FAILURE);
872
762
}
873
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
764
if(ret < 0){
875
765
perror("sigprocmask");
876
766
_exit(EXIT_FAILURE);
877
767
}
878
768
879
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
880
770
if(ret == -1){
881
771
perror("dup2");
900
790
}
901
791
/* no return */
902
792
}
903
/* Parent process */
904
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
905
794
free(filename);
906
plugin *new_plugin = getplugin(dirst->d_name);
907
if(new_plugin == NULL){
908
perror("getplugin");
909
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);
910
800
if(ret < 0){
911
perror("sigprocmask");
801
perror("sigprocmask");
912
802
}
913
803
exitstatus = EXIT_FAILURE;
914
804
goto fallback;
915
805
}
916
806
917
new_plugin->pid = pid;
918
new_plugin->fd = pipefd[0];
919
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
920
812
/* Unblock SIGCHLD so signal handler can be run if this process
921
813
has already completed */
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
815
if(ret < 0){
924
816
perror("sigprocmask");
925
817
exitstatus = EXIT_FAILURE;
926
818
goto fallback;
927
819
}
928
820
929
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
930
822
931
if(maxfd < new_plugin->fd){
932
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
933
825
}
826
934
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
935
831
936
832
closedir(dir);
937
833
dir = NULL;
938
free_plugin(getplugin(NULL));
939
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
949
839
}
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
840
while(process_list){
953
841
fd_set rfds = rfds_all;
954
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
843
if (select_ret == -1){
956
844
perror("select");
957
845
exitstatus = EXIT_FAILURE;
958
846
goto fallback;
959
847
}
960
848
/* OK, now either a process completed, or something can be read
961
849
from one of them */
962
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
963
851
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
965
853
/* Only accept the plugin output if it exited cleanly */
966
854
if(not WIFEXITED(proc->status)
967
855
or WEXITSTATUS(proc->status) != 0){
968
856
/* Bad exit by plugin */
969
970
857
if(debug){
971
858
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
975
861
WEXITSTATUS(proc->status));
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d: %s\n", proc->name,
979
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status),
981
strsignal(WTERMSIG(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));
982
866
} else if(WCOREDUMP(proc->status)){
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
985
869
}
986
870
}
987
988
871
/* Remove the plugin */
989
872
FD_CLR(proc->fd, &rfds_all);
990
991
873
/* Block signal while modifying process_list */
992
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
993
875
if(ret < 0){
995
877
exitstatus = EXIT_FAILURE;
996
878
goto fallback;
997
879
}
998
999
plugin *next_plugin = proc->next;
1000
free_plugin(proc);
1001
proc = next_plugin;
1002
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
}
1003
893
/* We are done modifying process list, so unblock signal */
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1006
896
if(ret < 0){
1007
897
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1009
goto fallback;
1010
}
1011
1012
if(plugin_list == NULL){
1013
break;
1014
}
1015
1016
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;
1017
905
}
1018
1019
906
/* This process exited nicely, so print its buffer */
1020
907
1021
908
bool bret = print_out_password(proc->buffer,
1022
909
proc->buffer_length);
1023
910
if(not bret){
1026
913
}
1027
914
goto fallback;
1028
915
}
1029
1030
916
/* This process has not completed. Does it have any output? */
1031
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1032
918
/* This process had nothing to say at this time */
1033
proc = proc->next;
1034
919
continue;
1035
920
}
1036
921
/* Before reading, make the process' data buffer large enough */
1037
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1038
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
924
+ (size_t) BUFFER_SIZE);
1040
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1041
926
perror("malloc");
1042
927
exitstatus = EXIT_FAILURE;
1043
928
goto fallback;
1045
930
proc->buffer_size += BUFFER_SIZE;
1046
931
}
1047
932
/* Read from the process */
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1050
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1051
936
/* Read error from this process; ignore the error */
1052
proc = proc->next;
1053
937
continue;
1054
938
}
1055
if(sret == 0){
939
if(ret == 0){
1056
940
/* got EOF */
1057
941
proc->eof = true;
1058
942
} else {
1059
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1060
944
}
1061
945
}
1062
946
}
1063
1064
947
948
1065
949
fallback:
1066
950
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1068
952
/* Fallback if all plugins failed, none are found or an error
1069
953
occured */
1070
954
bool bret;
1071
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1072
956
char *passwordbuffer = getpass("Password: ");
1073
size_t len = strlen(passwordbuffer);
1074
/* Strip trailing newline */
1075
if(len > 0 and passwordbuffer[len-1] == '\n'){
1076
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1077
len--;
1078
}
1079
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1080
958
if(not bret){
1081
959
perror("print_out_password");
1082
960
exitstatus = EXIT_FAILURE;
1089
967
perror("sigaction");
1090
968
exitstatus = EXIT_FAILURE;
1091
969
}
1092
970
1093
971
if(custom_argv != NULL){
1094
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1095
973
free(*arg);
1096
974
}
1097
975
free(custom_argv);
1098
976
}
977
free_plugin_list(plugin_list);
1099
978
1100
979
if(dir != NULL){
1101
980
closedir(dir);
1102
981
}
1103
982
1104
/* Kill the processes */
1105
for(plugin *p = plugin_list; p != NULL; p = p->next){
1106
if(p->pid != 0){
1107
close(p->fd);
1108
ret = kill(p->pid, SIGTERM);
1109
if(ret == -1 and errno != ESRCH){
1110
/* Set-uid proccesses might not get closed */
1111
perror("kill");
1112
}
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");
1113
991
}
992
free(process_list->buffer);
993
free(process_list);
1114
994
}
1115
995
1116
996
/* Wait for any remaining child processes to terminate */
1120
1000
if(errno != ECHILD){
1121
1001
perror("wait");
1122
1002
}
1123
1124
free_plugin_list();
1125
1003
1126
1004
free(plugindir);
1127
1005
free(argfile);
1128
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0