To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 123
- compare with another revision
- download diff
- download tarball
- view history from revision 123
- Committer: Teddy Hogeborn
- Date: 2008-08-31 08:47:38 UTC
- Revision ID: teddy@fukt.bsnet.se-20080831084738-uu70kayyt876982d
* mandos-keygen: Minor help text change.
* mandos-keygen.xml: Changed plural "keys" to singular "key"
throughout.
(NAME): Improved wording.
(DESCRIPTION): Improved wording.
(OPTIONS): Split options in <term> tags into separate <term> tags.
Use <option> tags. Move long options before short
options. Uppercase replaceables.
(OVERVIEW): Improved wording.
(EXIT STATUS): Also cover --password option.
(EXAMPLE): Add two examples using the --password option.
(SECURITY): Improved wording.
* overview.xml: Improved wording.
* mandos-keygen.xml: Changed plural "keys" to singular "key"
throughout.
(NAME): Improved wording.
(DESCRIPTION): Improved wording.
(OPTIONS): Split options in <term> tags into separate <term> tags.
Use <option> tags. Move long options before short
options. Uppercase replaceables.
(OVERVIEW): Improved wording.
(EXIT STATUS): Also cover --password option.
(EXAMPLE): Add two examples using the --password option.
(SECURITY): Improved wording.
* overview.xml: 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,
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, PRIdMAX, strtoimax() */
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
314
274
struct stat st;
315
275
fd_set rfds_all;
316
276
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
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
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
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'){
390
346
continue;
391
347
}
392
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
393
349
perror("add_argument");
394
350
return ARGP_ERR_UNKNOWN;
395
351
}
396
352
}
397
353
}
398
354
break;
399
case 'G': /* --global-env */
355
case 'e':
400
356
if(arg == NULL){
401
357
break;
402
358
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
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
}
405
367
}
406
368
break;
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
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
}
418
389
}
419
390
}
420
391
}
421
392
break;
422
case 'E': /* --env-for */
393
case 'f':
423
394
if(arg == NULL){
424
395
break;
425
396
}
428
399
if(envdef == NULL){
429
400
break;
430
401
}
431
*envdef = '\0';
432
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)){
433
408
perror("add_environment");
434
409
}
435
410
}
436
411
break;
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
440
415
if(p == NULL){
441
416
return ARGP_ERR_UNKNOWN;
442
417
}
443
418
p->disabled = true;
444
419
}
445
420
break;
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
421
case 128:
457
422
plugindir = strdup(arg);
458
423
if(plugindir == NULL){
459
424
perror("strdup");
460
425
}
461
426
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
488
debug = true;
489
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
427
case 129:
526
428
argfile = strdup(arg);
527
429
if(argfile == NULL){
528
430
perror("strdup");
529
431
}
530
432
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
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;
534
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
535
445
case ARGP_KEY_END:
536
446
break;
537
447
default:
540
450
return 0;
541
451
}
542
452
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
546
457
.doc = "Mandos plugin runner -- Run plugins" };
547
458
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
552
461
fprintf(stderr, "Unknown error while parsing arguments\n");
553
462
exitstatus = EXIT_FAILURE;
554
463
goto fallback;
555
464
}
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
465
466
if (argfile == NULL){
562
467
conffp = fopen(AFILE, "r");
563
468
} else {
564
469
conffp = fopen(argfile, "r");
565
}
470
}
471
566
472
if(conffp != NULL){
567
473
char *org_line = NULL;
568
474
char *p, *arg, *new_arg, *line;
569
475
size_t size = 0;
476
ssize_t sret;
570
477
const char whitespace_delims[] = " \r\t\f\v\n";
571
478
const char comment_delim[] = "#";
572
479
573
480
custom_argc = 1;
574
481
custom_argv = malloc(sizeof(char*) * 2);
575
482
if(custom_argv == NULL){
580
487
custom_argv[0] = argv[0];
581
488
custom_argv[1] = NULL;
582
489
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
585
490
while(true){
586
491
sret = getline(&org_line, &size, conffp);
587
492
if(sret == -1){
588
493
break;
589
494
}
590
495
591
496
line = org_line;
592
497
arg = strsep(&line, comment_delim);
593
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
616
521
}
617
522
}
618
523
free(org_line);
619
} else {
524
} else{
620
525
/* Check for harmful errors and go to fallback. Other errors might
621
526
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
528
perror("fopen");
624
529
exitstatus = EXIT_FAILURE;
625
530
goto fallback;
626
531
}
627
532
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
533
630
534
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
634
537
fprintf(stderr, "Unknown error while parsing arguments\n");
635
538
exitstatus = EXIT_FAILURE;
636
539
goto fallback;
637
540
}
638
541
}
639
542
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
649
543
if(debug){
650
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
547
for(char **a = p->argv; *a != NULL; a++){
654
548
fprintf(stderr, "\tArg: %s\n", *a);
655
549
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
551
for(char **a = p->environ; *a != NULL; a++){
658
552
fprintf(stderr, "\t%s\n", *a);
659
553
}
660
554
}
661
555
}
662
556
663
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
664
562
setgid(gid);
665
if(ret == -1){
563
if (ret == -1){
666
564
perror("setgid");
667
565
}
668
ret = setuid(uid);
669
if(ret == -1){
670
perror("setuid");
671
}
672
673
if(plugindir == NULL){
566
567
if (plugindir == NULL){
674
568
dir = opendir(PDIR);
675
569
} else {
676
570
dir = opendir(plugindir);
697
591
698
592
FD_ZERO(&rfds_all);
699
593
700
/* Read and execute any executable in the plugin directory*/
701
594
while(true){
702
595
dirst = readdir(dir);
703
596
704
/* All directory entries have been processed */
597
// All directory entries have been processed
705
598
if(dirst == NULL){
706
if(errno == EBADF){
599
if (errno == EBADF){
707
600
perror("readdir");
708
601
exitstatus = EXIT_FAILURE;
709
602
goto fallback;
713
606
714
607
d_name_len = strlen(dirst->d_name);
715
608
716
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
717
610
{
718
611
bool bad_name = false;
719
612
721
614
722
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
616
".dpkg-old",
724
".dpkg-bak",
725
617
".dpkg-divert", NULL };
726
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
619
size_t pre_len = strlen(*pre);
735
627
break;
736
628
}
737
629
}
630
738
631
if(bad_name){
739
632
continue;
740
633
}
634
741
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
636
size_t suf_len = strlen(*suf);
743
637
if((d_name_len >= suf_len)
756
650
continue;
757
651
}
758
652
}
759
653
760
654
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
656
if(ret < 0){
767
657
perror("asprintf");
768
658
continue;
769
659
}
770
660
771
661
ret = stat(filename, &st);
772
if(ret == -1){
662
if (ret == -1){
773
663
perror("stat");
774
664
free(filename);
775
665
continue;
776
666
}
777
667
778
/* Ignore non-executable files */
779
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)){
780
669
if(debug){
781
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
671
" with bad type or mode\n", filename);
784
673
free(filename);
785
674
continue;
786
675
}
787
788
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
677
if(p == NULL){
790
678
perror("getplugin");
791
679
free(filename);
801
689
}
802
690
{
803
691
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
805
693
if(g != NULL){
806
694
for(char **a = g->argv + 1; *a != NULL; a++){
807
695
if(not add_argument(p, *a)){
810
698
}
811
699
/* Add global environment variables */
812
700
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
701
if(not add_environment(p, *e)){
814
702
perror("add_environment");
815
703
}
816
704
}
821
709
process, too. */
822
710
if(p->environ[0] != NULL){
823
711
for(char **e = environ; *e != NULL; e++){
824
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)){
825
718
perror("add_environment");
826
719
}
827
720
}
829
722
830
723
int pipefd[2];
831
724
ret = pipe(pipefd);
832
if(ret == -1){
725
if (ret == -1){
833
726
perror("pipe");
834
727
exitstatus = EXIT_FAILURE;
835
728
goto fallback;
836
729
}
837
/* Ask OS to automatic close the pipe on exec */
838
730
ret = set_cloexec_flag(pipefd[0]);
839
731
if(ret < 0){
840
732
perror("set_cloexec_flag");
848
740
goto fallback;
849
741
}
850
742
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
744
if(ret < 0){
853
745
perror("sigprocmask");
854
746
exitstatus = EXIT_FAILURE;
855
747
goto fallback;
856
748
}
857
/* Starting a new process to be watched */
749
// Starting a new process to be watched
858
750
pid_t pid = fork();
859
751
if(pid == -1){
860
752
perror("fork");
868
760
perror("sigaction");
869
761
_exit(EXIT_FAILURE);
870
762
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
764
if(ret < 0){
873
765
perror("sigprocmask");
874
766
_exit(EXIT_FAILURE);
875
767
}
876
768
877
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
770
if(ret == -1){
879
771
perror("dup2");
898
790
}
899
791
/* no return */
900
792
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
793
/* parent process */
903
794
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
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);
908
800
if(ret < 0){
909
perror("sigprocmask");
801
perror("sigprocmask");
910
802
}
911
803
exitstatus = EXIT_FAILURE;
912
804
goto fallback;
913
805
}
914
806
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
918
812
/* Unblock SIGCHLD so signal handler can be run if this process
919
813
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
815
if(ret < 0){
922
816
perror("sigprocmask");
923
817
exitstatus = EXIT_FAILURE;
924
818
goto fallback;
925
819
}
926
820
927
FD_SET(new_plugin->fd, &rfds_all);
821
FD_SET(new_process->fd, &rfds_all);
928
822
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
931
825
}
826
932
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
933
831
934
832
closedir(dir);
935
833
dir = NULL;
936
free_plugin(getplugin(NULL));
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
947
839
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
840
while(process_list){
951
841
fd_set rfds = rfds_all;
952
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
843
if (select_ret == -1){
954
844
perror("select");
955
845
exitstatus = EXIT_FAILURE;
956
846
goto fallback;
957
847
}
958
848
/* OK, now either a process completed, or something can be read
959
849
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
961
851
/* Is this process completely done? */
962
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
963
853
/* Only accept the plugin output if it exited cleanly */
964
854
if(not WIFEXITED(proc->status)
965
855
or WEXITSTATUS(proc->status) != 0){
966
856
/* Bad exit by plugin */
967
968
857
if(debug){
969
858
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
973
861
WEXITSTATUS(proc->status));
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(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),
978
865
WTERMSIG(proc->status));
979
866
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
982
869
}
983
870
}
984
985
871
/* Remove the plugin */
986
872
FD_CLR(proc->fd, &rfds_all);
987
988
873
/* Block signal while modifying process_list */
989
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
990
875
if(ret < 0){
992
877
exitstatus = EXIT_FAILURE;
993
878
goto fallback;
994
879
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
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
}
1000
893
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1003
896
if(ret < 0){
1004
897
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
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;
1014
905
}
1015
1016
906
/* This process exited nicely, so print its buffer */
1017
907
1018
908
bool bret = print_out_password(proc->buffer,
1019
909
proc->buffer_length);
1020
910
if(not bret){
1023
913
}
1024
914
goto fallback;
1025
915
}
1026
1027
916
/* This process has not completed. Does it have any output? */
1028
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1029
918
/* This process had nothing to say at this time */
1030
proc = proc->next;
1031
919
continue;
1032
920
}
1033
921
/* Before reading, make the process' data buffer large enough */
1034
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
924
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
925
if (proc->buffer == NULL){
1038
926
perror("malloc");
1039
927
exitstatus = EXIT_FAILURE;
1040
928
goto fallback;
1042
930
proc->buffer_size += BUFFER_SIZE;
1043
931
}
1044
932
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1048
936
/* Read error from this process; ignore the error */
1049
proc = proc->next;
1050
937
continue;
1051
938
}
1052
if(sret == 0){
939
if(ret == 0){
1053
940
/* got EOF */
1054
941
proc->eof = true;
1055
942
} else {
1056
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1057
944
}
1058
945
}
1059
946
}
1060
1061
947
948
1062
949
fallback:
1063
950
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1065
952
/* Fallback if all plugins failed, none are found or an error
1066
953
occured */
1067
954
bool bret;
1068
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
956
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1077
958
if(not bret){
1078
959
perror("print_out_password");
1079
960
exitstatus = EXIT_FAILURE;
1086
967
perror("sigaction");
1087
968
exitstatus = EXIT_FAILURE;
1088
969
}
1089
970
1090
971
if(custom_argv != NULL){
1091
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1092
973
free(*arg);
1093
974
}
1094
975
free(custom_argv);
1095
976
}
977
free_plugin_list(plugin_list);
1096
978
1097
979
if(dir != NULL){
1098
980
closedir(dir);
1099
981
}
1100
982
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
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");
1110
991
}
992
free(process_list->buffer);
993
free(process_list);
1111
994
}
1112
995
1113
996
/* Wait for any remaining child processes to terminate */
1117
1000
if(errno != ECHILD){
1118
1001
perror("wait");
1119
1002
}
1120
1121
free_plugin_list();
1122
1003
1123
1004
free(plugindir);
1124
1005
free(argfile);
1125
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0