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- Committer: Björn Påhlsson
- Date: 2008-08-31 16:03:21 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 132.
- Revision ID: belorn@braxen-20080831160321-fgvlw43uu6qz7k06
Rearranged so plugins and processes is the same thing
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugin-runner.c
1
#include <stdio.h> /* popen, fileno */
2
#include <iso646.h> /* and, or, not */
3
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
4
WIFEXITED, WEXITSTATUS, wait */
5
#include <sys/wait.h> /* wait */
6
#include <dirent.h> /* DIR, opendir */
7
#include <sys/stat.h> /* stat, struct stat */
8
#include <unistd.h> /* stat, struct stat, chdir */
9
#include <stdlib.h> /* EXIT_FAILURE */
10
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET, FD_ISSET */
11
#include <string.h> /* strlen, strcpy, strcat */
12
#include <stdbool.h> /* true */
13
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
14
#include <errno.h> /* errno */
15
16
struct process;
17
18
typedef struct process{
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Mandos plugin runner - Run Mandos plugins
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
* General Public License for more details.
16
*
17
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
20
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
*/
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
19
86
pid_t pid;
20
87
int fd;
21
88
char *buffer;
22
int buffer_size;
23
int buffer_length;
24
struct process *next;
25
} process;
26
27
#define BUFFER_SIZE 256
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
94
struct plugin *next;
95
} plugin;
96
97
static plugin *plugin_list = NULL;
98
99
/* Gets a existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
106
return p;
107
}
108
}
109
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
132
}
133
new_plugin->argv[0] = copy_name;
134
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
145
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
147
return new_plugin;
148
}
149
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
183
if(p == NULL){
184
return false;
185
}
186
return add_to_char_array(def, &(p->environ), &(p->envc));
187
}
188
189
/*
190
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
193
*/
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
197
/* If reading the flags failed, return error indication now. */
198
if(ret < 0){
199
return ret;
200
}
201
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
203
}
204
205
206
/* Mark processes as completed when they exit, and save their exit
207
status. */
208
void handle_sigchld(__attribute__((unused)) int sig){
209
while(true){
210
plugin *proc = plugin_list;
211
int status;
212
pid_t pid = waitpid(-1, &status, WNOHANG);
213
if(pid == 0){
214
/* Only still running child processes */
215
break;
216
}
217
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
220
}
221
/* No child processes */
222
break;
223
}
224
225
/* A child exited, find it in process_list */
226
while(proc != NULL and proc->pid != pid){
227
proc = proc->next;
228
}
229
if(proc == NULL){
230
/* Process not found in process list */
231
continue;
232
}
233
proc->status = status;
234
proc->completed = true;
235
}
236
}
237
238
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
for(size_t written = 0; written < length; written += (size_t)ret){
245
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
length - written));
247
if(ret < 0){
248
return false;
249
}
250
}
251
return true;
252
}
253
254
/* Removes and free a plugin from the plugin list */
255
static void free_plugin(plugin *plugin_node){
256
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
258
free(*arg);
259
}
260
free(plugin_node->argv);
261
for(char **env = plugin_node->environ; *env != NULL; env++){
262
free(*env);
263
}
264
free(plugin_node->environ);
265
free(plugin_node->buffer);
266
267
/* Removes the plugin from the singly-linked list */
268
if(plugin_node == plugin_list){
269
/* First one - simple */
270
plugin_list = plugin_list->next;
271
} else {
272
/* Second one or later */
273
for(plugin *p = plugin_list; p != NULL; p = p->next){
274
if(p->next == plugin_node){
275
p->next = plugin_node->next;
276
break;
277
}
278
}
279
}
280
281
free(plugin_node);
282
}
283
284
static void free_plugin_list(void){
285
while(plugin_list != NULL){
286
free_plugin(plugin_list);
287
}
288
}
28
289
29
290
int main(int argc, char *argv[]){
30
char plugindir[] = "plugins.d";
31
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
32
DIR *dir;
291
char *plugindir = NULL;
292
char *argfile = NULL;
293
FILE *conffp;
294
size_t d_name_len;
295
DIR *dir = NULL;
33
296
struct dirent *dirst;
34
297
struct stat st;
35
fd_set rfds_orig;
298
fd_set rfds_all;
36
299
int ret, maxfd = 0;
37
process *process_list = NULL;
38
39
dir = opendir(plugindir);
40
300
uid_t uid = 65534;
301
gid_t gid = 65534;
302
bool debug = false;
303
int exitstatus = EXIT_SUCCESS;
304
struct sigaction old_sigchld_action;
305
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
306
.sa_flags = SA_NOCLDSTOP };
307
char **custom_argv = NULL;
308
int custom_argc = 0;
309
310
/* Establish a signal handler */
311
sigemptyset(&sigchld_action.sa_mask);
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
if(ret == -1){
314
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
317
}
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
if(ret == -1){
320
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
323
}
324
325
/* The options we understand. */
326
struct argp_option options[] = {
327
{ .name = "global-options", .key = 'g',
328
.arg = "OPTION[,OPTION[,...]]",
329
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
331
.arg = "VAR=value",
332
.doc = "Environment variable passed to all plugins" },
333
{ .name = "options-for", .key = 'o',
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
337
.arg = "PLUGIN:ENV=value",
338
.doc = "Environment variable passed to specified plugin" },
339
{ .name = "disable", .key = 'd',
340
.arg = "PLUGIN",
341
.doc = "Disable a specific plugin", .group = 1 },
342
{ .name = "plugin-dir", .key = 128,
343
.arg = "DIRECTORY",
344
.doc = "Specify a different plugin directory", .group = 2 },
345
{ .name = "config-file", .key = 129,
346
.arg = "FILE",
347
.doc = "Specify a different configuration file", .group = 2 },
348
{ .name = "userid", .key = 130,
349
.arg = "ID", .flags = 0,
350
.doc = "User ID the plugins will run as", .group = 3 },
351
{ .name = "groupid", .key = 131,
352
.arg = "ID", .flags = 0,
353
.doc = "Group ID the plugins will run as", .group = 3 },
354
{ .name = "debug", .key = 132,
355
.doc = "Debug mode", .group = 4 },
356
{ .name = NULL }
357
};
358
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
362
switch (key) {
363
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
368
continue;
369
}
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
373
}
374
}
375
}
376
break;
377
case 'e': /* --global-envs */
378
if(arg == NULL){
379
break;
380
}
381
{
382
char *envdef = strdup(arg);
383
if(envdef == NULL){
384
break;
385
}
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
388
}
389
}
390
break;
391
case 'o': /* --options-for */
392
if (arg != NULL){
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
395
break;
396
}
397
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
399
break;
400
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
411
}
412
}
413
}
414
break;
415
case 'f': /* --envs-for */
416
if(arg == NULL){
417
break;
418
}
419
{
420
char *envdef = strchr(arg, ':');
421
if(envdef == NULL){
422
break;
423
}
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
425
if(p_name == NULL){
426
break;
427
}
428
envdef++;
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
431
}
432
}
433
break;
434
case 'd': /* --disable */
435
if (arg != NULL){
436
plugin *p = getplugin(arg);
437
if(p == NULL){
438
return ARGP_ERR_UNKNOWN;
439
}
440
p->disabled = true;
441
}
442
break;
443
case 128: /* --plugin-dir */
444
plugindir = strdup(arg);
445
if(plugindir == NULL){
446
perror("strdup");
447
}
448
break;
449
case 129: /* --config-file */
450
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
453
}
454
break;
455
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
457
break;
458
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
460
break;
461
case 132: /* --debug */
462
debug = true;
463
break;
464
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
466
break;
467
case ARGP_KEY_END:
468
break;
469
default:
470
return ARGP_ERR_UNKNOWN;
471
}
472
return 0;
473
}
474
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
477
.doc = "Mandos plugin runner -- Run plugins" };
478
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
485
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
488
conffp = fopen(AFILE, "r");
489
} else {
490
conffp = fopen(argfile, "r");
491
}
492
if(conffp != NULL){
493
char *org_line = NULL;
494
char *p, *arg, *new_arg, *line;
495
size_t size = 0;
496
ssize_t sret;
497
const char whitespace_delims[] = " \r\t\f\v\n";
498
const char comment_delim[] = "#";
499
500
custom_argc = 1;
501
custom_argv = malloc(sizeof(char*) * 2);
502
if(custom_argv == NULL){
503
perror("malloc");
504
exitstatus = EXIT_FAILURE;
505
goto fallback;
506
}
507
custom_argv[0] = argv[0];
508
custom_argv[1] = NULL;
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
511
while(true){
512
sret = getline(&org_line, &size, conffp);
513
if(sret == -1){
514
break;
515
}
516
517
line = org_line;
518
arg = strsep(&line, comment_delim);
519
while((p = strsep(&arg, whitespace_delims)) != NULL){
520
if(p[0] == '\0'){
521
continue;
522
}
523
new_arg = strdup(p);
524
if(new_arg == NULL){
525
perror("strdup");
526
exitstatus = EXIT_FAILURE;
527
free(org_line);
528
goto fallback;
529
}
530
531
custom_argc += 1;
532
custom_argv = realloc(custom_argv, sizeof(char *)
533
* ((unsigned int) custom_argc + 1));
534
if(custom_argv == NULL){
535
perror("realloc");
536
exitstatus = EXIT_FAILURE;
537
free(org_line);
538
goto fallback;
539
}
540
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
542
}
543
}
544
free(org_line);
545
} else{
546
/* Check for harmful errors and go to fallback. Other errors might
547
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
perror("fopen");
550
exitstatus = EXIT_FAILURE;
551
goto fallback;
552
}
553
}
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
556
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
exitstatus = EXIT_FAILURE;
561
goto fallback;
562
}
563
}
564
565
if(debug){
566
for(plugin *p = plugin_list; p != NULL; p=p->next){
567
fprintf(stderr, "Plugin: %s has %d arguments\n",
568
p->name ? p->name : "Global", p->argc - 1);
569
for(char **a = p->argv; *a != NULL; a++){
570
fprintf(stderr, "\tArg: %s\n", *a);
571
}
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
573
for(char **a = p->environ; *a != NULL; a++){
574
fprintf(stderr, "\t%s\n", *a);
575
}
576
}
577
}
578
579
/* Strip permissions down to nobody */
580
ret = setuid(uid);
581
if (ret == -1){
582
perror("setuid");
583
}
584
setgid(gid);
585
if (ret == -1){
586
perror("setgid");
587
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
594
41
595
if(dir == NULL){
42
fprintf(stderr, "Can not open directory\n");
43
return EXIT_FAILURE;
44
}
45
46
FD_ZERO(&rfds_orig);
47
596
perror("Could not open plugin dir");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
602
{
603
int dir_fd = dirfd(dir);
604
if(dir_fd >= 0){
605
ret = set_cloexec_flag(dir_fd);
606
if(ret < 0){
607
perror("set_cloexec_flag");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
610
}
611
}
612
}
613
614
FD_ZERO(&rfds_all);
615
616
/* Read and execute any executable in the plugin directory*/
48
617
while(true){
49
618
dirst = readdir(dir);
50
619
51
620
// All directory entries have been processed
52
621
if(dirst == NULL){
622
if (errno == EBADF){
623
perror("readdir");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
53
627
break;
54
628
}
55
629
56
630
d_name_len = strlen(dirst->d_name);
57
631
58
// Ignore dotfiles and backup files
59
if (dirst->d_name[0] == '.'
60
or dirst->d_name[d_name_len - 1] == '~'){
61
continue;
62
}
63
64
char *filename = malloc(d_name_len + plugindir_len + 2);
65
strcpy(filename, plugindir);
66
strcat(filename, "/");
67
strcat(filename, dirst->d_name);
68
69
stat(filename, &st);
70
71
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
72
// Starting a new process to be watched
73
process *new_process = malloc(sizeof(process));
74
int pipefd[2];
75
pipe(pipefd);
76
new_process->pid = fork();
77
if(new_process->pid == 0){
78
/* this is the child process */
632
// Ignore dotfiles, backup files and other junk
633
{
634
bool bad_name = false;
635
636
const char const *bad_prefixes[] = { ".", "#", NULL };
637
638
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
639
".dpkg-old",
640
".dpkg-divert", NULL };
641
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
642
size_t pre_len = strlen(*pre);
643
if((d_name_len >= pre_len)
644
and strncmp((dirst->d_name), *pre, pre_len) == 0){
645
if(debug){
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad prefix %s\n", dirst->d_name, *pre);
648
}
649
bad_name = true;
650
break;
651
}
652
}
653
if(bad_name){
654
continue;
655
}
656
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
size_t suf_len = strlen(*suf);
658
if((d_name_len >= suf_len)
659
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
660
== 0)){
661
if(debug){
662
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
663
" with bad suffix %s\n", dirst->d_name, *suf);
664
}
665
bad_name = true;
666
break;
667
}
668
}
669
670
if(bad_name){
671
continue;
672
}
673
}
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
679
continue;
680
}
681
682
ret = stat(filename, &st);
683
if (ret == -1){
684
perror("stat");
685
free(filename);
686
continue;
687
}
688
689
/* Ignore non-executable files */
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
691
if(debug){
692
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
693
" with bad type or mode\n", filename);
694
}
695
free(filename);
696
continue;
697
}
698
699
plugin *p = getplugin(dirst->d_name);
700
if(p == NULL){
701
perror("getplugin");
702
free(filename);
703
continue;
704
}
705
if(p->disabled){
706
if(debug){
707
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
708
dirst->d_name);
709
}
710
free(filename);
711
continue;
712
}
713
{
714
/* Add global arguments to argument list for this plugin */
715
plugin *g = getplugin(NULL);
716
if(g != NULL){
717
for(char **a = g->argv + 1; *a != NULL; a++){
718
if(not add_argument(p, *a)){
719
perror("add_argument");
720
}
721
}
722
/* Add global environment variables */
723
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
725
perror("add_environment");
726
}
727
}
728
}
729
}
730
/* If this plugin has any environment variables, we will call
731
using execve and need to duplicate the environment from this
732
process, too. */
733
if(p->environ[0] != NULL){
734
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
741
perror("add_environment");
742
}
743
}
744
}
745
746
int pipefd[2];
747
ret = pipe(pipefd);
748
if (ret == -1){
749
perror("pipe");
750
exitstatus = EXIT_FAILURE;
751
goto fallback;
752
}
753
/* Ask OS to automatic close the pipe on exec */
754
ret = set_cloexec_flag(pipefd[0]);
755
if(ret < 0){
756
perror("set_cloexec_flag");
757
exitstatus = EXIT_FAILURE;
758
goto fallback;
759
}
760
ret = set_cloexec_flag(pipefd[1]);
761
if(ret < 0){
762
perror("set_cloexec_flag");
763
exitstatus = EXIT_FAILURE;
764
goto fallback;
765
}
766
/* Block SIGCHLD until process is safely in process list */
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
768
if(ret < 0){
769
perror("sigprocmask");
770
exitstatus = EXIT_FAILURE;
771
goto fallback;
772
}
773
// Starting a new process to be watched
774
pid_t pid = fork();
775
if(pid == -1){
776
perror("fork");
777
exitstatus = EXIT_FAILURE;
778
goto fallback;
779
}
780
if(pid == 0){
781
/* this is the child process */
782
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
783
if(ret < 0){
784
perror("sigaction");
785
_exit(EXIT_FAILURE);
786
}
787
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
788
if(ret < 0){
789
perror("sigprocmask");
790
_exit(EXIT_FAILURE);
791
}
792
793
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
794
if(ret == -1){
795
perror("dup2");
796
_exit(EXIT_FAILURE);
797
}
798
799
if(dirfd(dir) < 0){
800
/* If dir has no file descriptor, we could not set FD_CLOEXEC
801
above and must now close it manually here. */
79
802
closedir(dir);
80
close(pipefd[0]); /* close unused read end of pipe */
81
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
82
/* create a new modified argument list */
83
char **new_argv = malloc(sizeof(char *) * (argc + 1));
84
new_argv[0] = filename;
85
for(int i = 1; i < argc; i++){
86
new_argv[i] = argv[i];
87
}
88
new_argv[argc] = NULL;
89
if(execv(filename, new_argv) < 0){
90
perror(argv[0]);
91
close(pipefd[1]);
92
exit(EXIT_FAILURE);
93
}
94
/* no return */
95
}
96
close(pipefd[1]); /* close unused write end of pipe */
97
new_process->fd = pipefd[0];
98
new_process->buffer = malloc(BUFFER_SIZE);
99
if (new_process->buffer == NULL){
100
perror(argv[0]);
101
goto end;
102
}
103
new_process->buffer_size = BUFFER_SIZE;
104
new_process->buffer_length = 0;
105
FD_SET(new_process->fd, &rfds_orig);
106
107
if (maxfd < new_process->fd){
108
maxfd = new_process->fd;
109
}
110
111
//List handling
112
new_process->next = process_list;
113
process_list = new_process;
114
}
803
}
804
if(p->environ[0] == NULL){
805
if(execv(filename, p->argv) < 0){
806
perror("execv");
807
_exit(EXIT_FAILURE);
808
}
809
} else {
810
if(execve(filename, p->argv, p->environ) < 0){
811
perror("execve");
812
_exit(EXIT_FAILURE);
813
}
814
}
815
/* no return */
816
}
817
/* Parent process */
818
close(pipefd[1]); /* Close unused write end of pipe */
819
free(filename);
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
824
if(ret < 0){
825
perror("sigprocmask");
826
}
827
exitstatus = EXIT_FAILURE;
828
goto fallback;
829
}
830
831
new_plugin->pid = pid;
832
new_plugin->fd = pipefd[0];
833
834
/* Unblock SIGCHLD so signal handler can be run if this process
835
has already completed */
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
837
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
840
goto fallback;
841
}
842
843
FD_SET(new_plugin->fd, &rfds_all);
844
845
if (maxfd < new_plugin->fd){
846
maxfd = new_plugin->fd;
847
}
848
115
849
}
116
850
117
851
closedir(dir);
118
119
if (process_list != NULL){
120
while(true){
121
fd_set rfds = rfds_orig;
122
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
123
if (select_ret == -1){
124
perror(argv[0]);
125
goto end;
126
}else{
127
for(process *process_itr = process_list; process_itr != NULL;
128
process_itr = process_itr->next){
129
if(FD_ISSET(process_itr->fd, &rfds)){
130
if(process_itr->buffer_length + BUFFER_SIZE
131
> process_itr->buffer_size){
132
process_itr->buffer = realloc(process_itr->buffer,
133
process_itr->buffer_size
134
+ BUFFER_SIZE);
135
if (process_itr->buffer == NULL){
136
perror(argv[0]);
137
goto end;
138
}
139
process_itr->buffer_size += BUFFER_SIZE;
140
}
141
ret = read(process_itr->fd, process_itr->buffer
142
+ process_itr->buffer_length, BUFFER_SIZE);
143
process_itr->buffer_length+=ret;
144
if(ret == 0){
145
/* got EOF */
146
/* wait for process exit */
147
int status;
148
waitpid(process_itr->pid, &status, 0);
149
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
150
write(STDOUT_FILENO, process_itr->buffer,
151
process_itr->buffer_length);
152
goto end;
153
} else {
154
FD_CLR(process_itr->fd, &rfds_orig);
155
}
156
}
157
}
158
}
159
}
160
}
161
}
162
163
end:
164
for(process *process_itr = process_list; process_itr != NULL;
165
process_itr = process_itr->next){
166
close(process_itr->fd);
167
kill(process_itr->pid, SIGTERM);
168
free(process_itr->buffer);
169
}
170
171
while(true){
172
int status;
173
ret = wait(&status);
174
if (ret == -1){
175
if(errno != ECHILD){
176
perror("wait");
177
}
852
dir = NULL;
853
854
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
if(p->pid != 0){
178
856
break;
179
857
}
180
}
181
return EXIT_SUCCESS;
858
if(p->next == NULL){
859
fprintf(stderr, "No plugin processes started. Incorrect plugin"
860
" directory?\n");
861
free_plugin_list();
862
}
863
}
864
865
/* Main loop while running plugins exist */
866
while(plugin_list){
867
fd_set rfds = rfds_all;
868
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
870
perror("select");
871
exitstatus = EXIT_FAILURE;
872
goto fallback;
873
}
874
/* OK, now either a process completed, or something can be read
875
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
877
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
879
/* Only accept the plugin output if it exited cleanly */
880
if(not WIFEXITED(proc->status)
881
or WEXITSTATUS(proc->status) != 0){
882
/* Bad exit by plugin */
883
884
if(debug){
885
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
888
WEXITSTATUS(proc->status));
889
} else if(WIFSIGNALED(proc->status)) {
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
893
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
896
}
897
}
898
899
/* Remove the plugin */
900
FD_CLR(proc->fd, &rfds_all);
901
902
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
904
if(ret < 0){
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
907
goto fallback;
908
}
909
free_plugin(proc);
910
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
NULL);
913
if(ret < 0){
914
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
916
goto fallback;
917
}
918
919
if(plugin_list == NULL){
920
break;
921
}
922
continue;
923
}
924
925
/* This process exited nicely, so print its buffer */
926
927
bool bret = print_out_password(proc->buffer,
928
proc->buffer_length);
929
if(not bret){
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
932
}
933
goto fallback;
934
}
935
936
/* This process has not completed. Does it have any output? */
937
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
938
/* This process had nothing to say at this time */
939
continue;
940
}
941
/* Before reading, make the process' data buffer large enough */
942
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
943
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
946
perror("malloc");
947
exitstatus = EXIT_FAILURE;
948
goto fallback;
949
}
950
proc->buffer_size += BUFFER_SIZE;
951
}
952
/* Read from the process */
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
954
BUFFER_SIZE);
955
if(ret < 0){
956
/* Read error from this process; ignore the error */
957
continue;
958
}
959
if(ret == 0){
960
/* got EOF */
961
proc->eof = true;
962
} else {
963
proc->buffer_length += (size_t) ret;
964
}
965
}
966
}
967
968
969
fallback:
970
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
972
/* Fallback if all plugins failed, none are found or an error
973
occured */
974
bool bret;
975
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
978
if(not bret){
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
981
}
982
}
983
984
/* Restore old signal handler */
985
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
986
if(ret == -1){
987
perror("sigaction");
988
exitstatus = EXIT_FAILURE;
989
}
990
991
if(custom_argv != NULL){
992
for(char **arg = custom_argv+1; *arg != NULL; arg++){
993
free(*arg);
994
}
995
free(custom_argv);
996
}
997
998
if(dir != NULL){
999
closedir(dir);
1000
}
1001
1002
/* Free the process list and kill the processes */
1003
for(plugin *p = plugin_list; p != NULL; p = p->next){
1004
if(p->pid != 0){
1005
close(p->fd);
1006
ret = kill(p->pid, SIGTERM);
1007
if(ret == -1 and errno != ESRCH){
1008
/* Set-uid proccesses might not get closed */
1009
perror("kill");
1010
}
1011
}
1012
}
1013
1014
/* Wait for any remaining child processes to terminate */
1015
do{
1016
ret = wait(NULL);
1017
} while(ret >= 0);
1018
if(errno != ECHILD){
1019
perror("wait");
1020
}
1021
1022
free_plugin_list();
1023
1024
free(plugindir);
1025
free(argfile);
1026
1027
return exitstatus;
182
1028
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0