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- Committer: Teddy Hogeborn
- Date: 2009-09-17 03:21:20 UTC
- Revision ID: teddy@fukt.bsnet.se-20090917032120-b4svwsceox2vx38q
* plugins.d/mandos-client.c (start_mandos_communication): Bug fix:
always free
"decrypted_buffer".
Default to
fail unless
success is
achieved.
always free
"decrypted_buffer".
Default to
fail unless
success is
achieved.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
66
71
67
72
#define BUFFER_SIZE 256
68
73
69
74
#define PDIR "/lib/mandos/plugins.d"
70
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
76
72
const char *argp_program_version = "plugin-runner 1.0";
77
const char *argp_program_version = "plugin-runner " VERSION;
73
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
79
75
struct plugin;
76
77
80
typedef struct plugin{
78
81
char *name; /* can be NULL or any plugin name */
79
82
char **argv;
81
84
char **environ;
82
85
int envc;
83
86
bool disabled;
84
87
85
88
/* Variables used for running processes*/
86
89
pid_t pid;
87
90
int fd;
89
92
size_t buffer_size;
90
93
size_t buffer_length;
91
94
bool eof;
92
volatile bool completed;
93
volatile int status;
95
volatile sig_atomic_t completed;
96
int status;
94
97
struct plugin *next;
95
98
} plugin;
96
99
97
100
static plugin *plugin_list = NULL;
98
101
99
/* Gets a existing plugin based on name,
102
/* Gets an existing plugin based on name,
100
103
or if none is found, creates a new one */
101
104
static plugin *getplugin(char *name){
102
105
/* 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
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))){
106
109
return p;
107
110
}
108
111
}
109
112
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
112
118
return NULL;
113
119
}
114
120
char *copy_name = NULL;
115
121
if(name != NULL){
116
copy_name = strdup(name);
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
117
125
if(copy_name == NULL){
126
free(new_plugin);
118
127
return NULL;
119
128
}
120
129
}
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){
130
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
135
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
129
140
free(copy_name);
130
141
free(new_plugin);
131
142
return NULL;
132
143
}
133
144
new_plugin->argv[0] = copy_name;
134
145
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
137
150
if(new_plugin->environ == NULL){
138
151
free(copy_name);
139
152
free(new_plugin->argv);
141
154
return NULL;
142
155
}
143
156
new_plugin->environ[0] = NULL;
144
157
145
158
/* Append the new plugin to the list */
146
159
plugin_list = new_plugin;
147
160
return new_plugin;
151
164
static bool add_to_char_array(const char *new, char ***array,
152
165
int *len){
153
166
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
156
171
/* Malloc check */
157
172
if(*array == NULL){
158
173
return false;
159
174
}
160
175
/* Make a copy of the new string */
161
char *copy = strdup(new);
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
162
180
if(copy == NULL){
163
181
return false;
164
182
}
179
197
}
180
198
181
199
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
200
static bool add_environment(plugin *p, const char *def, bool replace){
183
201
if(p == NULL){
184
202
return false;
185
203
}
204
/* namelen = length of name of environment variable */
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
209
/* It already exists */
210
if(replace){
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
216
return false;
217
}
218
*e = new;
219
strcpy(*e, def);
220
}
221
return true;
222
}
223
}
186
224
return add_to_char_array(def, &(p->environ), &(p->envc));
187
225
}
188
226
189
227
/*
190
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
229
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
193
231
*/
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
197
234
/* If reading the flags failed, return error indication now. */
198
235
if(ret < 0){
199
236
return ret;
200
237
}
201
238
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
203
241
}
204
242
205
243
206
244
/* Mark processes as completed when they exit, and save their exit
207
245
status. */
208
void handle_sigchld(__attribute__((unused)) int sig){
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
209
248
while(true){
210
249
plugin *proc = plugin_list;
211
250
int status;
215
254
break;
216
255
}
217
256
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
220
260
}
221
/* No child processes */
222
break;
261
perror("waitpid");
223
262
}
224
263
225
264
/* A child exited, find it in process_list */
226
265
while(proc != NULL and proc->pid != pid){
227
266
proc = proc->next;
231
270
continue;
232
271
}
233
272
proc->status = status;
234
proc->completed = true;
273
proc->completed = 1;
235
274
}
275
errno = old_errno;
236
276
}
237
277
238
278
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
279
static bool print_out_password(const char *buffer, size_t length){
240
280
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
281
for(size_t written = 0; written < length; written += (size_t)ret){
245
282
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
283
length - written));
263
300
}
264
301
free(plugin_node->environ);
265
302
free(plugin_node->buffer);
266
303
267
304
/* Removes the plugin from the singly-linked list */
268
305
if(plugin_node == plugin_list){
269
306
/* First one - simple */
297
334
struct stat st;
298
335
fd_set rfds_all;
299
336
int ret, maxfd = 0;
337
ssize_t sret;
300
338
uid_t uid = 65534;
301
339
gid_t gid = 65534;
302
340
bool debug = false;
327
365
{ .name = "global-options", .key = 'g',
328
366
.arg = "OPTION[,OPTION[,...]]",
329
367
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
368
{ .name = "global-env", .key = 'G',
331
369
.arg = "VAR=value",
332
370
.doc = "Environment variable passed to all plugins" },
333
371
{ .name = "options-for", .key = 'o',
334
372
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
373
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
374
{ .name = "env-for", .key = 'E',
337
375
.arg = "PLUGIN:ENV=value",
338
376
.doc = "Environment variable passed to specified plugin" },
339
377
{ .name = "disable", .key = 'd',
340
378
.arg = "PLUGIN",
341
379
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
342
383
{ .name = "plugin-dir", .key = 128,
343
384
.arg = "DIRECTORY",
344
385
.doc = "Specify a different plugin directory", .group = 2 },
356
397
{ .name = NULL }
357
398
};
358
399
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) {
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
402
switch(key){
403
char *tmp;
404
intmax_t tmpmax;
363
405
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
406
if(arg != NULL){
407
char *plugin_option;
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
368
410
continue;
369
411
}
370
if(not add_argument(getplugin(NULL), p)){
412
if(not add_argument(getplugin(NULL), plugin_option)){
371
413
perror("add_argument");
372
414
return ARGP_ERR_UNKNOWN;
373
415
}
374
416
}
375
417
}
376
418
break;
377
case 'e': /* --global-envs */
419
case 'G': /* --global-env */
378
420
if(arg == NULL){
379
421
break;
380
422
}
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
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
389
425
}
390
426
break;
391
427
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
}
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
411
438
}
412
439
}
413
440
}
414
441
break;
415
case 'f': /* --envs-for */
442
case 'E': /* --env-for */
416
443
if(arg == NULL){
417
444
break;
418
445
}
421
448
if(envdef == NULL){
422
449
break;
423
450
}
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)){
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
430
453
perror("add_environment");
431
454
}
432
455
}
433
456
break;
434
457
case 'd': /* --disable */
435
if (arg != NULL){
458
if(arg != NULL){
436
459
plugin *p = getplugin(arg);
437
460
if(p == NULL){
438
461
return ARGP_ERR_UNKNOWN;
440
463
p->disabled = true;
441
464
}
442
465
break;
466
case 'e': /* --enable */
467
if(arg != NULL){
468
plugin *p = getplugin(arg);
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
471
}
472
p->disabled = false;
473
}
474
break;
443
475
case 128: /* --plugin-dir */
476
free(plugindir);
444
477
plugindir = strdup(arg);
445
478
if(plugindir == NULL){
446
479
perror("strdup");
447
}
448
break;
449
case 129: /* --config-file */
480
}
481
break;
482
case 129: /* --config-file */
483
/* This is already done by parse_opt_config_file() */
484
break;
485
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
494
}
495
break;
496
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
505
}
506
break;
507
case 132: /* --debug */
508
debug = true;
509
break;
510
/*
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
513
*/
514
case ARGP_KEY_ARG:
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
/* This option parser is the same as parse_opt() above, except it
531
ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
535
switch(key){
536
case 'g': /* --global-options */
537
case 'G': /* --global-env */
538
case 'o': /* --options-for */
539
case 'E': /* --env-for */
540
case 'd': /* --disable */
541
case 'e': /* --enable */
542
case 128: /* --plugin-dir */
543
break;
544
case 129: /* --config-file */
545
free(argfile);
450
546
argfile = strdup(arg);
451
547
if(argfile == NULL){
452
548
perror("strdup");
453
549
}
454
break;
550
break;
455
551
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
457
break;
458
552
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
460
break;
461
553
case 132: /* --debug */
462
debug = true;
463
break;
464
554
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
466
break;
467
555
case ARGP_KEY_END:
468
556
break;
469
557
default:
472
560
return 0;
473
561
}
474
562
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
563
struct argp argp = { .options = options,
564
.parser = parse_opt_config_file,
565
.args_doc = "",
477
566
.doc = "Mandos plugin runner -- Run plugins" };
478
567
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
568
/* Parse using parse_opt_config_file() in order to get the custom
569
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
481
572
fprintf(stderr, "Unknown error while parsing arguments\n");
482
573
exitstatus = EXIT_FAILURE;
483
574
goto fallback;
484
575
}
485
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
576
577
/* Reset to the normal argument parser */
578
argp.parser = parse_opt;
579
580
/* Open the configfile if available */
581
if(argfile == NULL){
488
582
conffp = fopen(AFILE, "r");
489
583
} else {
490
584
conffp = fopen(argfile, "r");
491
}
585
}
492
586
if(conffp != NULL){
493
587
char *org_line = NULL;
494
588
char *p, *arg, *new_arg, *line;
495
589
size_t size = 0;
496
ssize_t sret;
497
590
const char whitespace_delims[] = " \r\t\f\v\n";
498
591
const char comment_delim[] = "#";
499
592
500
593
custom_argc = 1;
501
594
custom_argv = malloc(sizeof(char*) * 2);
502
595
if(custom_argv == NULL){
506
599
}
507
600
custom_argv[0] = argv[0];
508
601
custom_argv[1] = NULL;
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
602
603
/* for each line in the config file, strip whitespace and ignore
604
commented text */
511
605
while(true){
512
606
sret = getline(&org_line, &size, conffp);
513
607
if(sret == -1){
514
608
break;
515
609
}
516
610
517
611
line = org_line;
518
612
arg = strsep(&line, comment_delim);
519
613
while((p = strsep(&arg, whitespace_delims)) != NULL){
538
632
goto fallback;
539
633
}
540
634
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
635
custom_argv[custom_argc] = NULL;
542
636
}
543
637
}
638
do {
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
641
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
644
goto fallback;
645
}
544
646
free(org_line);
545
} else{
647
} else {
546
648
/* Check for harmful errors and go to fallback. Other errors might
547
649
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
651
perror("fopen");
550
652
exitstatus = EXIT_FAILURE;
551
653
goto fallback;
554
656
/* If there was any arguments from configuration file,
555
657
pass them to parser as command arguments */
556
658
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
559
662
fprintf(stderr, "Unknown error while parsing arguments\n");
560
663
exitstatus = EXIT_FAILURE;
561
664
goto fallback;
562
665
}
563
666
}
564
667
668
/* Parse actual command line arguments, to let them override the
669
config file */
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
674
goto fallback;
675
}
676
565
677
if(debug){
566
678
for(plugin *p = plugin_list; p != NULL; p=p->next){
567
679
fprintf(stderr, "Plugin: %s has %d arguments\n",
569
681
for(char **a = p->argv; *a != NULL; a++){
570
682
fprintf(stderr, "\tArg: %s\n", *a);
571
683
}
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
573
685
for(char **a = p->environ; *a != NULL; a++){
574
686
fprintf(stderr, "\t%s\n", *a);
575
687
}
576
688
}
577
689
}
578
690
579
691
/* Strip permissions down to nobody */
692
setgid(gid);
693
if(ret == -1){
694
perror("setgid");
695
}
580
696
ret = setuid(uid);
581
if (ret == -1){
697
if(ret == -1){
582
698
perror("setuid");
583
}
584
setgid(gid);
585
if (ret == -1){
586
perror("setgid");
587
699
}
588
589
if (plugindir == NULL){
700
701
if(plugindir == NULL){
590
702
dir = opendir(PDIR);
591
703
} else {
592
704
dir = opendir(plugindir);
612
724
}
613
725
614
726
FD_ZERO(&rfds_all);
615
727
616
728
/* Read and execute any executable in the plugin directory*/
617
729
while(true){
618
dirst = readdir(dir);
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
619
733
620
// All directory entries have been processed
734
/* All directory entries have been processed */
621
735
if(dirst == NULL){
622
if (errno == EBADF){
736
if(errno == EBADF){
623
737
perror("readdir");
624
738
exitstatus = EXIT_FAILURE;
625
739
goto fallback;
629
743
630
744
d_name_len = strlen(dirst->d_name);
631
745
632
// Ignore dotfiles, backup files and other junk
746
/* Ignore dotfiles, backup files and other junk */
633
747
{
634
748
bool bad_name = false;
635
749
637
751
638
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
639
753
".dpkg-old",
754
".dpkg-bak",
640
755
".dpkg-divert", NULL };
641
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
642
757
size_t pre_len = strlen(*pre);
671
786
continue;
672
787
}
673
788
}
674
789
675
790
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
793
dirst->d_name));
794
} else {
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
796
plugindir,
797
dirst->d_name));
798
}
677
799
if(ret < 0){
678
800
perror("asprintf");
679
801
continue;
680
802
}
681
803
682
ret = stat(filename, &st);
683
if (ret == -1){
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
684
806
perror("stat");
685
807
free(filename);
686
808
continue;
687
809
}
688
810
689
811
/* Ignore non-executable files */
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
691
814
if(debug){
692
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
693
816
" with bad type or mode\n", filename);
721
844
}
722
845
/* Add global environment variables */
723
846
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
847
if(not add_environment(p, *e, false)){
725
848
perror("add_environment");
726
849
}
727
850
}
732
855
process, too. */
733
856
if(p->environ[0] != NULL){
734
857
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)){
858
if(not add_environment(p, *e, false)){
741
859
perror("add_environment");
742
860
}
743
861
}
744
862
}
745
863
746
864
int pipefd[2];
747
ret = pipe(pipefd);
748
if (ret == -1){
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
749
867
perror("pipe");
750
868
exitstatus = EXIT_FAILURE;
751
869
goto fallback;
764
882
goto fallback;
765
883
}
766
884
/* Block SIGCHLD until process is safely in process list */
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
887
NULL));
768
888
if(ret < 0){
769
889
perror("sigprocmask");
770
890
exitstatus = EXIT_FAILURE;
771
891
goto fallback;
772
892
}
773
// Starting a new process to be watched
774
pid_t pid = fork();
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
775
898
if(pid == -1){
776
899
perror("fork");
777
900
exitstatus = EXIT_FAILURE;
784
907
perror("sigaction");
785
908
_exit(EXIT_FAILURE);
786
909
}
787
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
788
911
if(ret < 0){
789
912
perror("sigprocmask");
790
913
_exit(EXIT_FAILURE);
791
914
}
792
915
793
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
794
917
if(ret == -1){
795
918
perror("dup2");
815
938
/* no return */
816
939
}
817
940
/* Parent process */
818
close(pipefd[1]); /* Close unused write end of pipe */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
819
943
free(filename);
820
944
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
945
if(new_plugin == NULL){
822
946
perror("getplugin");
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
949
NULL)));
824
950
if(ret < 0){
825
951
perror("sigprocmask");
826
952
}
833
959
834
960
/* Unblock SIGCHLD so signal handler can be run if this process
835
961
has already completed */
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
837
965
if(ret < 0){
838
966
perror("sigprocmask");
839
967
exitstatus = EXIT_FAILURE;
842
970
843
971
FD_SET(new_plugin->fd, &rfds_all);
844
972
845
if (maxfd < new_plugin->fd){
973
if(maxfd < new_plugin->fd){
846
974
maxfd = new_plugin->fd;
847
975
}
848
849
976
}
850
977
851
closedir(dir);
978
TEMP_FAILURE_RETRY(closedir(dir));
852
979
dir = NULL;
853
980
free_plugin(getplugin(NULL));
981
854
982
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
983
if(p->pid != 0){
856
984
break;
861
989
free_plugin_list();
862
990
}
863
991
}
864
992
865
993
/* Main loop while running plugins exist */
866
994
while(plugin_list){
867
995
fd_set rfds = rfds_all;
868
996
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
997
if(select_ret == -1 and errno != EINTR){
870
998
perror("select");
871
999
exitstatus = EXIT_FAILURE;
872
1000
goto fallback;
873
1001
}
874
1002
/* OK, now either a process completed, or something can be read
875
1003
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1004
for(plugin *proc = plugin_list; proc != NULL;){
877
1005
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
1006
if(proc->completed and proc->eof){
879
1007
/* Only accept the plugin output if it exited cleanly */
880
1008
if(not WIFEXITED(proc->status)
881
1009
or WEXITSTATUS(proc->status) != 0){
882
1010
/* Bad exit by plugin */
883
1011
884
1012
if(debug){
885
1013
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
888
1017
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));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
strsignal(WTERMSIG(proc->status)));
893
1024
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
896
1027
}
897
1028
}
898
1029
899
1030
/* Remove the plugin */
900
1031
FD_CLR(proc->fd, &rfds_all);
901
1032
902
1033
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1035
(SIG_BLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
904
1038
if(ret < 0){
905
1039
perror("sigprocmask");
906
1040
exitstatus = EXIT_FAILURE;
907
1041
goto fallback;
908
1042
}
1043
1044
plugin *next_plugin = proc->next;
909
1045
free_plugin(proc);
1046
proc = next_plugin;
1047
910
1048
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
NULL);
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
913
1052
if(ret < 0){
914
1053
perror("sigprocmask");
915
1054
exitstatus = EXIT_FAILURE;
919
1058
if(plugin_list == NULL){
920
1059
break;
921
1060
}
1061
922
1062
continue;
923
1063
}
924
1064
925
1065
/* This process exited nicely, so print its buffer */
926
1066
927
1067
bool bret = print_out_password(proc->buffer,
928
1068
proc->buffer_length);
929
1069
if(not bret){
936
1076
/* This process has not completed. Does it have any output? */
937
1077
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
938
1078
/* This process had nothing to say at this time */
1079
proc = proc->next;
939
1080
continue;
940
1081
}
941
1082
/* Before reading, make the process' data buffer large enough */
942
1083
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
943
1084
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
1085
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
1086
if(proc->buffer == NULL){
946
1087
perror("malloc");
947
1088
exitstatus = EXIT_FAILURE;
948
1089
goto fallback;
950
1091
proc->buffer_size += BUFFER_SIZE;
951
1092
}
952
1093
/* Read from the process */
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
954
BUFFER_SIZE);
955
if(ret < 0){
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1095
proc->buffer
1096
+ proc->buffer_length,
1097
BUFFER_SIZE));
1098
if(sret < 0){
956
1099
/* Read error from this process; ignore the error */
1100
proc = proc->next;
957
1101
continue;
958
1102
}
959
if(ret == 0){
1103
if(sret == 0){
960
1104
/* got EOF */
961
1105
proc->eof = true;
962
1106
} else {
963
proc->buffer_length += (size_t) ret;
1107
proc->buffer_length += (size_t) sret;
964
1108
}
965
1109
}
966
1110
}
967
968
1111
1112
969
1113
fallback:
970
1114
971
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
974
1118
bool bret;
975
1119
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
1120
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1121
size_t len = strlen(passwordbuffer);
1122
/* Strip trailing newline */
1123
if(len > 0 and passwordbuffer[len-1] == '\n'){
1124
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1125
len--;
1126
}
1127
bret = print_out_password(passwordbuffer, len);
978
1128
if(not bret){
979
1129
perror("print_out_password");
980
1130
exitstatus = EXIT_FAILURE;
987
1137
perror("sigaction");
988
1138
exitstatus = EXIT_FAILURE;
989
1139
}
990
1140
991
1141
if(custom_argv != NULL){
992
1142
for(char **arg = custom_argv+1; *arg != NULL; arg++){
993
1143
free(*arg);
999
1149
closedir(dir);
1000
1150
}
1001
1151
1002
/* Free the process list and kill the processes */
1152
/* Kill the processes */
1003
1153
for(plugin *p = plugin_list; p != NULL; p = p->next){
1004
1154
if(p->pid != 0){
1005
1155
close(p->fd);
1012
1162
}
1013
1163
1014
1164
/* Wait for any remaining child processes to terminate */
1015
do{
1165
do {
1016
1166
ret = wait(NULL);
1017
1167
} while(ret >= 0);
1018
1168
if(errno != ECHILD){
1019
1169
perror("wait");
1020
1170
}
1021
1171
1022
1172
free_plugin_list();
1023
1173
1024
1174
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0