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- Committer: Teddy Hogeborn
- Date: 2008-09-01 08:29:23 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901082923-i2liq6t7warmu9xe
* mandos.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
- 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
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
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 */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
72
66
73
67
#define BUFFER_SIZE 256
74
68
75
69
#define PDIR "/lib/mandos/plugins.d"
76
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
71
78
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
79
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
80
74
75
struct plugin;
76
81
77
typedef struct plugin{
82
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char *name; /* can be NULL or any plugin name */
83
79
char **argv;
85
81
char **environ;
86
82
int envc;
87
83
bool disabled;
88
84
89
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/* Variables used for running processes*/
90
86
pid_t pid;
91
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int fd;
93
89
size_t buffer_size;
94
90
size_t buffer_length;
95
91
bool eof;
96
volatile sig_atomic_t completed;
97
int status;
92
volatile bool completed;
93
volatile int status;
98
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struct plugin *next;
99
95
} plugin;
100
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101
97
static plugin *plugin_list = NULL;
102
98
103
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
104
100
or if none is found, creates a new one */
105
101
static plugin *getplugin(char *name){
106
/* Check for existing plugin with that name */
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
if((p->name == name)
109
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
110
106
return p;
111
107
}
112
108
}
113
109
/* Create a new plugin */
114
plugin *new_plugin = NULL;
115
do {
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
118
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
112
return NULL;
120
113
}
121
114
char *copy_name = NULL;
122
115
if(name != NULL){
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
126
117
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
130
118
return NULL;
131
119
}
132
120
}
133
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
138
139
do {
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
142
if(new_plugin->argv == NULL){
143
int e = errno;
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){
144
129
free(copy_name);
145
130
free(new_plugin);
146
errno = e;
147
131
return NULL;
148
132
}
149
133
new_plugin->argv[0] = copy_name;
150
134
new_plugin->argv[1] = NULL;
151
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
135
136
new_plugin->environ = malloc(sizeof(char *));
155
137
if(new_plugin->environ == NULL){
156
int e = errno;
157
138
free(copy_name);
158
139
free(new_plugin->argv);
159
140
free(new_plugin);
160
errno = e;
161
141
return NULL;
162
142
}
163
143
new_plugin->environ[0] = NULL;
164
144
165
145
/* Append the new plugin to the list */
166
146
plugin_list = new_plugin;
167
147
return new_plugin;
171
151
static bool add_to_char_array(const char *new, char ***array,
172
152
int *len){
173
153
/* Resize the pointed-to array to hold one more pointer */
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
178
156
/* Malloc check */
179
157
if(*array == NULL){
180
158
return false;
181
159
}
182
160
/* Make a copy of the new string */
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
187
162
if(copy == NULL){
188
163
return false;
189
164
}
204
179
}
205
180
206
181
/* Add to a plugin's environment */
207
static bool add_environment(plugin *p, const char *def, bool replace){
182
static bool add_environment(plugin *p, const char *def){
208
183
if(p == NULL){
209
184
return false;
210
185
}
211
/* namelen = length of name of environment variable */
212
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
216
/* It already exists */
217
if(replace){
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
222
if(new == NULL){
223
return false;
224
}
225
*e = new;
226
strcpy(*e, def);
227
}
228
return true;
229
}
230
}
231
186
return add_to_char_array(def, &(p->environ), &(p->envc));
232
187
}
233
188
234
189
/*
235
190
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
191
* Descriptor Flags".
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
193
*/
239
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
241
197
/* If reading the flags failed, return error indication now. */
242
198
if(ret < 0){
243
199
return ret;
244
200
}
245
201
/* Store modified flag word in the descriptor. */
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
248
203
}
249
204
250
205
251
206
/* Mark processes as completed when they exit, and save their exit
252
207
status. */
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
208
void handle_sigchld(__attribute__((unused)) int sig){
255
209
while(true){
256
210
plugin *proc = plugin_list;
257
211
int status;
261
215
break;
262
216
}
263
217
if(pid == -1){
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
218
if (errno != ECHILD){
219
perror("waitpid");
267
220
}
268
perror("waitpid");
221
/* No child processes */
222
break;
269
223
}
270
224
271
225
/* A child exited, find it in process_list */
272
226
while(proc != NULL and proc->pid != pid){
273
227
proc = proc->next;
277
231
continue;
278
232
}
279
233
proc->status = status;
280
proc->completed = 1;
234
proc->completed = true;
281
235
}
282
errno = old_errno;
283
236
}
284
237
285
238
/* Prints out a password to stdout */
286
static bool print_out_password(const char *buffer, size_t length){
239
bool print_out_password(const char *buffer, size_t length){
287
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
288
244
for(size_t written = 0; written < length; written += (size_t)ret){
289
245
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
290
246
length - written));
307
263
}
308
264
free(plugin_node->environ);
309
265
free(plugin_node->buffer);
310
266
311
267
/* Removes the plugin from the singly-linked list */
312
268
if(plugin_node == plugin_list){
313
269
/* First one - simple */
341
297
struct stat st;
342
298
fd_set rfds_all;
343
299
int ret, maxfd = 0;
344
ssize_t sret;
345
300
uid_t uid = 65534;
346
301
gid_t gid = 65534;
347
302
bool debug = false;
372
327
{ .name = "global-options", .key = 'g',
373
328
.arg = "OPTION[,OPTION[,...]]",
374
329
.doc = "Options passed to all plugins" },
375
{ .name = "global-env", .key = 'G',
330
{ .name = "global-envs", .key = 'e',
376
331
.arg = "VAR=value",
377
332
.doc = "Environment variable passed to all plugins" },
378
333
{ .name = "options-for", .key = 'o',
379
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
380
335
.doc = "Options passed only to specified plugin" },
381
{ .name = "env-for", .key = 'E',
336
{ .name = "envs-for", .key = 'f',
382
337
.arg = "PLUGIN:ENV=value",
383
338
.doc = "Environment variable passed to specified plugin" },
384
339
{ .name = "disable", .key = 'd',
385
340
.arg = "PLUGIN",
386
341
.doc = "Disable a specific plugin", .group = 1 },
387
{ .name = "enable", .key = 'e',
388
.arg = "PLUGIN",
389
.doc = "Enable a specific plugin", .group = 1 },
390
342
{ .name = "plugin-dir", .key = 128,
391
343
.arg = "DIRECTORY",
392
344
.doc = "Specify a different plugin directory", .group = 2 },
401
353
.doc = "Group ID the plugins will run as", .group = 3 },
402
354
{ .name = "debug", .key = 132,
403
355
.doc = "Debug mode", .group = 4 },
404
/*
405
* These reproduce what we would get without ARGP_NO_HELP
406
*/
407
{ .name = "help", .key = '?',
408
.doc = "Give this help list", .group = -1 },
409
{ .name = "usage", .key = -3,
410
.doc = "Give a short usage message", .group = -1 },
411
{ .name = "version", .key = 'V',
412
.doc = "Print program version", .group = -1 },
413
356
{ .name = NULL }
414
357
};
415
358
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
errno = 0;
418
switch(key){
419
char *tmp;
420
intmax_t tmpmax;
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
361
/* Get the INPUT argument from `argp_parse', which we know is a
362
pointer to our plugin list pointer. */
363
switch (key) {
421
364
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
422
382
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
427
}
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
428
389
}
429
390
}
430
391
break;
431
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
433
break;
434
392
case 'o': /* --options-for */
435
{
436
char *option_list = strchr(arg, ':');
437
if(option_list == NULL){
438
argp_error(state, "No colon in \"%s\"", arg);
439
errno = EINVAL;
440
break;
441
}
442
*option_list = '\0';
443
option_list++;
444
if(arg[0] == '\0'){
445
argp_error(state, "Empty plugin name");
446
errno = EINVAL;
447
break;
448
}
449
char *option;
450
while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
452
break;
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
453
412
}
454
413
}
455
414
}
456
415
break;
457
case 'E': /* --env-for */
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
458
420
{
459
421
char *envdef = strchr(arg, ':');
460
422
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*envdef = '\0';
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
466
429
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
430
if(not add_environment(getplugin(p_name), envdef)){
431
perror("add_environment");
471
432
}
472
add_environment(getplugin(arg), envdef, true);
473
433
}
474
434
break;
475
435
case 'd': /* --disable */
476
{
477
plugin *p = getplugin(arg);
478
if(p != NULL){
479
p->disabled = true;
480
}
481
}
482
break;
483
case 'e': /* --enable */
484
{
485
plugin *p = getplugin(arg);
486
if(p != NULL){
487
p->disabled = false;
488
}
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
489
442
}
490
443
break;
491
444
case 128: /* --plugin-dir */
492
free(plugindir);
493
445
plugindir = strdup(arg);
446
if(plugindir == NULL){
447
perror("strdup");
448
}
494
449
break;
495
450
case 129: /* --config-file */
496
/* This is already done by parse_opt_config_file() */
497
break;
451
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
454
}
455
break;
498
456
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
500
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
502
argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
504
break;
505
}
506
uid = (uid_t)tmpmax;
457
uid = (uid_t)strtol(arg, NULL, 10);
507
458
break;
508
459
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
510
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
512
argp_error(state, "Bad group ID number: \"%s\", using %"
513
PRIdMAX, arg, (intmax_t)gid);
514
break;
515
}
516
gid = (gid_t)tmpmax;
460
gid = (gid_t)strtol(arg, NULL, 10);
517
461
break;
518
462
case 132: /* --debug */
519
463
debug = true;
520
464
break;
521
/*
522
* These reproduce what we would get without ARGP_NO_HELP
523
*/
524
case '?': /* --help */
525
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
527
case -3: /* --usage */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
532
fprintf(state->out_stream, "%s\n", argp_program_version);
533
exit(EXIT_SUCCESS);
534
break;
535
/*
536
* When adding more options before this line, remember to also add a
537
* "case" to the "parse_opt_config_file" function below.
538
*/
539
case ARGP_KEY_ARG:
540
/* Cryptsetup always passes an argument, which is an empty
541
string if "none" was specified in /etc/crypttab. So if
542
argument was empty, we ignore it silently. */
543
if(arg[0] == '\0'){
544
break;
545
}
546
default:
547
return ARGP_ERR_UNKNOWN;
548
}
549
return errno; /* Set to 0 at start */
550
}
551
552
/* This option parser is the same as parse_opt() above, except it
553
ignores everything but the --config-file option. */
554
error_t parse_opt_config_file(int key, char *arg,
555
__attribute__((unused))
556
struct argp_state *state){
557
errno = 0;
558
switch(key){
559
case 'g': /* --global-options */
560
case 'G': /* --global-env */
561
case 'o': /* --options-for */
562
case 'E': /* --env-for */
563
case 'd': /* --disable */
564
case 'e': /* --enable */
565
case 128: /* --plugin-dir */
566
break;
567
case 129: /* --config-file */
568
free(argfile);
569
argfile = strdup(arg);
570
break;
571
case 130: /* --userid */
572
case 131: /* --groupid */
573
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
577
case ARGP_KEY_ARG:
578
break;
579
default:
580
return ARGP_ERR_UNKNOWN;
581
}
582
return errno;
583
}
584
585
struct argp argp = { .options = options,
586
.parser = parse_opt_config_file,
587
.args_doc = "",
465
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
467
break;
468
case ARGP_KEY_END:
469
break;
470
default:
471
return ARGP_ERR_UNKNOWN;
472
}
473
return 0;
474
}
475
476
struct argp argp = { .options = options, .parser = parse_opt,
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
588
478
.doc = "Mandos plugin runner -- Run plugins" };
589
479
590
/* Parse using parse_opt_config_file() in order to get the custom
591
config file location, if any. */
592
ret = argp_parse(&argp, argc, argv,
593
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
594
NULL, NULL);
595
switch(ret){
596
case 0:
597
break;
598
case ENOMEM:
599
default:
600
errno = ret;
601
perror("argp_parse");
602
exitstatus = EX_OSERR;
603
goto fallback;
604
case EINVAL:
605
exitstatus = EX_USAGE;
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
481
if (ret == ARGP_ERR_UNKNOWN){
482
fprintf(stderr, "Unknown error while parsing arguments\n");
483
exitstatus = EXIT_FAILURE;
606
484
goto fallback;
607
485
}
608
609
/* Reset to the normal argument parser */
610
argp.parser = parse_opt;
611
612
/* Open the configfile if available */
613
if(argfile == NULL){
486
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
614
489
conffp = fopen(AFILE, "r");
615
490
} else {
616
491
conffp = fopen(argfile, "r");
617
}
492
}
618
493
if(conffp != NULL){
619
494
char *org_line = NULL;
620
495
char *p, *arg, *new_arg, *line;
621
496
size_t size = 0;
497
ssize_t sret;
622
498
const char whitespace_delims[] = " \r\t\f\v\n";
623
499
const char comment_delim[] = "#";
624
500
625
501
custom_argc = 1;
626
502
custom_argv = malloc(sizeof(char*) * 2);
627
503
if(custom_argv == NULL){
631
507
}
632
508
custom_argv[0] = argv[0];
633
509
custom_argv[1] = NULL;
634
510
635
511
/* for each line in the config file, strip whitespace and ignore
636
512
commented text */
637
513
while(true){
639
515
if(sret == -1){
640
516
break;
641
517
}
642
518
643
519
line = org_line;
644
520
arg = strsep(&line, comment_delim);
645
521
while((p = strsep(&arg, whitespace_delims)) != NULL){
664
540
goto fallback;
665
541
}
666
542
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
543
custom_argv[custom_argc] = NULL;
668
544
}
669
545
}
670
do {
671
ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
673
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
546
free(org_line);
679
} else {
547
} else{
680
548
/* Check for harmful errors and go to fallback. Other errors might
681
549
not affect opening plugins */
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
551
perror("fopen");
684
552
exitstatus = EXIT_FAILURE;
685
553
goto fallback;
686
554
}
687
555
}
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
690
558
if(custom_argv != NULL){
691
ret = argp_parse(&argp, custom_argc, custom_argv,
692
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
693
NULL, NULL);
694
switch(ret){
695
case 0:
696
break;
697
case ENOMEM:
698
default:
699
errno = ret;
700
perror("argp_parse");
701
exitstatus = EX_OSERR;
702
goto fallback;
703
case EINVAL:
704
exitstatus = EX_CONFIG;
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
560
if (ret == ARGP_ERR_UNKNOWN){
561
fprintf(stderr, "Unknown error while parsing arguments\n");
562
exitstatus = EXIT_FAILURE;
705
563
goto fallback;
706
564
}
707
565
}
708
566
709
/* Parse actual command line arguments, to let them override the
710
config file */
711
ret = argp_parse(&argp, argc, argv,
712
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
713
NULL, NULL);
714
switch(ret){
715
case 0:
716
break;
717
case ENOMEM:
718
default:
719
errno = ret;
720
perror("argp_parse");
721
exitstatus = EX_OSERR;
722
goto fallback;
723
case EINVAL:
724
exitstatus = EX_USAGE;
725
goto fallback;
726
}
727
728
567
if(debug){
729
568
for(plugin *p = plugin_list; p != NULL; p=p->next){
730
569
fprintf(stderr, "Plugin: %s has %d arguments\n",
732
571
for(char **a = p->argv; *a != NULL; a++){
733
572
fprintf(stderr, "\tArg: %s\n", *a);
734
573
}
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
575
for(char **a = p->environ; *a != NULL; a++){
737
576
fprintf(stderr, "\t%s\n", *a);
738
577
}
739
578
}
740
579
}
741
580
742
581
/* Strip permissions down to nobody */
582
ret = setuid(uid);
583
if (ret == -1){
584
perror("setuid");
585
}
743
586
setgid(gid);
744
if(ret == -1){
587
if (ret == -1){
745
588
perror("setgid");
746
589
}
747
ret = setuid(uid);
748
if(ret == -1){
749
perror("setuid");
750
}
751
752
/* Open plugin directory with close_on_exec flag */
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
596
597
if(dir == NULL){
598
perror("Could not open plugin dir");
599
exitstatus = EXIT_FAILURE;
600
goto fallback;
601
}
602
603
/* Set the FD_CLOEXEC flag on the directory, if possible */
753
604
{
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
772
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
775
goto fallback;
776
}
777
778
#ifndef O_CLOEXEC
779
/* Set the FD_CLOEXEC flag on the directory */
780
ret = set_cloexec_flag(dir_fd);
781
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
785
goto fallback;
786
}
787
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
605
int dir_fd = dirfd(dir);
606
if(dir_fd >= 0){
607
ret = set_cloexec_flag(dir_fd);
608
if(ret < 0){
609
perror("set_cloexec_flag");
610
exitstatus = EXIT_FAILURE;
611
goto fallback;
612
}
795
613
}
796
614
}
797
615
798
616
FD_ZERO(&rfds_all);
799
617
800
618
/* Read and execute any executable in the plugin directory*/
801
619
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
620
dirst = readdir(dir);
805
621
806
/* All directory entries have been processed */
622
// All directory entries have been processed
807
623
if(dirst == NULL){
808
if(errno == EBADF){
624
if (errno == EBADF){
809
625
perror("readdir");
810
626
exitstatus = EXIT_FAILURE;
811
627
goto fallback;
815
631
816
632
d_name_len = strlen(dirst->d_name);
817
633
818
/* Ignore dotfiles, backup files and other junk */
634
// Ignore dotfiles, backup files and other junk
819
635
{
820
636
bool bad_name = false;
821
637
823
639
824
640
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
641
".dpkg-old",
826
".dpkg-bak",
827
642
".dpkg-divert", NULL };
828
643
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
644
size_t pre_len = strlen(*pre);
858
673
continue;
859
674
}
860
675
}
861
676
862
677
char *filename;
863
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
866
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
870
}
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
679
if(ret < 0){
872
680
perror("asprintf");
873
681
continue;
874
682
}
875
683
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
684
ret = stat(filename, &st);
685
if (ret == -1){
878
686
perror("stat");
879
687
free(filename);
880
688
continue;
881
689
}
882
690
883
691
/* Ignore non-executable files */
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
886
693
if(debug){
887
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
695
" with bad type or mode\n", filename);
916
723
}
917
724
/* Add global environment variables */
918
725
for(char **e = g->environ; *e != NULL; e++){
919
if(not add_environment(p, *e, false)){
726
if(not add_environment(p, *e)){
920
727
perror("add_environment");
921
728
}
922
729
}
927
734
process, too. */
928
735
if(p->environ[0] != NULL){
929
736
for(char **e = environ; *e != NULL; e++){
930
if(not add_environment(p, *e, false)){
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
931
743
perror("add_environment");
932
744
}
933
745
}
934
746
}
935
747
936
748
int pipefd[2];
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
749
ret = pipe(pipefd);
750
if (ret == -1){
939
751
perror("pipe");
940
752
exitstatus = EXIT_FAILURE;
941
753
goto fallback;
954
766
goto fallback;
955
767
}
956
768
/* Block SIGCHLD until process is safely in process list */
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
769
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
770
if(ret < 0){
961
771
perror("sigprocmask");
962
772
exitstatus = EXIT_FAILURE;
963
773
goto fallback;
964
774
}
965
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
775
// Starting a new process to be watched
776
pid_t pid = fork();
970
777
if(pid == -1){
971
778
perror("fork");
972
779
exitstatus = EXIT_FAILURE;
979
786
perror("sigaction");
980
787
_exit(EXIT_FAILURE);
981
788
}
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
789
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
790
if(ret < 0){
984
791
perror("sigprocmask");
985
792
_exit(EXIT_FAILURE);
986
793
}
987
794
988
795
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
796
if(ret == -1){
990
797
perror("dup2");
1010
817
/* no return */
1011
818
}
1012
819
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
820
close(pipefd[1]); /* Close unused write end of pipe */
1015
821
free(filename);
1016
822
plugin *new_plugin = getplugin(dirst->d_name);
1017
if(new_plugin == NULL){
823
if (new_plugin == NULL){
1018
824
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
826
if(ret < 0){
1023
827
perror("sigprocmask");
1024
828
}
1031
835
1032
836
/* Unblock SIGCHLD so signal handler can be run if this process
1033
837
has already completed */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
839
if(ret < 0){
1038
840
perror("sigprocmask");
1039
841
exitstatus = EXIT_FAILURE;
1040
842
goto fallback;
1041
843
}
1042
844
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
845
FD_SET(new_plugin->fd, &rfds_all);
1045
846
1046
if(maxfd < new_plugin->fd){
847
if (maxfd < new_plugin->fd){
1047
848
maxfd = new_plugin->fd;
1048
849
}
850
1049
851
}
1050
852
1051
TEMP_FAILURE_RETRY(closedir(dir));
853
closedir(dir);
1052
854
dir = NULL;
1053
free_plugin(getplugin(NULL));
1054
855
1055
856
for(plugin *p = plugin_list; p != NULL; p = p->next){
1056
857
if(p->pid != 0){
1057
858
break;
1062
863
free_plugin_list();
1063
864
}
1064
865
}
1065
866
1066
867
/* Main loop while running plugins exist */
1067
868
while(plugin_list){
1068
869
fd_set rfds = rfds_all;
1069
870
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
if(select_ret == -1 and errno != EINTR){
871
if (select_ret == -1){
1071
872
perror("select");
1072
873
exitstatus = EXIT_FAILURE;
1073
874
goto fallback;
1074
875
}
1075
876
/* OK, now either a process completed, or something can be read
1076
877
from one of them */
1077
for(plugin *proc = plugin_list; proc != NULL;){
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1078
879
/* Is this process completely done? */
1079
if(proc->completed and proc->eof){
880
if(proc->eof and proc->completed){
1080
881
/* Only accept the plugin output if it exited cleanly */
1081
882
if(not WIFEXITED(proc->status)
1082
883
or WEXITSTATUS(proc->status) != 0){
1083
884
/* Bad exit by plugin */
1084
885
1085
886
if(debug){
1086
887
if(WIFEXITED(proc->status)){
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
888
fprintf(stderr, "Plugin %u exited with status %d\n",
889
(unsigned int) (proc->pid),
1090
890
WEXITSTATUS(proc->status));
1091
} else if(WIFSIGNALED(proc->status)){
1092
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
1094
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
891
} else if(WIFSIGNALED(proc->status)) {
892
fprintf(stderr, "Plugin %u killed by signal %d\n",
893
(unsigned int) (proc->pid),
894
WTERMSIG(proc->status));
1097
895
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
896
fprintf(stderr, "Plugin %d dumped core\n",
897
(unsigned int) (proc->pid));
1100
898
}
1101
899
}
1102
900
1103
901
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
902
FD_CLR(proc->fd, &rfds_all);
903
1107
904
/* Block signal while modifying process_list */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1112
906
if(ret < 0){
1113
907
perror("sigprocmask");
1114
908
exitstatus = EXIT_FAILURE;
1115
909
goto fallback;
1116
910
}
1117
1118
plugin *next_plugin = proc->next;
1119
911
free_plugin(proc);
1120
proc = next_plugin;
1121
1122
912
/* We are done modifying process list, so unblock signal */
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
914
NULL);
1126
915
if(ret < 0){
1127
916
perror("sigprocmask");
1128
917
exitstatus = EXIT_FAILURE;
1132
921
if(plugin_list == NULL){
1133
922
break;
1134
923
}
1135
1136
924
continue;
1137
925
}
1138
926
1139
927
/* This process exited nicely, so print its buffer */
1140
928
1141
929
bool bret = print_out_password(proc->buffer,
1142
930
proc->buffer_length);
1143
931
if(not bret){
1148
936
}
1149
937
1150
938
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
939
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
940
/* This process had nothing to say at this time */
1155
proc = proc->next;
1156
941
continue;
1157
942
}
1158
943
/* Before reading, make the process' data buffer large enough */
1159
944
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
945
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
946
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
947
if (proc->buffer == NULL){
1163
948
perror("malloc");
1164
949
exitstatus = EXIT_FAILURE;
1165
950
goto fallback;
1167
952
proc->buffer_size += BUFFER_SIZE;
1168
953
}
1169
954
/* Read from the process */
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1174
if(sret < 0){
955
ret = read(proc->fd, proc->buffer + proc->buffer_length,
956
BUFFER_SIZE);
957
if(ret < 0){
1175
958
/* Read error from this process; ignore the error */
1176
proc = proc->next;
1177
959
continue;
1178
960
}
1179
if(sret == 0){
961
if(ret == 0){
1180
962
/* got EOF */
1181
963
proc->eof = true;
1182
964
} else {
1183
proc->buffer_length += (size_t) sret;
965
proc->buffer_length += (size_t) ret;
1184
966
}
1185
967
}
1186
968
}
1187
1188
969
970
1189
971
fallback:
1190
972
1191
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
976
bool bret;
1195
977
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1196
978
char *passwordbuffer = getpass("Password: ");
1197
size_t len = strlen(passwordbuffer);
1198
/* Strip trailing newline */
1199
if(len > 0 and passwordbuffer[len-1] == '\n'){
1200
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1201
len--;
1202
}
1203
bret = print_out_password(passwordbuffer, len);
979
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1204
980
if(not bret){
1205
981
perror("print_out_password");
1206
982
exitstatus = EXIT_FAILURE;
1213
989
perror("sigaction");
1214
990
exitstatus = EXIT_FAILURE;
1215
991
}
1216
992
1217
993
if(custom_argv != NULL){
1218
994
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1219
995
free(*arg);
1225
1001
closedir(dir);
1226
1002
}
1227
1003
1228
/* Kill the processes */
1004
/* Free the process list and kill the processes */
1229
1005
for(plugin *p = plugin_list; p != NULL; p = p->next){
1230
1006
if(p->pid != 0){
1231
1007
close(p->fd);
1238
1014
}
1239
1015
1240
1016
/* Wait for any remaining child processes to terminate */
1241
do {
1017
do{
1242
1018
ret = wait(NULL);
1243
1019
} while(ret >= 0);
1244
1020
if(errno != ECHILD){
1245
1021
perror("wait");
1246
1022
}
1247
1023
1248
1024
free_plugin_list();
1249
1025
1250
1026
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0