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- Committer: Teddy Hogeborn
- Date: 2009-10-30 16:22:31 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20091030162231-mpts7eygfkjmr4m5
* plugins.d/usplash.c: Use <sysexits.h> exit codes.
- 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
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* 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
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
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 */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
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
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
66
72
67
73
#define BUFFER_SIZE 256
68
74
69
75
#define PDIR "/lib/mandos/plugins.d"
70
76
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
77
72
const char *argp_program_version = "plugin-runner 1.0";
78
const char *argp_program_version = "plugin-runner " VERSION;
73
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
80
75
struct plugin;
76
77
81
typedef struct plugin{
78
82
char *name; /* can be NULL or any plugin name */
79
83
char **argv;
81
85
char **environ;
82
86
int envc;
83
87
bool disabled;
84
88
85
89
/* Variables used for running processes*/
86
90
pid_t pid;
87
91
int fd;
89
93
size_t buffer_size;
90
94
size_t buffer_length;
91
95
bool eof;
92
volatile bool completed;
93
volatile int status;
96
volatile sig_atomic_t completed;
97
int status;
94
98
struct plugin *next;
95
99
} plugin;
96
100
97
101
static plugin *plugin_list = NULL;
98
102
99
/* Gets a existing plugin based on name,
103
/* Gets an existing plugin based on name,
100
104
or if none is found, creates a new one */
101
105
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
/* 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))){
106
110
return p;
107
111
}
108
112
}
109
113
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
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){
112
119
return NULL;
113
120
}
114
121
char *copy_name = NULL;
115
122
if(name != NULL){
116
copy_name = strdup(name);
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
117
126
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
118
130
return NULL;
119
131
}
120
132
}
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){
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;
129
144
free(copy_name);
130
145
free(new_plugin);
146
errno = e;
131
147
return NULL;
132
148
}
133
149
new_plugin->argv[0] = copy_name;
134
150
new_plugin->argv[1] = NULL;
135
151
136
new_plugin->environ = malloc(sizeof(char *));
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
137
155
if(new_plugin->environ == NULL){
156
int e = errno;
138
157
free(copy_name);
139
158
free(new_plugin->argv);
140
159
free(new_plugin);
160
errno = e;
141
161
return NULL;
142
162
}
143
163
new_plugin->environ[0] = NULL;
151
171
static bool add_to_char_array(const char *new, char ***array,
152
172
int *len){
153
173
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
156
178
/* Malloc check */
157
179
if(*array == NULL){
158
180
return false;
159
181
}
160
182
/* Make a copy of the new string */
161
char *copy = strdup(new);
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
162
187
if(copy == NULL){
163
188
return false;
164
189
}
179
204
}
180
205
181
206
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
207
static bool add_environment(plugin *p, const char *def, bool replace){
183
208
if(p == NULL){
184
209
return false;
185
210
}
187
212
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
213
/* Search for this environment variable */
189
214
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* Refuse to add an existing variable */
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
}
192
228
return true;
193
229
}
194
230
}
198
234
/*
199
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
200
236
* Descriptor Flags".
201
* *Note File Descriptor Flags:(libc)Descriptor Flags.
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
202
238
*/
203
static int set_cloexec_flag(int fd)
204
{
205
int ret = fcntl(fd, F_GETFD, 0);
239
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
206
241
/* If reading the flags failed, return error indication now. */
207
242
if(ret < 0){
208
243
return ret;
209
244
}
210
245
/* Store modified flag word in the descriptor. */
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
212
248
}
213
249
214
250
215
251
/* Mark processes as completed when they exit, and save their exit
216
252
status. */
217
void handle_sigchld(__attribute__((unused)) int sig){
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
218
255
while(true){
219
256
plugin *proc = plugin_list;
220
257
int status;
224
261
break;
225
262
}
226
263
if(pid == -1){
227
if (errno != ECHILD){
228
perror("waitpid");
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
229
267
}
230
/* No child processes */
231
break;
268
perror("waitpid");
232
269
}
233
270
234
271
/* A child exited, find it in process_list */
235
272
while(proc != NULL and proc->pid != pid){
236
273
proc = proc->next;
240
277
continue;
241
278
}
242
279
proc->status = status;
243
proc->completed = true;
280
proc->completed = 1;
244
281
}
282
errno = old_errno;
245
283
}
246
284
247
285
/* Prints out a password to stdout */
248
bool print_out_password(const char *buffer, size_t length){
286
static bool print_out_password(const char *buffer, size_t length){
249
287
ssize_t ret;
250
if(length>0 and buffer[length-1] == '\n'){
251
length--;
252
}
253
288
for(size_t written = 0; written < length; written += (size_t)ret){
254
289
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
255
290
length - written));
272
307
}
273
308
free(plugin_node->environ);
274
309
free(plugin_node->buffer);
275
310
276
311
/* Removes the plugin from the singly-linked list */
277
312
if(plugin_node == plugin_list){
278
313
/* First one - simple */
306
341
struct stat st;
307
342
fd_set rfds_all;
308
343
int ret, maxfd = 0;
344
ssize_t sret;
309
345
uid_t uid = 65534;
310
346
gid_t gid = 65534;
311
347
bool debug = false;
336
372
{ .name = "global-options", .key = 'g',
337
373
.arg = "OPTION[,OPTION[,...]]",
338
374
.doc = "Options passed to all plugins" },
339
{ .name = "global-env", .key = 'e',
375
{ .name = "global-env", .key = 'G',
340
376
.arg = "VAR=value",
341
377
.doc = "Environment variable passed to all plugins" },
342
378
{ .name = "options-for", .key = 'o',
343
379
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
344
380
.doc = "Options passed only to specified plugin" },
345
{ .name = "env-for", .key = 'f',
381
{ .name = "env-for", .key = 'E',
346
382
.arg = "PLUGIN:ENV=value",
347
383
.doc = "Environment variable passed to specified plugin" },
348
384
{ .name = "disable", .key = 'd',
349
385
.arg = "PLUGIN",
350
386
.doc = "Disable a specific plugin", .group = 1 },
387
{ .name = "enable", .key = 'e',
388
.arg = "PLUGIN",
389
.doc = "Enable a specific plugin", .group = 1 },
351
390
{ .name = "plugin-dir", .key = 128,
352
391
.arg = "DIRECTORY",
353
392
.doc = "Specify a different plugin directory", .group = 2 },
362
401
.doc = "Group ID the plugins will run as", .group = 3 },
363
402
{ .name = "debug", .key = 132,
364
403
.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 },
365
413
{ .name = NULL }
366
414
};
367
415
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
370
/* Get the INPUT argument from `argp_parse', which we know is a
371
pointer to our plugin list pointer. */
372
switch (key) {
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;
373
421
case 'g': /* --global-options */
374
if (arg != NULL){
375
char *p;
376
while((p = strsep(&arg, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
break;
387
case 'e': /* --global-env */
388
if(arg == NULL){
389
break;
390
}
391
422
{
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
427
}
398
428
}
399
429
}
400
430
break;
431
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
433
break;
401
434
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0'){
409
break;
410
}
411
if(opt != NULL){
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
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;
421
453
}
422
454
}
423
455
}
424
456
break;
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
457
case 'E': /* --env-for */
429
458
{
430
459
char *envdef = strchr(arg, ':');
431
460
if(envdef == NULL){
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*envdef = '\0';
438
466
envdef++;
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
441
471
}
472
add_environment(getplugin(arg), envdef, true);
442
473
}
443
474
break;
444
475
case 'd': /* --disable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = true;
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
}
451
489
}
452
490
break;
453
491
case 128: /* --plugin-dir */
492
free(plugindir);
454
493
plugindir = strdup(arg);
455
if(plugindir == NULL){
456
perror("strdup");
457
}
458
break;
459
case 129: /* --config-file */
494
break;
495
case 129: /* --config-file */
496
/* This is already done by parse_opt_config_file() */
497
break;
498
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;
507
break;
508
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;
517
break;
518
case 132: /* --debug */
519
debug = true;
520
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);
460
569
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
463
}
464
break;
570
break;
465
571
case 130: /* --userid */
466
uid = (uid_t)strtol(arg, NULL, 10);
467
break;
468
572
case 131: /* --groupid */
469
gid = (gid_t)strtol(arg, NULL, 10);
470
break;
471
573
case 132: /* --debug */
472
debug = true;
473
break;
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
474
577
case ARGP_KEY_ARG:
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
476
break;
477
case ARGP_KEY_END:
478
578
break;
479
579
default:
480
580
return ARGP_ERR_UNKNOWN;
481
581
}
482
return 0;
582
return errno;
483
583
}
484
584
485
struct argp argp = { .options = options, .parser = parse_opt,
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
585
struct argp argp = { .options = options,
586
.parser = parse_opt_config_file,
587
.args_doc = "",
487
588
.doc = "Mandos plugin runner -- Run plugins" };
488
589
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
490
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
492
exitstatus = EXIT_FAILURE;
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;
493
606
goto fallback;
494
607
}
495
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
608
609
/* Reset to the normal argument parser */
610
argp.parser = parse_opt;
611
612
/* Open the configfile if available */
613
if(argfile == NULL){
498
614
conffp = fopen(AFILE, "r");
499
615
} else {
500
616
conffp = fopen(argfile, "r");
501
}
617
}
502
618
if(conffp != NULL){
503
619
char *org_line = NULL;
504
620
char *p, *arg, *new_arg, *line;
505
621
size_t size = 0;
506
ssize_t sret;
507
622
const char whitespace_delims[] = " \r\t\f\v\n";
508
623
const char comment_delim[] = "#";
509
624
510
625
custom_argc = 1;
511
626
custom_argv = malloc(sizeof(char*) * 2);
512
627
if(custom_argv == NULL){
516
631
}
517
632
custom_argv[0] = argv[0];
518
633
custom_argv[1] = NULL;
519
634
520
635
/* for each line in the config file, strip whitespace and ignore
521
636
commented text */
522
637
while(true){
524
639
if(sret == -1){
525
640
break;
526
641
}
527
642
528
643
line = org_line;
529
644
arg = strsep(&line, comment_delim);
530
645
while((p = strsep(&arg, whitespace_delims)) != NULL){
549
664
goto fallback;
550
665
}
551
666
custom_argv[custom_argc-1] = new_arg;
552
custom_argv[custom_argc] = NULL;
667
custom_argv[custom_argc] = NULL;
553
668
}
554
669
}
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
}
555
678
free(org_line);
556
} else{
679
} else {
557
680
/* Check for harmful errors and go to fallback. Other errors might
558
681
not affect opening plugins */
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
683
perror("fopen");
561
684
exitstatus = EXIT_FAILURE;
562
685
goto fallback;
563
686
}
564
687
}
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
567
690
if(custom_argv != NULL){
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
569
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
571
exitstatus = EXIT_FAILURE;
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;
572
705
goto fallback;
573
706
}
574
707
}
575
708
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
576
728
if(debug){
577
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
578
730
fprintf(stderr, "Plugin: %s has %d arguments\n",
580
732
for(char **a = p->argv; *a != NULL; a++){
581
733
fprintf(stderr, "\tArg: %s\n", *a);
582
734
}
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
584
736
for(char **a = p->environ; *a != NULL; a++){
585
737
fprintf(stderr, "\t%s\n", *a);
586
738
}
587
739
}
588
740
}
589
741
590
742
/* Strip permissions down to nobody */
743
setgid(gid);
744
if(ret == -1){
745
perror("setgid");
746
}
591
747
ret = setuid(uid);
592
if (ret == -1){
748
if(ret == -1){
593
749
perror("setuid");
594
}
595
setgid(gid);
596
if (ret == -1){
597
perror("setgid");
598
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
605
606
if(dir == NULL){
607
perror("Could not open plugin dir");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
610
}
611
612
/* Set the FD_CLOEXEC flag on the directory, if possible */
750
}
751
752
/* Open plugin directory with close_on_exec flag */
613
753
{
614
int dir_fd = dirfd(dir);
615
if(dir_fd >= 0){
616
ret = set_cloexec_flag(dir_fd);
617
if(ret < 0){
618
perror("set_cloexec_flag");
619
exitstatus = EXIT_FAILURE;
620
goto fallback;
621
}
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;
622
795
}
623
796
}
624
797
625
798
FD_ZERO(&rfds_all);
626
799
627
800
/* Read and execute any executable in the plugin directory*/
628
801
while(true){
629
dirst = readdir(dir);
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
630
805
631
// All directory entries have been processed
806
/* All directory entries have been processed */
632
807
if(dirst == NULL){
633
if (errno == EBADF){
808
if(errno == EBADF){
634
809
perror("readdir");
635
810
exitstatus = EXIT_FAILURE;
636
811
goto fallback;
640
815
641
816
d_name_len = strlen(dirst->d_name);
642
817
643
// Ignore dotfiles, backup files and other junk
818
/* Ignore dotfiles, backup files and other junk */
644
819
{
645
820
bool bad_name = false;
646
821
648
823
649
824
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
650
825
".dpkg-old",
826
".dpkg-bak",
651
827
".dpkg-divert", NULL };
652
828
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
653
829
size_t pre_len = strlen(*pre);
682
858
continue;
683
859
}
684
860
}
685
861
686
862
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
688
871
if(ret < 0){
689
872
perror("asprintf");
690
873
continue;
691
874
}
692
875
693
ret = stat(filename, &st);
694
if (ret == -1){
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
877
if(ret == -1){
695
878
perror("stat");
696
879
free(filename);
697
880
continue;
698
881
}
699
882
700
883
/* Ignore non-executable files */
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
702
886
if(debug){
703
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
704
888
" with bad type or mode\n", filename);
732
916
}
733
917
/* Add global environment variables */
734
918
for(char **e = g->environ; *e != NULL; e++){
735
if(not add_environment(p, *e)){
919
if(not add_environment(p, *e, false)){
736
920
perror("add_environment");
737
921
}
738
922
}
743
927
process, too. */
744
928
if(p->environ[0] != NULL){
745
929
for(char **e = environ; *e != NULL; e++){
746
char *copy = strdup(*e);
747
if(copy == NULL){
748
perror("strdup");
749
continue;
750
}
751
if(not add_environment(p, copy)){
930
if(not add_environment(p, *e, false)){
752
931
perror("add_environment");
753
932
}
754
933
}
755
934
}
756
935
757
936
int pipefd[2];
758
ret = pipe(pipefd);
759
if (ret == -1){
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
938
if(ret == -1){
760
939
perror("pipe");
761
940
exitstatus = EXIT_FAILURE;
762
941
goto fallback;
775
954
goto fallback;
776
955
}
777
956
/* Block SIGCHLD until process is safely in process list */
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
779
960
if(ret < 0){
780
961
perror("sigprocmask");
781
962
exitstatus = EXIT_FAILURE;
782
963
goto fallback;
783
964
}
784
// Starting a new process to be watched
785
pid_t pid = fork();
965
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
786
970
if(pid == -1){
787
971
perror("fork");
788
972
exitstatus = EXIT_FAILURE;
795
979
perror("sigaction");
796
980
_exit(EXIT_FAILURE);
797
981
}
798
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
982
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
799
983
if(ret < 0){
800
984
perror("sigprocmask");
801
985
_exit(EXIT_FAILURE);
802
986
}
803
987
804
988
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
805
989
if(ret == -1){
806
990
perror("dup2");
826
1010
/* no return */
827
1011
}
828
1012
/* Parent process */
829
close(pipefd[1]); /* Close unused write end of pipe */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
830
1015
free(filename);
831
1016
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
1017
if(new_plugin == NULL){
833
1018
perror("getplugin");
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
835
1022
if(ret < 0){
836
1023
perror("sigprocmask");
837
1024
}
844
1031
845
1032
/* Unblock SIGCHLD so signal handler can be run if this process
846
1033
has already completed */
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
848
1037
if(ret < 0){
849
1038
perror("sigprocmask");
850
1039
exitstatus = EXIT_FAILURE;
851
1040
goto fallback;
852
1041
}
853
1042
854
FD_SET(new_plugin->fd, &rfds_all);
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
855
1045
856
if (maxfd < new_plugin->fd){
1046
if(maxfd < new_plugin->fd){
857
1047
maxfd = new_plugin->fd;
858
1048
}
859
860
1049
}
861
1050
862
closedir(dir);
1051
TEMP_FAILURE_RETRY(closedir(dir));
863
1052
dir = NULL;
864
1053
free_plugin(getplugin(NULL));
1054
865
1055
for(plugin *p = plugin_list; p != NULL; p = p->next){
866
1056
if(p->pid != 0){
867
1057
break;
872
1062
free_plugin_list();
873
1063
}
874
1064
}
875
1065
876
1066
/* Main loop while running plugins exist */
877
1067
while(plugin_list){
878
1068
fd_set rfds = rfds_all;
879
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
880
if (select_ret == -1){
1070
if(select_ret == -1 and errno != EINTR){
881
1071
perror("select");
882
1072
exitstatus = EXIT_FAILURE;
883
1073
goto fallback;
884
1074
}
885
1075
/* OK, now either a process completed, or something can be read
886
1076
from one of them */
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1077
for(plugin *proc = plugin_list; proc != NULL;){
888
1078
/* Is this process completely done? */
889
if(proc->eof and proc->completed){
1079
if(proc->completed and proc->eof){
890
1080
/* Only accept the plugin output if it exited cleanly */
891
1081
if(not WIFEXITED(proc->status)
892
1082
or WEXITSTATUS(proc->status) != 0){
893
1083
/* Bad exit by plugin */
894
1084
895
1085
if(debug){
896
1086
if(WIFEXITED(proc->status)){
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
899
1090
WEXITSTATUS(proc->status));
900
} else if(WIFSIGNALED(proc->status)) {
901
fprintf(stderr, "Plugin %u killed by signal %d\n",
902
(unsigned int) (proc->pid),
903
WTERMSIG(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)));
904
1097
} else if(WCOREDUMP(proc->status)){
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(unsigned int) (proc->pid));
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
907
1100
}
908
1101
}
909
1102
910
1103
/* Remove the plugin */
911
FD_CLR(proc->fd, &rfds_all);
912
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
913
1107
/* Block signal while modifying process_list */
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
915
1112
if(ret < 0){
916
1113
perror("sigprocmask");
917
1114
exitstatus = EXIT_FAILURE;
918
1115
goto fallback;
919
1116
}
1117
1118
plugin *next_plugin = proc->next;
920
1119
free_plugin(proc);
1120
proc = next_plugin;
1121
921
1122
/* We are done modifying process list, so unblock signal */
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
923
NULL);
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
924
1126
if(ret < 0){
925
1127
perror("sigprocmask");
926
1128
exitstatus = EXIT_FAILURE;
930
1132
if(plugin_list == NULL){
931
1133
break;
932
1134
}
1135
933
1136
continue;
934
1137
}
935
1138
936
1139
/* This process exited nicely, so print its buffer */
937
1140
938
1141
bool bret = print_out_password(proc->buffer,
939
1142
proc->buffer_length);
940
1143
if(not bret){
945
1148
}
946
1149
947
1150
/* This process has not completed. Does it have any output? */
948
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
949
1154
/* This process had nothing to say at this time */
1155
proc = proc->next;
950
1156
continue;
951
1157
}
952
1158
/* Before reading, make the process' data buffer large enough */
953
1159
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
954
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
955
1161
+ (size_t) BUFFER_SIZE);
956
if (proc->buffer == NULL){
1162
if(proc->buffer == NULL){
957
1163
perror("malloc");
958
1164
exitstatus = EXIT_FAILURE;
959
1165
goto fallback;
961
1167
proc->buffer_size += BUFFER_SIZE;
962
1168
}
963
1169
/* Read from the process */
964
ret = read(proc->fd, proc->buffer + proc->buffer_length,
965
BUFFER_SIZE);
966
if(ret < 0){
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1174
if(sret < 0){
967
1175
/* Read error from this process; ignore the error */
1176
proc = proc->next;
968
1177
continue;
969
1178
}
970
if(ret == 0){
1179
if(sret == 0){
971
1180
/* got EOF */
972
1181
proc->eof = true;
973
1182
} else {
974
proc->buffer_length += (size_t) ret;
1183
proc->buffer_length += (size_t) sret;
975
1184
}
976
1185
}
977
1186
}
978
979
1187
1188
980
1189
fallback:
981
1190
982
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
985
1194
bool bret;
986
1195
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
987
1196
char *passwordbuffer = getpass("Password: ");
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
989
1204
if(not bret){
990
1205
perror("print_out_password");
991
1206
exitstatus = EXIT_FAILURE;
998
1213
perror("sigaction");
999
1214
exitstatus = EXIT_FAILURE;
1000
1215
}
1001
1216
1002
1217
if(custom_argv != NULL){
1003
1218
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1004
1219
free(*arg);
1010
1225
closedir(dir);
1011
1226
}
1012
1227
1013
/* Free the process list and kill the processes */
1228
/* Kill the processes */
1014
1229
for(plugin *p = plugin_list; p != NULL; p = p->next){
1015
1230
if(p->pid != 0){
1016
1231
close(p->fd);
1023
1238
}
1024
1239
1025
1240
/* Wait for any remaining child processes to terminate */
1026
do{
1241
do {
1027
1242
ret = wait(NULL);
1028
1243
} while(ret >= 0);
1029
1244
if(errno != ECHILD){
1030
1245
perror("wait");
1031
1246
}
1032
1247
1033
1248
free_plugin_list();
1034
1249
1035
1250
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0