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- Committer: Teddy Hogeborn
- Date: 2009-11-05 19:16:46 UTC
- Revision ID: teddy@fukt.bsnet.se-20091105191646-5l7bkq5h4wkh3huh
* mandos-monitor: New prototype version of interactive server
administraton tool using D-Bus.
administraton tool using D-Bus.
- 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
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
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
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, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
66
73
67
74
#define BUFFER_SIZE 256
68
75
69
76
#define PDIR "/lib/mandos/plugins.d"
70
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
78
72
const char *argp_program_version = "plugin-runner 1.0";
79
const char *argp_program_version = "plugin-runner " VERSION;
73
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
81
75
struct plugin;
76
77
82
typedef struct plugin{
78
83
char *name; /* can be NULL or any plugin name */
79
84
char **argv;
81
86
char **environ;
82
87
int envc;
83
88
bool disabled;
84
89
85
90
/* Variables used for running processes*/
86
91
pid_t pid;
87
92
int fd;
89
94
size_t buffer_size;
90
95
size_t buffer_length;
91
96
bool eof;
92
volatile bool completed;
93
volatile int status;
97
volatile sig_atomic_t completed;
98
int status;
94
99
struct plugin *next;
95
100
} plugin;
96
101
97
102
static plugin *plugin_list = NULL;
98
103
99
/* Gets a existing plugin based on name,
104
/* Gets an existing plugin based on name,
100
105
or if none is found, creates a new one */
101
106
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))){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
106
111
return p;
107
112
}
108
113
}
109
114
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
112
120
return NULL;
113
121
}
114
122
char *copy_name = NULL;
115
123
if(name != NULL){
116
copy_name = strdup(name);
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
117
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
118
131
return NULL;
119
132
}
120
133
}
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){
134
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
139
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
129
145
free(copy_name);
130
146
free(new_plugin);
147
errno = e;
131
148
return NULL;
132
149
}
133
150
new_plugin->argv[0] = copy_name;
134
151
new_plugin->argv[1] = NULL;
135
152
136
new_plugin->environ = malloc(sizeof(char *));
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
137
156
if(new_plugin->environ == NULL){
157
int e = errno;
138
158
free(copy_name);
139
159
free(new_plugin->argv);
140
160
free(new_plugin);
161
errno = e;
141
162
return NULL;
142
163
}
143
164
new_plugin->environ[0] = NULL;
151
172
static bool add_to_char_array(const char *new, char ***array,
152
173
int *len){
153
174
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
156
179
/* Malloc check */
157
180
if(*array == NULL){
158
181
return false;
159
182
}
160
183
/* Make a copy of the new string */
161
char *copy = strdup(new);
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
162
188
if(copy == NULL){
163
189
return false;
164
190
}
179
205
}
180
206
181
207
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
208
static bool add_environment(plugin *p, const char *def, bool replace){
183
209
if(p == NULL){
184
210
return false;
185
211
}
187
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
214
/* Search for this environment variable */
189
215
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* Refuse to add an existing variable */
216
if(strncmp(*e, def, namelen + 1) == 0){
217
/* It already exists */
218
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
224
return false;
225
}
226
*e = new;
227
strcpy(*e, def);
228
}
192
229
return true;
193
230
}
194
231
}
198
235
/*
199
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
200
237
* Descriptor Flags".
201
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
202
239
*/
203
static int set_cloexec_flag(int fd)
204
{
205
int ret = fcntl(fd, F_GETFD, 0);
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
206
242
/* If reading the flags failed, return error indication now. */
207
243
if(ret < 0){
208
244
return ret;
209
245
}
210
246
/* Store modified flag word in the descriptor. */
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
212
249
}
213
250
214
251
215
252
/* Mark processes as completed when they exit, and save their exit
216
253
status. */
217
void handle_sigchld(__attribute__((unused)) int sig){
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
218
256
while(true){
219
257
plugin *proc = plugin_list;
220
258
int status;
224
262
break;
225
263
}
226
264
if(pid == -1){
227
if (errno != ECHILD){
228
perror("waitpid");
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
229
268
}
230
/* No child processes */
231
break;
269
perror("waitpid");
232
270
}
233
271
234
272
/* A child exited, find it in process_list */
235
273
while(proc != NULL and proc->pid != pid){
236
274
proc = proc->next;
240
278
continue;
241
279
}
242
280
proc->status = status;
243
proc->completed = true;
281
proc->completed = 1;
244
282
}
283
errno = old_errno;
245
284
}
246
285
247
286
/* Prints out a password to stdout */
248
bool print_out_password(const char *buffer, size_t length){
287
static bool print_out_password(const char *buffer, size_t length){
249
288
ssize_t ret;
250
if(length>0 and buffer[length-1] == '\n'){
251
length--;
252
}
253
289
for(size_t written = 0; written < length; written += (size_t)ret){
254
290
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
255
291
length - written));
272
308
}
273
309
free(plugin_node->environ);
274
310
free(plugin_node->buffer);
275
311
276
312
/* Removes the plugin from the singly-linked list */
277
313
if(plugin_node == plugin_list){
278
314
/* First one - simple */
306
342
struct stat st;
307
343
fd_set rfds_all;
308
344
int ret, maxfd = 0;
345
ssize_t sret;
309
346
uid_t uid = 65534;
310
347
gid_t gid = 65534;
311
348
bool debug = false;
321
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
322
359
if(ret == -1){
323
360
perror("sigaddset");
324
exitstatus = EXIT_FAILURE;
361
exitstatus = EX_OSERR;
325
362
goto fallback;
326
363
}
327
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
328
365
if(ret == -1){
329
366
perror("sigaction");
330
exitstatus = EXIT_FAILURE;
367
exitstatus = EX_OSERR;
331
368
goto fallback;
332
369
}
333
370
336
373
{ .name = "global-options", .key = 'g',
337
374
.arg = "OPTION[,OPTION[,...]]",
338
375
.doc = "Options passed to all plugins" },
339
{ .name = "global-env", .key = 'e',
376
{ .name = "global-env", .key = 'G',
340
377
.arg = "VAR=value",
341
378
.doc = "Environment variable passed to all plugins" },
342
379
{ .name = "options-for", .key = 'o',
343
380
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
344
381
.doc = "Options passed only to specified plugin" },
345
{ .name = "env-for", .key = 'f',
382
{ .name = "env-for", .key = 'E',
346
383
.arg = "PLUGIN:ENV=value",
347
384
.doc = "Environment variable passed to specified plugin" },
348
385
{ .name = "disable", .key = 'd',
349
386
.arg = "PLUGIN",
350
387
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
389
.arg = "PLUGIN",
390
.doc = "Enable a specific plugin", .group = 1 },
351
391
{ .name = "plugin-dir", .key = 128,
352
392
.arg = "DIRECTORY",
353
393
.doc = "Specify a different plugin directory", .group = 2 },
362
402
.doc = "Group ID the plugins will run as", .group = 3 },
363
403
{ .name = "debug", .key = 132,
364
404
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
365
414
{ .name = NULL }
366
415
};
367
416
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) {
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
373
422
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
423
{
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
428
}
398
429
}
399
430
}
400
431
break;
432
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
434
break;
401
435
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
}
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
421
454
}
422
455
}
423
456
}
424
457
break;
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
458
case 'E': /* --env-for */
429
459
{
430
460
char *envdef = strchr(arg, ':');
431
461
if(envdef == NULL){
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
438
467
envdef++;
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
441
472
}
473
add_environment(getplugin(arg), envdef, true);
442
474
}
443
475
break;
444
476
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;
477
{
478
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
481
}
482
}
483
break;
484
case 'e': /* --enable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
489
}
451
490
}
452
491
break;
453
492
case 128: /* --plugin-dir */
493
free(plugindir);
454
494
plugindir = strdup(arg);
455
if(plugindir == NULL){
456
perror("strdup");
457
}
458
break;
459
case 129: /* --config-file */
495
break;
496
case 129: /* --config-file */
497
/* This is already done by parse_opt_config_file() */
498
break;
499
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
508
break;
509
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
518
break;
519
case 132: /* --debug */
520
debug = true;
521
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
case ARGP_KEY_ARG:
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
546
}
547
default:
548
return ARGP_ERR_UNKNOWN;
549
}
550
return errno; /* Set to 0 at start */
551
}
552
553
/* This option parser is the same as parse_opt() above, except it
554
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
560
case 'g': /* --global-options */
561
case 'G': /* --global-env */
562
case 'o': /* --options-for */
563
case 'E': /* --env-for */
564
case 'd': /* --disable */
565
case 'e': /* --enable */
566
case 128: /* --plugin-dir */
567
break;
568
case 129: /* --config-file */
569
free(argfile);
460
570
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
463
}
464
break;
571
break;
465
572
case 130: /* --userid */
466
uid = (uid_t)strtol(arg, NULL, 10);
467
break;
468
573
case 131: /* --groupid */
469
gid = (gid_t)strtol(arg, NULL, 10);
470
break;
471
574
case 132: /* --debug */
472
debug = true;
473
break;
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
474
578
case ARGP_KEY_ARG:
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
476
break;
477
case ARGP_KEY_END:
478
579
break;
479
580
default:
480
581
return ARGP_ERR_UNKNOWN;
481
582
}
482
return 0;
583
return errno;
483
584
}
484
585
485
struct argp argp = { .options = options, .parser = parse_opt,
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
588
.args_doc = "",
487
589
.doc = "Mandos plugin runner -- Run plugins" };
488
590
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;
591
/* Parse using parse_opt_config_file() in order to get the custom
592
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
493
607
goto fallback;
494
608
}
495
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
609
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
612
613
/* Open the configfile if available */
614
if(argfile == NULL){
498
615
conffp = fopen(AFILE, "r");
499
616
} else {
500
617
conffp = fopen(argfile, "r");
501
}
618
}
502
619
if(conffp != NULL){
503
620
char *org_line = NULL;
504
621
char *p, *arg, *new_arg, *line;
505
622
size_t size = 0;
506
ssize_t sret;
507
623
const char whitespace_delims[] = " \r\t\f\v\n";
508
624
const char comment_delim[] = "#";
509
625
510
626
custom_argc = 1;
511
627
custom_argv = malloc(sizeof(char*) * 2);
512
628
if(custom_argv == NULL){
513
629
perror("malloc");
514
exitstatus = EXIT_FAILURE;
630
exitstatus = EX_OSERR;
515
631
goto fallback;
516
632
}
517
633
custom_argv[0] = argv[0];
518
634
custom_argv[1] = NULL;
519
635
520
636
/* for each line in the config file, strip whitespace and ignore
521
637
commented text */
522
638
while(true){
524
640
if(sret == -1){
525
641
break;
526
642
}
527
643
528
644
line = org_line;
529
645
arg = strsep(&line, comment_delim);
530
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
534
650
new_arg = strdup(p);
535
651
if(new_arg == NULL){
536
652
perror("strdup");
537
exitstatus = EXIT_FAILURE;
653
exitstatus = EX_OSERR;
538
654
free(org_line);
539
655
goto fallback;
540
656
}
544
660
* ((unsigned int) custom_argc + 1));
545
661
if(custom_argv == NULL){
546
662
perror("realloc");
547
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
548
664
free(org_line);
549
665
goto fallback;
550
666
}
551
667
custom_argv[custom_argc-1] = new_arg;
552
custom_argv[custom_argc] = NULL;
668
custom_argv[custom_argc] = NULL;
553
669
}
554
670
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
555
679
free(org_line);
556
} else{
680
} else {
557
681
/* Check for harmful errors and go to fallback. Other errors might
558
682
not affect opening plugins */
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
684
perror("fopen");
561
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_OSERR;
562
686
goto fallback;
563
687
}
564
688
}
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
567
691
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;
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
572
706
goto fallback;
573
707
}
574
708
}
575
709
710
/* Parse actual command line arguments, to let them override the
711
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
726
goto fallback;
727
}
728
576
729
if(debug){
577
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
578
731
fprintf(stderr, "Plugin: %s has %d arguments\n",
580
733
for(char **a = p->argv; *a != NULL; a++){
581
734
fprintf(stderr, "\tArg: %s\n", *a);
582
735
}
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
584
737
for(char **a = p->environ; *a != NULL; a++){
585
738
fprintf(stderr, "\t%s\n", *a);
586
739
}
587
740
}
588
741
}
589
742
590
743
/* Strip permissions down to nobody */
744
setgid(gid);
745
if(ret == -1){
746
perror("setgid");
747
}
591
748
ret = setuid(uid);
592
if (ret == -1){
749
if(ret == -1){
593
750
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 */
751
}
752
753
/* Open plugin directory with close_on_exec flag */
613
754
{
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
}
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
622
796
}
623
797
}
624
798
625
799
FD_ZERO(&rfds_all);
626
800
627
801
/* Read and execute any executable in the plugin directory*/
628
802
while(true){
629
dirst = readdir(dir);
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
630
806
631
// All directory entries have been processed
807
/* All directory entries have been processed */
632
808
if(dirst == NULL){
633
if (errno == EBADF){
809
if(errno == EBADF){
634
810
perror("readdir");
635
exitstatus = EXIT_FAILURE;
811
exitstatus = EX_IOERR;
636
812
goto fallback;
637
813
}
638
814
break;
640
816
641
817
d_name_len = strlen(dirst->d_name);
642
818
643
// Ignore dotfiles, backup files and other junk
819
/* Ignore dotfiles, backup files and other junk */
644
820
{
645
821
bool bad_name = false;
646
822
648
824
649
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
650
826
".dpkg-old",
827
".dpkg-bak",
651
828
".dpkg-divert", NULL };
652
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
653
830
size_t pre_len = strlen(*pre);
682
859
continue;
683
860
}
684
861
}
685
862
686
863
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
688
872
if(ret < 0){
689
873
perror("asprintf");
690
874
continue;
691
875
}
692
876
693
ret = stat(filename, &st);
694
if (ret == -1){
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
695
879
perror("stat");
696
880
free(filename);
697
881
continue;
698
882
}
699
883
700
884
/* Ignore non-executable files */
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
702
887
if(debug){
703
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
704
889
" with bad type or mode\n", filename);
732
917
}
733
918
/* Add global environment variables */
734
919
for(char **e = g->environ; *e != NULL; e++){
735
if(not add_environment(p, *e)){
920
if(not add_environment(p, *e, false)){
736
921
perror("add_environment");
737
922
}
738
923
}
743
928
process, too. */
744
929
if(p->environ[0] != NULL){
745
930
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)){
931
if(not add_environment(p, *e, false)){
752
932
perror("add_environment");
753
933
}
754
934
}
755
935
}
756
936
757
937
int pipefd[2];
758
ret = pipe(pipefd);
759
if (ret == -1){
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
760
940
perror("pipe");
761
exitstatus = EXIT_FAILURE;
941
exitstatus = EX_OSERR;
762
942
goto fallback;
763
943
}
764
944
/* Ask OS to automatic close the pipe on exec */
765
945
ret = set_cloexec_flag(pipefd[0]);
766
946
if(ret < 0){
767
947
perror("set_cloexec_flag");
768
exitstatus = EXIT_FAILURE;
948
exitstatus = EX_OSERR;
769
949
goto fallback;
770
950
}
771
951
ret = set_cloexec_flag(pipefd[1]);
772
952
if(ret < 0){
773
953
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
954
exitstatus = EX_OSERR;
775
955
goto fallback;
776
956
}
777
957
/* Block SIGCHLD until process is safely in process list */
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
779
961
if(ret < 0){
780
962
perror("sigprocmask");
781
exitstatus = EXIT_FAILURE;
963
exitstatus = EX_OSERR;
782
964
goto fallback;
783
965
}
784
// Starting a new process to be watched
785
pid_t pid = fork();
966
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
786
971
if(pid == -1){
787
972
perror("fork");
788
exitstatus = EXIT_FAILURE;
973
exitstatus = EX_OSERR;
789
974
goto fallback;
790
975
}
791
976
if(pid == 0){
793
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
794
979
if(ret < 0){
795
980
perror("sigaction");
796
_exit(EXIT_FAILURE);
981
_exit(EX_OSERR);
797
982
}
798
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
799
984
if(ret < 0){
800
985
perror("sigprocmask");
801
_exit(EXIT_FAILURE);
986
_exit(EX_OSERR);
802
987
}
803
988
804
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
805
990
if(ret == -1){
806
991
perror("dup2");
807
_exit(EXIT_FAILURE);
992
_exit(EX_OSERR);
808
993
}
809
994
810
995
if(dirfd(dir) < 0){
815
1000
if(p->environ[0] == NULL){
816
1001
if(execv(filename, p->argv) < 0){
817
1002
perror("execv");
818
_exit(EXIT_FAILURE);
1003
_exit(EX_OSERR);
819
1004
}
820
1005
} else {
821
1006
if(execve(filename, p->argv, p->environ) < 0){
822
1007
perror("execve");
823
_exit(EXIT_FAILURE);
1008
_exit(EX_OSERR);
824
1009
}
825
1010
}
826
1011
/* no return */
827
1012
}
828
1013
/* Parent process */
829
close(pipefd[1]); /* Close unused write end of pipe */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
830
1016
free(filename);
831
1017
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
1018
if(new_plugin == NULL){
833
1019
perror("getplugin");
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
835
1023
if(ret < 0){
836
1024
perror("sigprocmask");
837
1025
}
838
exitstatus = EXIT_FAILURE;
1026
exitstatus = EX_OSERR;
839
1027
goto fallback;
840
1028
}
841
1029
844
1032
845
1033
/* Unblock SIGCHLD so signal handler can be run if this process
846
1034
has already completed */
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
848
1038
if(ret < 0){
849
1039
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
1040
exitstatus = EX_OSERR;
851
1041
goto fallback;
852
1042
}
853
1043
854
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
855
1046
856
if (maxfd < new_plugin->fd){
1047
if(maxfd < new_plugin->fd){
857
1048
maxfd = new_plugin->fd;
858
1049
}
859
860
1050
}
861
1051
862
closedir(dir);
1052
TEMP_FAILURE_RETRY(closedir(dir));
863
1053
dir = NULL;
864
1054
free_plugin(getplugin(NULL));
1055
865
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
866
1057
if(p->pid != 0){
867
1058
break;
872
1063
free_plugin_list();
873
1064
}
874
1065
}
875
1066
876
1067
/* Main loop while running plugins exist */
877
1068
while(plugin_list){
878
1069
fd_set rfds = rfds_all;
879
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
880
if (select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
881
1072
perror("select");
882
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
883
1074
goto fallback;
884
1075
}
885
1076
/* OK, now either a process completed, or something can be read
886
1077
from one of them */
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1078
for(plugin *proc = plugin_list; proc != NULL;){
888
1079
/* Is this process completely done? */
889
if(proc->eof and proc->completed){
1080
if(proc->completed and proc->eof){
890
1081
/* Only accept the plugin output if it exited cleanly */
891
1082
if(not WIFEXITED(proc->status)
892
1083
or WEXITSTATUS(proc->status) != 0){
893
1084
/* Bad exit by plugin */
894
1085
895
1086
if(debug){
896
1087
if(WIFEXITED(proc->status)){
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
899
1091
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));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
904
1098
} else if(WCOREDUMP(proc->status)){
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(unsigned int) (proc->pid));
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
907
1101
}
908
1102
}
909
1103
910
1104
/* Remove the plugin */
911
FD_CLR(proc->fd, &rfds_all);
912
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
913
1108
/* Block signal while modifying process_list */
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
915
1113
if(ret < 0){
916
1114
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1115
exitstatus = EX_OSERR;
918
1116
goto fallback;
919
1117
}
1118
1119
plugin *next_plugin = proc->next;
920
1120
free_plugin(proc);
1121
proc = next_plugin;
1122
921
1123
/* We are done modifying process list, so unblock signal */
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
923
NULL);
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
924
1127
if(ret < 0){
925
1128
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1129
exitstatus = EX_OSERR;
927
1130
goto fallback;
928
1131
}
929
1132
930
1133
if(plugin_list == NULL){
931
1134
break;
932
1135
}
1136
933
1137
continue;
934
1138
}
935
1139
936
1140
/* This process exited nicely, so print its buffer */
937
1141
938
1142
bool bret = print_out_password(proc->buffer,
939
1143
proc->buffer_length);
940
1144
if(not bret){
941
1145
perror("print_out_password");
942
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
943
1147
}
944
1148
goto fallback;
945
1149
}
946
1150
947
1151
/* This process has not completed. Does it have any output? */
948
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
949
1155
/* This process had nothing to say at this time */
1156
proc = proc->next;
950
1157
continue;
951
1158
}
952
1159
/* Before reading, make the process' data buffer large enough */
953
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
954
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
955
1162
+ (size_t) BUFFER_SIZE);
956
if (proc->buffer == NULL){
1163
if(proc->buffer == NULL){
957
1164
perror("malloc");
958
exitstatus = EXIT_FAILURE;
1165
exitstatus = EX_OSERR;
959
1166
goto fallback;
960
1167
}
961
1168
proc->buffer_size += BUFFER_SIZE;
962
1169
}
963
1170
/* Read from the process */
964
ret = read(proc->fd, proc->buffer + proc->buffer_length,
965
BUFFER_SIZE);
966
if(ret < 0){
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
967
1176
/* Read error from this process; ignore the error */
1177
proc = proc->next;
968
1178
continue;
969
1179
}
970
if(ret == 0){
1180
if(sret == 0){
971
1181
/* got EOF */
972
1182
proc->eof = true;
973
1183
} else {
974
proc->buffer_length += (size_t) ret;
1184
proc->buffer_length += (size_t) sret;
975
1185
}
976
1186
}
977
1187
}
978
979
1188
1189
980
1190
fallback:
981
1191
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
983
1194
/* Fallback if all plugins failed, none are found or an error
984
1195
occured */
985
1196
bool bret;
986
1197
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
987
1198
char *passwordbuffer = getpass("Password: ");
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1203
len--;
1204
}
1205
bret = print_out_password(passwordbuffer, len);
989
1206
if(not bret){
990
1207
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
1208
exitstatus = EX_IOERR;
992
1209
}
993
1210
}
994
1211
996
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
997
1214
if(ret == -1){
998
1215
perror("sigaction");
999
exitstatus = EXIT_FAILURE;
1216
exitstatus = EX_OSERR;
1000
1217
}
1001
1218
1002
1219
if(custom_argv != NULL){
1003
1220
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1004
1221
free(*arg);
1010
1227
closedir(dir);
1011
1228
}
1012
1229
1013
/* Free the process list and kill the processes */
1230
/* Kill the processes */
1014
1231
for(plugin *p = plugin_list; p != NULL; p = p->next){
1015
1232
if(p->pid != 0){
1016
1233
close(p->fd);
1023
1240
}
1024
1241
1025
1242
/* Wait for any remaining child processes to terminate */
1026
do{
1243
do {
1027
1244
ret = wait(NULL);
1028
1245
} while(ret >= 0);
1029
1246
if(errno != ECHILD){
1030
1247
perror("wait");
1031
1248
}
1032
1249
1033
1250
free_plugin_list();
1034
1251
1035
1252
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0