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- Committer: Teddy Hogeborn
- Date: 2009-02-09 19:33:46 UTC
- mfrom: (24.1.135 mandos)
- Revision ID: teddy@fukt.bsnet.se-20090209193346-5insyr1rsisor8dj
Merge from Björn:
* plugins.d/mandos-client.c (mc): Initialize globally.
(main): Better handling of signals.
* plugins.d/mandos-client.c (mc): Initialize globally.
(main): Better handling of signals.
- 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:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
69
67
70
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
71
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
77
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
87
78
typedef struct plugin{
88
79
char *name; /* can be NULL or any plugin name */
89
80
char **argv;
91
82
char **environ;
92
83
int envc;
93
84
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
94
95
struct plugin *next;
95
96
} plugin;
96
97
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
101
107
return p;
102
108
}
103
109
}
104
110
/* Create a new plugin */
105
111
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
112
if(new_plugin == NULL){
107
113
return NULL;
108
114
}
109
115
char *copy_name = NULL;
110
116
if(name != NULL){
111
117
copy_name = strdup(name);
112
118
if(copy_name == NULL){
119
free(new_plugin);
113
120
return NULL;
114
121
}
115
122
}
116
123
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
122
128
123
129
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
130
if(new_plugin->argv == NULL){
125
131
free(copy_name);
126
132
free(new_plugin);
127
133
return NULL;
128
134
}
129
135
new_plugin->argv[0] = copy_name;
130
136
new_plugin->argv[1] = NULL;
131
137
132
138
new_plugin->environ = malloc(sizeof(char *));
133
139
if(new_plugin->environ == NULL){
134
140
free(copy_name);
137
143
return NULL;
138
144
}
139
145
new_plugin->environ[0] = NULL;
146
140
147
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
142
149
return new_plugin;
143
150
}
144
151
174
181
}
175
182
176
183
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
184
static bool add_environment(plugin *p, const char *def, bool replace){
178
185
if(p == NULL){
179
186
return false;
180
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
181
205
return add_to_char_array(def, &(p->environ), &(p->envc));
182
206
}
183
207
184
185
208
/*
186
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
210
* Descriptor Flags".
188
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
212
*/
190
static int set_cloexec_flag(int fd)
191
{
213
static int set_cloexec_flag(int fd){
192
214
int ret = fcntl(fd, F_GETFD, 0);
193
215
/* If reading the flags failed, return error indication now. */
194
216
if(ret < 0){
198
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
221
}
200
222
201
process *process_list = NULL;
202
223
203
224
/* Mark processes as completed when they exit, and save their exit
204
225
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
206
228
while(true){
207
process *proc = process_list;
229
plugin *proc = plugin_list;
208
230
int status;
209
231
pid_t pid = waitpid(-1, &status, WNOHANG);
210
232
if(pid == 0){
212
234
break;
213
235
}
214
236
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
217
240
}
218
/* No child processes */
219
break;
241
perror("waitpid");
220
242
}
221
243
222
244
/* A child exited, find it in process_list */
223
245
while(proc != NULL and proc->pid != pid){
224
246
proc = proc->next;
228
250
continue;
229
251
}
230
252
proc->status = status;
231
proc->completed = true;
253
proc->completed = 1;
232
254
}
255
errno = old_errno;
233
256
}
234
257
235
bool print_out_password(const char *buffer, size_t length){
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
236
260
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
261
for(size_t written = 0; written < length; written += (size_t)ret){
241
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
263
length - written));
247
268
return true;
248
269
}
249
270
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
256
295
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
296
}
297
298
free(plugin_node);
270
299
}
271
300
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
284
304
}
285
305
}
286
306
287
307
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
290
310
FILE *conffp;
291
311
size_t d_name_len;
292
312
DIR *dir = NULL;
293
313
struct dirent *dirst;
294
314
struct stat st;
295
315
fd_set rfds_all;
296
int ret, maxfd = 0;
316
int ret, numchars, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
297
319
uid_t uid = 65534;
298
320
gid_t gid = 65534;
299
321
bool debug = false;
324
346
{ .name = "global-options", .key = 'g',
325
347
.arg = "OPTION[,OPTION[,...]]",
326
348
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
349
{ .name = "global-env", .key = 'G',
328
350
.arg = "VAR=value",
329
351
.doc = "Environment variable passed to all plugins" },
330
352
{ .name = "options-for", .key = 'o',
331
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
354
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
355
{ .name = "env-for", .key = 'E',
334
356
.arg = "PLUGIN:ENV=value",
335
357
.doc = "Environment variable passed to specified plugin" },
336
358
{ .name = "disable", .key = 'd',
337
359
.arg = "PLUGIN",
338
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
339
364
{ .name = "plugin-dir", .key = 128,
340
365
.arg = "DIRECTORY",
341
366
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
350
378
{ .name = NULL }
351
379
};
352
380
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
switch(key){
384
case 'g': /* --global-options */
385
if(arg != NULL){
386
char *plugin_option;
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
363
389
continue;
364
390
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
391
if(not add_argument(getplugin(NULL), plugin_option)){
366
392
perror("add_argument");
367
393
return ARGP_ERR_UNKNOWN;
368
394
}
369
395
}
370
396
}
371
397
break;
372
case 'e':
398
case 'G': /* --global-env */
373
399
if(arg == NULL){
374
400
break;
375
401
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
384
404
}
385
405
break;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
406
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
406
417
}
407
418
}
408
419
}
409
420
break;
410
case 'f':
421
case 'E': /* --env-for */
411
422
if(arg == NULL){
412
423
break;
413
424
}
416
427
if(envdef == NULL){
417
428
break;
418
429
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
425
432
perror("add_environment");
426
433
}
427
434
}
428
435
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
436
case 'd': /* --disable */
437
if(arg != NULL){
438
plugin *p = getplugin(arg);
432
439
if(p == NULL){
433
440
return ARGP_ERR_UNKNOWN;
434
441
}
435
442
p->disabled = true;
436
443
}
437
444
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
445
case 'e': /* --enable */
446
if(arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
472
}
473
break;
474
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
482
}
483
break;
484
case 132: /* --debug */
448
485
debug = true;
449
486
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
487
/*
488
* When adding more options before this line, remember to also add a
489
* "case" to the "parse_opt_config_file" function below.
490
*/
491
case ARGP_KEY_ARG:
492
/* Cryptsetup always passes an argument, which is an empty
493
string if "none" was specified in /etc/crypttab. So if
494
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
497
}
498
break;
499
case ARGP_KEY_END:
500
break;
501
default:
502
return ARGP_ERR_UNKNOWN;
503
}
504
return 0;
505
}
506
507
/* This option parser is the same as parse_opt() above, except it
508
ignores everything but the --config-file option. */
509
error_t parse_opt_config_file(int key, char *arg,
510
__attribute__((unused))
511
struct argp_state *state){
512
switch(key){
513
case 'g': /* --global-options */
514
case 'G': /* --global-env */
515
case 'o': /* --options-for */
516
case 'E': /* --env-for */
517
case 'd': /* --disable */
518
case 'e': /* --enable */
519
case 128: /* --plugin-dir */
520
break;
521
case 129: /* --config-file */
522
free(argfile);
523
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
528
case 130: /* --userid */
529
case 131: /* --groupid */
530
case 132: /* --debug */
531
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
break;
534
default:
535
return ARGP_ERR_UNKNOWN;
536
}
537
return 0;
538
}
539
540
struct argp argp = { .options = options,
541
.parser = parse_opt_config_file,
542
.args_doc = "",
465
543
.doc = "Mandos plugin runner -- Run plugins" };
466
544
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
545
/* Parse using parse_opt_config_file() in order to get the custom
546
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
469
549
fprintf(stderr, "Unknown error while parsing arguments\n");
470
550
exitstatus = EXIT_FAILURE;
471
551
goto fallback;
472
552
}
473
474
conffp = fopen(argfile, "r");
553
554
/* Reset to the normal argument parser */
555
argp.parser = parse_opt;
556
557
/* Open the configfile if available */
558
if(argfile == NULL){
559
conffp = fopen(AFILE, "r");
560
} else {
561
conffp = fopen(argfile, "r");
562
}
475
563
if(conffp != NULL){
476
564
char *org_line = NULL;
477
565
char *p, *arg, *new_arg, *line;
478
566
size_t size = 0;
479
ssize_t sret;
480
567
const char whitespace_delims[] = " \r\t\f\v\n";
481
568
const char comment_delim[] = "#";
482
569
570
custom_argc = 1;
571
custom_argv = malloc(sizeof(char*) * 2);
572
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
575
goto fallback;
576
}
577
custom_argv[0] = argv[0];
578
custom_argv[1] = NULL;
579
580
/* for each line in the config file, strip whitespace and ignore
581
commented text */
483
582
while(true){
484
583
sret = getline(&org_line, &size, conffp);
485
584
if(sret == -1){
493
592
continue;
494
593
}
495
594
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
595
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
598
free(org_line);
599
goto fallback;
600
}
601
602
custom_argc += 1;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
610
}
611
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
502
613
}
503
614
}
504
615
free(org_line);
505
} else{
616
} else {
506
617
/* Check for harmful errors and go to fallback. Other errors might
507
618
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
620
perror("fopen");
510
621
exitstatus = EXIT_FAILURE;
511
622
goto fallback;
512
623
}
513
624
}
514
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
515
627
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
520
631
fprintf(stderr, "Unknown error while parsing arguments\n");
521
632
exitstatus = EXIT_FAILURE;
522
633
goto fallback;
523
634
}
524
635
}
525
636
637
/* Parse actual command line arguments, to let them override the
638
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
644
}
645
526
646
if(debug){
527
647
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
648
fprintf(stderr, "Plugin: %s has %d arguments\n",
530
650
for(char **a = p->argv; *a != NULL; a++){
531
651
fprintf(stderr, "\tArg: %s\n", *a);
532
652
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
653
fprintf(stderr, "...and %d environment variables\n", p->envc);
534
654
for(char **a = p->environ; *a != NULL; a++){
535
655
fprintf(stderr, "\t%s\n", *a);
536
656
}
537
657
}
538
658
}
539
659
660
/* Strip permissions down to nobody */
661
setgid(gid);
662
if(ret == -1){
663
perror("setgid");
664
}
540
665
ret = setuid(uid);
541
if (ret == -1){
666
if(ret == -1){
542
667
perror("setuid");
543
668
}
544
669
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
548
674
}
549
675
550
dir = opendir(plugindir);
551
676
if(dir == NULL){
552
677
perror("Could not open plugin dir");
553
678
exitstatus = EXIT_FAILURE;
569
694
570
695
FD_ZERO(&rfds_all);
571
696
697
/* Read and execute any executable in the plugin directory*/
572
698
while(true){
573
699
dirst = readdir(dir);
574
700
575
// All directory entries have been processed
701
/* All directory entries have been processed */
576
702
if(dirst == NULL){
577
if (errno == EBADF){
703
if(errno == EBADF){
578
704
perror("readdir");
579
705
exitstatus = EXIT_FAILURE;
580
706
goto fallback;
584
710
585
711
d_name_len = strlen(dirst->d_name);
586
712
587
// Ignore dotfiles, backup files and other junk
713
/* Ignore dotfiles, backup files and other junk */
588
714
{
589
715
bool bad_name = false;
590
716
592
718
593
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
720
".dpkg-old",
721
".dpkg-bak",
595
722
".dpkg-divert", NULL };
596
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
724
size_t pre_len = strlen(*pre);
605
732
break;
606
733
}
607
734
}
608
609
735
if(bad_name){
610
736
continue;
611
737
}
612
613
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
739
size_t suf_len = strlen(*suf);
615
740
if((d_name_len >= suf_len)
630
755
}
631
756
632
757
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
634
763
if(ret < 0){
635
764
perror("asprintf");
636
765
continue;
637
766
}
638
767
639
768
ret = stat(filename, &st);
640
if (ret == -1){
769
if(ret == -1){
641
770
perror("stat");
642
771
free(filename);
643
772
continue;
644
773
}
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
774
775
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
777
if(debug){
648
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
779
" with bad type or mode\n", filename);
651
781
free(filename);
652
782
continue;
653
783
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
784
785
plugin *p = getplugin(dirst->d_name);
655
786
if(p == NULL){
656
787
perror("getplugin");
657
788
free(filename);
667
798
}
668
799
{
669
800
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
801
plugin *g = getplugin(NULL);
671
802
if(g != NULL){
672
803
for(char **a = g->argv + 1; *a != NULL; a++){
673
804
if(not add_argument(p, *a)){
676
807
}
677
808
/* Add global environment variables */
678
809
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
810
if(not add_environment(p, *e, false)){
680
811
perror("add_environment");
681
812
}
682
813
}
687
818
process, too. */
688
819
if(p->environ[0] != NULL){
689
820
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
821
if(not add_environment(p, *e, false)){
696
822
perror("add_environment");
697
823
}
698
824
}
700
826
701
827
int pipefd[2];
702
828
ret = pipe(pipefd);
703
if (ret == -1){
829
if(ret == -1){
704
830
perror("pipe");
705
831
exitstatus = EXIT_FAILURE;
706
832
goto fallback;
707
833
}
834
/* Ask OS to automatic close the pipe on exec */
708
835
ret = set_cloexec_flag(pipefd[0]);
709
836
if(ret < 0){
710
837
perror("set_cloexec_flag");
718
845
goto fallback;
719
846
}
720
847
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
722
849
if(ret < 0){
723
850
perror("sigprocmask");
724
851
exitstatus = EXIT_FAILURE;
725
852
goto fallback;
726
853
}
727
// Starting a new process to be watched
854
/* Starting a new process to be watched */
728
855
pid_t pid = fork();
729
856
if(pid == -1){
730
857
perror("fork");
738
865
perror("sigaction");
739
866
_exit(EXIT_FAILURE);
740
867
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
869
if(ret < 0){
743
870
perror("sigprocmask");
744
871
_exit(EXIT_FAILURE);
745
872
}
746
873
747
874
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
875
if(ret == -1){
749
876
perror("dup2");
768
895
}
769
896
/* no return */
770
897
}
771
/* parent process */
898
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
772
900
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
plugin *new_plugin = getplugin(dirst->d_name);
902
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
905
if(ret < 0){
779
perror("sigprocmask");
906
perror("sigprocmask");
780
907
}
781
908
exitstatus = EXIT_FAILURE;
782
909
goto fallback;
783
910
}
784
911
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
912
new_plugin->pid = pid;
913
new_plugin->fd = pipefd[0];
914
790
915
/* Unblock SIGCHLD so signal handler can be run if this process
791
916
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
793
918
if(ret < 0){
794
919
perror("sigprocmask");
795
920
exitstatus = EXIT_FAILURE;
796
921
goto fallback;
797
922
}
798
923
799
FD_SET(new_process->fd, &rfds_all);
924
FD_SET(new_plugin->fd, &rfds_all);
800
925
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
926
if(maxfd < new_plugin->fd){
927
maxfd = new_plugin->fd;
803
928
}
804
805
929
}
806
930
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
931
closedir(dir);
811
932
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
933
free_plugin(getplugin(NULL));
934
935
for(plugin *p = plugin_list; p != NULL; p = p->next){
936
if(p->pid != 0){
937
break;
938
}
939
if(p->next == NULL){
940
fprintf(stderr, "No plugin processes started. Incorrect plugin"
941
" directory?\n");
942
free_plugin_list();
943
}
817
944
}
818
while(process_list){
945
946
/* Main loop while running plugins exist */
947
while(plugin_list){
819
948
fd_set rfds = rfds_all;
820
949
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
950
if(select_ret == -1){
822
951
perror("select");
823
952
exitstatus = EXIT_FAILURE;
824
953
goto fallback;
825
954
}
826
955
/* OK, now either a process completed, or something can be read
827
956
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
957
for(plugin *proc = plugin_list; proc != NULL;){
829
958
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
959
if(proc->completed and proc->eof){
831
960
/* Only accept the plugin output if it exited cleanly */
832
961
if(not WIFEXITED(proc->status)
833
962
or WEXITSTATUS(proc->status) != 0){
834
963
/* Bad exit by plugin */
964
835
965
if(debug){
836
966
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
968
" status %d\n", proc->name,
969
(intmax_t) (proc->pid),
839
970
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
971
} else if(WIFSIGNALED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
974
(intmax_t) (proc->pid),
843
975
WTERMSIG(proc->status));
844
976
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
847
979
}
848
980
}
981
849
982
/* Remove the plugin */
850
983
FD_CLR(proc->fd, &rfds_all);
984
851
985
/* Block signal while modifying process_list */
852
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
987
if(ret < 0){
855
989
exitstatus = EXIT_FAILURE;
856
990
goto fallback;
857
991
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
871
997
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
874
1000
if(ret < 0){
875
1001
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
883
1011
}
1012
884
1013
/* This process exited nicely, so print its buffer */
885
1014
886
1015
bool bret = print_out_password(proc->buffer,
887
1016
proc->buffer_length);
888
1017
if(not bret){
891
1020
}
892
1021
goto fallback;
893
1022
}
1023
894
1024
/* This process has not completed. Does it have any output? */
895
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1026
/* This process had nothing to say at this time */
1027
proc = proc->next;
897
1028
continue;
898
1029
}
899
1030
/* Before reading, make the process' data buffer large enough */
900
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
1033
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
904
1035
perror("malloc");
905
1036
exitstatus = EXIT_FAILURE;
906
1037
goto fallback;
908
1039
proc->buffer_size += BUFFER_SIZE;
909
1040
}
910
1041
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
914
1045
/* Read error from this process; ignore the error */
1046
proc = proc->next;
915
1047
continue;
916
1048
}
917
if(ret == 0){
1049
if(sret == 0){
918
1050
/* got EOF */
919
1051
proc->eof = true;
920
1052
} else {
921
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;
922
1054
}
923
1055
}
924
1056
}
926
1058
927
1059
fallback:
928
1060
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
930
1062
/* Fallback if all plugins failed, none are found or an error
931
1063
occured */
932
1064
bool bret;
933
1065
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1066
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1071
len--;
1072
}
1073
bret = print_out_password(passwordbuffer, len);
936
1074
if(not bret){
937
1075
perror("print_out_password");
938
1076
exitstatus = EXIT_FAILURE;
945
1083
perror("sigaction");
946
1084
exitstatus = EXIT_FAILURE;
947
1085
}
948
1086
949
1087
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1089
free(*arg);
952
1090
}
953
1091
free(custom_argv);
954
1092
}
955
free_plugin_list(plugin_list);
956
1093
957
1094
if(dir != NULL){
958
1095
closedir(dir);
959
1096
}
960
1097
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1100
if(p->pid != 0){
1101
close(p->fd);
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1106
}
969
1107
}
970
free(process_list->buffer);
971
free(process_list);
972
1108
}
973
1109
974
1110
/* Wait for any remaining child processes to terminate */
979
1115
perror("wait");
980
1116
}
981
1117
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
982
1123
return exitstatus;
983
1124
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0