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- Committer: Teddy Hogeborn
- Date: 2008-10-03 09:32:30 UTC
- Revision ID: teddy@fukt.bsnet.se-20081003093230-rshn19e0c19zz12i
* .bzrignore (plugins.d/askpass-fifo): Added.
* Makefile (FORTIFY): Added "-fstack-protector-all".
(mandos, mandos-keygen): Use more strict regexps when updating the
version number.
* mandos (Client.__init__): Use os.path.expandvars() and
os.path.expanduser() on the "secfile"
config value.
* plugins.d/splashy.c: Update comments and order of #include's.
(main): Check user and group when looking for running splashy
process. Do not ignore ENOENT from execl(). Use _exit()
instead of "return" when an error happens in child
processes. Bug fix: Only wait for splashy_update
completion if it was started. Bug fix: detect failing
waitpid(). Only kill splashy_update if it is running. Do
the killing of the old splashy process before the fork().
Do setsid() and setuid(geteuid()) before starting the new
splashy. Report failing execl().
* plugins.d/usplash.c: Update comments and order of #include's.
(main): Check user and group when looking for running usplash
process. Do not report execv() error if interrupted by a
signal.
* Makefile (FORTIFY): Added "-fstack-protector-all".
(mandos, mandos-keygen): Use more strict regexps when updating the
version number.
* mandos (Client.__init__): Use os.path.expandvars() and
os.path.expanduser() on the "secfile"
config value.
* plugins.d/splashy.c: Update comments and order of #include's.
(main): Check user and group when looking for running splashy
process. Do not ignore ENOENT from execl(). Use _exit()
instead of "return" when an error happens in child
processes. Bug fix: Only wait for splashy_update
completion if it was started. Bug fix: detect failing
waitpid(). Only kill splashy_update if it is running. Do
the killing of the old splashy process before the fork().
Do setsid() and setuid(geteuid()) before starting the new
splashy. Report failing execl().
* plugins.d/usplash.c: Update comments and order of #include's.
(main): Check user and group when looking for running usplash
process. Do not report execv() error if interrupted by a
signal.
- 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 Teddy Hogeborn & Björn Påhlsson
6
6
*
7
7
* This program is free software: you can redistribute it and/or
8
8
* modify it under the terms of the GNU General Public License as
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
29
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
stderr, STDOUT_FILENO */
32
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
33
stat, waitpid(), WIFEXITED(),
34
34
WEXITSTATUS(), wait(), pid_t,
46
46
fcntl(), setuid(), setgid(),
47
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
49
dup2(), STDOUT_FILENO, _exit(),
50
50
execv(), write(), read(),
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#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";
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner " VERSION;
71
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
74
73
struct process;
75
typedef struct plugin{
76
char *name; /* can be NULL or any plugin name */
77
char **argv;
78
int argc;
79
char **environ;
80
int envc;
81
bool disabled;
74
82
75
typedef struct process{
83
/* Variables used for running processes*/
76
84
pid_t pid;
77
85
int fd;
78
86
char *buffer;
81
89
bool eof;
82
90
volatile bool completed;
83
91
volatile int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
char **environ;
92
int envc;
93
bool disabled;
94
92
struct plugin *next;
95
93
} plugin;
96
94
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
99
102
if ((p->name == name)
100
103
or (p->name and name and (strcmp(p->name, name) == 0))){
101
104
return p;
116
119
117
120
*new_plugin = (plugin) { .name = copy_name,
118
121
.argc = 1,
119
.envc = 0,
120
122
.disabled = false,
121
.next = *plugin_list };
123
.next = plugin_list };
122
124
123
125
new_plugin->argv = malloc(sizeof(char *) * 2);
124
126
if (new_plugin->argv == NULL){
128
130
}
129
131
new_plugin->argv[0] = copy_name;
130
132
new_plugin->argv[1] = NULL;
131
133
132
134
new_plugin->environ = malloc(sizeof(char *));
133
135
if(new_plugin->environ == NULL){
134
136
free(copy_name);
137
139
return NULL;
138
140
}
139
141
new_plugin->environ[0] = NULL;
142
140
143
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
142
145
return new_plugin;
143
146
}
144
147
174
177
}
175
178
176
179
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
180
static bool add_environment(plugin *p, const char *def, bool replace){
178
181
if(p == NULL){
179
182
return false;
180
183
}
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
190
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
193
return false;
194
}
195
*e = new;
196
strcpy(*e, def);
197
}
198
return true;
199
}
200
}
181
201
return add_to_char_array(def, &(p->environ), &(p->envc));
182
202
}
183
203
184
185
204
/*
186
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
206
* Descriptor Flags".
188
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
208
*/
190
static int set_cloexec_flag(int fd)
191
{
209
static int set_cloexec_flag(int fd){
192
210
int ret = fcntl(fd, F_GETFD, 0);
193
211
/* If reading the flags failed, return error indication now. */
194
212
if(ret < 0){
198
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
217
}
200
218
201
process *process_list = NULL;
202
219
203
220
/* Mark processes as completed when they exit, and save their exit
204
221
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
222
static void handle_sigchld(__attribute__((unused)) int sig){
206
223
while(true){
207
process *proc = process_list;
224
plugin *proc = plugin_list;
208
225
int status;
209
226
pid_t pid = waitpid(-1, &status, WNOHANG);
210
227
if(pid == 0){
218
235
/* No child processes */
219
236
break;
220
237
}
221
238
222
239
/* A child exited, find it in process_list */
223
240
while(proc != NULL and proc->pid != pid){
224
241
proc = proc->next;
232
249
}
233
250
}
234
251
235
bool print_out_password(const char *buffer, size_t length){
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
236
254
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
255
for(size_t written = 0; written < length; written += (size_t)ret){
241
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
257
length - written));
247
262
return true;
248
263
}
249
264
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;
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
267
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
free(*arg);
270
}
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
273
free(*env);
274
}
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
277
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
282
} else {
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
287
break;
288
}
256
289
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
258
argv[1] = NULL;
259
}
260
*argc += 1;
261
argv = realloc(argv, sizeof(char *)
262
* ((unsigned int) *argc + 1));
263
if(argv == NULL){
264
return NULL;
265
}
266
argv[*argc-1] = arg;
267
argv[*argc] = NULL;
268
return argv;
290
}
291
292
free(plugin_node);
269
293
}
270
294
271
static void free_plugin_list(plugin *plugin_list){
272
for(plugin *next; plugin_list != NULL; plugin_list = next){
273
next = plugin_list->next;
274
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_list->argv);
278
for(char **env = plugin_list->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_list->environ);
282
free(plugin_list);
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
283
298
}
284
299
}
285
300
286
301
int main(int argc, char *argv[]){
287
const char *plugindir = "/lib/mandos/plugins.d";
288
const char *argfile = ARGFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
289
304
FILE *conffp;
290
305
size_t d_name_len;
291
306
DIR *dir = NULL;
323
338
{ .name = "global-options", .key = 'g',
324
339
.arg = "OPTION[,OPTION[,...]]",
325
340
.doc = "Options passed to all plugins" },
326
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
327
342
.arg = "VAR=value",
328
343
.doc = "Environment variable passed to all plugins" },
329
344
{ .name = "options-for", .key = 'o',
330
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
331
346
.doc = "Options passed only to specified plugin" },
332
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
333
348
.arg = "PLUGIN:ENV=value",
334
349
.doc = "Environment variable passed to specified plugin" },
335
350
{ .name = "disable", .key = 'd',
336
351
.arg = "PLUGIN",
337
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
338
356
{ .name = "plugin-dir", .key = 128,
339
357
.arg = "DIRECTORY",
340
358
.doc = "Specify a different plugin directory", .group = 2 },
341
{ .name = "userid", .key = 129,
342
.arg = "ID", .flags = 0,
343
.doc = "User ID the plugins will run as", .group = 2 },
344
{ .name = "groupid", .key = 130,
345
.arg = "ID", .flags = 0,
346
.doc = "Group ID the plugins will run as", .group = 2 },
347
{ .name = "debug", .key = 131,
348
.doc = "Debug mode", .group = 3 },
359
{ .name = "config-file", .key = 129,
360
.arg = "FILE",
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
349
370
{ .name = NULL }
350
371
};
351
372
352
error_t parse_opt (int key, char *arg, struct argp_state *state) {
353
/* Get the INPUT argument from `argp_parse', which we know is a
354
pointer to our plugin list pointer. */
355
plugin **plugins = state->input;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
356
375
switch (key) {
357
case 'g':
376
case 'g': /* --global-options */
358
377
if (arg != NULL){
359
378
char *p;
360
379
while((p = strsep(&arg, ",")) != NULL){
361
380
if(p[0] == '\0'){
362
381
continue;
363
382
}
364
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
365
384
perror("add_argument");
366
385
return ARGP_ERR_UNKNOWN;
367
386
}
368
387
}
369
388
}
370
389
break;
371
case 'e':
390
case 'G': /* --global-env */
372
391
if(arg == NULL){
373
392
break;
374
393
}
375
{
376
char *envdef = strdup(arg);
377
if(envdef == NULL){
378
break;
379
}
380
if(not add_environment(getplugin(NULL, plugins), envdef)){
381
perror("add_environment");
382
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
383
396
}
384
397
break;
385
case 'o':
398
case 'o': /* --options-for */
386
399
if (arg != NULL){
387
400
char *p_name = strsep(&arg, ":");
388
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
389
402
break;
390
403
}
391
404
char *opt = strsep(&arg, ":");
392
if(opt[0] == '\0'){
405
if(opt[0] == '\0' or opt == NULL){
393
406
break;
394
407
}
395
if(opt != NULL){
396
char *p;
397
while((p = strsep(&opt, ",")) != NULL){
398
if(p[0] == '\0'){
399
continue;
400
}
401
if(not add_argument(getplugin(p_name, plugins), p)){
402
perror("add_argument");
403
return ARGP_ERR_UNKNOWN;
404
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
405
416
}
406
417
}
407
418
}
408
419
break;
409
case 'f':
420
case 'E': /* --env-for */
410
421
if(arg == NULL){
411
422
break;
412
423
}
415
426
if(envdef == NULL){
416
427
break;
417
428
}
418
char *p_name = strndup(arg, (size_t) (envdef-arg));
419
if(p_name == NULL){
420
break;
421
}
422
envdef++;
423
if(not add_environment(getplugin(p_name, plugins), envdef)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
424
431
perror("add_environment");
425
432
}
426
433
}
427
434
break;
428
case 'd':
435
case 'd': /* --disable */
429
436
if (arg != NULL){
430
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
431
438
if(p == NULL){
432
439
return ARGP_ERR_UNKNOWN;
433
440
}
434
441
p->disabled = true;
435
442
}
436
443
break;
437
case 128:
438
plugindir = arg;
439
break;
440
case 129:
444
case 'e': /* --enable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
441
464
uid = (uid_t)strtol(arg, NULL, 10);
442
465
break;
443
case 130:
466
case 131: /* --groupid */
444
467
gid = (gid_t)strtol(arg, NULL, 10);
445
468
break;
446
case 131:
469
case 132: /* --debug */
447
470
debug = true;
448
471
break;
449
472
case ARGP_KEY_ARG:
450
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
451
break;
452
case ARGP_KEY_END:
453
break;
454
default:
455
return ARGP_ERR_UNKNOWN;
456
}
457
return 0;
458
}
459
460
plugin *plugin_list = NULL;
461
462
struct argp argp = { .options = options, .parser = parse_opt,
463
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
464
524
.doc = "Mandos plugin runner -- Run plugins" };
465
525
466
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
467
529
if (ret == ARGP_ERR_UNKNOWN){
468
530
fprintf(stderr, "Unknown error while parsing arguments\n");
469
531
exitstatus = EXIT_FAILURE;
470
532
goto fallback;
471
533
}
472
473
conffp = fopen(argfile, "r");
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
541
} else {
542
conffp = fopen(argfile, "r");
543
}
474
544
if(conffp != NULL){
475
545
char *org_line = NULL;
476
546
char *p, *arg, *new_arg, *line;
479
549
const char whitespace_delims[] = " \r\t\f\v\n";
480
550
const char comment_delim[] = "#";
481
551
552
custom_argc = 1;
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
558
}
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
482
564
while(true){
483
565
sret = getline(&org_line, &size, conffp);
484
566
if(sret == -1){
492
574
continue;
493
575
}
494
576
new_arg = strdup(p);
495
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
496
if (custom_argv == NULL){
497
perror("add_to_argv");
498
exitstatus = EXIT_FAILURE;
499
goto fallback;
500
}
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
584
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
592
}
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
501
595
}
502
596
}
503
597
free(org_line);
504
} else{
598
} else {
505
599
/* Check for harmful errors and go to fallback. Other errors might
506
600
not affect opening plugins */
507
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
510
604
goto fallback;
511
605
}
512
606
}
513
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
514
609
if(custom_argv != NULL){
515
custom_argv[0] = argv[0];
516
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
517
612
if (ret == ARGP_ERR_UNKNOWN){
518
613
fprintf(stderr, "Unknown error while parsing arguments\n");
519
614
exitstatus = EXIT_FAILURE;
521
616
}
522
617
}
523
618
619
/* Parse actual command line arguments, to let them override the
620
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
524
628
if(debug){
525
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
526
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
535
639
}
536
640
}
537
641
642
/* Strip permissions down to nobody */
538
643
ret = setuid(uid);
539
644
if (ret == -1){
540
645
perror("setuid");
541
}
542
646
}
543
647
setgid(gid);
544
648
if (ret == -1){
545
649
perror("setgid");
546
650
}
547
651
548
dir = opendir(plugindir);
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
549
658
if(dir == NULL){
550
659
perror("Could not open plugin dir");
551
660
exitstatus = EXIT_FAILURE;
567
676
568
677
FD_ZERO(&rfds_all);
569
678
679
/* Read and execute any executable in the plugin directory*/
570
680
while(true){
571
681
dirst = readdir(dir);
572
682
573
// All directory entries have been processed
683
/* All directory entries have been processed */
574
684
if(dirst == NULL){
575
685
if (errno == EBADF){
576
686
perror("readdir");
582
692
583
693
d_name_len = strlen(dirst->d_name);
584
694
585
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
586
696
{
587
697
bool bad_name = false;
588
698
603
713
break;
604
714
}
605
715
}
606
607
716
if(bad_name){
608
717
continue;
609
718
}
610
611
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
612
720
size_t suf_len = strlen(*suf);
613
721
if((d_name_len >= suf_len)
628
736
}
629
737
630
738
char *filename;
631
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
632
744
if(ret < 0){
633
745
perror("asprintf");
634
746
continue;
640
752
free(filename);
641
753
continue;
642
754
}
643
755
756
/* Ignore non-executable files */
644
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
645
758
if(debug){
646
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
762
free(filename);
650
763
continue;
651
764
}
652
plugin *p = getplugin(dirst->d_name, &plugin_list);
765
766
plugin *p = getplugin(dirst->d_name);
653
767
if(p == NULL){
654
768
perror("getplugin");
655
769
free(filename);
665
779
}
666
780
{
667
781
/* Add global arguments to argument list for this plugin */
668
plugin *g = getplugin(NULL, &plugin_list);
782
plugin *g = getplugin(NULL);
669
783
if(g != NULL){
670
784
for(char **a = g->argv + 1; *a != NULL; a++){
671
785
if(not add_argument(p, *a)){
674
788
}
675
789
/* Add global environment variables */
676
790
for(char **e = g->environ; *e != NULL; e++){
677
if(not add_environment(p, *e)){
791
if(not add_environment(p, *e, false)){
678
792
perror("add_environment");
679
793
}
680
794
}
685
799
process, too. */
686
800
if(p->environ[0] != NULL){
687
801
for(char **e = environ; *e != NULL; e++){
688
char *copy = strdup(*e);
689
if(copy == NULL){
690
perror("strdup");
691
continue;
692
}
693
if(not add_environment(p, copy)){
802
if(not add_environment(p, *e, false)){
694
803
perror("add_environment");
695
804
}
696
805
}
703
812
exitstatus = EXIT_FAILURE;
704
813
goto fallback;
705
814
}
815
/* Ask OS to automatic close the pipe on exec */
706
816
ret = set_cloexec_flag(pipefd[0]);
707
817
if(ret < 0){
708
818
perror("set_cloexec_flag");
722
832
exitstatus = EXIT_FAILURE;
723
833
goto fallback;
724
834
}
725
// Starting a new process to be watched
835
/* Starting a new process to be watched */
726
836
pid_t pid = fork();
727
837
if(pid == -1){
728
838
perror("fork");
736
846
perror("sigaction");
737
847
_exit(EXIT_FAILURE);
738
848
}
739
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
740
850
if(ret < 0){
741
851
perror("sigprocmask");
742
852
_exit(EXIT_FAILURE);
743
853
}
744
854
745
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
746
856
if(ret == -1){
747
857
perror("dup2");
766
876
}
767
877
/* no return */
768
878
}
769
/* parent process */
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
770
881
free(filename);
771
close(pipefd[1]); /* close unused write end of pipe */
772
process *new_process = malloc(sizeof(process));
773
if (new_process == NULL){
774
perror("malloc");
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
775
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
776
886
if(ret < 0){
777
perror("sigprocmask");
887
perror("sigprocmask");
778
888
}
779
889
exitstatus = EXIT_FAILURE;
780
890
goto fallback;
781
891
}
782
892
783
*new_process = (struct process){ .pid = pid,
784
.fd = pipefd[0],
785
.next = process_list };
786
// List handling
787
process_list = new_process;
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
788
896
/* Unblock SIGCHLD so signal handler can be run if this process
789
897
has already completed */
790
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
794
902
goto fallback;
795
903
}
796
904
797
FD_SET(new_process->fd, &rfds_all);
905
FD_SET(new_plugin->fd, &rfds_all);
798
906
799
if (maxfd < new_process->fd){
800
maxfd = new_process->fd;
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
801
909
}
802
803
910
}
804
911
805
free_plugin_list(plugin_list);
806
plugin_list = NULL;
807
808
912
closedir(dir);
809
913
dir = NULL;
810
811
if (process_list == NULL){
812
fprintf(stderr, "No plugin processes started. Incorrect plugin"
813
" directory?\n");
814
process_list = NULL;
914
915
for(plugin *p = plugin_list; p != NULL; p = p->next){
916
if(p->pid != 0){
917
break;
918
}
919
if(p->next == NULL){
920
fprintf(stderr, "No plugin processes started. Incorrect plugin"
921
" directory?\n");
922
free_plugin_list();
923
}
815
924
}
816
while(process_list){
925
926
/* Main loop while running plugins exist */
927
while(plugin_list){
817
928
fd_set rfds = rfds_all;
818
929
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
819
930
if (select_ret == -1){
823
934
}
824
935
/* OK, now either a process completed, or something can be read
825
936
from one of them */
826
for(process *proc = process_list; proc ; proc = proc->next){
937
for(plugin *proc = plugin_list; proc != NULL;){
827
938
/* Is this process completely done? */
828
939
if(proc->eof and proc->completed){
829
940
/* Only accept the plugin output if it exited cleanly */
830
941
if(not WIFEXITED(proc->status)
831
942
or WEXITSTATUS(proc->status) != 0){
832
943
/* Bad exit by plugin */
944
833
945
if(debug){
834
946
if(WIFEXITED(proc->status)){
835
947
fprintf(stderr, "Plugin %u exited with status %d\n",
844
956
(unsigned int) (proc->pid));
845
957
}
846
958
}
959
847
960
/* Remove the plugin */
848
961
FD_CLR(proc->fd, &rfds_all);
962
849
963
/* Block signal while modifying process_list */
850
964
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
965
if(ret < 0){
853
967
exitstatus = EXIT_FAILURE;
854
968
goto fallback;
855
969
}
856
/* Delete this process entry from the list */
857
if(process_list == proc){
858
/* First one - simple */
859
process_list = proc->next;
860
} else {
861
/* Second one or later */
862
for(process *p = process_list; p != NULL; p = p->next){
863
if(p->next == proc){
864
p->next = proc->next;
865
break;
866
}
867
}
868
}
970
971
plugin *next_plugin = proc->next;
972
free_plugin(proc);
973
proc = next_plugin;
974
869
975
/* We are done modifying process list, so unblock signal */
870
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
871
977
NULL);
872
978
if(ret < 0){
873
979
perror("sigprocmask");
874
}
875
free(proc->buffer);
876
free(proc);
877
/* We deleted this process from the list, so we can't go
878
proc->next. Therefore, start over from the beginning of
879
the process list */
880
break;
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
continue;
881
989
}
990
882
991
/* This process exited nicely, so print its buffer */
883
992
884
993
bool bret = print_out_password(proc->buffer,
885
994
proc->buffer_length);
886
995
if(not bret){
889
998
}
890
999
goto fallback;
891
1000
}
1001
892
1002
/* This process has not completed. Does it have any output? */
893
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
894
1004
/* This process had nothing to say at this time */
1005
proc = proc->next;
895
1006
continue;
896
1007
}
897
1008
/* Before reading, make the process' data buffer large enough */
910
1021
BUFFER_SIZE);
911
1022
if(ret < 0){
912
1023
/* Read error from this process; ignore the error */
1024
proc = proc->next;
913
1025
continue;
914
1026
}
915
1027
if(ret == 0){
924
1036
925
1037
fallback:
926
1038
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
928
1040
/* Fallback if all plugins failed, none are found or an error
929
1041
occured */
930
1042
bool bret;
931
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
932
1044
char *passwordbuffer = getpass("Password: ");
933
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
934
1052
if(not bret){
935
1053
perror("print_out_password");
936
1054
exitstatus = EXIT_FAILURE;
943
1061
perror("sigaction");
944
1062
exitstatus = EXIT_FAILURE;
945
1063
}
946
1064
947
1065
if(custom_argv != NULL){
948
for(char **arg = custom_argv; *arg != NULL; arg++){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
949
1067
free(*arg);
950
1068
}
951
1069
free(custom_argv);
952
1070
}
953
free_plugin_list(plugin_list);
954
1071
955
1072
if(dir != NULL){
956
1073
closedir(dir);
957
1074
}
958
1075
959
/* Free the process list and kill the processes */
960
for(process *next; process_list != NULL; process_list = next){
961
next = process_list->next;
962
close(process_list->fd);
963
ret = kill(process_list->pid, SIGTERM);
964
if(ret == -1 and errno != ESRCH){
965
/* set-uid proccesses migth not get closed */
966
perror("kill");
1076
/* Kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
967
1085
}
968
free(process_list->buffer);
969
free(process_list);
970
1086
}
971
1087
972
1088
/* Wait for any remaining child processes to terminate */
977
1093
perror("wait");
978
1094
}
979
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
980
1101
return exitstatus;
981
1102
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0