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- Committer: Björn Påhlsson
- Date: 2008-08-19 09:41:45 UTC
- mfrom: (89 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 94.
- Revision ID: belorn@braxen-20080819094145-zi16kkw5l6t6nrd0
merge
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
64
#include <errno.h> /* errno, EBADF */
67
65
68
66
#define BUFFER_SIZE 256
69
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
74
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
76
86
typedef struct plugin{
77
87
char *name; /* can be NULL or any plugin name */
78
88
char **argv;
80
90
char **environ;
81
91
int envc;
82
92
bool disabled;
83
84
/* Variables used for running processes*/
85
pid_t pid;
86
int fd;
87
char *buffer;
88
size_t buffer_size;
89
size_t buffer_length;
90
bool eof;
91
volatile bool completed;
92
volatile int status;
93
93
struct plugin *next;
94
94
} plugin;
95
95
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
98
if ((p->name == name)
104
99
or (p->name and name and (strcmp(p->name, name) == 0))){
105
100
return p;
110
105
if (new_plugin == NULL){
111
106
return NULL;
112
107
}
113
char *copy_name = NULL;
114
if(name != NULL){
115
copy_name = strdup(name);
116
if(copy_name == NULL){
117
return NULL;
118
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
119
111
}
120
112
121
113
*new_plugin = (plugin) { .name = copy_name,
122
114
.argc = 1,
115
.envc = 0,
123
116
.disabled = false,
124
.next = plugin_list };
117
.next = *plugin_list };
125
118
126
119
new_plugin->argv = malloc(sizeof(char *) * 2);
127
120
if (new_plugin->argv == NULL){
128
free(copy_name);
129
121
free(new_plugin);
130
122
return NULL;
131
123
}
132
124
new_plugin->argv[0] = copy_name;
133
125
new_plugin->argv[1] = NULL;
134
126
135
127
new_plugin->environ = malloc(sizeof(char *));
136
128
if(new_plugin->environ == NULL){
137
free(copy_name);
138
129
free(new_plugin->argv);
139
130
free(new_plugin);
140
131
return NULL;
141
132
}
142
133
new_plugin->environ[0] = NULL;
143
144
134
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
146
136
return new_plugin;
147
137
}
148
138
178
168
}
179
169
180
170
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
182
172
if(p == NULL){
183
173
return false;
184
174
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
202
175
return add_to_char_array(def, &(p->environ), &(p->envc));
203
176
}
204
177
178
205
179
/*
206
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
181
* Descriptor Flags".
208
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
183
*/
210
static int set_cloexec_flag(int fd){
184
static int set_cloexec_flag(int fd)
185
{
211
186
int ret = fcntl(fd, F_GETFD, 0);
212
187
/* If reading the flags failed, return error indication now. */
213
188
if(ret < 0){
217
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
193
}
219
194
195
process *process_list = NULL;
220
196
221
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
222
198
status. */
223
static void handle_sigchld(__attribute__((unused)) int sig){
224
while(true){
225
plugin *proc = plugin_list;
226
int status;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
228
if(pid == 0){
229
/* Only still running child processes */
230
break;
231
}
232
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
235
}
236
/* No child processes */
237
break;
238
}
239
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
242
proc = proc->next;
243
}
244
if(proc == NULL){
245
/* Process not found in process list */
246
continue;
247
}
248
proc->status = status;
249
proc->completed = true;
250
}
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
251
216
}
252
217
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
255
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
256
223
for(size_t written = 0; written < length; written += (size_t)ret){
257
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
225
length - written));
263
230
return true;
264
231
}
265
232
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
290
239
}
291
}
292
293
free(plugin_node);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
294
252
}
295
253
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
299
}
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
300
268
}
301
269
302
270
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
305
273
FILE *conffp;
306
274
size_t d_name_len;
307
275
DIR *dir = NULL;
309
277
struct stat st;
310
278
fd_set rfds_all;
311
279
int ret, maxfd = 0;
312
ssize_t sret;
313
280
uid_t uid = 65534;
314
281
gid_t gid = 65534;
315
282
bool debug = false;
331
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
299
if(ret == -1){
333
300
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
301
exitstatus = EXIT_FAILURE;
335
302
goto fallback;
336
303
}
337
304
340
307
{ .name = "global-options", .key = 'g',
341
308
.arg = "OPTION[,OPTION[,...]]",
342
309
.doc = "Options passed to all plugins" },
343
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
344
311
.arg = "VAR=value",
345
312
.doc = "Environment variable passed to all plugins" },
346
313
{ .name = "options-for", .key = 'o',
347
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
348
315
.doc = "Options passed only to specified plugin" },
349
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
350
317
.arg = "PLUGIN:ENV=value",
351
318
.doc = "Environment variable passed to specified plugin" },
352
319
{ .name = "disable", .key = 'd',
353
320
.arg = "PLUGIN",
354
321
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
358
322
{ .name = "plugin-dir", .key = 128,
359
323
.arg = "DIRECTORY",
360
324
.doc = "Specify a different plugin directory", .group = 2 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
372
333
{ .name = NULL }
373
334
};
374
335
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
377
340
switch (key) {
378
case 'g': /* --global-options */
341
case 'g':
379
342
if (arg != NULL){
380
343
char *p;
381
344
while((p = strsep(&arg, ",")) != NULL){
382
345
if(p[0] == '\0'){
383
346
continue;
384
347
}
385
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
386
349
perror("add_argument");
387
350
return ARGP_ERR_UNKNOWN;
388
351
}
389
352
}
390
353
}
391
354
break;
392
case 'G': /* --global-env */
355
case 'e':
393
356
if(arg == NULL){
394
357
break;
395
358
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
398
367
}
399
368
break;
400
case 'o': /* --options-for */
369
case 'o':
401
370
if (arg != NULL){
402
371
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
404
373
break;
405
374
}
406
375
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
408
377
break;
409
378
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
418
389
}
419
390
}
420
391
}
421
392
break;
422
case 'E': /* --env-for */
393
case 'f':
423
394
if(arg == NULL){
424
395
break;
425
396
}
428
399
if(envdef == NULL){
429
400
break;
430
401
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
433
408
perror("add_environment");
434
409
}
435
410
}
436
411
break;
437
case 'd': /* --disable */
412
case 'd':
438
413
if (arg != NULL){
439
plugin *p = getplugin(arg);
414
plugin *p = getplugin(arg, plugins);
440
415
if(p == NULL){
441
416
return ARGP_ERR_UNKNOWN;
442
417
}
443
418
p->disabled = true;
444
419
}
445
420
break;
446
case 'e': /* --enable */
447
if (arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
466
425
uid = (uid_t)strtol(arg, NULL, 10);
467
426
break;
468
case 131: /* --groupid */
427
case 130:
469
428
gid = (gid_t)strtol(arg, NULL, 10);
470
429
break;
471
case 132: /* --debug */
430
case 131:
472
431
debug = true;
473
432
break;
474
433
case ARGP_KEY_ARG:
475
/* Cryptsetup always passes an argument, which is an empty
476
string if "none" was specified in /etc/crypttab. So if
477
argument was empty, we ignore it silently. */
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
484
default:
485
return ARGP_ERR_UNKNOWN;
486
}
487
return 0;
488
}
489
490
/* This option parser is the same as parse_opt() above, except it
491
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
496
case 'g': /* --global-options */
497
case 'G': /* --global-env */
498
case 'o': /* --options-for */
499
case 'E': /* --env-for */
500
case 'd': /* --disable */
501
case 'e': /* --enable */
502
case 128: /* --plugin-dir */
503
break;
504
case 129: /* --config-file */
505
free(argfile);
506
argfile = strdup(arg);
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
511
case 130: /* --userid */
512
case 131: /* --groupid */
513
case 132: /* --debug */
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
516
break;
517
default:
518
return ARGP_ERR_UNKNOWN;
519
}
520
return 0;
521
}
522
523
struct argp argp = { .options = options,
524
.parser = parse_opt_config_file,
525
.args_doc = "",
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
526
448
.doc = "Mandos plugin runner -- Run plugins" };
527
449
528
/* Parse using the parse_opt_config_file in order to get the custom
529
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
531
451
if (ret == ARGP_ERR_UNKNOWN){
532
452
fprintf(stderr, "Unknown error while parsing arguments\n");
533
453
exitstatus = EXIT_FAILURE;
534
454
goto fallback;
535
455
}
536
537
/* Reset to the normal argument parser */
538
argp.parser = parse_opt;
539
540
/* Open the configfile if available */
541
if (argfile == NULL){
542
conffp = fopen(AFILE, "r");
543
} else {
544
conffp = fopen(argfile, "r");
545
}
456
457
conffp = fopen(argfile, "r");
546
458
if(conffp != NULL){
547
459
char *org_line = NULL;
548
460
char *p, *arg, *new_arg, *line;
549
461
size_t size = 0;
462
ssize_t sret;
550
463
const char whitespace_delims[] = " \r\t\f\v\n";
551
464
const char comment_delim[] = "#";
552
465
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
565
466
while(true){
566
467
sret = getline(&org_line, &size, conffp);
567
468
if(sret == -1){
575
476
continue;
576
477
}
577
478
new_arg = strdup(p);
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
596
485
}
597
486
}
598
487
free(org_line);
599
} else {
488
} else{
600
489
/* Check for harmful errors and go to fallback. Other errors might
601
490
not affect opening plugins */
602
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
494
goto fallback;
606
495
}
607
496
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
497
610
498
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
501
if (ret == ARGP_ERR_UNKNOWN){
614
502
fprintf(stderr, "Unknown error while parsing arguments\n");
615
503
exitstatus = EXIT_FAILURE;
617
505
}
618
506
}
619
507
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
629
508
if(debug){
630
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
519
}
641
520
}
642
521
643
/* Strip permissions down to nobody */
644
522
ret = setuid(uid);
645
523
if (ret == -1){
646
524
perror("setuid");
647
}
525
}
526
648
527
setgid(gid);
649
528
if (ret == -1){
650
529
perror("setgid");
651
530
}
652
531
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
532
dir = opendir(plugindir);
659
533
if(dir == NULL){
660
534
perror("Could not open plugin dir");
661
535
exitstatus = EXIT_FAILURE;
677
551
678
552
FD_ZERO(&rfds_all);
679
553
680
/* Read and execute any executable in the plugin directory*/
681
554
while(true){
682
555
dirst = readdir(dir);
683
556
684
/* All directory entries have been processed */
557
// All directory entries have been processed
685
558
if(dirst == NULL){
686
559
if (errno == EBADF){
687
560
perror("readdir");
693
566
694
567
d_name_len = strlen(dirst->d_name);
695
568
696
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
697
570
{
698
571
bool bad_name = false;
699
572
701
574
702
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
576
".dpkg-old",
704
".dpkg-bak",
705
577
".dpkg-divert", NULL };
706
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
579
size_t pre_len = strlen(*pre);
715
587
break;
716
588
}
717
589
}
590
718
591
if(bad_name){
719
592
continue;
720
593
}
594
721
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
596
size_t suf_len = strlen(*suf);
723
597
if((d_name_len >= suf_len)
738
612
}
739
613
740
614
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
616
if(ret < 0){
747
617
perror("asprintf");
748
618
continue;
754
624
free(filename);
755
625
continue;
756
626
}
757
758
/* Ignore non-executable files */
627
759
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
629
if(debug){
761
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
633
free(filename);
765
634
continue;
766
635
}
767
768
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
769
637
if(p == NULL){
770
638
perror("getplugin");
771
639
free(filename);
781
649
}
782
650
{
783
651
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
785
653
if(g != NULL){
786
654
for(char **a = g->argv + 1; *a != NULL; a++){
787
655
if(not add_argument(p, *a)){
790
658
}
791
659
/* Add global environment variables */
792
660
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
794
662
perror("add_environment");
795
663
}
796
664
}
801
669
process, too. */
802
670
if(p->environ[0] != NULL){
803
671
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
805
678
perror("add_environment");
806
679
}
807
680
}
808
681
}
809
682
810
int pipefd[2];
683
int pipefd[2];
811
684
ret = pipe(pipefd);
812
685
if (ret == -1){
813
686
perror("pipe");
814
687
exitstatus = EXIT_FAILURE;
815
688
goto fallback;
816
689
}
817
/* Ask OS to automatic close the pipe on exec */
818
690
ret = set_cloexec_flag(pipefd[0]);
819
691
if(ret < 0){
820
692
perror("set_cloexec_flag");
834
706
exitstatus = EXIT_FAILURE;
835
707
goto fallback;
836
708
}
837
/* Starting a new process to be watched */
709
// Starting a new process to be watched
838
710
pid_t pid = fork();
839
711
if(pid == -1){
840
712
perror("fork");
848
720
perror("sigaction");
849
721
_exit(EXIT_FAILURE);
850
722
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
724
if(ret < 0){
853
725
perror("sigprocmask");
854
726
_exit(EXIT_FAILURE);
855
727
}
856
728
857
729
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
730
if(ret == -1){
859
731
perror("dup2");
878
750
}
879
751
/* no return */
880
752
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
753
/* parent process */
883
754
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
887
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
760
if(ret < 0){
889
perror("sigprocmask");
761
perror("sigprocmask");
890
762
}
891
763
exitstatus = EXIT_FAILURE;
892
764
goto fallback;
893
765
}
894
766
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
898
772
/* Unblock SIGCHLD so signal handler can be run if this process
899
773
has already completed */
900
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
778
goto fallback;
905
779
}
906
780
907
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
908
782
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
911
785
}
786
912
787
}
913
788
789
free_plugin_list(plugin_list);
790
914
791
closedir(dir);
915
792
dir = NULL;
916
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
if(p->pid != 0){
919
break;
920
}
921
if(p->next == NULL){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
923
" directory?\n");
924
free_plugin_list();
925
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
926
798
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
799
while(process_list){
930
800
fd_set rfds = rfds_all;
931
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
802
if (select_ret == -1){
936
806
}
937
807
/* OK, now either a process completed, or something can be read
938
808
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
940
810
/* Is this process completely done? */
941
811
if(proc->eof and proc->completed){
942
812
/* Only accept the plugin output if it exited cleanly */
943
813
if(not WIFEXITED(proc->status)
944
814
or WEXITSTATUS(proc->status) != 0){
945
815
/* Bad exit by plugin */
946
947
816
if(debug){
948
817
if(WIFEXITED(proc->status)){
949
818
fprintf(stderr, "Plugin %u exited with status %d\n",
958
827
(unsigned int) (proc->pid));
959
828
}
960
829
}
961
962
830
/* Remove the plugin */
963
831
FD_CLR(proc->fd, &rfds_all);
964
965
832
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
834
if(ret < 0){
968
835
perror("sigprocmask");
969
836
exitstatus = EXIT_FAILURE;
970
837
goto fallback;
971
838
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
977
852
/* We are done modifying process list, so unblock signal */
978
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
854
NULL);
980
855
if(ret < 0){
981
856
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
991
864
}
992
993
865
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
868
if(not bret){
998
869
perror("print_out_password");
999
870
exitstatus = EXIT_FAILURE;
1000
871
}
1001
872
goto fallback;
1002
873
}
1003
1004
874
/* This process has not completed. Does it have any output? */
1005
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
876
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
877
continue;
1009
878
}
1010
879
/* Before reading, make the process' data buffer large enough */
1019
888
proc->buffer_size += BUFFER_SIZE;
1020
889
}
1021
890
/* Read from the process */
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(sret < 0){
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1025
894
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
895
continue;
1028
896
}
1029
if(sret == 0){
897
if(ret == 0){
1030
898
/* got EOF */
1031
899
proc->eof = true;
1032
900
} else {
1033
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1034
902
}
1035
903
}
1036
904
}
1038
906
1039
907
fallback:
1040
908
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1044
911
bool bret;
1045
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
913
char *passwordbuffer = getpass("Password: ");
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
len--;
1052
}
1053
bret = print_out_password(passwordbuffer, len);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
915
if(not bret){
1055
916
perror("print_out_password");
1056
917
exitstatus = EXIT_FAILURE;
1063
924
perror("sigaction");
1064
925
exitstatus = EXIT_FAILURE;
1065
926
}
1066
927
1067
928
if(custom_argv != NULL){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1069
930
free(*arg);
1070
931
}
1071
932
free(custom_argv);
1072
933
}
934
free_plugin_list(plugin_list);
1073
935
1074
936
if(dir != NULL){
1075
937
closedir(dir);
1076
938
}
1077
939
1078
/* Kill the processes */
1079
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
if(p->pid != 0){
1081
close(p->fd);
1082
ret = kill(p->pid, SIGTERM);
1083
if(ret == -1 and errno != ESRCH){
1084
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1086
}
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1087
948
}
949
free(process_list->buffer);
950
free(process_list);
1088
951
}
1089
952
1090
953
/* Wait for any remaining child processes to terminate */
1095
958
perror("wait");
1096
959
}
1097
960
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
961
return exitstatus;
1104
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0