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- Committer: Björn Påhlsson
- Date: 2008-08-25 01:40:55 UTC
- mfrom: (103 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080825014055-pv5v6vqwb7wjmxqx
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,
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
SIG_UNBLOCK, kill() */
66
65
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
66
69
67
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
75
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
72
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
73
struct process;
84
74
85
/* Variables used for running processes*/
75
typedef struct process{
86
76
pid_t pid;
87
77
int fd;
88
78
char *buffer;
91
81
bool eof;
92
82
volatile bool completed;
93
83
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
94
struct plugin *next;
95
95
} plugin;
96
96
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
106
101
return p;
107
102
}
108
103
}
109
104
/* Create a new plugin */
110
105
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
106
if (new_plugin == NULL){
112
107
return NULL;
113
108
}
114
109
char *copy_name = NULL;
115
110
if(name != NULL){
116
111
copy_name = strdup(name);
117
112
if(copy_name == NULL){
118
free(new_plugin);
119
113
return NULL;
120
114
}
121
115
}
122
116
123
117
*new_plugin = (plugin) { .name = copy_name,
124
118
.argc = 1,
119
.envc = 0,
125
120
.disabled = false,
126
.next = plugin_list };
121
.next = *plugin_list };
127
122
128
123
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
124
if (new_plugin->argv == NULL){
130
125
free(copy_name);
131
126
free(new_plugin);
132
127
return NULL;
133
128
}
134
129
new_plugin->argv[0] = copy_name;
135
130
new_plugin->argv[1] = NULL;
136
131
137
132
new_plugin->environ = malloc(sizeof(char *));
138
133
if(new_plugin->environ == NULL){
139
134
free(copy_name);
142
137
return NULL;
143
138
}
144
139
new_plugin->environ[0] = NULL;
145
146
140
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
148
142
return new_plugin;
149
143
}
150
144
180
174
}
181
175
182
176
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
184
178
if(p == NULL){
185
179
return false;
186
180
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
181
return add_to_char_array(def, &(p->environ), &(p->envc));
205
182
}
206
183
184
207
185
/*
208
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
187
* Descriptor Flags".
210
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
189
*/
212
static int set_cloexec_flag(int fd){
190
static int set_cloexec_flag(int fd)
191
{
213
192
int ret = fcntl(fd, F_GETFD, 0);
214
193
/* If reading the flags failed, return error indication now. */
215
194
if(ret < 0){
219
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
199
}
221
200
201
process *process_list = NULL;
222
202
223
203
/* Mark processes as completed when they exit, and save their exit
224
204
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
205
void handle_sigchld(__attribute__((unused)) int sig){
226
206
while(true){
227
plugin *proc = plugin_list;
207
process *proc = process_list;
228
208
int status;
229
209
pid_t pid = waitpid(-1, &status, WNOHANG);
230
210
if(pid == 0){
232
212
break;
233
213
}
234
214
if(pid == -1){
235
if(errno != ECHILD){
215
if (errno != ECHILD){
236
216
perror("waitpid");
237
217
}
238
218
/* No child processes */
239
219
break;
240
220
}
241
221
242
222
/* A child exited, find it in process_list */
243
223
while(proc != NULL and proc->pid != pid){
244
224
proc = proc->next;
252
232
}
253
233
}
254
234
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
257
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
258
240
for(size_t written = 0; written < length; written += (size_t)ret){
259
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
242
length - written));
265
247
return true;
266
248
}
267
249
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
250
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
301
262
}
302
263
}
303
264
304
265
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
307
268
FILE *conffp;
308
269
size_t d_name_len;
309
270
DIR *dir = NULL;
310
271
struct dirent *dirst;
311
272
struct stat st;
312
273
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
274
int ret, maxfd = 0;
316
275
uid_t uid = 65534;
317
276
gid_t gid = 65534;
318
277
bool debug = false;
343
302
{ .name = "global-options", .key = 'g',
344
303
.arg = "OPTION[,OPTION[,...]]",
345
304
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
305
{ .name = "global-envs", .key = 'e',
347
306
.arg = "VAR=value",
348
307
.doc = "Environment variable passed to all plugins" },
349
308
{ .name = "options-for", .key = 'o',
350
309
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
310
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
311
{ .name = "envs-for", .key = 'f',
353
312
.arg = "PLUGIN:ENV=value",
354
313
.doc = "Environment variable passed to specified plugin" },
355
314
{ .name = "disable", .key = 'd',
356
315
.arg = "PLUGIN",
357
316
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
317
{ .name = "plugin-dir", .key = 128,
362
318
.arg = "DIRECTORY",
363
319
.doc = "Specify a different plugin directory", .group = 2 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.doc = "Debug mode", .group = 4 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.doc = "Debug mode", .group = 3 },
375
328
{ .name = NULL }
376
329
};
377
330
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
if(arg != NULL){
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
335
switch (key) {
336
case 'g':
337
if (arg != NULL){
383
338
char *p;
384
339
while((p = strsep(&arg, ",")) != NULL){
385
340
if(p[0] == '\0'){
386
341
continue;
387
342
}
388
if(not add_argument(getplugin(NULL), p)){
343
if(not add_argument(getplugin(NULL, plugins), p)){
389
344
perror("add_argument");
390
345
return ARGP_ERR_UNKNOWN;
391
346
}
392
347
}
393
348
}
394
349
break;
395
case 'G': /* --global-env */
350
case 'e':
396
351
if(arg == NULL){
397
352
break;
398
353
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
401
362
}
402
363
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
364
case 'o':
365
if (arg != NULL){
405
366
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
367
if(p_name[0] == '\0'){
407
368
break;
408
369
}
409
370
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
371
if(opt[0] == '\0'){
411
372
break;
412
373
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
421
384
}
422
385
}
423
386
}
424
387
break;
425
case 'E': /* --env-for */
388
case 'f':
426
389
if(arg == NULL){
427
390
break;
428
391
}
431
394
if(envdef == NULL){
432
395
break;
433
396
}
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
401
envdef++;
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
436
403
perror("add_environment");
437
404
}
438
405
}
439
406
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
443
410
if(p == NULL){
444
411
return ARGP_ERR_UNKNOWN;
445
412
}
446
413
p->disabled = true;
447
414
}
448
415
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
case 132: /* --debug */
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
420
uid = (uid_t)strtol(arg, NULL, 10);
421
break;
422
case 130:
423
gid = (gid_t)strtol(arg, NULL, 10);
424
break;
425
case 131:
489
426
debug = true;
490
427
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.args_doc = "",
428
case ARGP_KEY_ARG:
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
547
443
.doc = "Mandos plugin runner -- Run plugins" };
548
444
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
553
447
fprintf(stderr, "Unknown error while parsing arguments\n");
554
448
exitstatus = EXIT_FAILURE;
555
449
goto fallback;
556
450
}
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
563
conffp = fopen(AFILE, "r");
564
} else {
565
conffp = fopen(argfile, "r");
566
}
451
452
conffp = fopen(argfile, "r");
567
453
if(conffp != NULL){
568
454
char *org_line = NULL;
569
455
char *p, *arg, *new_arg, *line;
570
456
size_t size = 0;
457
ssize_t sret;
571
458
const char whitespace_delims[] = " \r\t\f\v\n";
572
459
const char comment_delim[] = "#";
573
460
580
467
}
581
468
custom_argv[0] = argv[0];
582
469
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
470
586
471
while(true){
587
472
sret = getline(&org_line, &size, conffp);
588
473
if(sret == -1){
596
481
continue;
597
482
}
598
483
new_arg = strdup(p);
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
484
606
485
custom_argc += 1;
607
486
custom_argv = realloc(custom_argv, sizeof(char *)
608
487
* ((unsigned int) custom_argc + 1));
617
496
}
618
497
}
619
498
free(org_line);
620
} else {
499
} else{
621
500
/* Check for harmful errors and go to fallback. Other errors might
622
501
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
503
perror("fopen");
625
504
exitstatus = EXIT_FAILURE;
626
505
goto fallback;
627
506
}
628
507
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
508
631
509
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
635
512
fprintf(stderr, "Unknown error while parsing arguments\n");
636
513
exitstatus = EXIT_FAILURE;
637
514
goto fallback;
638
515
}
639
516
}
640
517
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
650
518
if(debug){
651
519
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
520
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
522
for(char **a = p->argv; *a != NULL; a++){
655
523
fprintf(stderr, "\tArg: %s\n", *a);
656
524
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
658
526
for(char **a = p->environ; *a != NULL; a++){
659
527
fprintf(stderr, "\t%s\n", *a);
660
528
}
661
529
}
662
530
}
663
531
664
/* Strip permissions down to nobody */
665
532
ret = setuid(uid);
666
if(ret == -1){
533
if (ret == -1){
667
534
perror("setuid");
668
}
535
}
536
669
537
setgid(gid);
670
if(ret == -1){
538
if (ret == -1){
671
539
perror("setgid");
672
540
}
673
541
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
542
dir = opendir(plugindir);
680
543
if(dir == NULL){
681
544
perror("Could not open plugin dir");
682
545
exitstatus = EXIT_FAILURE;
698
561
699
562
FD_ZERO(&rfds_all);
700
563
701
/* Read and execute any executable in the plugin directory*/
702
564
while(true){
703
565
dirst = readdir(dir);
704
566
705
/* All directory entries have been processed */
567
// All directory entries have been processed
706
568
if(dirst == NULL){
707
if(errno == EBADF){
569
if (errno == EBADF){
708
570
perror("readdir");
709
571
exitstatus = EXIT_FAILURE;
710
572
goto fallback;
714
576
715
577
d_name_len = strlen(dirst->d_name);
716
578
717
/* Ignore dotfiles, backup files and other junk */
579
// Ignore dotfiles, backup files and other junk
718
580
{
719
581
bool bad_name = false;
720
582
722
584
723
585
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
586
".dpkg-old",
725
".dpkg-bak",
726
587
".dpkg-divert", NULL };
727
588
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
589
size_t pre_len = strlen(*pre);
736
597
break;
737
598
}
738
599
}
600
739
601
if(bad_name){
740
602
continue;
741
603
}
604
742
605
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
606
size_t suf_len = strlen(*suf);
744
607
if((d_name_len >= suf_len)
759
622
}
760
623
761
624
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
626
if(ret < 0){
768
627
perror("asprintf");
769
628
continue;
770
629
}
771
630
772
631
ret = stat(filename, &st);
773
if(ret == -1){
632
if (ret == -1){
774
633
perror("stat");
775
634
free(filename);
776
635
continue;
777
636
}
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
637
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
639
if(debug){
782
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
641
" with bad type or mode\n", filename);
785
643
free(filename);
786
644
continue;
787
645
}
788
789
plugin *p = getplugin(dirst->d_name);
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
647
if(p == NULL){
791
648
perror("getplugin");
792
649
free(filename);
802
659
}
803
660
{
804
661
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
662
plugin *g = getplugin(NULL, &plugin_list);
806
663
if(g != NULL){
807
664
for(char **a = g->argv + 1; *a != NULL; a++){
808
665
if(not add_argument(p, *a)){
811
668
}
812
669
/* Add global environment variables */
813
670
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
671
if(not add_environment(p, *e)){
815
672
perror("add_environment");
816
673
}
817
674
}
822
679
process, too. */
823
680
if(p->environ[0] != NULL){
824
681
for(char **e = environ; *e != NULL; e++){
825
if(not add_environment(p, *e, false)){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
826
688
perror("add_environment");
827
689
}
828
690
}
830
692
831
693
int pipefd[2];
832
694
ret = pipe(pipefd);
833
if(ret == -1){
695
if (ret == -1){
834
696
perror("pipe");
835
697
exitstatus = EXIT_FAILURE;
836
698
goto fallback;
837
699
}
838
/* Ask OS to automatic close the pipe on exec */
839
700
ret = set_cloexec_flag(pipefd[0]);
840
701
if(ret < 0){
841
702
perror("set_cloexec_flag");
849
710
goto fallback;
850
711
}
851
712
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
714
if(ret < 0){
854
715
perror("sigprocmask");
855
716
exitstatus = EXIT_FAILURE;
856
717
goto fallback;
857
718
}
858
/* Starting a new process to be watched */
719
// Starting a new process to be watched
859
720
pid_t pid = fork();
860
721
if(pid == -1){
861
722
perror("fork");
869
730
perror("sigaction");
870
731
_exit(EXIT_FAILURE);
871
732
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
734
if(ret < 0){
874
735
perror("sigprocmask");
875
736
_exit(EXIT_FAILURE);
876
737
}
877
738
878
739
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
740
if(ret == -1){
880
741
perror("dup2");
899
760
}
900
761
/* no return */
901
762
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
763
/* parent process */
904
764
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
769
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
770
if(ret < 0){
910
perror("sigprocmask");
771
perror("sigprocmask");
911
772
}
912
773
exitstatus = EXIT_FAILURE;
913
774
goto fallback;
914
775
}
915
776
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
919
782
/* Unblock SIGCHLD so signal handler can be run if this process
920
783
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
785
if(ret < 0){
923
786
perror("sigprocmask");
924
787
exitstatus = EXIT_FAILURE;
925
788
goto fallback;
926
789
}
927
790
928
FD_SET(new_plugin->fd, &rfds_all);
791
FD_SET(new_process->fd, &rfds_all);
929
792
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
932
795
}
796
933
797
}
934
798
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
935
802
closedir(dir);
936
803
dir = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
947
809
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
810
while(process_list){
951
811
fd_set rfds = rfds_all;
952
812
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
813
if (select_ret == -1){
954
814
perror("select");
955
815
exitstatus = EXIT_FAILURE;
956
816
goto fallback;
957
817
}
958
818
/* OK, now either a process completed, or something can be read
959
819
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
820
for(process *proc = process_list; proc ; proc = proc->next){
961
821
/* Is this process completely done? */
962
822
if(proc->eof and proc->completed){
963
823
/* Only accept the plugin output if it exited cleanly */
964
824
if(not WIFEXITED(proc->status)
965
825
or WEXITSTATUS(proc->status) != 0){
966
826
/* Bad exit by plugin */
967
968
827
if(debug){
969
828
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
972
831
WEXITSTATUS(proc->status));
973
832
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
976
835
WTERMSIG(proc->status));
977
836
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
980
839
}
981
840
}
982
983
841
/* Remove the plugin */
984
842
FD_CLR(proc->fd, &rfds_all);
985
986
843
/* Block signal while modifying process_list */
987
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
845
if(ret < 0){
990
847
exitstatus = EXIT_FAILURE;
991
848
goto fallback;
992
849
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
998
863
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1001
866
if(ret < 0){
1002
867
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
1012
875
}
1013
1014
876
/* This process exited nicely, so print its buffer */
1015
877
1016
878
bool bret = print_out_password(proc->buffer,
1017
879
proc->buffer_length);
1018
880
if(not bret){
1021
883
}
1022
884
goto fallback;
1023
885
}
1024
1025
886
/* This process has not completed. Does it have any output? */
1026
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
888
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
889
continue;
1030
890
}
1031
891
/* Before reading, make the process' data buffer large enough */
1032
892
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
893
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
894
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
895
if (proc->buffer == NULL){
1036
896
perror("malloc");
1037
897
exitstatus = EXIT_FAILURE;
1038
898
goto fallback;
1040
900
proc->buffer_size += BUFFER_SIZE;
1041
901
}
1042
902
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1046
906
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
907
continue;
1049
908
}
1050
if(sret == 0){
909
if(ret == 0){
1051
910
/* got EOF */
1052
911
proc->eof = true;
1053
912
} else {
1054
proc->buffer_length += (size_t) sret;
913
proc->buffer_length += (size_t) ret;
1055
914
}
1056
915
}
1057
916
}
1059
918
1060
919
fallback:
1061
920
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1063
922
/* Fallback if all plugins failed, none are found or an error
1064
923
occured */
1065
924
bool bret;
1066
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
926
char *passwordbuffer = getpass("Password: ");
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
928
if(not bret){
1076
929
perror("print_out_password");
1077
930
exitstatus = EXIT_FAILURE;
1084
937
perror("sigaction");
1085
938
exitstatus = EXIT_FAILURE;
1086
939
}
1087
940
1088
941
if(custom_argv != NULL){
1089
942
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1090
943
free(*arg);
1091
944
}
1092
945
free(custom_argv);
1093
946
}
947
free_plugin_list(plugin_list);
1094
948
1095
949
if(dir != NULL){
1096
950
closedir(dir);
1097
951
}
1098
952
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1108
961
}
962
free(process_list->buffer);
963
free(process_list);
1109
964
}
1110
965
1111
966
/* Wait for any remaining child processes to terminate */
1116
971
perror("wait");
1117
972
}
1118
973
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
1124
974
return exitstatus;
1125
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0