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- Committer: Björn Påhlsson
- Date: 2008-08-24 23:40:11 UTC
- mfrom: (102 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-20080824234011-vb6j0ekivqripwhk
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
}
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;
292
256
}
293
}
294
295
free(plugin_node);
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;
296
269
}
297
270
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
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);
301
283
}
302
284
}
303
285
304
286
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
287
const char *plugindir = "/lib/mandos/plugins.d";
288
const char *argfile = ARGFILE;
307
289
FILE *conffp;
308
290
size_t d_name_len;
309
291
DIR *dir = NULL;
310
292
struct dirent *dirst;
311
293
struct stat st;
312
294
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
295
int ret, maxfd = 0;
316
296
uid_t uid = 65534;
317
297
gid_t gid = 65534;
318
298
bool debug = false;
343
323
{ .name = "global-options", .key = 'g',
344
324
.arg = "OPTION[,OPTION[,...]]",
345
325
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
326
{ .name = "global-envs", .key = 'e',
347
327
.arg = "VAR=value",
348
328
.doc = "Environment variable passed to all plugins" },
349
329
{ .name = "options-for", .key = 'o',
350
330
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
331
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
332
{ .name = "envs-for", .key = 'f',
353
333
.arg = "PLUGIN:ENV=value",
354
334
.doc = "Environment variable passed to specified plugin" },
355
335
{ .name = "disable", .key = 'd',
356
336
.arg = "PLUGIN",
357
337
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
338
{ .name = "plugin-dir", .key = 128,
362
339
.arg = "DIRECTORY",
363
340
.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 },
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 },
375
349
{ .name = NULL }
376
350
};
377
351
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){
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;
356
switch (key) {
357
case 'g':
358
if (arg != NULL){
383
359
char *p;
384
360
while((p = strsep(&arg, ",")) != NULL){
385
361
if(p[0] == '\0'){
386
362
continue;
387
363
}
388
if(not add_argument(getplugin(NULL), p)){
364
if(not add_argument(getplugin(NULL, plugins), p)){
389
365
perror("add_argument");
390
366
return ARGP_ERR_UNKNOWN;
391
367
}
392
368
}
393
369
}
394
370
break;
395
case 'G': /* --global-env */
371
case 'e':
396
372
if(arg == NULL){
397
373
break;
398
374
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
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
}
401
383
}
402
384
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
385
case 'o':
386
if (arg != NULL){
405
387
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
388
if(p_name[0] == '\0'){
407
389
break;
408
390
}
409
391
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
392
if(opt[0] == '\0'){
411
393
break;
412
394
}
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;
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
}
421
405
}
422
406
}
423
407
}
424
408
break;
425
case 'E': /* --env-for */
409
case 'f':
426
410
if(arg == NULL){
427
411
break;
428
412
}
431
415
if(envdef == NULL){
432
416
break;
433
417
}
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
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)){
436
424
perror("add_environment");
437
425
}
438
426
}
439
427
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
428
case 'd':
429
if (arg != NULL){
430
plugin *p = getplugin(arg, plugins);
443
431
if(p == NULL){
444
432
return ARGP_ERR_UNKNOWN;
445
433
}
446
434
p->disabled = true;
447
435
}
448
436
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 */
437
case 128:
438
plugindir = arg;
439
break;
440
case 129:
441
uid = (uid_t)strtol(arg, NULL, 10);
442
break;
443
case 130:
444
gid = (gid_t)strtol(arg, NULL, 10);
445
break;
446
case 131:
489
447
debug = true;
490
448
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 = "",
449
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]",
547
464
.doc = "Mandos plugin runner -- Run plugins" };
548
465
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){
466
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
467
if (ret == ARGP_ERR_UNKNOWN){
553
468
fprintf(stderr, "Unknown error while parsing arguments\n");
554
469
exitstatus = EXIT_FAILURE;
555
470
goto fallback;
556
471
}
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
}
472
473
conffp = fopen(argfile, "r");
567
474
if(conffp != NULL){
568
475
char *org_line = NULL;
569
476
char *p, *arg, *new_arg, *line;
570
477
size_t size = 0;
478
ssize_t sret;
571
479
const char whitespace_delims[] = " \r\t\f\v\n";
572
480
const char comment_delim[] = "#";
573
481
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
586
482
while(true){
587
483
sret = getline(&org_line, &size, conffp);
588
484
if(sret == -1){
596
492
continue;
597
493
}
598
494
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
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
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
}
617
501
}
618
502
}
619
503
free(org_line);
620
} else {
504
} else{
621
505
/* Check for harmful errors and go to fallback. Other errors might
622
506
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
507
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
508
perror("fopen");
625
509
exitstatus = EXIT_FAILURE;
626
510
goto fallback;
627
511
}
628
512
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
513
631
514
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){
515
custom_argv[0] = argv[0];
516
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
517
if (ret == ARGP_ERR_UNKNOWN){
635
518
fprintf(stderr, "Unknown error while parsing arguments\n");
636
519
exitstatus = EXIT_FAILURE;
637
520
goto fallback;
638
521
}
639
522
}
640
523
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
524
if(debug){
651
525
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
526
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
528
for(char **a = p->argv; *a != NULL; a++){
655
529
fprintf(stderr, "\tArg: %s\n", *a);
656
530
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
531
fprintf(stderr, "...and %u environment variables\n", p->envc);
658
532
for(char **a = p->environ; *a != NULL; a++){
659
533
fprintf(stderr, "\t%s\n", *a);
660
534
}
661
535
}
662
536
}
663
537
664
/* Strip permissions down to nobody */
665
538
ret = setuid(uid);
666
if(ret == -1){
539
if (ret == -1){
667
540
perror("setuid");
668
}
541
}
542
669
543
setgid(gid);
670
if(ret == -1){
544
if (ret == -1){
671
545
perror("setgid");
672
546
}
673
547
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
548
dir = opendir(plugindir);
680
549
if(dir == NULL){
681
550
perror("Could not open plugin dir");
682
551
exitstatus = EXIT_FAILURE;
698
567
699
568
FD_ZERO(&rfds_all);
700
569
701
/* Read and execute any executable in the plugin directory*/
702
570
while(true){
703
571
dirst = readdir(dir);
704
572
705
/* All directory entries have been processed */
573
// All directory entries have been processed
706
574
if(dirst == NULL){
707
if(errno == EBADF){
575
if (errno == EBADF){
708
576
perror("readdir");
709
577
exitstatus = EXIT_FAILURE;
710
578
goto fallback;
714
582
715
583
d_name_len = strlen(dirst->d_name);
716
584
717
/* Ignore dotfiles, backup files and other junk */
585
// Ignore dotfiles, backup files and other junk
718
586
{
719
587
bool bad_name = false;
720
588
722
590
723
591
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
592
".dpkg-old",
725
".dpkg-bak",
726
593
".dpkg-divert", NULL };
727
594
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
595
size_t pre_len = strlen(*pre);
736
603
break;
737
604
}
738
605
}
606
739
607
if(bad_name){
740
608
continue;
741
609
}
610
742
611
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
612
size_t suf_len = strlen(*suf);
744
613
if((d_name_len >= suf_len)
759
628
}
760
629
761
630
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
}
631
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
632
if(ret < 0){
768
633
perror("asprintf");
769
634
continue;
770
635
}
771
636
772
637
ret = stat(filename, &st);
773
if(ret == -1){
638
if (ret == -1){
774
639
perror("stat");
775
640
free(filename);
776
641
continue;
777
642
}
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
643
644
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
645
if(debug){
782
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
647
" with bad type or mode\n", filename);
785
649
free(filename);
786
650
continue;
787
651
}
788
789
plugin *p = getplugin(dirst->d_name);
652
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
653
if(p == NULL){
791
654
perror("getplugin");
792
655
free(filename);
802
665
}
803
666
{
804
667
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
668
plugin *g = getplugin(NULL, &plugin_list);
806
669
if(g != NULL){
807
670
for(char **a = g->argv + 1; *a != NULL; a++){
808
671
if(not add_argument(p, *a)){
811
674
}
812
675
/* Add global environment variables */
813
676
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
677
if(not add_environment(p, *e)){
815
678
perror("add_environment");
816
679
}
817
680
}
822
685
process, too. */
823
686
if(p->environ[0] != NULL){
824
687
for(char **e = environ; *e != NULL; e++){
825
if(not add_environment(p, *e, false)){
688
char *copy = strdup(*e);
689
if(copy == NULL){
690
perror("strdup");
691
continue;
692
}
693
if(not add_environment(p, copy)){
826
694
perror("add_environment");
827
695
}
828
696
}
830
698
831
699
int pipefd[2];
832
700
ret = pipe(pipefd);
833
if(ret == -1){
701
if (ret == -1){
834
702
perror("pipe");
835
703
exitstatus = EXIT_FAILURE;
836
704
goto fallback;
837
705
}
838
/* Ask OS to automatic close the pipe on exec */
839
706
ret = set_cloexec_flag(pipefd[0]);
840
707
if(ret < 0){
841
708
perror("set_cloexec_flag");
849
716
goto fallback;
850
717
}
851
718
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
719
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
720
if(ret < 0){
854
721
perror("sigprocmask");
855
722
exitstatus = EXIT_FAILURE;
856
723
goto fallback;
857
724
}
858
/* Starting a new process to be watched */
725
// Starting a new process to be watched
859
726
pid_t pid = fork();
860
727
if(pid == -1){
861
728
perror("fork");
869
736
perror("sigaction");
870
737
_exit(EXIT_FAILURE);
871
738
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
739
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
740
if(ret < 0){
874
741
perror("sigprocmask");
875
742
_exit(EXIT_FAILURE);
876
743
}
877
744
878
745
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
746
if(ret == -1){
880
747
perror("dup2");
899
766
}
900
767
/* no return */
901
768
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
769
/* parent process */
904
770
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);
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");
775
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
776
if(ret < 0){
910
perror("sigprocmask");
777
perror("sigprocmask");
911
778
}
912
779
exitstatus = EXIT_FAILURE;
913
780
goto fallback;
914
781
}
915
782
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
783
*new_process = (struct process){ .pid = pid,
784
.fd = pipefd[0],
785
.next = process_list };
786
// List handling
787
process_list = new_process;
919
788
/* Unblock SIGCHLD so signal handler can be run if this process
920
789
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
790
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
791
if(ret < 0){
923
792
perror("sigprocmask");
924
793
exitstatus = EXIT_FAILURE;
925
794
goto fallback;
926
795
}
927
796
928
FD_SET(new_plugin->fd, &rfds_all);
797
FD_SET(new_process->fd, &rfds_all);
929
798
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
799
if (maxfd < new_process->fd){
800
maxfd = new_process->fd;
932
801
}
802
933
803
}
934
804
805
free_plugin_list(plugin_list);
806
plugin_list = NULL;
807
935
808
closedir(dir);
936
809
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
}
810
811
if (process_list == NULL){
812
fprintf(stderr, "No plugin processes started. Incorrect plugin"
813
" directory?\n");
814
process_list = NULL;
947
815
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
816
while(process_list){
951
817
fd_set rfds = rfds_all;
952
818
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
819
if (select_ret == -1){
954
820
perror("select");
955
821
exitstatus = EXIT_FAILURE;
956
822
goto fallback;
957
823
}
958
824
/* OK, now either a process completed, or something can be read
959
825
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
826
for(process *proc = process_list; proc ; proc = proc->next){
961
827
/* Is this process completely done? */
962
828
if(proc->eof and proc->completed){
963
829
/* Only accept the plugin output if it exited cleanly */
964
830
if(not WIFEXITED(proc->status)
965
831
or WEXITSTATUS(proc->status) != 0){
966
832
/* Bad exit by plugin */
967
968
833
if(debug){
969
834
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
835
fprintf(stderr, "Plugin %u exited with status %d\n",
836
(unsigned int) (proc->pid),
972
837
WEXITSTATUS(proc->status));
973
838
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
839
fprintf(stderr, "Plugin %u killed by signal %d\n",
840
(unsigned int) (proc->pid),
976
841
WTERMSIG(proc->status));
977
842
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
843
fprintf(stderr, "Plugin %d dumped core\n",
844
(unsigned int) (proc->pid));
980
845
}
981
846
}
982
983
847
/* Remove the plugin */
984
848
FD_CLR(proc->fd, &rfds_all);
985
986
849
/* Block signal while modifying process_list */
987
850
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
851
if(ret < 0){
990
853
exitstatus = EXIT_FAILURE;
991
854
goto fallback;
992
855
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
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
}
998
869
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
870
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
871
NULL);
1001
872
if(ret < 0){
1002
873
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
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;
1012
881
}
1013
1014
882
/* This process exited nicely, so print its buffer */
1015
883
1016
884
bool bret = print_out_password(proc->buffer,
1017
885
proc->buffer_length);
1018
886
if(not bret){
1021
889
}
1022
890
goto fallback;
1023
891
}
1024
1025
892
/* This process has not completed. Does it have any output? */
1026
893
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
894
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
895
continue;
1030
896
}
1031
897
/* Before reading, make the process' data buffer large enough */
1032
898
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
899
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
900
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
901
if (proc->buffer == NULL){
1036
902
perror("malloc");
1037
903
exitstatus = EXIT_FAILURE;
1038
904
goto fallback;
1040
906
proc->buffer_size += BUFFER_SIZE;
1041
907
}
1042
908
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
909
ret = read(proc->fd, proc->buffer + proc->buffer_length,
910
BUFFER_SIZE);
911
if(ret < 0){
1046
912
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
913
continue;
1049
914
}
1050
if(sret == 0){
915
if(ret == 0){
1051
916
/* got EOF */
1052
917
proc->eof = true;
1053
918
} else {
1054
proc->buffer_length += (size_t) sret;
919
proc->buffer_length += (size_t) ret;
1055
920
}
1056
921
}
1057
922
}
1059
924
1060
925
fallback:
1061
926
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1063
928
/* Fallback if all plugins failed, none are found or an error
1064
929
occured */
1065
930
bool bret;
1066
931
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
932
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);
933
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
934
if(not bret){
1076
935
perror("print_out_password");
1077
936
exitstatus = EXIT_FAILURE;
1084
943
perror("sigaction");
1085
944
exitstatus = EXIT_FAILURE;
1086
945
}
1087
946
1088
947
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
948
for(char **arg = custom_argv; *arg != NULL; arg++){
1090
949
free(*arg);
1091
950
}
1092
951
free(custom_argv);
1093
952
}
953
free_plugin_list(plugin_list);
1094
954
1095
955
if(dir != NULL){
1096
956
closedir(dir);
1097
957
}
1098
958
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
}
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");
1108
967
}
968
free(process_list->buffer);
969
free(process_list);
1109
970
}
1110
971
1111
972
/* Wait for any remaining child processes to terminate */
1116
977
perror("wait");
1117
978
}
1118
979
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
1124
980
return exitstatus;
1125
981
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0