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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:35:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113043519-0yr39snphoegq8l1
* plugin-runner.c: Only space changes.
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
62
#include <signal.h> /* struct sigaction, sigemptyset(),
61
63
sigaddset(), sigaction(),
62
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
66
#include <errno.h> /* errno, EBADF */
65
67
66
68
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
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;
70
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
75
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
86
76
typedef struct plugin{
87
77
char *name; /* can be NULL or any plugin name */
88
78
char **argv;
90
80
char **environ;
91
81
int envc;
92
82
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 *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
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){
103
if((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
100
105
return p;
101
106
}
102
107
}
103
108
/* Create a new plugin */
104
109
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
110
if(new_plugin == NULL){
106
111
return NULL;
107
112
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
113
char *copy_name = NULL;
114
if(name != NULL){
115
copy_name = strdup(name);
116
if(copy_name == NULL){
117
return NULL;
118
}
111
119
}
112
120
113
121
*new_plugin = (plugin) { .name = copy_name,
114
122
.argc = 1,
115
.envc = 0,
116
123
.disabled = false,
117
.next = *plugin_list };
124
.next = plugin_list };
118
125
119
126
new_plugin->argv = malloc(sizeof(char *) * 2);
120
if (new_plugin->argv == NULL){
127
if(new_plugin->argv == NULL){
128
free(copy_name);
121
129
free(new_plugin);
122
130
return NULL;
123
131
}
124
132
new_plugin->argv[0] = copy_name;
125
133
new_plugin->argv[1] = NULL;
126
134
127
135
new_plugin->environ = malloc(sizeof(char *));
128
136
if(new_plugin->environ == NULL){
137
free(copy_name);
129
138
free(new_plugin->argv);
130
139
free(new_plugin);
131
140
return NULL;
132
141
}
133
142
new_plugin->environ[0] = NULL;
143
134
144
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
136
146
return new_plugin;
137
147
}
138
148
168
178
}
169
179
170
180
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
172
182
if(p == NULL){
173
183
return false;
174
184
}
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
}
175
202
return add_to_char_array(def, &(p->environ), &(p->envc));
176
203
}
177
204
178
179
205
/*
180
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
207
* Descriptor Flags".
182
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
183
209
*/
184
static int set_cloexec_flag(int fd)
185
{
210
static int set_cloexec_flag(int fd){
186
211
int ret = fcntl(fd, F_GETFD, 0);
187
212
/* If reading the flags failed, return error indication now. */
188
213
if(ret < 0){
192
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
193
218
}
194
219
195
process *process_list = NULL;
196
220
197
/* Mark a process as completed when it exits, and save its exit
221
/* Mark processes as completed when they exit, and save their exit
198
222
status. */
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;
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
}
216
251
}
217
252
218
bool print_out_password(const char *buffer, size_t length){
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
219
255
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
256
for(size_t written = 0; written < length; written += (size_t)ret){
224
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
258
length - written));
230
263
return true;
231
264
}
232
265
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;
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
}
239
290
}
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;
291
}
292
293
free(plugin_node);
252
294
}
253
295
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
}
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
299
}
268
300
}
269
301
270
302
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
303
char *plugindir = NULL;
304
char *argfile = NULL;
273
305
FILE *conffp;
274
306
size_t d_name_len;
275
307
DIR *dir = NULL;
277
309
struct stat st;
278
310
fd_set rfds_all;
279
311
int ret, maxfd = 0;
312
ssize_t sret;
280
313
uid_t uid = 65534;
281
314
gid_t gid = 65534;
282
315
bool debug = false;
298
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
332
if(ret == -1){
300
333
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
334
exitstatus = EXIT_FAILURE;
302
335
goto fallback;
303
336
}
304
337
307
340
{ .name = "global-options", .key = 'g',
308
341
.arg = "OPTION[,OPTION[,...]]",
309
342
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
343
{ .name = "global-env", .key = 'G',
311
344
.arg = "VAR=value",
312
345
.doc = "Environment variable passed to all plugins" },
313
346
{ .name = "options-for", .key = 'o',
314
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
348
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
349
{ .name = "env-for", .key = 'E',
317
350
.arg = "PLUGIN:ENV=value",
318
351
.doc = "Environment variable passed to specified plugin" },
319
352
{ .name = "disable", .key = 'd',
320
353
.arg = "PLUGIN",
321
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
322
358
{ .name = "plugin-dir", .key = 128,
323
359
.arg = "DIRECTORY",
324
360
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
333
372
{ .name = NULL }
334
373
};
335
374
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;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
378
case 'g': /* --global-options */
379
if(arg != NULL){
343
380
char *p;
344
381
while((p = strsep(&arg, ",")) != NULL){
345
382
if(p[0] == '\0'){
346
383
continue;
347
384
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
385
if(not add_argument(getplugin(NULL), p)){
349
386
perror("add_argument");
350
387
return ARGP_ERR_UNKNOWN;
351
388
}
352
389
}
353
390
}
354
391
break;
355
case 'e':
392
case 'G': /* --global-env */
356
393
if(arg == NULL){
357
394
break;
358
395
}
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
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
367
398
}
368
399
break;
369
case 'o':
370
if (arg != NULL){
400
case 'o': /* --options-for */
401
if(arg != NULL){
371
402
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
403
if(p_name[0] == '\0' or arg == NULL){
373
404
break;
374
405
}
375
406
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
407
if(opt[0] == '\0' or opt == NULL){
377
408
break;
378
409
}
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
}
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;
389
418
}
390
419
}
391
420
}
392
421
break;
393
case 'f':
422
case 'E': /* --env-for */
394
423
if(arg == NULL){
395
424
break;
396
425
}
399
428
if(envdef == NULL){
400
429
break;
401
430
}
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)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
408
433
perror("add_environment");
409
434
}
410
435
}
411
436
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
415
440
if(p == NULL){
416
441
return ARGP_ERR_UNKNOWN;
417
442
}
418
443
p->disabled = true;
419
444
}
420
445
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
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 */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
471
}
472
break;
473
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
479
}
480
break;
481
case 132: /* --debug */
431
482
debug = true;
432
483
break;
433
case ARGP_KEY_ARG:
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]",
484
/*
485
* When adding more options before this line, remember to also add a
486
* "case" to the "parse_opt_config_file" function below.
487
*/
488
case ARGP_KEY_ARG:
489
/* Cryptsetup always passes an argument, which is an empty
490
string if "none" was specified in /etc/crypttab. So if
491
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
494
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
default:
499
return ARGP_ERR_UNKNOWN;
500
}
501
return 0;
502
}
503
504
/* This option parser is the same as parse_opt() above, except it
505
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file(int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
switch(key) {
510
case 'g': /* --global-options */
511
case 'G': /* --global-env */
512
case 'o': /* --options-for */
513
case 'E': /* --env-for */
514
case 'd': /* --disable */
515
case 'e': /* --enable */
516
case 128: /* --plugin-dir */
517
break;
518
case 129: /* --config-file */
519
free(argfile);
520
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
525
case 130: /* --userid */
526
case 131: /* --groupid */
527
case 132: /* --debug */
528
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
break;
531
default:
532
return ARGP_ERR_UNKNOWN;
533
}
534
return 0;
535
}
536
537
struct argp argp = { .options = options,
538
.parser = parse_opt_config_file,
539
.args_doc = "",
448
540
.doc = "Mandos plugin runner -- Run plugins" };
449
541
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
542
/* Parse using parse_opt_config_file() in order to get the custom
543
config file location, if any. */
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
452
546
fprintf(stderr, "Unknown error while parsing arguments\n");
453
547
exitstatus = EXIT_FAILURE;
454
548
goto fallback;
455
549
}
456
457
conffp = fopen(argfile, "r");
550
551
/* Reset to the normal argument parser */
552
argp.parser = parse_opt;
553
554
/* Open the configfile if available */
555
if(argfile == NULL){
556
conffp = fopen(AFILE, "r");
557
} else {
558
conffp = fopen(argfile, "r");
559
}
458
560
if(conffp != NULL){
459
561
char *org_line = NULL;
460
562
char *p, *arg, *new_arg, *line;
461
563
size_t size = 0;
462
ssize_t sret;
463
564
const char whitespace_delims[] = " \r\t\f\v\n";
464
565
const char comment_delim[] = "#";
465
566
567
custom_argc = 1;
568
custom_argv = malloc(sizeof(char*) * 2);
569
if(custom_argv == NULL){
570
perror("malloc");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
573
}
574
custom_argv[0] = argv[0];
575
custom_argv[1] = NULL;
576
577
/* for each line in the config file, strip whitespace and ignore
578
commented text */
466
579
while(true){
467
580
sret = getline(&org_line, &size, conffp);
468
581
if(sret == -1){
476
589
continue;
477
590
}
478
591
new_arg = strdup(p);
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
}
592
if(new_arg == NULL){
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
595
free(org_line);
596
goto fallback;
597
}
598
599
custom_argc += 1;
600
custom_argv = realloc(custom_argv, sizeof(char *)
601
* ((unsigned int) custom_argc + 1));
602
if(custom_argv == NULL){
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
605
free(org_line);
606
goto fallback;
607
}
608
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
485
610
}
486
611
}
487
612
free(org_line);
488
} else{
613
} else {
489
614
/* Check for harmful errors and go to fallback. Other errors might
490
615
not affect opening plugins */
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
616
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
492
617
perror("fopen");
493
618
exitstatus = EXIT_FAILURE;
494
619
goto fallback;
495
620
}
496
621
}
497
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
498
624
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
502
628
fprintf(stderr, "Unknown error while parsing arguments\n");
503
629
exitstatus = EXIT_FAILURE;
504
630
goto fallback;
505
631
}
506
632
}
507
633
634
/* Parse actual command line arguments, to let them override the
635
config file */
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
640
goto fallback;
641
}
642
508
643
if(debug){
509
644
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
645
fprintf(stderr, "Plugin: %s has %d arguments\n",
519
654
}
520
655
}
521
656
657
/* Strip permissions down to nobody */
522
658
ret = setuid(uid);
523
if (ret == -1){
659
if(ret == -1){
524
660
perror("setuid");
525
}
526
661
}
527
662
setgid(gid);
528
if (ret == -1){
663
if(ret == -1){
529
664
perror("setgid");
530
665
}
531
666
532
dir = opendir(plugindir);
667
if(plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
533
673
if(dir == NULL){
534
674
perror("Could not open plugin dir");
535
675
exitstatus = EXIT_FAILURE;
551
691
552
692
FD_ZERO(&rfds_all);
553
693
694
/* Read and execute any executable in the plugin directory*/
554
695
while(true){
555
696
dirst = readdir(dir);
556
697
557
// All directory entries have been processed
698
/* All directory entries have been processed */
558
699
if(dirst == NULL){
559
if (errno == EBADF){
700
if(errno == EBADF){
560
701
perror("readdir");
561
702
exitstatus = EXIT_FAILURE;
562
703
goto fallback;
566
707
567
708
d_name_len = strlen(dirst->d_name);
568
709
569
// Ignore dotfiles, backup files and other junk
710
/* Ignore dotfiles, backup files and other junk */
570
711
{
571
712
bool bad_name = false;
572
713
574
715
575
716
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
576
717
".dpkg-old",
718
".dpkg-bak",
577
719
".dpkg-divert", NULL };
578
720
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
579
721
size_t pre_len = strlen(*pre);
587
729
break;
588
730
}
589
731
}
590
591
732
if(bad_name){
592
733
continue;
593
734
}
594
595
735
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
736
size_t suf_len = strlen(*suf);
597
737
if((d_name_len >= suf_len)
612
752
}
613
753
614
754
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
755
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
757
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
759
}
616
760
if(ret < 0){
617
761
perror("asprintf");
618
762
continue;
619
763
}
620
764
621
765
ret = stat(filename, &st);
622
if (ret == -1){
766
if(ret == -1){
623
767
perror("stat");
624
768
free(filename);
625
769
continue;
626
770
}
627
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
771
772
/* Ignore non-executable files */
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
629
774
if(debug){
630
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
631
776
" with bad type or mode\n", filename);
633
778
free(filename);
634
779
continue;
635
780
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
781
782
plugin *p = getplugin(dirst->d_name);
637
783
if(p == NULL){
638
784
perror("getplugin");
639
785
free(filename);
649
795
}
650
796
{
651
797
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
798
plugin *g = getplugin(NULL);
653
799
if(g != NULL){
654
800
for(char **a = g->argv + 1; *a != NULL; a++){
655
801
if(not add_argument(p, *a)){
658
804
}
659
805
/* Add global environment variables */
660
806
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
807
if(not add_environment(p, *e, false)){
662
808
perror("add_environment");
663
809
}
664
810
}
669
815
process, too. */
670
816
if(p->environ[0] != NULL){
671
817
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
818
if(not add_environment(p, *e, false)){
678
819
perror("add_environment");
679
820
}
680
821
}
681
822
}
682
823
683
int pipefd[2];
824
int pipefd[2];
684
825
ret = pipe(pipefd);
685
if (ret == -1){
826
if(ret == -1){
686
827
perror("pipe");
687
828
exitstatus = EXIT_FAILURE;
688
829
goto fallback;
689
830
}
831
/* Ask OS to automatic close the pipe on exec */
690
832
ret = set_cloexec_flag(pipefd[0]);
691
833
if(ret < 0){
692
834
perror("set_cloexec_flag");
700
842
goto fallback;
701
843
}
702
844
/* Block SIGCHLD until process is safely in process list */
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
704
846
if(ret < 0){
705
847
perror("sigprocmask");
706
848
exitstatus = EXIT_FAILURE;
707
849
goto fallback;
708
850
}
709
// Starting a new process to be watched
851
/* Starting a new process to be watched */
710
852
pid_t pid = fork();
711
853
if(pid == -1){
712
854
perror("fork");
720
862
perror("sigaction");
721
863
_exit(EXIT_FAILURE);
722
864
}
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
724
866
if(ret < 0){
725
867
perror("sigprocmask");
726
868
_exit(EXIT_FAILURE);
727
869
}
728
870
729
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
730
872
if(ret == -1){
731
873
perror("dup2");
750
892
}
751
893
/* no return */
752
894
}
753
/* parent process */
895
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
754
897
free(filename);
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");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
898
plugin *new_plugin = getplugin(dirst->d_name);
899
if(new_plugin == NULL){
900
perror("getplugin");
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
760
902
if(ret < 0){
761
perror("sigprocmask");
903
perror("sigprocmask");
762
904
}
763
905
exitstatus = EXIT_FAILURE;
764
906
goto fallback;
765
907
}
766
908
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
909
new_plugin->pid = pid;
910
new_plugin->fd = pipefd[0];
911
772
912
/* Unblock SIGCHLD so signal handler can be run if this process
773
913
has already completed */
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
775
915
if(ret < 0){
776
916
perror("sigprocmask");
777
917
exitstatus = EXIT_FAILURE;
778
918
goto fallback;
779
919
}
780
920
781
FD_SET(new_process->fd, &rfds_all);
921
FD_SET(new_plugin->fd, &rfds_all);
782
922
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
923
if(maxfd < new_plugin->fd){
924
maxfd = new_plugin->fd;
785
925
}
786
787
926
}
788
927
789
free_plugin_list(plugin_list);
790
791
928
closedir(dir);
792
929
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
930
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
if(p->pid != 0){
933
break;
934
}
935
if(p->next == NULL){
936
fprintf(stderr, "No plugin processes started. Incorrect plugin"
937
" directory?\n");
938
free_plugin_list();
939
}
798
940
}
799
while(process_list){
941
942
/* Main loop while running plugins exist */
943
while(plugin_list){
800
944
fd_set rfds = rfds_all;
801
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
if (select_ret == -1){
946
if(select_ret == -1){
803
947
perror("select");
804
948
exitstatus = EXIT_FAILURE;
805
949
goto fallback;
806
950
}
807
951
/* OK, now either a process completed, or something can be read
808
952
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
953
for(plugin *proc = plugin_list; proc != NULL;){
810
954
/* Is this process completely done? */
811
955
if(proc->eof and proc->completed){
812
956
/* Only accept the plugin output if it exited cleanly */
813
957
if(not WIFEXITED(proc->status)
814
958
or WEXITSTATUS(proc->status) != 0){
815
959
/* Bad exit by plugin */
960
816
961
if(debug){
817
962
if(WIFEXITED(proc->status)){
818
963
fprintf(stderr, "Plugin %u exited with status %d\n",
823
968
(unsigned int) (proc->pid),
824
969
WTERMSIG(proc->status));
825
970
} else if(WCOREDUMP(proc->status)){
826
fprintf(stderr, "Plugin %d dumped core\n",
971
fprintf(stderr, "Plugin %u dumped core\n",
827
972
(unsigned int) (proc->pid));
828
973
}
829
974
}
975
830
976
/* Remove the plugin */
831
977
FD_CLR(proc->fd, &rfds_all);
978
832
979
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
981
if(ret < 0){
835
982
perror("sigprocmask");
836
983
exitstatus = EXIT_FAILURE;
837
984
goto fallback;
838
985
}
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
}
986
987
plugin *next_plugin = proc->next;
988
free_plugin(proc);
989
proc = next_plugin;
990
852
991
/* We are done modifying process list, so unblock signal */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
855
994
if(ret < 0){
856
995
perror("sigprocmask");
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;
996
exitstatus = EXIT_FAILURE;
997
goto fallback;
998
}
999
1000
if(plugin_list == NULL){
1001
break;
1002
}
1003
1004
continue;
864
1005
}
1006
865
1007
/* This process exited nicely, so print its buffer */
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1008
1009
bool bret = print_out_password(proc->buffer,
1010
proc->buffer_length);
868
1011
if(not bret){
869
1012
perror("print_out_password");
870
1013
exitstatus = EXIT_FAILURE;
871
1014
}
872
1015
goto fallback;
873
1016
}
1017
874
1018
/* This process has not completed. Does it have any output? */
875
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1020
/* This process had nothing to say at this time */
1021
proc = proc->next;
877
1022
continue;
878
1023
}
879
1024
/* Before reading, make the process' data buffer large enough */
880
1025
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
881
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
882
1027
+ (size_t) BUFFER_SIZE);
883
if (proc->buffer == NULL){
1028
if(proc->buffer == NULL){
884
1029
perror("malloc");
885
1030
exitstatus = EXIT_FAILURE;
886
1031
goto fallback;
888
1033
proc->buffer_size += BUFFER_SIZE;
889
1034
}
890
1035
/* Read from the process */
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1038
if(sret < 0){
894
1039
/* Read error from this process; ignore the error */
1040
proc = proc->next;
895
1041
continue;
896
1042
}
897
if(ret == 0){
1043
if(sret == 0){
898
1044
/* got EOF */
899
1045
proc->eof = true;
900
1046
} else {
901
proc->buffer_length += (size_t) ret;
1047
proc->buffer_length += (size_t) sret;
902
1048
}
903
1049
}
904
1050
}
906
1052
907
1053
fallback:
908
1054
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1056
/* Fallback if all plugins failed, none are found or an error
1057
occured */
911
1058
bool bret;
912
1059
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1060
char *passwordbuffer = getpass("Password: ");
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1061
size_t len = strlen(passwordbuffer);
1062
/* Strip trailing newline */
1063
if(len > 0 and passwordbuffer[len-1] == '\n'){
1064
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1065
len--;
1066
}
1067
bret = print_out_password(passwordbuffer, len);
915
1068
if(not bret){
916
1069
perror("print_out_password");
917
1070
exitstatus = EXIT_FAILURE;
924
1077
perror("sigaction");
925
1078
exitstatus = EXIT_FAILURE;
926
1079
}
927
1080
928
1081
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1082
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1083
free(*arg);
931
1084
}
932
1085
free(custom_argv);
933
1086
}
934
free_plugin_list(plugin_list);
935
1087
936
1088
if(dir != NULL){
937
1089
closedir(dir);
938
1090
}
939
1091
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");
1092
/* Kill the processes */
1093
for(plugin *p = plugin_list; p != NULL; p = p->next){
1094
if(p->pid != 0){
1095
close(p->fd);
1096
ret = kill(p->pid, SIGTERM);
1097
if(ret == -1 and errno != ESRCH){
1098
/* Set-uid proccesses might not get closed */
1099
perror("kill");
1100
}
948
1101
}
949
free(process_list->buffer);
950
free(process_list);
951
1102
}
952
1103
953
1104
/* Wait for any remaining child processes to terminate */
958
1109
perror("wait");
959
1110
}
960
1111
1112
free_plugin_list();
1113
1114
free(plugindir);
1115
free(argfile);
1116
961
1117
return exitstatus;
962
1118
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0