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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:39:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20090905173934-gs0r858omhudc71m
* plugin-runner.c (main): Move variables "tmpmax" and "tmp" into
the innermost scope possible.
the innermost scope possible.
- 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
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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,
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
66
71
67
72
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
73
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
77
const char *argp_program_version = "plugin-runner " VERSION;
71
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
79
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
87
80
typedef struct plugin{
88
81
char *name; /* can be NULL or any plugin name */
89
82
char **argv;
91
84
char **environ;
92
85
int envc;
93
86
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
94
97
struct plugin *next;
95
98
} plugin;
96
99
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))){
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
101
109
return p;
102
110
}
103
111
}
104
112
/* Create a new plugin */
105
113
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
114
if(new_plugin == NULL){
107
115
return NULL;
108
116
}
109
117
char *copy_name = NULL;
110
118
if(name != NULL){
111
119
copy_name = strdup(name);
112
120
if(copy_name == NULL){
121
free(new_plugin);
113
122
return NULL;
114
123
}
115
124
}
116
125
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
122
130
123
131
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
132
if(new_plugin->argv == NULL){
125
133
free(copy_name);
126
134
free(new_plugin);
127
135
return NULL;
128
136
}
129
137
new_plugin->argv[0] = copy_name;
130
138
new_plugin->argv[1] = NULL;
131
139
132
140
new_plugin->environ = malloc(sizeof(char *));
133
141
if(new_plugin->environ == NULL){
134
142
free(copy_name);
137
145
return NULL;
138
146
}
139
147
new_plugin->environ[0] = NULL;
148
140
149
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
150
plugin_list = new_plugin;
142
151
return new_plugin;
143
152
}
144
153
174
183
}
175
184
176
185
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
186
static bool add_environment(plugin *p, const char *def, bool replace){
178
187
if(p == NULL){
179
188
return false;
180
189
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
181
207
return add_to_char_array(def, &(p->environ), &(p->envc));
182
208
}
183
209
184
185
210
/*
186
211
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
212
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
214
*/
190
static int set_cloexec_flag(int fd)
191
{
215
static int set_cloexec_flag(int fd){
192
216
int ret = fcntl(fd, F_GETFD, 0);
193
217
/* If reading the flags failed, return error indication now. */
194
218
if(ret < 0){
198
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
223
}
200
224
201
process *process_list = NULL;
202
225
203
226
/* Mark processes as completed when they exit, and save their exit
204
227
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
206
230
while(true){
207
process *proc = process_list;
231
plugin *proc = plugin_list;
208
232
int status;
209
233
pid_t pid = waitpid(-1, &status, WNOHANG);
210
234
if(pid == 0){
212
236
break;
213
237
}
214
238
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
217
242
}
218
/* No child processes */
219
break;
243
perror("waitpid");
220
244
}
221
245
222
246
/* A child exited, find it in process_list */
223
247
while(proc != NULL and proc->pid != pid){
224
248
proc = proc->next;
228
252
continue;
229
253
}
230
254
proc->status = status;
231
proc->completed = true;
255
proc->completed = 1;
232
256
}
257
errno = old_errno;
233
258
}
234
259
235
bool print_out_password(const char *buffer, size_t length){
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
236
262
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
263
for(size_t written = 0; written < length; written += (size_t)ret){
241
264
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
265
length - written));
247
270
return true;
248
271
}
249
272
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);
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
297
}
298
}
299
300
free(plugin_node);
301
}
302
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
262
306
}
263
307
}
264
308
265
309
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
310
char *plugindir = NULL;
311
char *argfile = NULL;
268
312
FILE *conffp;
269
313
size_t d_name_len;
270
314
DIR *dir = NULL;
272
316
struct stat st;
273
317
fd_set rfds_all;
274
318
int ret, maxfd = 0;
319
ssize_t sret;
275
320
uid_t uid = 65534;
276
321
gid_t gid = 65534;
277
322
bool debug = false;
302
347
{ .name = "global-options", .key = 'g',
303
348
.arg = "OPTION[,OPTION[,...]]",
304
349
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
350
{ .name = "global-env", .key = 'G',
306
351
.arg = "VAR=value",
307
352
.doc = "Environment variable passed to all plugins" },
308
353
{ .name = "options-for", .key = 'o',
309
354
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
310
355
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
356
{ .name = "env-for", .key = 'E',
312
357
.arg = "PLUGIN:ENV=value",
313
358
.doc = "Environment variable passed to specified plugin" },
314
359
{ .name = "disable", .key = 'd',
315
360
.arg = "PLUGIN",
316
361
.doc = "Disable a specific plugin", .group = 1 },
362
{ .name = "enable", .key = 'e',
363
.arg = "PLUGIN",
364
.doc = "Enable a specific plugin", .group = 1 },
317
365
{ .name = "plugin-dir", .key = 128,
318
366
.arg = "DIRECTORY",
319
367
.doc = "Specify a different plugin directory", .group = 2 },
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 },
368
{ .name = "config-file", .key = 129,
369
.arg = "FILE",
370
.doc = "Specify a different configuration file", .group = 2 },
371
{ .name = "userid", .key = 130,
372
.arg = "ID", .flags = 0,
373
.doc = "User ID the plugins will run as", .group = 3 },
374
{ .name = "groupid", .key = 131,
375
.arg = "ID", .flags = 0,
376
.doc = "Group ID the plugins will run as", .group = 3 },
377
{ .name = "debug", .key = 132,
378
.doc = "Debug mode", .group = 4 },
328
379
{ .name = NULL }
329
380
};
330
381
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){
338
char *p;
339
while((p = strsep(&arg, ",")) != NULL){
340
if(p[0] == '\0'){
382
error_t parse_opt(int key, char *arg, __attribute__((unused))
383
struct argp_state *state){
384
switch(key){
385
char *tmp;
386
intmax_t tmpmax;
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
341
392
continue;
342
393
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
394
if(not add_argument(getplugin(NULL), plugin_option)){
344
395
perror("add_argument");
345
396
return ARGP_ERR_UNKNOWN;
346
397
}
347
398
}
348
399
}
349
400
break;
350
case 'e':
401
case 'G': /* --global-env */
351
402
if(arg == NULL){
352
403
break;
353
404
}
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
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
362
407
}
363
408
break;
364
case 'o':
365
if (arg != NULL){
366
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
368
break;
369
}
370
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
372
break;
373
}
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
}
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
384
420
}
385
421
}
386
422
}
387
423
break;
388
case 'f':
424
case 'E': /* --env-for */
389
425
if(arg == NULL){
390
426
break;
391
427
}
394
430
if(envdef == NULL){
395
431
break;
396
432
}
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)){
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
403
435
perror("add_environment");
404
436
}
405
437
}
406
438
break;
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
410
442
if(p == NULL){
411
443
return ARGP_ERR_UNKNOWN;
412
444
}
413
445
p->disabled = true;
414
446
}
415
447
break;
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:
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
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
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
426
490
debug = true;
427
491
break;
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]",
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
break;
539
default:
540
return ARGP_ERR_UNKNOWN;
541
}
542
return 0;
543
}
544
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
443
548
.doc = "Mandos plugin runner -- Run plugins" };
444
549
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
447
554
fprintf(stderr, "Unknown error while parsing arguments\n");
448
555
exitstatus = EXIT_FAILURE;
449
556
goto fallback;
450
557
}
451
452
conffp = fopen(argfile, "r");
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
564
conffp = fopen(AFILE, "r");
565
} else {
566
conffp = fopen(argfile, "r");
567
}
453
568
if(conffp != NULL){
454
569
char *org_line = NULL;
455
570
char *p, *arg, *new_arg, *line;
456
571
size_t size = 0;
457
ssize_t sret;
458
572
const char whitespace_delims[] = " \r\t\f\v\n";
459
573
const char comment_delim[] = "#";
460
574
461
575
custom_argc = 1;
462
576
custom_argv = malloc(sizeof(char*) * 2);
463
577
if(custom_argv == NULL){
468
582
custom_argv[0] = argv[0];
469
583
custom_argv[1] = NULL;
470
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
471
587
while(true){
472
588
sret = getline(&org_line, &size, conffp);
473
589
if(sret == -1){
474
590
break;
475
591
}
476
592
477
593
line = org_line;
478
594
arg = strsep(&line, comment_delim);
479
595
while((p = strsep(&arg, whitespace_delims)) != NULL){
481
597
continue;
482
598
}
483
599
new_arg = strdup(p);
484
600
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
603
free(org_line);
604
goto fallback;
605
}
606
485
607
custom_argc += 1;
486
608
custom_argv = realloc(custom_argv, sizeof(char *)
487
609
* ((unsigned int) custom_argc + 1));
492
614
goto fallback;
493
615
}
494
616
custom_argv[custom_argc-1] = new_arg;
495
custom_argv[custom_argc] = NULL;
617
custom_argv[custom_argc] = NULL;
496
618
}
497
619
}
620
do{
621
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
623
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
498
628
free(org_line);
499
} else{
629
} else {
500
630
/* Check for harmful errors and go to fallback. Other errors might
501
631
not affect opening plugins */
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
633
perror("fopen");
504
634
exitstatus = EXIT_FAILURE;
505
635
goto fallback;
506
636
}
507
637
}
508
638
/* If there was any arguments from configuration file,
639
pass them to parser as command arguments */
509
640
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
512
644
fprintf(stderr, "Unknown error while parsing arguments\n");
513
645
exitstatus = EXIT_FAILURE;
514
646
goto fallback;
515
647
}
516
648
}
517
649
650
/* Parse actual command line arguments, to let them override the
651
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
exitstatus = EXIT_FAILURE;
656
goto fallback;
657
}
658
518
659
if(debug){
519
660
for(plugin *p = plugin_list; p != NULL; p=p->next){
520
661
fprintf(stderr, "Plugin: %s has %d arguments\n",
522
663
for(char **a = p->argv; *a != NULL; a++){
523
664
fprintf(stderr, "\tArg: %s\n", *a);
524
665
}
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
666
fprintf(stderr, "...and %d environment variables\n", p->envc);
526
667
for(char **a = p->environ; *a != NULL; a++){
527
668
fprintf(stderr, "\t%s\n", *a);
528
669
}
529
670
}
530
671
}
531
672
673
/* Strip permissions down to nobody */
674
setgid(gid);
675
if(ret == -1){
676
perror("setgid");
677
}
532
678
ret = setuid(uid);
533
if (ret == -1){
679
if(ret == -1){
534
680
perror("setuid");
535
681
}
536
682
537
setgid(gid);
538
if (ret == -1){
539
perror("setgid");
683
if(plugindir == NULL){
684
dir = opendir(PDIR);
685
} else {
686
dir = opendir(plugindir);
540
687
}
541
688
542
dir = opendir(plugindir);
543
689
if(dir == NULL){
544
690
perror("Could not open plugin dir");
545
691
exitstatus = EXIT_FAILURE;
561
707
562
708
FD_ZERO(&rfds_all);
563
709
710
/* Read and execute any executable in the plugin directory*/
564
711
while(true){
565
712
dirst = readdir(dir);
566
713
567
// All directory entries have been processed
714
/* All directory entries have been processed */
568
715
if(dirst == NULL){
569
if (errno == EBADF){
716
if(errno == EBADF){
570
717
perror("readdir");
571
718
exitstatus = EXIT_FAILURE;
572
719
goto fallback;
576
723
577
724
d_name_len = strlen(dirst->d_name);
578
725
579
// Ignore dotfiles, backup files and other junk
726
/* Ignore dotfiles, backup files and other junk */
580
727
{
581
728
bool bad_name = false;
582
729
584
731
585
732
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
733
".dpkg-old",
734
".dpkg-bak",
587
735
".dpkg-divert", NULL };
588
736
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
737
size_t pre_len = strlen(*pre);
597
745
break;
598
746
}
599
747
}
600
601
748
if(bad_name){
602
749
continue;
603
750
}
604
605
751
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
752
size_t suf_len = strlen(*suf);
607
753
if((d_name_len >= suf_len)
620
766
continue;
621
767
}
622
768
}
623
769
624
770
char *filename;
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
771
if(plugindir == NULL){
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
773
} else {
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
775
}
626
776
if(ret < 0){
627
777
perror("asprintf");
628
778
continue;
629
779
}
630
780
631
781
ret = stat(filename, &st);
632
if (ret == -1){
782
if(ret == -1){
633
783
perror("stat");
634
784
free(filename);
635
785
continue;
636
786
}
637
787
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
788
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
639
790
if(debug){
640
791
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
641
792
" with bad type or mode\n", filename);
643
794
free(filename);
644
795
continue;
645
796
}
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
797
798
plugin *p = getplugin(dirst->d_name);
647
799
if(p == NULL){
648
800
perror("getplugin");
649
801
free(filename);
659
811
}
660
812
{
661
813
/* Add global arguments to argument list for this plugin */
662
plugin *g = getplugin(NULL, &plugin_list);
814
plugin *g = getplugin(NULL);
663
815
if(g != NULL){
664
816
for(char **a = g->argv + 1; *a != NULL; a++){
665
817
if(not add_argument(p, *a)){
668
820
}
669
821
/* Add global environment variables */
670
822
for(char **e = g->environ; *e != NULL; e++){
671
if(not add_environment(p, *e)){
823
if(not add_environment(p, *e, false)){
672
824
perror("add_environment");
673
825
}
674
826
}
679
831
process, too. */
680
832
if(p->environ[0] != NULL){
681
833
for(char **e = environ; *e != NULL; e++){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
834
if(not add_environment(p, *e, false)){
688
835
perror("add_environment");
689
836
}
690
837
}
692
839
693
840
int pipefd[2];
694
841
ret = pipe(pipefd);
695
if (ret == -1){
842
if(ret == -1){
696
843
perror("pipe");
697
844
exitstatus = EXIT_FAILURE;
698
845
goto fallback;
699
846
}
847
/* Ask OS to automatic close the pipe on exec */
700
848
ret = set_cloexec_flag(pipefd[0]);
701
849
if(ret < 0){
702
850
perror("set_cloexec_flag");
710
858
goto fallback;
711
859
}
712
860
/* Block SIGCHLD until process is safely in process list */
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
714
862
if(ret < 0){
715
863
perror("sigprocmask");
716
864
exitstatus = EXIT_FAILURE;
717
865
goto fallback;
718
866
}
719
// Starting a new process to be watched
867
/* Starting a new process to be watched */
720
868
pid_t pid = fork();
721
869
if(pid == -1){
722
870
perror("fork");
730
878
perror("sigaction");
731
879
_exit(EXIT_FAILURE);
732
880
}
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
881
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
734
882
if(ret < 0){
735
883
perror("sigprocmask");
736
884
_exit(EXIT_FAILURE);
737
885
}
738
886
739
887
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
740
888
if(ret == -1){
741
889
perror("dup2");
760
908
}
761
909
/* no return */
762
910
}
763
/* parent process */
911
/* Parent process */
912
close(pipefd[1]); /* Close unused write end of pipe */
764
913
free(filename);
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);
914
plugin *new_plugin = getplugin(dirst->d_name);
915
if(new_plugin == NULL){
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
770
918
if(ret < 0){
771
perror("sigprocmask");
919
perror("sigprocmask");
772
920
}
773
921
exitstatus = EXIT_FAILURE;
774
922
goto fallback;
775
923
}
776
924
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
925
new_plugin->pid = pid;
926
new_plugin->fd = pipefd[0];
927
782
928
/* Unblock SIGCHLD so signal handler can be run if this process
783
929
has already completed */
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
785
931
if(ret < 0){
786
932
perror("sigprocmask");
787
933
exitstatus = EXIT_FAILURE;
788
934
goto fallback;
789
935
}
790
936
791
FD_SET(new_process->fd, &rfds_all);
937
FD_SET(new_plugin->fd, &rfds_all);
792
938
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
939
if(maxfd < new_plugin->fd){
940
maxfd = new_plugin->fd;
795
941
}
796
797
942
}
798
943
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
944
closedir(dir);
803
945
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
946
free_plugin(getplugin(NULL));
947
948
for(plugin *p = plugin_list; p != NULL; p = p->next){
949
if(p->pid != 0){
950
break;
951
}
952
if(p->next == NULL){
953
fprintf(stderr, "No plugin processes started. Incorrect plugin"
954
" directory?\n");
955
free_plugin_list();
956
}
809
957
}
810
while(process_list){
958
959
/* Main loop while running plugins exist */
960
while(plugin_list){
811
961
fd_set rfds = rfds_all;
812
962
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
if (select_ret == -1){
963
if(select_ret == -1){
814
964
perror("select");
815
965
exitstatus = EXIT_FAILURE;
816
966
goto fallback;
817
967
}
818
968
/* OK, now either a process completed, or something can be read
819
969
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
970
for(plugin *proc = plugin_list; proc != NULL;){
821
971
/* Is this process completely done? */
822
if(proc->eof and proc->completed){
972
if(proc->completed and proc->eof){
823
973
/* Only accept the plugin output if it exited cleanly */
824
974
if(not WIFEXITED(proc->status)
825
975
or WEXITSTATUS(proc->status) != 0){
826
976
/* Bad exit by plugin */
977
827
978
if(debug){
828
979
if(WIFEXITED(proc->status)){
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
981
" status %d\n", proc->name,
982
(intmax_t) (proc->pid),
831
983
WEXITSTATUS(proc->status));
832
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
835
WTERMSIG(proc->status));
984
} else if(WIFSIGNALED(proc->status)){
985
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
986
" signal %d: %s\n", proc->name,
987
(intmax_t) (proc->pid),
988
WTERMSIG(proc->status),
989
strsignal(WTERMSIG(proc->status)));
836
990
} else if(WCOREDUMP(proc->status)){
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
991
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
992
" core\n", proc->name, (intmax_t) (proc->pid));
839
993
}
840
994
}
995
841
996
/* Remove the plugin */
842
997
FD_CLR(proc->fd, &rfds_all);
998
843
999
/* Block signal while modifying process_list */
844
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
1001
if(ret < 0){
847
1003
exitstatus = EXIT_FAILURE;
848
1004
goto fallback;
849
1005
}
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
}
1006
1007
plugin *next_plugin = proc->next;
1008
free_plugin(proc);
1009
proc = next_plugin;
1010
863
1011
/* We are done modifying process list, so unblock signal */
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
866
1014
if(ret < 0){
867
1015
perror("sigprocmask");
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;
1016
exitstatus = EXIT_FAILURE;
1017
goto fallback;
1018
}
1019
1020
if(plugin_list == NULL){
1021
break;
1022
}
1023
1024
continue;
875
1025
}
1026
876
1027
/* This process exited nicely, so print its buffer */
877
1028
878
1029
bool bret = print_out_password(proc->buffer,
879
1030
proc->buffer_length);
880
1031
if(not bret){
883
1034
}
884
1035
goto fallback;
885
1036
}
1037
886
1038
/* This process has not completed. Does it have any output? */
887
1039
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
888
1040
/* This process had nothing to say at this time */
1041
proc = proc->next;
889
1042
continue;
890
1043
}
891
1044
/* Before reading, make the process' data buffer large enough */
892
1045
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
893
1046
proc->buffer = realloc(proc->buffer, proc->buffer_size
894
1047
+ (size_t) BUFFER_SIZE);
895
if (proc->buffer == NULL){
1048
if(proc->buffer == NULL){
896
1049
perror("malloc");
897
1050
exitstatus = EXIT_FAILURE;
898
1051
goto fallback;
900
1053
proc->buffer_size += BUFFER_SIZE;
901
1054
}
902
1055
/* Read from the process */
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1058
if(sret < 0){
906
1059
/* Read error from this process; ignore the error */
1060
proc = proc->next;
907
1061
continue;
908
1062
}
909
if(ret == 0){
1063
if(sret == 0){
910
1064
/* got EOF */
911
1065
proc->eof = true;
912
1066
} else {
913
proc->buffer_length += (size_t) ret;
1067
proc->buffer_length += (size_t) sret;
914
1068
}
915
1069
}
916
1070
}
917
918
1071
1072
919
1073
fallback:
920
1074
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
922
1076
/* Fallback if all plugins failed, none are found or an error
923
1077
occured */
924
1078
bool bret;
925
1079
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1080
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1081
size_t len = strlen(passwordbuffer);
1082
/* Strip trailing newline */
1083
if(len > 0 and passwordbuffer[len-1] == '\n'){
1084
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1085
len--;
1086
}
1087
bret = print_out_password(passwordbuffer, len);
928
1088
if(not bret){
929
1089
perror("print_out_password");
930
1090
exitstatus = EXIT_FAILURE;
937
1097
perror("sigaction");
938
1098
exitstatus = EXIT_FAILURE;
939
1099
}
940
1100
941
1101
if(custom_argv != NULL){
942
1102
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1103
free(*arg);
944
1104
}
945
1105
free(custom_argv);
946
1106
}
947
free_plugin_list(plugin_list);
948
1107
949
1108
if(dir != NULL){
950
1109
closedir(dir);
951
1110
}
952
1111
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");
1112
/* Kill the processes */
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
if(p->pid != 0){
1115
close(p->fd);
1116
ret = kill(p->pid, SIGTERM);
1117
if(ret == -1 and errno != ESRCH){
1118
/* Set-uid proccesses might not get closed */
1119
perror("kill");
1120
}
961
1121
}
962
free(process_list->buffer);
963
free(process_list);
964
1122
}
965
1123
966
1124
/* Wait for any remaining child processes to terminate */
971
1129
perror("wait");
972
1130
}
973
1131
1132
free_plugin_list();
1133
1134
free(plugindir);
1135
free(argfile);
1136
974
1137
return exitstatus;
975
1138
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0