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- Committer: Teddy Hogeborn
- Date: 2009-02-23 11:52:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20090223115242-5930ewin7m4o6zpr
* README (The Plugin System): Improve wording.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- 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,
63
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
65
69
66
70
#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";
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
70
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
77
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
78
typedef struct plugin{
87
79
char *name; /* can be NULL or any plugin name */
88
80
char **argv;
90
82
char **environ;
91
83
int envc;
92
84
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
93
95
struct plugin *next;
94
96
} plugin;
95
97
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))){
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
100
107
return p;
101
108
}
102
109
}
103
110
/* Create a new plugin */
104
111
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
112
if(new_plugin == NULL){
106
113
return NULL;
107
114
}
108
*new_plugin = (plugin) { .name = name,
109
.argc = 1,
110
.envc = 0,
111
.disabled = false,
112
.next = *plugin_list };
115
char *copy_name = NULL;
116
if(name != NULL){
117
copy_name = strdup(name);
118
if(copy_name == NULL){
119
free(new_plugin);
120
return NULL;
121
}
122
}
123
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
113
128
114
129
new_plugin->argv = malloc(sizeof(char *) * 2);
115
if (new_plugin->argv == NULL){
130
if(new_plugin->argv == NULL){
131
free(copy_name);
116
132
free(new_plugin);
117
133
return NULL;
118
134
}
119
new_plugin->argv[0] = name;
135
new_plugin->argv[0] = copy_name;
120
136
new_plugin->argv[1] = NULL;
121
137
122
138
new_plugin->environ = malloc(sizeof(char *));
123
139
if(new_plugin->environ == NULL){
140
free(copy_name);
124
141
free(new_plugin->argv);
125
142
free(new_plugin);
126
143
return NULL;
127
144
}
128
145
new_plugin->environ[0] = NULL;
146
129
147
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
148
plugin_list = new_plugin;
131
149
return new_plugin;
132
150
}
133
151
163
181
}
164
182
165
183
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
184
static bool add_environment(plugin *p, const char *def, bool replace){
167
185
if(p == NULL){
168
186
return false;
169
187
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
170
205
return add_to_char_array(def, &(p->environ), &(p->envc));
171
206
}
172
207
173
174
208
/*
175
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
210
* Descriptor Flags".
177
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
178
212
*/
179
static int set_cloexec_flag(int fd)
180
{
213
static int set_cloexec_flag(int fd){
181
214
int ret = fcntl(fd, F_GETFD, 0);
182
215
/* If reading the flags failed, return error indication now. */
183
216
if(ret < 0){
187
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
188
221
}
189
222
190
process *process_list = NULL;
191
223
192
/* Mark a process as completed when it exits, and save its exit
224
/* Mark processes as completed when they exit, and save their exit
193
225
status. */
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
228
while(true){
229
plugin *proc = plugin_list;
230
int status;
231
pid_t pid = waitpid(-1, &status, WNOHANG);
232
if(pid == 0){
233
/* Only still running child processes */
234
break;
235
}
236
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
240
}
241
perror("waitpid");
242
}
243
244
/* A child exited, find it in process_list */
245
while(proc != NULL and proc->pid != pid){
246
proc = proc->next;
247
}
248
if(proc == NULL){
249
/* Process not found in process list */
250
continue;
251
}
252
proc->status = status;
253
proc->completed = 1;
254
}
255
errno = old_errno;
211
256
}
212
257
213
bool print_out_password(const char *buffer, size_t length){
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
214
260
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
261
for(size_t written = 0; written < length; written += (size_t)ret){
219
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
263
length - written));
225
268
return true;
226
269
}
227
270
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
234
295
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
247
305
}
248
306
249
307
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
252
310
FILE *conffp;
253
311
size_t d_name_len;
254
312
DIR *dir = NULL;
256
314
struct stat st;
257
315
fd_set rfds_all;
258
316
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
259
319
uid_t uid = 65534;
260
320
gid_t gid = 65534;
261
321
bool debug = false;
269
329
/* Establish a signal handler */
270
330
sigemptyset(&sigchld_action.sa_mask);
271
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
332
if(ret == -1){
273
333
perror("sigaddset");
274
exit(EXIT_FAILURE);
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
275
336
}
276
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
338
if(ret == -1){
278
339
perror("sigaction");
279
exit(EXIT_FAILURE);
340
exitstatus = EXIT_FAILURE;
341
goto fallback;
280
342
}
281
343
282
344
/* The options we understand. */
284
346
{ .name = "global-options", .key = 'g',
285
347
.arg = "OPTION[,OPTION[,...]]",
286
348
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
349
{ .name = "global-env", .key = 'G',
288
350
.arg = "VAR=value",
289
351
.doc = "Environment variable passed to all plugins" },
290
352
{ .name = "options-for", .key = 'o',
291
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
354
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
355
{ .name = "env-for", .key = 'E',
294
356
.arg = "PLUGIN:ENV=value",
295
357
.doc = "Environment variable passed to specified plugin" },
296
358
{ .name = "disable", .key = 'd',
297
359
.arg = "PLUGIN",
298
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
299
364
{ .name = "plugin-dir", .key = 128,
300
365
.arg = "DIRECTORY",
301
366
.doc = "Specify a different plugin directory", .group = 2 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
310
378
{ .name = NULL }
311
379
};
312
380
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
switch (key) {
318
case 'g':
319
if (arg != NULL){
320
char *p;
321
while((p = strsep(&arg, ",")) != NULL){
322
if(p[0] == '\0'){
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
323
390
continue;
324
391
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
392
if(not add_argument(getplugin(NULL), plugin_option)){
326
393
perror("add_argument");
327
394
return ARGP_ERR_UNKNOWN;
328
395
}
329
396
}
330
397
}
331
398
break;
332
case 'e':
399
case 'G': /* --global-env */
333
400
if(arg == NULL){
334
401
break;
335
402
}
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
344
405
}
345
406
break;
346
case 'o':
347
if (arg != NULL){
348
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
350
break;
351
}
352
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
354
break;
355
}
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
366
418
}
367
419
}
368
420
}
369
421
break;
370
case 'f':
422
case 'E': /* --env-for */
371
423
if(arg == NULL){
372
424
break;
373
425
}
376
428
if(envdef == NULL){
377
429
break;
378
430
}
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
383
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
385
433
perror("add_environment");
386
434
}
387
435
}
388
436
break;
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
392
440
if(p == NULL){
393
441
return ARGP_ERR_UNKNOWN;
394
442
}
395
443
p->disabled = true;
396
444
}
397
445
break;
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
402
uid = (uid_t)strtol(arg, NULL, 10);
403
break;
404
case 130:
405
gid = (gid_t)strtol(arg, NULL, 10);
406
break;
407
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
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
408
488
debug = true;
409
489
break;
410
case ARGP_KEY_ARG:
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
425
546
.doc = "Mandos plugin runner -- Run plugins" };
426
547
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
429
552
fprintf(stderr, "Unknown error while parsing arguments\n");
430
553
exitstatus = EXIT_FAILURE;
431
goto end;
554
goto fallback;
432
555
}
433
434
conffp = fopen(argfile, "r");
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
435
566
if(conffp != NULL){
436
567
char *org_line = NULL;
568
char *p, *arg, *new_arg, *line;
437
569
size_t size = 0;
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
570
const char whitespace_delims[] = " \r\t\f\v\n";
441
571
const char comment_delim[] = "#";
442
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
443
585
while(true){
444
586
sret = getline(&org_line, &size, conffp);
445
587
if(sret == -1){
446
588
break;
447
589
}
448
590
449
591
line = org_line;
450
592
arg = strsep(&line, comment_delim);
451
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
453
595
continue;
454
596
}
455
597
new_arg = strdup(p);
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
462
616
}
463
617
}
464
618
free(org_line);
465
} else{
619
} else {
466
620
/* Check for harmful errors and go to fallback. Other errors might
467
621
not affect opening plugins */
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
623
perror("fopen");
470
624
exitstatus = EXIT_FAILURE;
471
goto end;
625
goto fallback;
472
626
}
473
627
}
474
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
475
630
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
if (ret == ARGP_ERR_UNKNOWN){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
479
634
fprintf(stderr, "Unknown error while parsing arguments\n");
480
635
exitstatus = EXIT_FAILURE;
481
goto end;
636
goto fallback;
482
637
}
483
638
}
484
639
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
485
649
if(debug){
486
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
489
653
for(char **a = p->argv; *a != NULL; a++){
490
654
fprintf(stderr, "\tArg: %s\n", *a);
491
655
}
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
493
657
for(char **a = p->environ; *a != NULL; a++){
494
658
fprintf(stderr, "\t%s\n", *a);
495
659
}
496
660
}
497
661
}
498
662
663
/* Strip permissions down to nobody */
664
setgid(gid);
665
if(ret == -1){
666
perror("setgid");
667
}
499
668
ret = setuid(uid);
500
if (ret == -1){
669
if(ret == -1){
501
670
perror("setuid");
502
671
}
503
672
504
setgid(gid);
505
if (ret == -1){
506
perror("setgid");
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
507
677
}
508
678
509
dir = opendir(plugindir);
510
679
if(dir == NULL){
511
680
perror("Could not open plugin dir");
512
681
exitstatus = EXIT_FAILURE;
513
goto end;
682
goto fallback;
514
683
}
515
684
516
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
521
690
if(ret < 0){
522
691
perror("set_cloexec_flag");
523
692
exitstatus = EXIT_FAILURE;
524
goto end;
693
goto fallback;
525
694
}
526
695
}
527
696
}
528
697
529
698
FD_ZERO(&rfds_all);
530
699
700
/* Read and execute any executable in the plugin directory*/
531
701
while(true){
532
702
dirst = readdir(dir);
533
703
534
// All directory entries have been processed
704
/* All directory entries have been processed */
535
705
if(dirst == NULL){
536
if (errno == EBADF){
706
if(errno == EBADF){
537
707
perror("readdir");
538
708
exitstatus = EXIT_FAILURE;
539
goto end;
709
goto fallback;
540
710
}
541
711
break;
542
712
}
543
713
544
714
d_name_len = strlen(dirst->d_name);
545
715
546
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
547
717
{
548
718
bool bad_name = false;
549
719
551
721
552
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
553
723
".dpkg-old",
724
".dpkg-bak",
554
725
".dpkg-divert", NULL };
555
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
556
727
size_t pre_len = strlen(*pre);
564
735
break;
565
736
}
566
737
}
567
568
738
if(bad_name){
569
739
continue;
570
740
}
571
572
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
742
size_t suf_len = strlen(*suf);
574
743
if((d_name_len >= suf_len)
587
756
continue;
588
757
}
589
758
}
590
759
591
760
char *filename;
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
593
766
if(ret < 0){
594
767
perror("asprintf");
595
768
continue;
596
769
}
597
770
598
771
ret = stat(filename, &st);
599
if (ret == -1){
772
if(ret == -1){
600
773
perror("stat");
601
774
free(filename);
602
775
continue;
603
776
}
604
777
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
606
780
if(debug){
607
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
608
782
" with bad type or mode\n", filename);
610
784
free(filename);
611
785
continue;
612
786
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
787
788
plugin *p = getplugin(dirst->d_name);
614
789
if(p == NULL){
615
790
perror("getplugin");
616
791
free(filename);
626
801
}
627
802
{
628
803
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
804
plugin *g = getplugin(NULL);
630
805
if(g != NULL){
631
806
for(char **a = g->argv + 1; *a != NULL; a++){
632
807
if(not add_argument(p, *a)){
635
810
}
636
811
/* Add global environment variables */
637
812
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
813
if(not add_environment(p, *e, false)){
639
814
perror("add_environment");
640
815
}
641
816
}
646
821
process, too. */
647
822
if(p->environ[0] != NULL){
648
823
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
824
if(not add_environment(p, *e, false)){
655
825
perror("add_environment");
656
826
}
657
827
}
658
828
}
659
829
660
int pipefd[2];
830
int pipefd[2];
661
831
ret = pipe(pipefd);
662
if (ret == -1){
832
if(ret == -1){
663
833
perror("pipe");
664
834
exitstatus = EXIT_FAILURE;
665
goto end;
835
goto fallback;
666
836
}
837
/* Ask OS to automatic close the pipe on exec */
667
838
ret = set_cloexec_flag(pipefd[0]);
668
839
if(ret < 0){
669
840
perror("set_cloexec_flag");
670
841
exitstatus = EXIT_FAILURE;
671
goto end;
842
goto fallback;
672
843
}
673
844
ret = set_cloexec_flag(pipefd[1]);
674
845
if(ret < 0){
675
846
perror("set_cloexec_flag");
676
847
exitstatus = EXIT_FAILURE;
677
goto end;
848
goto fallback;
678
849
}
679
850
/* Block SIGCHLD until process is safely in process list */
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
681
852
if(ret < 0){
682
853
perror("sigprocmask");
683
854
exitstatus = EXIT_FAILURE;
684
goto end;
855
goto fallback;
685
856
}
686
// Starting a new process to be watched
857
/* Starting a new process to be watched */
687
858
pid_t pid = fork();
688
859
if(pid == -1){
689
860
perror("fork");
690
861
exitstatus = EXIT_FAILURE;
691
goto end;
862
goto fallback;
692
863
}
693
864
if(pid == 0){
694
865
/* this is the child process */
697
868
perror("sigaction");
698
869
_exit(EXIT_FAILURE);
699
870
}
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
701
872
if(ret < 0){
702
873
perror("sigprocmask");
703
874
_exit(EXIT_FAILURE);
704
875
}
705
876
706
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
707
878
if(ret == -1){
708
879
perror("dup2");
727
898
}
728
899
/* no return */
729
900
}
730
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
731
903
free(filename);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
737
908
if(ret < 0){
738
perror("sigprocmask");
909
perror("sigprocmask");
739
910
}
740
911
exitstatus = EXIT_FAILURE;
741
goto end;
912
goto fallback;
742
913
}
743
914
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
749
918
/* Unblock SIGCHLD so signal handler can be run if this process
750
919
has already completed */
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
752
921
if(ret < 0){
753
922
perror("sigprocmask");
754
923
exitstatus = EXIT_FAILURE;
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
924
goto fallback;
925
}
926
927
FD_SET(new_plugin->fd, &rfds_all);
928
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
931
}
776
932
}
777
933
778
934
closedir(dir);
779
935
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
936
free_plugin(getplugin(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
}
785
947
}
786
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
787
951
fd_set rfds = rfds_all;
788
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
if (select_ret == -1){
953
if(select_ret == -1){
790
954
perror("select");
791
955
exitstatus = EXIT_FAILURE;
792
goto end;
956
goto fallback;
793
957
}
794
958
/* OK, now either a process completed, or something can be read
795
959
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
797
961
/* Is this process completely done? */
798
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
799
963
/* Only accept the plugin output if it exited cleanly */
800
964
if(not WIFEXITED(proc->status)
801
965
or WEXITSTATUS(proc->status) != 0){
802
966
/* Bad exit by plugin */
967
803
968
if(debug){
804
969
if(WIFEXITED(proc->status)){
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
807
973
WEXITSTATUS(proc->status));
808
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
811
978
WTERMSIG(proc->status));
812
979
} else if(WCOREDUMP(proc->status)){
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
815
982
}
816
983
}
984
817
985
/* Remove the plugin */
818
986
FD_CLR(proc->fd, &rfds_all);
987
819
988
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
821
990
if(ret < 0){
822
991
perror("sigprocmask");
823
992
exitstatus = EXIT_FAILURE;
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
993
goto fallback;
994
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
839
1000
/* We are done modifying process list, so unblock signal */
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
842
1003
if(ret < 0){
843
1004
perror("sigprocmask");
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
851
1014
}
1015
852
1016
/* This process exited nicely, so print its buffer */
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
855
1020
if(not bret){
856
1021
perror("print_out_password");
857
1022
exitstatus = EXIT_FAILURE;
858
1023
}
859
goto end;
1024
goto fallback;
860
1025
}
1026
861
1027
/* This process has not completed. Does it have any output? */
862
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
864
1031
continue;
865
1032
}
866
1033
/* Before reading, make the process' data buffer large enough */
867
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
868
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
869
1036
+ (size_t) BUFFER_SIZE);
870
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
871
1038
perror("malloc");
872
1039
exitstatus = EXIT_FAILURE;
873
goto end;
1040
goto fallback;
874
1041
}
875
1042
proc->buffer_size += BUFFER_SIZE;
876
1043
}
877
1044
/* Read from the process */
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
881
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
882
1050
continue;
883
1051
}
884
if(ret == 0){
1052
if(sret == 0){
885
1053
/* got EOF */
886
1054
proc->eof = true;
887
1055
} else {
888
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
889
1057
}
890
1058
}
891
1059
}
892
893
894
end:
895
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1060
1061
1062
fallback:
1063
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1066
occured */
898
1067
bool bret;
899
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1069
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
902
1077
if(not bret){
903
1078
perror("print_out_password");
904
1079
exitstatus = EXIT_FAILURE;
905
goto end;
906
1080
}
907
1081
}
908
1082
909
1083
/* Restore old signal handler */
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1085
if(ret == -1){
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1088
}
1089
1090
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1092
free(*arg);
922
1093
}
923
free(plugin_list->environ);
924
free(plugin_list);
1094
free(custom_argv);
925
1095
}
926
1096
927
1097
if(dir != NULL){
928
1098
closedir(dir);
929
1099
}
930
1100
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
939
1110
}
940
free(process_list->buffer);
941
free(process_list);
942
1111
}
943
1112
944
1113
/* Wait for any remaining child processes to terminate */
949
1118
perror("wait");
950
1119
}
951
1120
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
952
1126
return exitstatus;
953
1127
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0