To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 277
- compare with another revision
- download diff
- download tarball
- view history from revision 277
- Committer: Teddy Hogeborn
- Date: 2009-01-18 06:41:57 UTC
- Revision ID: teddy@fukt.bsnet.se-20090118064157-8o4oia1y0t8di0xj
* debian/mandos-client.lintian-overrides: Remove override for
unbreakable line in
plugin-runner manual page.
* plugin-runner.xml (EXAMPLES): Make long command line more breakable.
unbreakable line in
plugin-runner manual page.
* plugin-runner.xml (EXAMPLES): Make long command line more breakable.
- 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
65
SIG_UNBLOCK, kill() */
64
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
65
68
66
69
#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";
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
70
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
76
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
77
typedef struct plugin{
87
78
char *name; /* can be NULL or any plugin name */
88
79
char **argv;
90
81
char **environ;
91
82
int envc;
92
83
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
93
94
struct plugin *next;
94
95
} plugin;
95
96
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))){
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
100
106
return p;
101
107
}
102
108
}
103
109
/* Create a new plugin */
104
110
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
111
if(new_plugin == NULL){
106
112
return NULL;
107
113
}
108
*new_plugin = (plugin) { .name = name,
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
free(new_plugin);
119
return NULL;
120
}
121
}
122
123
*new_plugin = (plugin) { .name = copy_name,
109
124
.argc = 1,
110
.envc = 0,
111
125
.disabled = false,
112
.next = *plugin_list };
126
.next = plugin_list };
113
127
114
128
new_plugin->argv = malloc(sizeof(char *) * 2);
115
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
130
free(copy_name);
116
131
free(new_plugin);
117
132
return NULL;
118
133
}
119
new_plugin->argv[0] = name;
134
new_plugin->argv[0] = copy_name;
120
135
new_plugin->argv[1] = NULL;
121
136
122
137
new_plugin->environ = malloc(sizeof(char *));
123
138
if(new_plugin->environ == NULL){
139
free(copy_name);
124
140
free(new_plugin->argv);
125
141
free(new_plugin);
126
142
return NULL;
127
143
}
128
144
new_plugin->environ[0] = NULL;
145
129
146
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
131
148
return new_plugin;
132
149
}
133
150
163
180
}
164
181
165
182
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
167
184
if(p == NULL){
168
185
return false;
169
186
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
170
204
return add_to_char_array(def, &(p->environ), &(p->envc));
171
205
}
172
206
173
174
207
/*
175
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
209
* Descriptor Flags".
177
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
178
211
*/
179
static int set_cloexec_flag(int fd)
180
{
212
static int set_cloexec_flag(int fd){
181
213
int ret = fcntl(fd, F_GETFD, 0);
182
214
/* If reading the flags failed, return error indication now. */
183
215
if(ret < 0){
187
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
188
220
}
189
221
190
process *process_list = NULL;
191
222
192
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
193
224
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;
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if(errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
211
253
}
212
254
213
bool print_out_password(const char *buffer, size_t length){
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
214
257
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
258
for(size_t written = 0; written < length; written += (size_t)ret){
219
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
260
length - written));
225
265
return true;
226
266
}
227
267
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;
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
234
292
}
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;
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
247
302
}
248
303
249
304
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
252
307
FILE *conffp;
253
308
size_t d_name_len;
254
309
DIR *dir = NULL;
255
310
struct dirent *dirst;
256
311
struct stat st;
257
312
fd_set rfds_all;
258
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
259
316
uid_t uid = 65534;
260
317
gid_t gid = 65534;
261
318
bool debug = false;
269
326
/* Establish a signal handler */
270
327
sigemptyset(&sigchld_action.sa_mask);
271
328
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
329
if(ret == -1){
273
330
perror("sigaddset");
274
exit(EXIT_FAILURE);
331
exitstatus = EXIT_FAILURE;
332
goto fallback;
275
333
}
276
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
335
if(ret == -1){
278
336
perror("sigaction");
279
exit(EXIT_FAILURE);
337
exitstatus = EXIT_FAILURE;
338
goto fallback;
280
339
}
281
340
282
341
/* The options we understand. */
284
343
{ .name = "global-options", .key = 'g',
285
344
.arg = "OPTION[,OPTION[,...]]",
286
345
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
346
{ .name = "global-env", .key = 'G',
288
347
.arg = "VAR=value",
289
348
.doc = "Environment variable passed to all plugins" },
290
349
{ .name = "options-for", .key = 'o',
291
350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
351
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
352
{ .name = "env-for", .key = 'E',
294
353
.arg = "PLUGIN:ENV=value",
295
354
.doc = "Environment variable passed to specified plugin" },
296
355
{ .name = "disable", .key = 'd',
297
356
.arg = "PLUGIN",
298
357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
299
361
{ .name = "plugin-dir", .key = 128,
300
362
.arg = "DIRECTORY",
301
363
.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 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.doc = "Debug mode", .group = 4 },
310
375
{ .name = NULL }
311
376
};
312
377
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){
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
if(arg != NULL){
320
383
char *p;
321
384
while((p = strsep(&arg, ",")) != NULL){
322
385
if(p[0] == '\0'){
323
386
continue;
324
387
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
388
if(not add_argument(getplugin(NULL), p)){
326
389
perror("add_argument");
327
390
return ARGP_ERR_UNKNOWN;
328
391
}
329
392
}
330
393
}
331
394
break;
332
case 'e':
395
case 'G': /* --global-env */
333
396
if(arg == NULL){
334
397
break;
335
398
}
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
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
344
401
}
345
402
break;
346
case 'o':
347
if (arg != NULL){
403
case 'o': /* --options-for */
404
if(arg != NULL){
348
405
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
406
if(p_name[0] == '\0' or arg == NULL){
350
407
break;
351
408
}
352
409
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
410
if(opt[0] == '\0' or opt == NULL){
354
411
break;
355
412
}
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
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
366
421
}
367
422
}
368
423
}
369
424
break;
370
case 'f':
425
case 'E': /* --env-for */
371
426
if(arg == NULL){
372
427
break;
373
428
}
376
431
if(envdef == NULL){
377
432
break;
378
433
}
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)){
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
385
436
perror("add_environment");
386
437
}
387
438
}
388
439
break;
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
392
443
if(p == NULL){
393
444
return ARGP_ERR_UNKNOWN;
394
445
}
395
446
p->disabled = true;
396
447
}
397
448
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:
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
case 132: /* --debug */
408
489
debug = true;
409
490
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]",
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.args_doc = "",
425
547
.doc = "Mandos plugin runner -- Run plugins" };
426
548
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
429
553
fprintf(stderr, "Unknown error while parsing arguments\n");
430
554
exitstatus = EXIT_FAILURE;
431
goto end;
555
goto fallback;
432
556
}
433
434
conffp = fopen(argfile, "r");
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
563
conffp = fopen(AFILE, "r");
564
} else {
565
conffp = fopen(argfile, "r");
566
}
435
567
if(conffp != NULL){
436
568
char *org_line = NULL;
569
char *p, *arg, *new_arg, *line;
437
570
size_t size = 0;
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
571
const char whitespace_delims[] = " \r\t\f\v\n";
441
572
const char comment_delim[] = "#";
442
573
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
443
586
while(true){
444
587
sret = getline(&org_line, &size, conffp);
445
588
if(sret == -1){
453
596
continue;
454
597
}
455
598
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
}
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
462
617
}
463
618
}
464
619
free(org_line);
465
} else{
620
} else {
466
621
/* Check for harmful errors and go to fallback. Other errors might
467
622
not affect opening plugins */
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
624
perror("fopen");
470
625
exitstatus = EXIT_FAILURE;
471
goto end;
626
goto fallback;
472
627
}
473
628
}
474
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
475
631
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){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
479
635
fprintf(stderr, "Unknown error while parsing arguments\n");
480
636
exitstatus = EXIT_FAILURE;
481
goto end;
637
goto fallback;
482
638
}
483
639
}
484
640
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
485
650
if(debug){
486
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
489
654
for(char **a = p->argv; *a != NULL; a++){
490
655
fprintf(stderr, "\tArg: %s\n", *a);
491
656
}
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
493
658
for(char **a = p->environ; *a != NULL; a++){
494
659
fprintf(stderr, "\t%s\n", *a);
495
660
}
496
661
}
497
662
}
498
663
664
/* Strip permissions down to nobody */
499
665
ret = setuid(uid);
500
if (ret == -1){
666
if(ret == -1){
501
667
perror("setuid");
502
}
503
668
}
504
669
setgid(gid);
505
if (ret == -1){
670
if(ret == -1){
506
671
perror("setgid");
507
672
}
508
673
509
dir = opendir(plugindir);
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
510
680
if(dir == NULL){
511
681
perror("Could not open plugin dir");
512
682
exitstatus = EXIT_FAILURE;
513
goto end;
683
goto fallback;
514
684
}
515
685
516
686
/* Set the FD_CLOEXEC flag on the directory, if possible */
521
691
if(ret < 0){
522
692
perror("set_cloexec_flag");
523
693
exitstatus = EXIT_FAILURE;
524
goto end;
694
goto fallback;
525
695
}
526
696
}
527
697
}
528
698
529
699
FD_ZERO(&rfds_all);
530
700
701
/* Read and execute any executable in the plugin directory*/
531
702
while(true){
532
703
dirst = readdir(dir);
533
704
534
// All directory entries have been processed
705
/* All directory entries have been processed */
535
706
if(dirst == NULL){
536
if (errno == EBADF){
707
if(errno == EBADF){
537
708
perror("readdir");
538
709
exitstatus = EXIT_FAILURE;
539
goto end;
710
goto fallback;
540
711
}
541
712
break;
542
713
}
543
714
544
715
d_name_len = strlen(dirst->d_name);
545
716
546
// Ignore dotfiles, backup files and other junk
717
/* Ignore dotfiles, backup files and other junk */
547
718
{
548
719
bool bad_name = false;
549
720
551
722
552
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
553
724
".dpkg-old",
725
".dpkg-bak",
554
726
".dpkg-divert", NULL };
555
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
556
728
size_t pre_len = strlen(*pre);
564
736
break;
565
737
}
566
738
}
567
568
739
if(bad_name){
569
740
continue;
570
741
}
571
572
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
743
size_t suf_len = strlen(*suf);
574
744
if((d_name_len >= suf_len)
589
759
}
590
760
591
761
char *filename;
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
593
767
if(ret < 0){
594
768
perror("asprintf");
595
769
continue;
596
770
}
597
771
598
772
ret = stat(filename, &st);
599
if (ret == -1){
773
if(ret == -1){
600
774
perror("stat");
601
775
free(filename);
602
776
continue;
603
777
}
604
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
606
781
if(debug){
607
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
608
783
" with bad type or mode\n", filename);
610
785
free(filename);
611
786
continue;
612
787
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
788
789
plugin *p = getplugin(dirst->d_name);
614
790
if(p == NULL){
615
791
perror("getplugin");
616
792
free(filename);
626
802
}
627
803
{
628
804
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
805
plugin *g = getplugin(NULL);
630
806
if(g != NULL){
631
807
for(char **a = g->argv + 1; *a != NULL; a++){
632
808
if(not add_argument(p, *a)){
635
811
}
636
812
/* Add global environment variables */
637
813
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
814
if(not add_environment(p, *e, false)){
639
815
perror("add_environment");
640
816
}
641
817
}
646
822
process, too. */
647
823
if(p->environ[0] != NULL){
648
824
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)){
825
if(not add_environment(p, *e, false)){
655
826
perror("add_environment");
656
827
}
657
828
}
658
829
}
659
830
660
int pipefd[2];
831
int pipefd[2];
661
832
ret = pipe(pipefd);
662
if (ret == -1){
833
if(ret == -1){
663
834
perror("pipe");
664
835
exitstatus = EXIT_FAILURE;
665
goto end;
836
goto fallback;
666
837
}
838
/* Ask OS to automatic close the pipe on exec */
667
839
ret = set_cloexec_flag(pipefd[0]);
668
840
if(ret < 0){
669
841
perror("set_cloexec_flag");
670
842
exitstatus = EXIT_FAILURE;
671
goto end;
843
goto fallback;
672
844
}
673
845
ret = set_cloexec_flag(pipefd[1]);
674
846
if(ret < 0){
675
847
perror("set_cloexec_flag");
676
848
exitstatus = EXIT_FAILURE;
677
goto end;
849
goto fallback;
678
850
}
679
851
/* Block SIGCHLD until process is safely in process list */
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
681
853
if(ret < 0){
682
854
perror("sigprocmask");
683
855
exitstatus = EXIT_FAILURE;
684
goto end;
856
goto fallback;
685
857
}
686
// Starting a new process to be watched
858
/* Starting a new process to be watched */
687
859
pid_t pid = fork();
688
860
if(pid == -1){
689
861
perror("fork");
690
862
exitstatus = EXIT_FAILURE;
691
goto end;
863
goto fallback;
692
864
}
693
865
if(pid == 0){
694
866
/* this is the child process */
697
869
perror("sigaction");
698
870
_exit(EXIT_FAILURE);
699
871
}
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
701
873
if(ret < 0){
702
874
perror("sigprocmask");
703
875
_exit(EXIT_FAILURE);
704
876
}
705
877
706
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
707
879
if(ret == -1){
708
880
perror("dup2");
727
899
}
728
900
/* no return */
729
901
}
730
/* parent process */
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
731
904
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);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
737
909
if(ret < 0){
738
perror("sigprocmask");
910
perror("sigprocmask");
739
911
}
740
912
exitstatus = EXIT_FAILURE;
741
goto end;
913
goto fallback;
742
914
}
743
915
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
749
919
/* Unblock SIGCHLD so signal handler can be run if this process
750
920
has already completed */
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
752
922
if(ret < 0){
753
923
perror("sigprocmask");
754
924
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);
925
goto fallback;
926
}
927
928
FD_SET(new_plugin->fd, &rfds_all);
929
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
932
}
776
933
}
777
934
778
935
closedir(dir);
779
936
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = 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
962
if(proc->eof and proc->completed){
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 %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
807
972
WEXITSTATUS(proc->status));
808
973
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
811
976
WTERMSIG(proc->status));
812
977
} else if(WCOREDUMP(proc->status)){
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
815
980
}
816
981
}
982
817
983
/* Remove the plugin */
818
984
FD_CLR(proc->fd, &rfds_all);
985
819
986
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
821
988
if(ret < 0){
822
989
perror("sigprocmask");
823
990
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
}
991
goto fallback;
992
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
839
998
/* We are done modifying process list, so unblock signal */
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
842
1001
if(ret < 0){
843
1002
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;
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
851
1012
}
1013
852
1014
/* This process exited nicely, so print its buffer */
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
855
1018
if(not bret){
856
1019
perror("print_out_password");
857
1020
exitstatus = EXIT_FAILURE;
858
1021
}
859
goto end;
1022
goto fallback;
860
1023
}
1024
861
1025
/* This process has not completed. Does it have any output? */
862
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
1027
/* This process had nothing to say at this time */
1028
proc = proc->next;
864
1029
continue;
865
1030
}
866
1031
/* Before reading, make the process' data buffer large enough */
867
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
868
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
869
1034
+ (size_t) BUFFER_SIZE);
870
if (proc->buffer == NULL){
1035
if(proc->buffer == NULL){
871
1036
perror("malloc");
872
1037
exitstatus = EXIT_FAILURE;
873
goto end;
1038
goto fallback;
874
1039
}
875
1040
proc->buffer_size += BUFFER_SIZE;
876
1041
}
877
1042
/* Read from the process */
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
881
1046
/* Read error from this process; ignore the error */
1047
proc = proc->next;
882
1048
continue;
883
1049
}
884
if(ret == 0){
1050
if(sret == 0){
885
1051
/* got EOF */
886
1052
proc->eof = true;
887
1053
} else {
888
proc->buffer_length += (size_t) ret;
1054
proc->buffer_length += (size_t) sret;
889
1055
}
890
1056
}
891
1057
}
892
1058
893
1059
894
end:
1060
fallback:
895
1061
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1063
/* Fallback if all plugins failed, none are found or an error
1064
occured */
898
1065
bool bret;
899
1066
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1067
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
902
1075
if(not bret){
903
1076
perror("print_out_password");
904
1077
exitstatus = EXIT_FAILURE;
905
goto end;
906
1078
}
907
1079
}
908
1080
909
1081
/* 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
}
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
if(ret == -1){
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1086
}
1087
1088
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1090
free(*arg);
922
1091
}
923
free(plugin_list->environ);
924
free(plugin_list);
1092
free(custom_argv);
925
1093
}
926
1094
927
1095
if(dir != NULL){
928
1096
closedir(dir);
929
1097
}
930
1098
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");
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
939
1108
}
940
free(process_list->buffer);
941
free(process_list);
942
1109
}
943
1110
944
1111
/* Wait for any remaining child processes to terminate */
949
1116
perror("wait");
950
1117
}
951
1118
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
952
1124
return exitstatus;
953
1125
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0