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- Committer: Mooie
- Date: 2009-01-10 00:53:09 UTC
- mto: This revision was merged to the branch mainline in revision 258.
- Revision ID: mooie@thinkmoo-20090110005309-1f1uhhvrif4tg6ev
Updated Makefile to use -fPIC.
Updated Makefile to use -pie and -fPIE correctly.
Updated Makefile to use -pie and -fPIE correctly.
- 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,
64
66
#include <errno.h> /* errno, EBADF */
65
67
66
68
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
69
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
70
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
75
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
76
typedef struct plugin{
87
77
char *name; /* can be NULL or any plugin name */
88
78
char **argv;
90
80
char **environ;
91
81
int envc;
92
82
bool disabled;
83
84
/* Variables used for running processes*/
85
pid_t pid;
86
int fd;
87
char *buffer;
88
size_t buffer_size;
89
size_t buffer_length;
90
bool eof;
91
volatile bool completed;
92
volatile int status;
93
93
struct plugin *next;
94
94
} plugin;
95
95
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
98
103
if ((p->name == name)
99
104
or (p->name and name and (strcmp(p->name, name) == 0))){
100
105
return p;
105
110
if (new_plugin == NULL){
106
111
return NULL;
107
112
}
108
*new_plugin = (plugin) { .name = name,
113
char *copy_name = NULL;
114
if(name != NULL){
115
copy_name = strdup(name);
116
if(copy_name == NULL){
117
return NULL;
118
}
119
}
120
121
*new_plugin = (plugin) { .name = copy_name,
109
122
.argc = 1,
110
.envc = 0,
111
123
.disabled = false,
112
.next = *plugin_list };
124
.next = plugin_list };
113
125
114
126
new_plugin->argv = malloc(sizeof(char *) * 2);
115
127
if (new_plugin->argv == NULL){
128
free(copy_name);
116
129
free(new_plugin);
117
130
return NULL;
118
131
}
119
new_plugin->argv[0] = name;
132
new_plugin->argv[0] = copy_name;
120
133
new_plugin->argv[1] = NULL;
121
134
122
135
new_plugin->environ = malloc(sizeof(char *));
123
136
if(new_plugin->environ == NULL){
137
free(copy_name);
124
138
free(new_plugin->argv);
125
139
free(new_plugin);
126
140
return NULL;
127
141
}
128
142
new_plugin->environ[0] = NULL;
143
129
144
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
131
146
return new_plugin;
132
147
}
133
148
163
178
}
164
179
165
180
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
167
182
if(p == NULL){
168
183
return false;
169
184
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
170
202
return add_to_char_array(def, &(p->environ), &(p->envc));
171
203
}
172
204
173
174
205
/*
175
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
207
* Descriptor Flags".
177
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
178
209
*/
179
static int set_cloexec_flag(int fd)
180
{
210
static int set_cloexec_flag(int fd){
181
211
int ret = fcntl(fd, F_GETFD, 0);
182
212
/* If reading the flags failed, return error indication now. */
183
213
if(ret < 0){
187
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
188
218
}
189
219
190
process *process_list = NULL;
191
220
192
/* Mark a process as completed when it exits, and save its exit
221
/* Mark processes as completed when they exit, and save their exit
193
222
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;
223
static void handle_sigchld(__attribute__((unused)) int sig){
224
while(true){
225
plugin *proc = plugin_list;
226
int status;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
228
if(pid == 0){
229
/* Only still running child processes */
230
break;
231
}
232
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
235
}
236
/* No child processes */
237
break;
238
}
239
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
242
proc = proc->next;
243
}
244
if(proc == NULL){
245
/* Process not found in process list */
246
continue;
247
}
248
proc->status = status;
249
proc->completed = true;
250
}
211
251
}
212
252
213
bool print_out_password(const char *buffer, size_t length){
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
214
255
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
256
for(size_t written = 0; written < length; written += (size_t)ret){
219
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
258
length - written));
225
263
return true;
226
264
}
227
265
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;
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
234
290
}
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;
291
}
292
293
free(plugin_node);
294
}
295
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
299
}
247
300
}
248
301
249
302
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
303
char *plugindir = NULL;
304
char *argfile = NULL;
252
305
FILE *conffp;
253
306
size_t d_name_len;
254
307
DIR *dir = NULL;
256
309
struct stat st;
257
310
fd_set rfds_all;
258
311
int ret, maxfd = 0;
312
ssize_t sret;
259
313
uid_t uid = 65534;
260
314
gid_t gid = 65534;
261
315
bool debug = false;
269
323
/* Establish a signal handler */
270
324
sigemptyset(&sigchld_action.sa_mask);
271
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
326
if(ret == -1){
273
327
perror("sigaddset");
274
exit(EXIT_FAILURE);
328
exitstatus = EXIT_FAILURE;
329
goto fallback;
275
330
}
276
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
332
if(ret == -1){
278
333
perror("sigaction");
279
exit(EXIT_FAILURE);
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
280
336
}
281
337
282
338
/* The options we understand. */
284
340
{ .name = "global-options", .key = 'g',
285
341
.arg = "OPTION[,OPTION[,...]]",
286
342
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
343
{ .name = "global-env", .key = 'G',
288
344
.arg = "VAR=value",
289
345
.doc = "Environment variable passed to all plugins" },
290
346
{ .name = "options-for", .key = 'o',
291
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
348
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
349
{ .name = "env-for", .key = 'E',
294
350
.arg = "PLUGIN:ENV=value",
295
351
.doc = "Environment variable passed to specified plugin" },
296
352
{ .name = "disable", .key = 'd',
297
353
.arg = "PLUGIN",
298
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
299
358
{ .name = "plugin-dir", .key = 128,
300
359
.arg = "DIRECTORY",
301
360
.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 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
310
372
{ .name = NULL }
311
373
};
312
374
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;
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
317
377
switch (key) {
318
case 'g':
378
case 'g': /* --global-options */
319
379
if (arg != NULL){
320
380
char *p;
321
381
while((p = strsep(&arg, ",")) != NULL){
322
382
if(p[0] == '\0'){
323
383
continue;
324
384
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
385
if(not add_argument(getplugin(NULL), p)){
326
386
perror("add_argument");
327
387
return ARGP_ERR_UNKNOWN;
328
388
}
329
389
}
330
390
}
331
391
break;
332
case 'e':
392
case 'G': /* --global-env */
333
393
if(arg == NULL){
334
394
break;
335
395
}
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
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
344
398
}
345
399
break;
346
case 'o':
400
case 'o': /* --options-for */
347
401
if (arg != NULL){
348
402
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
403
if(p_name[0] == '\0' or arg == NULL){
350
404
break;
351
405
}
352
406
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
407
if(opt[0] == '\0' or opt == NULL){
354
408
break;
355
409
}
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
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
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':
437
case 'd': /* --disable */
390
438
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
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:
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 */
402
466
uid = (uid_t)strtol(arg, NULL, 10);
403
467
break;
404
case 130:
468
case 131: /* --groupid */
405
469
gid = (gid_t)strtol(arg, NULL, 10);
406
470
break;
407
case 131:
471
case 132: /* --debug */
408
472
debug = true;
409
473
break;
410
474
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]",
475
/* Cryptsetup always passes an argument, which is an empty
476
string if "none" was specified in /etc/crypttab. So if
477
argument was empty, we ignore it silently. */
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
484
default:
485
return ARGP_ERR_UNKNOWN;
486
}
487
return 0;
488
}
489
490
/* This option parser is the same as parse_opt() above, except it
491
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
496
case 'g': /* --global-options */
497
case 'G': /* --global-env */
498
case 'o': /* --options-for */
499
case 'E': /* --env-for */
500
case 'd': /* --disable */
501
case 'e': /* --enable */
502
case 128: /* --plugin-dir */
503
break;
504
case 129: /* --config-file */
505
free(argfile);
506
argfile = strdup(arg);
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
511
case 130: /* --userid */
512
case 131: /* --groupid */
513
case 132: /* --debug */
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
516
break;
517
default:
518
return ARGP_ERR_UNKNOWN;
519
}
520
return 0;
521
}
522
523
struct argp argp = { .options = options,
524
.parser = parse_opt_config_file,
525
.args_doc = "",
425
526
.doc = "Mandos plugin runner -- Run plugins" };
426
527
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
528
/* Parse using the parse_opt_config_file in order to get the custom
529
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
428
531
if (ret == ARGP_ERR_UNKNOWN){
429
532
fprintf(stderr, "Unknown error while parsing arguments\n");
430
533
exitstatus = EXIT_FAILURE;
431
goto end;
534
goto fallback;
432
535
}
433
434
conffp = fopen(argfile, "r");
536
537
/* Reset to the normal argument parser */
538
argp.parser = parse_opt;
539
540
/* Open the configfile if available */
541
if (argfile == NULL){
542
conffp = fopen(AFILE, "r");
543
} else {
544
conffp = fopen(argfile, "r");
545
}
435
546
if(conffp != NULL){
436
547
char *org_line = NULL;
548
char *p, *arg, *new_arg, *line;
437
549
size_t size = 0;
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
550
const char whitespace_delims[] = " \r\t\f\v\n";
441
551
const char comment_delim[] = "#";
442
552
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
443
565
while(true){
444
566
sret = getline(&org_line, &size, conffp);
445
567
if(sret == -1){
453
575
continue;
454
576
}
455
577
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
}
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
462
596
}
463
597
}
464
598
free(org_line);
465
} else{
599
} else {
466
600
/* Check for harmful errors and go to fallback. Other errors might
467
601
not affect opening plugins */
468
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
603
perror("fopen");
470
604
exitstatus = EXIT_FAILURE;
471
goto end;
605
goto fallback;
472
606
}
473
607
}
474
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
475
610
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
478
613
if (ret == ARGP_ERR_UNKNOWN){
479
614
fprintf(stderr, "Unknown error while parsing arguments\n");
480
615
exitstatus = EXIT_FAILURE;
481
goto end;
616
goto fallback;
482
617
}
483
618
}
484
619
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
485
629
if(debug){
486
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
496
640
}
497
641
}
498
642
643
/* Strip permissions down to nobody */
499
644
ret = setuid(uid);
500
645
if (ret == -1){
501
646
perror("setuid");
502
}
503
647
}
504
648
setgid(gid);
505
649
if (ret == -1){
506
650
perror("setgid");
507
651
}
508
652
509
dir = opendir(plugindir);
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
510
659
if(dir == NULL){
511
660
perror("Could not open plugin dir");
512
661
exitstatus = EXIT_FAILURE;
513
goto end;
662
goto fallback;
514
663
}
515
664
516
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
521
670
if(ret < 0){
522
671
perror("set_cloexec_flag");
523
672
exitstatus = EXIT_FAILURE;
524
goto end;
673
goto fallback;
525
674
}
526
675
}
527
676
}
528
677
529
678
FD_ZERO(&rfds_all);
530
679
680
/* Read and execute any executable in the plugin directory*/
531
681
while(true){
532
682
dirst = readdir(dir);
533
683
534
// All directory entries have been processed
684
/* All directory entries have been processed */
535
685
if(dirst == NULL){
536
686
if (errno == EBADF){
537
687
perror("readdir");
538
688
exitstatus = EXIT_FAILURE;
539
goto end;
689
goto fallback;
540
690
}
541
691
break;
542
692
}
543
693
544
694
d_name_len = strlen(dirst->d_name);
545
695
546
// Ignore dotfiles, backup files and other junk
696
/* Ignore dotfiles, backup files and other junk */
547
697
{
548
698
bool bad_name = false;
549
699
551
701
552
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
553
703
".dpkg-old",
704
".dpkg-bak",
554
705
".dpkg-divert", NULL };
555
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
556
707
size_t pre_len = strlen(*pre);
564
715
break;
565
716
}
566
717
}
567
568
718
if(bad_name){
569
719
continue;
570
720
}
571
572
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
722
size_t suf_len = strlen(*suf);
574
723
if((d_name_len >= suf_len)
589
738
}
590
739
591
740
char *filename;
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
593
746
if(ret < 0){
594
747
perror("asprintf");
595
748
continue;
601
754
free(filename);
602
755
continue;
603
756
}
604
757
758
/* Ignore non-executable files */
605
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
606
760
if(debug){
607
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
610
764
free(filename);
611
765
continue;
612
766
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
768
plugin *p = getplugin(dirst->d_name);
614
769
if(p == NULL){
615
770
perror("getplugin");
616
771
free(filename);
626
781
}
627
782
{
628
783
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
784
plugin *g = getplugin(NULL);
630
785
if(g != NULL){
631
786
for(char **a = g->argv + 1; *a != NULL; a++){
632
787
if(not add_argument(p, *a)){
635
790
}
636
791
/* Add global environment variables */
637
792
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
793
if(not add_environment(p, *e, false)){
639
794
perror("add_environment");
640
795
}
641
796
}
646
801
process, too. */
647
802
if(p->environ[0] != NULL){
648
803
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)){
804
if(not add_environment(p, *e, false)){
655
805
perror("add_environment");
656
806
}
657
807
}
658
808
}
659
809
660
int pipefd[2];
810
int pipefd[2];
661
811
ret = pipe(pipefd);
662
812
if (ret == -1){
663
813
perror("pipe");
664
814
exitstatus = EXIT_FAILURE;
665
goto end;
815
goto fallback;
666
816
}
817
/* Ask OS to automatic close the pipe on exec */
667
818
ret = set_cloexec_flag(pipefd[0]);
668
819
if(ret < 0){
669
820
perror("set_cloexec_flag");
670
821
exitstatus = EXIT_FAILURE;
671
goto end;
822
goto fallback;
672
823
}
673
824
ret = set_cloexec_flag(pipefd[1]);
674
825
if(ret < 0){
675
826
perror("set_cloexec_flag");
676
827
exitstatus = EXIT_FAILURE;
677
goto end;
828
goto fallback;
678
829
}
679
830
/* Block SIGCHLD until process is safely in process list */
680
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
681
832
if(ret < 0){
682
833
perror("sigprocmask");
683
834
exitstatus = EXIT_FAILURE;
684
goto end;
835
goto fallback;
685
836
}
686
// Starting a new process to be watched
837
/* Starting a new process to be watched */
687
838
pid_t pid = fork();
688
839
if(pid == -1){
689
840
perror("fork");
690
841
exitstatus = EXIT_FAILURE;
691
goto end;
842
goto fallback;
692
843
}
693
844
if(pid == 0){
694
845
/* this is the child process */
697
848
perror("sigaction");
698
849
_exit(EXIT_FAILURE);
699
850
}
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
701
852
if(ret < 0){
702
853
perror("sigprocmask");
703
854
_exit(EXIT_FAILURE);
704
855
}
705
856
706
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
707
858
if(ret == -1){
708
859
perror("dup2");
727
878
}
728
879
/* no return */
729
880
}
730
/* parent process */
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
731
883
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");
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
736
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
737
888
if(ret < 0){
738
perror("sigprocmask");
889
perror("sigprocmask");
739
890
}
740
891
exitstatus = EXIT_FAILURE;
741
goto end;
892
goto fallback;
742
893
}
743
894
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
749
898
/* Unblock SIGCHLD so signal handler can be run if this process
750
899
has already completed */
751
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
752
901
if(ret < 0){
753
902
perror("sigprocmask");
754
903
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);
904
goto fallback;
905
}
906
907
FD_SET(new_plugin->fd, &rfds_all);
908
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
911
}
776
912
}
777
913
778
914
closedir(dir);
779
915
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
916
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
if(p->pid != 0){
919
break;
920
}
921
if(p->next == NULL){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
923
" directory?\n");
924
free_plugin_list();
925
}
785
926
}
786
while(process_list){
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
787
930
fd_set rfds = rfds_all;
788
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
932
if (select_ret == -1){
790
933
perror("select");
791
934
exitstatus = EXIT_FAILURE;
792
goto end;
935
goto fallback;
793
936
}
794
937
/* OK, now either a process completed, or something can be read
795
938
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
939
for(plugin *proc = plugin_list; proc != NULL;){
797
940
/* Is this process completely done? */
798
941
if(proc->eof and proc->completed){
799
942
/* Only accept the plugin output if it exited cleanly */
800
943
if(not WIFEXITED(proc->status)
801
944
or WEXITSTATUS(proc->status) != 0){
802
945
/* Bad exit by plugin */
946
803
947
if(debug){
804
948
if(WIFEXITED(proc->status)){
805
949
fprintf(stderr, "Plugin %u exited with status %d\n",
814
958
(unsigned int) (proc->pid));
815
959
}
816
960
}
961
817
962
/* Remove the plugin */
818
963
FD_CLR(proc->fd, &rfds_all);
964
819
965
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
821
967
if(ret < 0){
822
968
perror("sigprocmask");
823
969
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
}
970
goto fallback;
971
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
839
977
/* We are done modifying process list, so unblock signal */
840
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
979
NULL);
842
980
if(ret < 0){
843
981
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;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
851
991
}
992
852
993
/* This process exited nicely, so print its buffer */
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
855
997
if(not bret){
856
998
perror("print_out_password");
857
999
exitstatus = EXIT_FAILURE;
858
1000
}
859
goto end;
1001
goto fallback;
860
1002
}
1003
861
1004
/* This process has not completed. Does it have any output? */
862
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
1006
/* This process had nothing to say at this time */
1007
proc = proc->next;
864
1008
continue;
865
1009
}
866
1010
/* Before reading, make the process' data buffer large enough */
870
1014
if (proc->buffer == NULL){
871
1015
perror("malloc");
872
1016
exitstatus = EXIT_FAILURE;
873
goto end;
1017
goto fallback;
874
1018
}
875
1019
proc->buffer_size += BUFFER_SIZE;
876
1020
}
877
1021
/* Read from the process */
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(sret < 0){
881
1025
/* Read error from this process; ignore the error */
1026
proc = proc->next;
882
1027
continue;
883
1028
}
884
if(ret == 0){
1029
if(sret == 0){
885
1030
/* got EOF */
886
1031
proc->eof = true;
887
1032
} else {
888
proc->buffer_length += (size_t) ret;
1033
proc->buffer_length += (size_t) sret;
889
1034
}
890
1035
}
891
1036
}
892
1037
893
1038
894
end:
1039
fallback:
895
1040
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
898
1044
bool bret;
899
1045
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1046
char *passwordbuffer = getpass("Password: ");
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
len--;
1052
}
1053
bret = print_out_password(passwordbuffer, len);
902
1054
if(not bret){
903
1055
perror("print_out_password");
904
1056
exitstatus = EXIT_FAILURE;
905
goto end;
906
1057
}
907
1058
}
908
1059
909
1060
/* 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
}
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
if(ret == -1){
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1065
}
1066
1067
if(custom_argv != NULL){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1069
free(*arg);
922
1070
}
923
free(plugin_list->environ);
924
free(plugin_list);
1071
free(custom_argv);
925
1072
}
926
1073
927
1074
if(dir != NULL){
928
1075
closedir(dir);
929
1076
}
930
1077
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");
1078
/* Kill the processes */
1079
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
if(p->pid != 0){
1081
close(p->fd);
1082
ret = kill(p->pid, SIGTERM);
1083
if(ret == -1 and errno != ESRCH){
1084
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1086
}
939
1087
}
940
free(process_list->buffer);
941
free(process_list);
942
1088
}
943
1089
944
1090
/* Wait for any remaining child processes to terminate */
949
1095
perror("wait");
950
1096
}
951
1097
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
952
1103
return exitstatus;
953
1104
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0