To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 24.1.122
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.122
- Committer: Björn Påhlsson
- Date: 2009-01-10 21:49:25 UTC
- mfrom: (237.2.25 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 245.
- Revision ID: belorn@braxen-20090110214925-f0y2sjhb0br4nexb
merge
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- 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 and 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
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
#define _FORTIFY_SOURCE 2
26
27
#include <stdio.h> /* popen, fileno */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
30
WIFEXITED, WEXITSTATUS, wait */
31
#include <sys/wait.h> /* wait */
32
#include <dirent.h> /* DIR, opendir */
33
#include <sys/stat.h> /* stat, struct stat */
34
#include <unistd.h> /* stat, struct stat, chdir */
35
#include <stdlib.h> /* EXIT_FAILURE */
36
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
37
FD_ISSET */
38
#include <string.h> /* strlen, strcpy, strcat */
39
#include <stdbool.h> /* true */
40
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
41
#include <errno.h> /* errno */
42
#include <argp.h> /* argp */
43
44
struct process;
45
46
typedef struct process{
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
sigaddset(), sigaction(),
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
66
#include <errno.h> /* errno, EBADF */
67
68
#define BUFFER_SIZE 256
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;
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
78
char **argv;
79
int argc;
80
char **environ;
81
int envc;
82
bool disabled;
83
84
/* Variables used for running processes*/
47
85
pid_t pid;
48
86
int fd;
49
87
char *buffer;
50
88
size_t buffer_size;
51
89
size_t buffer_length;
52
struct process *next;
53
} process;
54
55
typedef struct plugin{
56
char *name; /* can be "global" and any plugin name */
57
char **argv;
58
int argc;
90
bool eof;
91
volatile bool completed;
92
volatile int status;
59
93
struct plugin *next;
60
94
} plugin;
61
95
62
plugin *getplugin(char *name, plugin **plugin_list){
63
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){
64
103
if ((p->name == name)
65
104
or (p->name and name and (strcmp(p->name, name) == 0))){
66
105
return p;
69
108
/* Create a new plugin */
70
109
plugin *new_plugin = malloc(sizeof(plugin));
71
110
if (new_plugin == NULL){
72
perror("malloc");
73
exit(EXIT_FAILURE);
74
}
75
new_plugin->name = name;
111
return NULL;
112
}
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,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
125
76
126
new_plugin->argv = malloc(sizeof(char *) * 2);
77
127
if (new_plugin->argv == NULL){
78
perror("malloc");
79
exit(EXIT_FAILURE);
128
free(copy_name);
129
free(new_plugin);
130
return NULL;
80
131
}
81
new_plugin->argv[0] = name;
132
new_plugin->argv[0] = copy_name;
82
133
new_plugin->argv[1] = NULL;
83
new_plugin->argc = 1;
134
135
new_plugin->environ = malloc(sizeof(char *));
136
if(new_plugin->environ == NULL){
137
free(copy_name);
138
free(new_plugin->argv);
139
free(new_plugin);
140
return NULL;
141
}
142
new_plugin->environ[0] = NULL;
143
84
144
/* Append the new plugin to the list */
85
new_plugin->next = *plugin_list;
86
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
87
146
return new_plugin;
88
147
}
89
148
90
void addarguments(plugin *p, char *arg){
91
p->argv[p->argc] = arg;
92
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
93
if (p->argv == NULL){
94
perror("malloc");
95
exit(EXIT_FAILURE);
96
}
97
p->argc++;
98
p->argv[p->argc] = NULL;
99
}
100
101
#define BUFFER_SIZE 256
102
103
const char *argp_program_version =
104
"plugbasedclient 0.9";
105
const char *argp_program_bug_address =
106
"<mandos@fukt.bsnet.se>";
107
static char doc[] =
108
"Mandos plugin runner -- Run Mandos plugins";
109
/* A description of the arguments we accept. */
110
static char args_doc[] = "";
149
/* Helper function for add_argument and add_environment */
150
static bool add_to_char_array(const char *new, char ***array,
151
int *len){
152
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
155
/* Malloc check */
156
if(*array == NULL){
157
return false;
158
}
159
/* Make a copy of the new string */
160
char *copy = strdup(new);
161
if(copy == NULL){
162
return false;
163
}
164
/* Insert the copy */
165
(*array)[*len] = copy;
166
(*len)++;
167
/* Add a new terminating NULL pointer to the last element */
168
(*array)[*len] = NULL;
169
return true;
170
}
171
172
/* Add to a plugin's argument vector */
173
static bool add_argument(plugin *p, const char *arg){
174
if(p == NULL){
175
return false;
176
}
177
return add_to_char_array(arg, &(p->argv), &(p->argc));
178
}
179
180
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
182
if(p == NULL){
183
return false;
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
}
202
return add_to_char_array(def, &(p->environ), &(p->envc));
203
}
204
205
/*
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
*/
210
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
212
/* If reading the flags failed, return error indication now. */
213
if(ret < 0){
214
return ret;
215
}
216
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
}
219
220
221
/* Mark processes as completed when they exit, and save their exit
222
status. */
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
}
251
}
252
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
255
ssize_t ret;
256
for(size_t written = 0; written < length; written += (size_t)ret){
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
length - written));
259
if(ret < 0){
260
return false;
261
}
262
}
263
return true;
264
}
265
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
}
290
}
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
}
300
}
111
301
112
302
int main(int argc, char *argv[]){
113
char plugindir[] = "plugins.d";
114
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
115
DIR *dir;
303
char *plugindir = NULL;
304
char *argfile = NULL;
305
FILE *conffp;
306
size_t d_name_len;
307
DIR *dir = NULL;
116
308
struct dirent *dirst;
117
309
struct stat st;
118
fd_set rfds_orig;
310
fd_set rfds_all;
119
311
int ret, maxfd = 0;
120
process *process_list = NULL;
312
ssize_t sret;
313
uid_t uid = 65534;
314
gid_t gid = 65534;
315
bool debug = false;
316
int exitstatus = EXIT_SUCCESS;
317
struct sigaction old_sigchld_action;
318
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
319
.sa_flags = SA_NOCLDSTOP };
320
char **custom_argv = NULL;
321
int custom_argc = 0;
322
323
/* Establish a signal handler */
324
sigemptyset(&sigchld_action.sa_mask);
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
if(ret == -1){
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
329
goto fallback;
330
}
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
if(ret == -1){
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
336
}
121
337
122
338
/* The options we understand. */
123
339
struct argp_option options[] = {
124
340
{ .name = "global-options", .key = 'g',
125
.arg = "option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting all plugins" },
341
.arg = "OPTION[,OPTION[,...]]",
342
.doc = "Options passed to all plugins" },
343
{ .name = "global-env", .key = 'G',
344
.arg = "VAR=value",
345
.doc = "Environment variable passed to all plugins" },
127
346
{ .name = "options-for", .key = 'o',
128
.arg = "plugin:option[,option[,...]]", .flags = 0,
129
.doc = "Options effecting only specified plugins" },
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
348
.doc = "Options passed only to specified plugin" },
349
{ .name = "env-for", .key = 'E',
350
.arg = "PLUGIN:ENV=value",
351
.doc = "Environment variable passed to specified plugin" },
352
{ .name = "disable", .key = 'd',
353
.arg = "PLUGIN",
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
358
{ .name = "plugin-dir", .key = 128,
359
.arg = "DIRECTORY",
360
.doc = "Specify a different plugin directory", .group = 2 },
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 },
130
372
{ .name = NULL }
131
373
};
132
374
133
error_t parse_opt (int key, char *arg, struct argp_state *state) {
134
/* Get the INPUT argument from `argp_parse', which we
135
know is a pointer to our arguments structure. */
136
plugin **plugins = state->input;
137
switch (key) {
138
case 'g':
139
if (arg != NULL){
140
char *p = strtok(arg, ",");
141
do{
142
addarguments(getplugin(NULL, plugins), p);
143
p = strtok(NULL, ",");
144
} while (p);
145
}
146
break;
147
case 'o':
148
if (arg != NULL){
149
char *name = strtok(arg, ":");
150
char *p = strtok(NULL, ":");
151
p = strtok(p, ",");
152
do{
153
addarguments(getplugin(name, plugins), p);
154
p = strtok(NULL, ",");
155
} while (p);
156
}
157
break;
158
case ARGP_KEY_ARG:
159
argp_usage (state);
160
break;
161
case ARGP_KEY_END:
162
break;
163
default:
164
return ARGP_ERR_UNKNOWN;
165
}
166
return 0;
167
}
168
169
plugin *plugin_list = NULL;
170
171
struct argp argp = { .options = options, .parser = parse_opt,
172
.args_doc = args_doc, .doc = doc };
173
174
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
175
176
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
177
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
178
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
179
/* fprintf(stderr, "\tArg: %s\n", *a); */
180
/* } */
181
/* } */
182
183
/* return 0; */
184
185
dir = opendir(plugindir);
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
378
case 'g': /* --global-options */
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
break;
392
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
399
break;
400
case 'o': /* --options-for */
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
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;
418
}
419
}
420
}
421
break;
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
{
427
char *envdef = strchr(arg, ':');
428
if(envdef == NULL){
429
break;
430
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
434
}
435
}
436
break;
437
case 'd': /* --disable */
438
if (arg != NULL){
439
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
442
}
443
p->disabled = true;
444
}
445
break;
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
uid = (uid_t)strtol(arg, NULL, 10);
467
break;
468
case 131: /* --groupid */
469
gid = (gid_t)strtol(arg, NULL, 10);
470
break;
471
case 132: /* --debug */
472
debug = true;
473
break;
474
case ARGP_KEY_ARG:
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 = "",
526
.doc = "Mandos plugin runner -- Run plugins" };
527
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);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
534
goto fallback;
535
}
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
}
546
if(conffp != NULL){
547
char *org_line = NULL;
548
char *p, *arg, *new_arg, *line;
549
size_t size = 0;
550
const char whitespace_delims[] = " \r\t\f\v\n";
551
const char comment_delim[] = "#";
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 */
565
while(true){
566
sret = getline(&org_line, &size, conffp);
567
if(sret == -1){
568
break;
569
}
570
571
line = org_line;
572
arg = strsep(&line, comment_delim);
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
574
if(p[0] == '\0'){
575
continue;
576
}
577
new_arg = strdup(p);
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;
596
}
597
}
598
free(org_line);
599
} else {
600
/* Check for harmful errors and go to fallback. Other errors might
601
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
605
goto fallback;
606
}
607
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
610
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
616
goto fallback;
617
}
618
}
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
629
if(debug){
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
632
p->name ? p->name : "Global", p->argc - 1);
633
for(char **a = p->argv; *a != NULL; a++){
634
fprintf(stderr, "\tArg: %s\n", *a);
635
}
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
637
for(char **a = p->environ; *a != NULL; a++){
638
fprintf(stderr, "\t%s\n", *a);
639
}
640
}
641
}
642
643
/* Strip permissions down to nobody */
644
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
186
658
187
659
if(dir == NULL){
188
fprintf(stderr, "Can not open directory\n");
189
return EXIT_FAILURE;
190
}
191
192
FD_ZERO(&rfds_orig);
193
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
666
{
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
674
}
675
}
676
}
677
678
FD_ZERO(&rfds_all);
679
680
/* Read and execute any executable in the plugin directory*/
194
681
while(true){
195
682
dirst = readdir(dir);
196
683
197
// All directory entries have been processed
684
/* All directory entries have been processed */
198
685
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
199
691
break;
200
692
}
201
693
202
694
d_name_len = strlen(dirst->d_name);
203
695
204
// Ignore dotfiles and backup files
205
if (dirst->d_name[0] == '.'
206
or dirst->d_name[d_name_len - 1] == '~'){
207
continue;
208
}
209
210
char *filename = malloc(d_name_len + plugindir_len + 2);
211
strcpy(filename, plugindir);
212
strcat(filename, "/");
213
strcat(filename, dirst->d_name);
214
215
stat(filename, &st);
216
217
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
218
// Starting a new process to be watched
219
process *new_process = malloc(sizeof(process));
220
int pipefd[2];
221
ret = pipe(pipefd);
222
if (ret == -1){
223
perror(argv[0]);
224
goto end;
225
}
226
new_process->pid = fork();
227
if(new_process->pid == 0){
228
/* this is the child process */
696
/* Ignore dotfiles, backup files and other junk */
697
{
698
bool bad_name = false;
699
700
const char const *bad_prefixes[] = { ".", "#", NULL };
701
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-old",
704
".dpkg-bak",
705
".dpkg-divert", NULL };
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
size_t pre_len = strlen(*pre);
708
if((d_name_len >= pre_len)
709
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
if(debug){
711
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
712
" with bad prefix %s\n", dirst->d_name, *pre);
713
}
714
bad_name = true;
715
break;
716
}
717
}
718
if(bad_name){
719
continue;
720
}
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
size_t suf_len = strlen(*suf);
723
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
== 0)){
726
if(debug){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad suffix %s\n", dirst->d_name, *suf);
729
}
730
bad_name = true;
731
break;
732
}
733
}
734
735
if(bad_name){
736
continue;
737
}
738
}
739
740
char *filename;
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
}
746
if(ret < 0){
747
perror("asprintf");
748
continue;
749
}
750
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
758
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
if(debug){
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
763
}
764
free(filename);
765
continue;
766
}
767
768
plugin *p = getplugin(dirst->d_name);
769
if(p == NULL){
770
perror("getplugin");
771
free(filename);
772
continue;
773
}
774
if(p->disabled){
775
if(debug){
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
dirst->d_name);
778
}
779
free(filename);
780
continue;
781
}
782
{
783
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
785
if(g != NULL){
786
for(char **a = g->argv + 1; *a != NULL; a++){
787
if(not add_argument(p, *a)){
788
perror("add_argument");
789
}
790
}
791
/* Add global environment variables */
792
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
794
perror("add_environment");
795
}
796
}
797
}
798
}
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
802
if(p->environ[0] != NULL){
803
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
805
perror("add_environment");
806
}
807
}
808
}
809
810
int pipefd[2];
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
817
/* Ask OS to automatic close the pipe on exec */
818
ret = set_cloexec_flag(pipefd[0]);
819
if(ret < 0){
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
822
goto fallback;
823
}
824
ret = set_cloexec_flag(pipefd[1]);
825
if(ret < 0){
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
828
goto fallback;
829
}
830
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
832
if(ret < 0){
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
835
goto fallback;
836
}
837
/* Starting a new process to be watched */
838
pid_t pid = fork();
839
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
842
goto fallback;
843
}
844
if(pid == 0){
845
/* this is the child process */
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
847
if(ret < 0){
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
850
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
if(ret < 0){
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
855
}
856
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
if(ret == -1){
859
perror("dup2");
860
_exit(EXIT_FAILURE);
861
}
862
863
if(dirfd(dir) < 0){
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
229
866
closedir(dir);
230
close(pipefd[0]); /* close unused read end of pipe */
231
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
232
char *basename;
233
basename = strrchr(filename, '/');
234
if (basename == NULL){
235
basename = filename;
236
} else {
237
basename++;
238
}
239
plugin *p = getplugin(basename, &plugin_list);
240
241
plugin *g = getplugin(NULL, &plugin_list);
242
for(char **a = g->argv + 1; *a != NULL; a++){
243
addarguments(p, *a);
244
}
867
}
868
if(p->environ[0] == NULL){
245
869
if(execv(filename, p->argv) < 0){
246
perror(argv[0]);
247
close(pipefd[1]);
248
exit(EXIT_FAILURE);
249
}
250
/* no return */
251
}
252
close(pipefd[1]); /* close unused write end of pipe */
253
new_process->fd = pipefd[0];
254
new_process->buffer = malloc(BUFFER_SIZE);
255
if (new_process->buffer == NULL){
256
perror(argv[0]);
257
goto end;
258
}
259
new_process->buffer_size = BUFFER_SIZE;
260
new_process->buffer_length = 0;
261
FD_SET(new_process->fd, &rfds_orig);
262
263
if (maxfd < new_process->fd){
264
maxfd = new_process->fd;
265
}
266
267
//List handling
268
new_process->next = process_list;
269
process_list = new_process;
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
878
}
879
/* no return */
880
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
883
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
if(ret < 0){
889
perror("sigprocmask");
890
}
891
exitstatus = EXIT_FAILURE;
892
goto fallback;
893
}
894
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
898
/* Unblock SIGCHLD so signal handler can be run if this process
899
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
if(ret < 0){
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
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;
270
911
}
271
912
}
272
913
273
914
closedir(dir);
274
275
if (process_list != NULL){
276
while(true){
277
fd_set rfds = rfds_orig;
278
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
279
if (select_ret == -1){
280
perror(argv[0]);
281
goto end;
282
}else{
283
for(process *process_itr = process_list; process_itr != NULL;
284
process_itr = process_itr->next){
285
if(FD_ISSET(process_itr->fd, &rfds)){
286
if(process_itr->buffer_length + BUFFER_SIZE
287
> process_itr->buffer_size){
288
process_itr->buffer = realloc(process_itr->buffer,
289
process_itr->buffer_size
290
+ (size_t) BUFFER_SIZE);
291
if (process_itr->buffer == NULL){
292
perror(argv[0]);
293
goto end;
294
}
295
process_itr->buffer_size += BUFFER_SIZE;
296
}
297
ret = read(process_itr->fd, process_itr->buffer
298
+ process_itr->buffer_length, BUFFER_SIZE);
299
if(ret < 0){
300
/* Read error from this process; ignore it */
301
continue;
302
}
303
process_itr->buffer_length += (size_t) ret;
304
if(ret == 0){
305
/* got EOF */
306
/* wait for process exit */
307
int status;
308
waitpid(process_itr->pid, &status, 0);
309
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
310
for(size_t written = 0;
311
written < process_itr->buffer_length;){
312
ret = write(STDOUT_FILENO,
313
process_itr->buffer + written,
314
process_itr->buffer_length - written);
315
if(ret < 0){
316
perror(argv[0]);
317
goto end;
318
}
319
written += (size_t)ret;
320
}
321
goto end;
322
} else {
323
FD_CLR(process_itr->fd, &rfds_orig);
324
}
325
}
326
}
327
}
328
}
329
}
330
}
331
332
end:
333
for(process *process_itr = process_list; process_itr != NULL;
334
process_itr = process_itr->next){
335
close(process_itr->fd);
336
kill(process_itr->pid, SIGTERM);
337
free(process_itr->buffer);
338
}
339
340
while(true){
341
int status;
342
ret = wait(&status);
343
if (ret == -1){
344
if(errno != ECHILD){
345
perror("wait");
346
}
915
dir = NULL;
916
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
if(p->pid != 0){
347
919
break;
348
920
}
349
}
350
return EXIT_SUCCESS;
921
if(p->next == NULL){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
923
" directory?\n");
924
free_plugin_list();
925
}
926
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
930
fd_set rfds = rfds_all;
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
935
goto fallback;
936
}
937
/* OK, now either a process completed, or something can be read
938
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
940
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
942
/* Only accept the plugin output if it exited cleanly */
943
if(not WIFEXITED(proc->status)
944
or WEXITSTATUS(proc->status) != 0){
945
/* Bad exit by plugin */
946
947
if(debug){
948
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
951
WEXITSTATUS(proc->status));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
956
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
959
}
960
}
961
962
/* Remove the plugin */
963
FD_CLR(proc->fd, &rfds_all);
964
965
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
if(ret < 0){
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
970
goto fallback;
971
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
977
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
980
if(ret < 0){
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
991
}
992
993
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
997
if(not bret){
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1000
}
1001
goto fallback;
1002
}
1003
1004
/* This process has not completed. Does it have any output? */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
continue;
1009
}
1010
/* Before reading, make the process' data buffer large enough */
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1017
goto fallback;
1018
}
1019
proc->buffer_size += BUFFER_SIZE;
1020
}
1021
/* Read from the process */
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(sret < 0){
1025
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
continue;
1028
}
1029
if(sret == 0){
1030
/* got EOF */
1031
proc->eof = true;
1032
} else {
1033
proc->buffer_length += (size_t) sret;
1034
}
1035
}
1036
}
1037
1038
1039
fallback:
1040
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
1044
bool bret;
1045
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
char *passwordbuffer = getpass("Password: ");
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);
1054
if(not bret){
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1057
}
1058
}
1059
1060
/* Restore old signal handler */
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);
1070
}
1071
free(custom_argv);
1072
}
1073
1074
if(dir != NULL){
1075
closedir(dir);
1076
}
1077
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
}
1087
}
1088
}
1089
1090
/* Wait for any remaining child processes to terminate */
1091
do{
1092
ret = wait(NULL);
1093
} while(ret >= 0);
1094
if(errno != ECHILD){
1095
perror("wait");
1096
}
1097
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
return exitstatus;
351
1104
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0