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 74
- compare with another revision
- download diff
- download tarball
- view history from revision 74
- Committer: Teddy Hogeborn
- Date: 2008-08-14 02:24:59 UTC
- Revision ID: teddy@fukt.bsnet.se-20080814022459-rq3jt4q409l3qbj3
* Makefile (PREFIX, CONFDIR): New.
* initramfs-tools-hook: Search for Mandos in /usr/local as well as in
/usr. Also copy plugin-runner. Also chmod
the config dir.
(DESTCONFDIR): Removed.
(MANDOSDIR): New.
(PLUGINDIR): Changed to "${MANDOSDIR}/plugins.d".
* initramfs-tools-script: New.
* mandos-client.c: Renamed to "plugin-runner.c". All references
changed.
(plugindir): Changed to "/lib/mandos/plugins.d".
* plugins.d/usplash: New.
* initramfs-tools-hook: Search for Mandos in /usr/local as well as in
/usr. Also copy plugin-runner. Also chmod
the config dir.
(DESTCONFDIR): Removed.
(MANDOSDIR): New.
(PLUGINDIR): Changed to "${MANDOSDIR}/plugins.d".
* initramfs-tools-script: New.
* mandos-client.c: Renamed to "plugin-runner.c". All references
changed.
(plugindir): Changed to "/lib/mandos/plugins.d".
* plugins.d/usplash: New.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
53
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
66
68
67
#define BUFFER_SIZE 256
69
68
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;
69
const char *argp_program_version = "plugin-runner 1.0";
74
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
71
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;
72
struct process;
83
73
84
/* Variables used for running processes*/
74
typedef struct process{
85
75
pid_t pid;
86
76
int fd;
87
77
char *buffer;
88
78
size_t buffer_size;
89
79
size_t buffer_length;
90
80
bool eof;
91
volatile bool completed;
92
volatile int status;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
93
91
struct plugin *next;
94
92
} plugin;
95
93
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){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
96
if ((p->name == name)
104
97
or (p->name and name and (strcmp(p->name, name) == 0))){
105
98
return p;
108
101
/* Create a new plugin */
109
102
plugin *new_plugin = malloc(sizeof(plugin));
110
103
if (new_plugin == NULL){
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
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
126
108
new_plugin->argv = malloc(sizeof(char *) * 2);
127
109
if (new_plugin->argv == NULL){
128
free(copy_name);
129
free(new_plugin);
130
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
131
112
}
132
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
133
114
new_plugin->argv[1] = NULL;
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
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
144
118
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
146
120
return new_plugin;
147
121
}
148
122
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));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
203
132
}
204
133
205
134
/*
207
136
* Descriptor Flags".
208
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
138
*/
210
static int set_cloexec_flag(int fd){
139
static int set_cloexec_flag(int fd)
140
{
211
141
int ret = fcntl(fd, F_GETFD, 0);
212
142
/* If reading the flags failed, return error indication now. */
213
143
if(ret < 0){
217
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
148
}
219
149
150
process *process_list = NULL;
220
151
221
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
222
153
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
}
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
251
171
}
252
172
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
173
bool print_out_password(const char *buffer, size_t length){
255
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
256
178
for(size_t written = 0; written < length; written += (size_t)ret){
257
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
180
length - written));
263
185
return true;
264
186
}
265
187
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
}
301
302
188
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
305
FILE *conffp;
189
const char *plugindir = "/lib/mandos/plugins.d";
306
190
size_t d_name_len;
307
191
DIR *dir = NULL;
308
192
struct dirent *dirst;
309
193
struct stat st;
310
194
fd_set rfds_all;
311
195
int ret, maxfd = 0;
312
ssize_t sret;
313
196
uid_t uid = 65534;
314
197
gid_t gid = 65534;
315
198
bool debug = false;
317
200
struct sigaction old_sigchld_action;
318
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
319
202
.sa_flags = SA_NOCLDSTOP };
320
char **custom_argv = NULL;
321
int custom_argc = 0;
322
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
323
206
/* Establish a signal handler */
324
207
sigemptyset(&sigchld_action.sa_mask);
325
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
if(ret == -1){
209
if(ret < 0){
327
210
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
329
goto fallback;
211
exit(EXIT_FAILURE);
330
212
}
331
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
if(ret == -1){
214
if(ret < 0){
333
215
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
216
exit(EXIT_FAILURE);
336
217
}
337
218
338
219
/* The options we understand. */
340
221
{ .name = "global-options", .key = 'g',
341
222
.arg = "OPTION[,OPTION[,...]]",
342
223
.doc = "Options passed to all plugins" },
343
{ .name = "global-env", .key = 'G',
344
.arg = "VAR=value",
345
.doc = "Environment variable passed to all plugins" },
346
224
{ .name = "options-for", .key = 'o',
347
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
348
226
.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
227
{ .name = "disable", .key = 'd',
353
228
.arg = "PLUGIN",
354
229
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
358
230
{ .name = "plugin-dir", .key = 128,
359
231
.arg = "DIRECTORY",
360
232
.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 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
372
241
{ .name = NULL }
373
242
};
374
243
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
377
248
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 */
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
466
280
uid = (uid_t)strtol(arg, NULL, 10);
467
281
break;
468
case 131: /* --groupid */
282
case 130:
469
283
gid = (gid_t)strtol(arg, NULL, 10);
470
284
break;
471
case 132: /* --debug */
285
case 131:
472
286
debug = true;
473
287
break;
474
288
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 = "",
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
526
306
.doc = "Mandos plugin runner -- Run plugins" };
527
307
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);
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
531
309
if (ret == ARGP_ERR_UNKNOWN){
532
310
fprintf(stderr, "Unknown error while parsing arguments\n");
533
311
exitstatus = EXIT_FAILURE;
534
goto fallback;
312
goto end;
535
313
}
536
314
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){
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
556
325
perror("malloc");
557
326
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);
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
613
346
if (ret == ARGP_ERR_UNKNOWN){
614
347
fprintf(stderr, "Unknown error while parsing arguments\n");
615
348
exitstatus = EXIT_FAILURE;
616
goto fallback;
349
goto end;
617
350
}
618
351
}
619
352
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
353
if(debug){
630
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
355
fprintf(stderr, "Plugin: %s has %d arguments\n",
633
357
for(char **a = p->argv; *a != NULL; a++){
634
358
fprintf(stderr, "\tArg: %s\n", *a);
635
359
}
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
360
}
641
361
}
642
362
643
/* Strip permissions down to nobody */
644
363
ret = setuid(uid);
645
364
if (ret == -1){
646
365
perror("setuid");
647
}
366
}
367
648
368
setgid(gid);
649
369
if (ret == -1){
650
370
perror("setgid");
651
371
}
652
372
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
373
dir = opendir(plugindir);
659
374
if(dir == NULL){
660
375
perror("Could not open plugin dir");
661
376
exitstatus = EXIT_FAILURE;
662
goto fallback;
377
goto end;
663
378
}
664
379
665
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
670
385
if(ret < 0){
671
386
perror("set_cloexec_flag");
672
387
exitstatus = EXIT_FAILURE;
673
goto fallback;
388
goto end;
674
389
}
675
390
}
676
391
}
677
392
678
393
FD_ZERO(&rfds_all);
679
394
680
/* Read and execute any executable in the plugin directory*/
681
395
while(true){
682
396
dirst = readdir(dir);
683
397
684
/* All directory entries have been processed */
398
// All directory entries have been processed
685
399
if(dirst == NULL){
686
400
if (errno == EBADF){
687
401
perror("readdir");
688
402
exitstatus = EXIT_FAILURE;
689
goto fallback;
403
goto end;
690
404
}
691
405
break;
692
406
}
693
407
694
408
d_name_len = strlen(dirst->d_name);
695
409
696
/* Ignore dotfiles, backup files and other junk */
410
// Ignore dotfiles, backup files and other junk
697
411
{
698
412
bool bad_name = false;
699
413
701
415
702
416
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
417
".dpkg-old",
704
".dpkg-bak",
705
418
".dpkg-divert", NULL };
706
419
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
420
size_t pre_len = strlen(*pre);
715
428
break;
716
429
}
717
430
}
431
718
432
if(bad_name){
719
433
continue;
720
434
}
435
721
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
437
size_t suf_len = strlen(*suf);
723
438
if((d_name_len >= suf_len)
736
451
continue;
737
452
}
738
453
}
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");
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
748
458
continue;
749
459
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
750
463
751
464
ret = stat(filename, &st);
752
465
if (ret == -1){
754
467
free(filename);
755
468
continue;
756
469
}
757
758
/* Ignore non-executable files */
470
759
471
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
472
if(debug){
761
473
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
476
free(filename);
765
477
continue;
766
478
}
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){
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
775
480
if(debug){
776
481
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
482
dirst->d_name);
779
484
free(filename);
780
485
continue;
781
486
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
782
488
{
783
489
/* 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];
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
811
496
ret = pipe(pipefd);
812
497
if (ret == -1){
813
498
perror("pipe");
814
499
exitstatus = EXIT_FAILURE;
815
goto fallback;
500
goto end;
816
501
}
817
/* Ask OS to automatic close the pipe on exec */
818
502
ret = set_cloexec_flag(pipefd[0]);
819
503
if(ret < 0){
820
504
perror("set_cloexec_flag");
821
505
exitstatus = EXIT_FAILURE;
822
goto fallback;
506
goto end;
823
507
}
824
508
ret = set_cloexec_flag(pipefd[1]);
825
509
if(ret < 0){
826
510
perror("set_cloexec_flag");
827
511
exitstatus = EXIT_FAILURE;
828
goto fallback;
512
goto end;
829
513
}
830
514
/* Block SIGCHLD until process is safely in process list */
831
515
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
832
516
if(ret < 0){
833
517
perror("sigprocmask");
834
518
exitstatus = EXIT_FAILURE;
835
goto fallback;
519
goto end;
836
520
}
837
/* Starting a new process to be watched */
521
// Starting a new process to be watched
838
522
pid_t pid = fork();
839
523
if(pid == -1){
840
524
perror("fork");
841
525
exitstatus = EXIT_FAILURE;
842
goto fallback;
526
goto end;
843
527
}
844
528
if(pid == 0){
845
529
/* this is the child process */
848
532
perror("sigaction");
849
533
_exit(EXIT_FAILURE);
850
534
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
535
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
536
if(ret < 0){
853
537
perror("sigprocmask");
854
538
_exit(EXIT_FAILURE);
855
539
}
856
540
857
541
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
542
if(ret == -1){
859
543
perror("dup2");
865
549
above and must now close it manually here. */
866
550
closedir(dir);
867
551
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
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
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
878
555
}
879
556
/* no return */
880
557
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
558
/* parent process */
883
559
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
887
564
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
565
if(ret < 0){
889
perror("sigprocmask");
566
perror("sigprocmask");
890
567
}
891
568
exitstatus = EXIT_FAILURE;
892
goto fallback;
569
goto end;
893
570
}
894
571
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
898
577
/* Unblock SIGCHLD so signal handler can be run if this process
899
578
has already completed */
900
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
580
if(ret < 0){
902
581
perror("sigprocmask");
903
582
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;
911
}
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
912
599
}
913
600
914
601
closedir(dir);
915
602
dir = 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
}
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
926
608
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
609
while(process_list){
930
610
fd_set rfds = rfds_all;
931
611
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
612
if (select_ret == -1){
933
613
perror("select");
934
614
exitstatus = EXIT_FAILURE;
935
goto fallback;
615
goto end;
936
616
}
937
617
/* OK, now either a process completed, or something can be read
938
618
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
619
for(process *proc = process_list; proc ; proc = proc->next){
940
620
/* Is this process completely done? */
941
621
if(proc->eof and proc->completed){
942
622
/* Only accept the plugin output if it exited cleanly */
943
623
if(not WIFEXITED(proc->status)
944
624
or WEXITSTATUS(proc->status) != 0){
945
625
/* Bad exit by plugin */
946
947
626
if(debug){
948
627
if(WIFEXITED(proc->status)){
949
628
fprintf(stderr, "Plugin %u exited with status %d\n",
958
637
(unsigned int) (proc->pid));
959
638
}
960
639
}
961
962
640
/* Remove the plugin */
963
641
FD_CLR(proc->fd, &rfds_all);
964
965
642
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
644
if(ret < 0){
968
645
perror("sigprocmask");
969
646
exitstatus = EXIT_FAILURE;
970
goto fallback;
971
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
977
662
/* We are done modifying process list, so unblock signal */
978
663
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
664
NULL);
980
665
if(ret < 0){
981
666
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
991
674
}
992
993
675
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
676
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
678
if(not bret){
998
679
perror("print_out_password");
999
680
exitstatus = EXIT_FAILURE;
1000
681
}
1001
goto fallback;
682
goto end;
1002
683
}
1003
1004
684
/* This process has not completed. Does it have any output? */
1005
685
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
686
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
687
continue;
1009
688
}
1010
689
/* Before reading, make the process' data buffer large enough */
1014
693
if (proc->buffer == NULL){
1015
694
perror("malloc");
1016
695
exitstatus = EXIT_FAILURE;
1017
goto fallback;
696
goto end;
1018
697
}
1019
698
proc->buffer_size += BUFFER_SIZE;
1020
699
}
1021
700
/* Read from the process */
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(sret < 0){
701
ret = read(proc->fd, proc->buffer + proc->buffer_length,
702
BUFFER_SIZE);
703
if(ret < 0){
1025
704
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
705
continue;
1028
706
}
1029
if(sret == 0){
707
if(ret == 0){
1030
708
/* got EOF */
1031
709
proc->eof = true;
1032
710
} else {
1033
proc->buffer_length += (size_t) sret;
711
proc->buffer_length += (size_t) ret;
1034
712
}
1035
713
}
1036
714
}
1037
715
1038
716
1039
fallback:
717
end:
1040
718
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
1044
721
bool bret;
1045
722
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
723
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);
724
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
725
if(not bret){
1055
726
perror("print_out_password");
1056
727
exitstatus = EXIT_FAILURE;
728
goto end;
1057
729
}
1058
730
}
1059
731
1060
732
/* 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);
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
1072
742
}
1073
743
1074
744
if(dir != NULL){
1075
745
closedir(dir);
1076
746
}
1077
747
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
}
748
/* Free the process list and kill the processes */
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1087
756
}
757
free(process_list->buffer);
758
free(process_list);
1088
759
}
1089
760
1090
761
/* Wait for any remaining child processes to terminate */
1095
766
perror("wait");
1096
767
}
1097
768
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
769
return exitstatus;
1104
770
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0