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- Committer: Teddy Hogeborn
- Date: 2009-09-22 12:48:07 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20090922124807-i2cr0zv4vxjv38g4
* mandos-ctl: Made work again after D-Bus API changes.
(datetime_to_milliseconds): Renamed to "timedelta_to_milliseconds".
All callers changed.
(milliseconds_to_string): Use clearer mapping string format.
(string_to_delta): Add some comments.
(datetime_to_milliseconds): Renamed to "timedelta_to_milliseconds".
All callers changed.
(milliseconds_to_string): Use clearer mapping string format.
(string_to_delta): Add some comments.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- 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
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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,
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
66
71
67
72
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
73
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
77
const char *argp_program_version = "plugin-runner " VERSION;
71
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
79
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
87
80
typedef struct plugin{
88
81
char *name; /* can be NULL or any plugin name */
89
82
char **argv;
91
84
char **environ;
92
85
int envc;
93
86
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
94
97
struct plugin *next;
95
98
} plugin;
96
99
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
101
109
return p;
102
110
}
103
111
}
104
112
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
107
118
return NULL;
108
119
}
109
120
char *copy_name = NULL;
110
121
if(name != NULL){
111
copy_name = strdup(name);
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
112
125
if(copy_name == NULL){
126
free(new_plugin);
113
127
return NULL;
114
128
}
115
129
}
116
130
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
122
135
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
125
140
free(copy_name);
126
141
free(new_plugin);
127
142
return NULL;
128
143
}
129
144
new_plugin->argv[0] = copy_name;
130
145
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
133
150
if(new_plugin->environ == NULL){
134
151
free(copy_name);
135
152
free(new_plugin->argv);
137
154
return NULL;
138
155
}
139
156
new_plugin->environ[0] = NULL;
157
140
158
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
159
plugin_list = new_plugin;
142
160
return new_plugin;
143
161
}
144
162
146
164
static bool add_to_char_array(const char *new, char ***array,
147
165
int *len){
148
166
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
151
171
/* Malloc check */
152
172
if(*array == NULL){
153
173
return false;
154
174
}
155
175
/* Make a copy of the new string */
156
char *copy = strdup(new);
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
157
180
if(copy == NULL){
158
181
return false;
159
182
}
174
197
}
175
198
176
199
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
200
static bool add_environment(plugin *p, const char *def, bool replace){
178
201
if(p == NULL){
179
202
return false;
180
203
}
204
/* namelen = length of name of environment variable */
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
209
/* It already exists */
210
if(replace){
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
216
return false;
217
}
218
*e = new;
219
strcpy(*e, def);
220
}
221
return true;
222
}
223
}
181
224
return add_to_char_array(def, &(p->environ), &(p->envc));
182
225
}
183
226
184
185
227
/*
186
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
229
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
231
*/
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
193
234
/* If reading the flags failed, return error indication now. */
194
235
if(ret < 0){
195
236
return ret;
196
237
}
197
238
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
199
241
}
200
242
201
process *process_list = NULL;
202
243
203
244
/* Mark processes as completed when they exit, and save their exit
204
245
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
206
248
while(true){
207
process *proc = process_list;
249
plugin *proc = plugin_list;
208
250
int status;
209
251
pid_t pid = waitpid(-1, &status, WNOHANG);
210
252
if(pid == 0){
212
254
break;
213
255
}
214
256
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
217
260
}
218
/* No child processes */
219
break;
261
perror("waitpid");
220
262
}
221
263
222
264
/* A child exited, find it in process_list */
223
265
while(proc != NULL and proc->pid != pid){
224
266
proc = proc->next;
228
270
continue;
229
271
}
230
272
proc->status = status;
231
proc->completed = true;
273
proc->completed = 1;
232
274
}
275
errno = old_errno;
233
276
}
234
277
235
bool print_out_password(const char *buffer, size_t length){
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
236
280
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
281
for(size_t written = 0; written < length; written += (size_t)ret){
241
282
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
283
length - written));
247
288
return true;
248
289
}
249
290
250
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
291
/* Removes and free a plugin from the plugin list */
292
static void free_plugin(plugin *plugin_node){
293
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
295
free(*arg);
296
}
297
free(plugin_node->argv);
298
for(char **env = plugin_node->environ; *env != NULL; env++){
299
free(*env);
300
}
301
free(plugin_node->environ);
302
free(plugin_node->buffer);
303
304
/* Removes the plugin from the singly-linked list */
305
if(plugin_node == plugin_list){
306
/* First one - simple */
307
plugin_list = plugin_list->next;
308
} else {
309
/* Second one or later */
310
for(plugin *p = plugin_list; p != NULL; p = p->next){
311
if(p->next == plugin_node){
312
p->next = plugin_node->next;
313
break;
314
}
315
}
316
}
317
318
free(plugin_node);
319
}
320
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
262
324
}
263
325
}
264
326
265
327
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
328
char *plugindir = NULL;
329
char *argfile = NULL;
268
330
FILE *conffp;
269
331
size_t d_name_len;
270
332
DIR *dir = NULL;
272
334
struct stat st;
273
335
fd_set rfds_all;
274
336
int ret, maxfd = 0;
337
ssize_t sret;
275
338
uid_t uid = 65534;
276
339
gid_t gid = 65534;
277
340
bool debug = false;
302
365
{ .name = "global-options", .key = 'g',
303
366
.arg = "OPTION[,OPTION[,...]]",
304
367
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
368
{ .name = "global-env", .key = 'G',
306
369
.arg = "VAR=value",
307
370
.doc = "Environment variable passed to all plugins" },
308
371
{ .name = "options-for", .key = 'o',
309
372
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
310
373
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
374
{ .name = "env-for", .key = 'E',
312
375
.arg = "PLUGIN:ENV=value",
313
376
.doc = "Environment variable passed to specified plugin" },
314
377
{ .name = "disable", .key = 'd',
315
378
.arg = "PLUGIN",
316
379
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
317
383
{ .name = "plugin-dir", .key = 128,
318
384
.arg = "DIRECTORY",
319
385
.doc = "Specify a different plugin directory", .group = 2 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.doc = "Debug mode", .group = 3 },
386
{ .name = "config-file", .key = 129,
387
.arg = "FILE",
388
.doc = "Specify a different configuration file", .group = 2 },
389
{ .name = "userid", .key = 130,
390
.arg = "ID", .flags = 0,
391
.doc = "User ID the plugins will run as", .group = 3 },
392
{ .name = "groupid", .key = 131,
393
.arg = "ID", .flags = 0,
394
.doc = "Group ID the plugins will run as", .group = 3 },
395
{ .name = "debug", .key = 132,
396
.doc = "Debug mode", .group = 4 },
328
397
{ .name = NULL }
329
398
};
330
399
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
335
switch (key) {
336
case 'g':
337
if (arg != NULL){
338
char *p;
339
while((p = strsep(&arg, ",")) != NULL){
340
if(p[0] == '\0'){
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
402
switch(key){
403
char *tmp;
404
intmax_t tmpmax;
405
case 'g': /* --global-options */
406
if(arg != NULL){
407
char *plugin_option;
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
341
410
continue;
342
411
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
412
if(not add_argument(getplugin(NULL), plugin_option)){
344
413
perror("add_argument");
345
414
return ARGP_ERR_UNKNOWN;
346
415
}
347
416
}
348
417
}
349
418
break;
350
case 'e':
419
case 'G': /* --global-env */
351
420
if(arg == NULL){
352
421
break;
353
422
}
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
362
425
}
363
426
break;
364
case 'o':
365
if (arg != NULL){
366
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
368
break;
369
}
370
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
372
break;
373
}
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
427
case 'o': /* --options-for */
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
384
438
}
385
439
}
386
440
}
387
441
break;
388
case 'f':
442
case 'E': /* --env-for */
389
443
if(arg == NULL){
390
444
break;
391
445
}
394
448
if(envdef == NULL){
395
449
break;
396
450
}
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
401
envdef++;
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
403
453
perror("add_environment");
404
454
}
405
455
}
406
456
break;
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
410
460
if(p == NULL){
411
461
return ARGP_ERR_UNKNOWN;
412
462
}
413
463
p->disabled = true;
414
464
}
415
465
break;
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
420
uid = (uid_t)strtol(arg, NULL, 10);
421
break;
422
case 130:
423
gid = (gid_t)strtol(arg, NULL, 10);
424
break;
425
case 131:
466
case 'e': /* --enable */
467
if(arg != NULL){
468
plugin *p = getplugin(arg);
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
471
}
472
p->disabled = false;
473
}
474
break;
475
case 128: /* --plugin-dir */
476
free(plugindir);
477
plugindir = strdup(arg);
478
if(plugindir == NULL){
479
perror("strdup");
480
}
481
break;
482
case 129: /* --config-file */
483
/* This is already done by parse_opt_config_file() */
484
break;
485
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
494
}
495
break;
496
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
505
}
506
break;
507
case 132: /* --debug */
426
508
debug = true;
427
509
break;
428
case ARGP_KEY_ARG:
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
510
/*
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
513
*/
514
case ARGP_KEY_ARG:
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
/* This option parser is the same as parse_opt() above, except it
531
ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
535
switch(key){
536
case 'g': /* --global-options */
537
case 'G': /* --global-env */
538
case 'o': /* --options-for */
539
case 'E': /* --env-for */
540
case 'd': /* --disable */
541
case 'e': /* --enable */
542
case 128: /* --plugin-dir */
543
break;
544
case 129: /* --config-file */
545
free(argfile);
546
argfile = strdup(arg);
547
if(argfile == NULL){
548
perror("strdup");
549
}
550
break;
551
case 130: /* --userid */
552
case 131: /* --groupid */
553
case 132: /* --debug */
554
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
556
break;
557
default:
558
return ARGP_ERR_UNKNOWN;
559
}
560
return 0;
561
}
562
563
struct argp argp = { .options = options,
564
.parser = parse_opt_config_file,
565
.args_doc = "",
443
566
.doc = "Mandos plugin runner -- Run plugins" };
444
567
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
568
/* Parse using parse_opt_config_file() in order to get the custom
569
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
447
572
fprintf(stderr, "Unknown error while parsing arguments\n");
448
573
exitstatus = EXIT_FAILURE;
449
574
goto fallback;
450
575
}
451
452
conffp = fopen(argfile, "r");
576
577
/* Reset to the normal argument parser */
578
argp.parser = parse_opt;
579
580
/* Open the configfile if available */
581
if(argfile == NULL){
582
conffp = fopen(AFILE, "r");
583
} else {
584
conffp = fopen(argfile, "r");
585
}
453
586
if(conffp != NULL){
454
587
char *org_line = NULL;
455
588
char *p, *arg, *new_arg, *line;
456
589
size_t size = 0;
457
ssize_t sret;
458
590
const char whitespace_delims[] = " \r\t\f\v\n";
459
591
const char comment_delim[] = "#";
460
592
461
593
custom_argc = 1;
462
594
custom_argv = malloc(sizeof(char*) * 2);
463
595
if(custom_argv == NULL){
468
600
custom_argv[0] = argv[0];
469
601
custom_argv[1] = NULL;
470
602
603
/* for each line in the config file, strip whitespace and ignore
604
commented text */
471
605
while(true){
472
606
sret = getline(&org_line, &size, conffp);
473
607
if(sret == -1){
474
608
break;
475
609
}
476
610
477
611
line = org_line;
478
612
arg = strsep(&line, comment_delim);
479
613
while((p = strsep(&arg, whitespace_delims)) != NULL){
481
615
continue;
482
616
}
483
617
new_arg = strdup(p);
484
618
if(new_arg == NULL){
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
621
free(org_line);
622
goto fallback;
623
}
624
485
625
custom_argc += 1;
486
626
custom_argv = realloc(custom_argv, sizeof(char *)
487
627
* ((unsigned int) custom_argc + 1));
492
632
goto fallback;
493
633
}
494
634
custom_argv[custom_argc-1] = new_arg;
495
custom_argv[custom_argc] = NULL;
635
custom_argv[custom_argc] = NULL;
496
636
}
497
637
}
638
do {
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
641
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
644
goto fallback;
645
}
498
646
free(org_line);
499
} else{
647
} else {
500
648
/* Check for harmful errors and go to fallback. Other errors might
501
649
not affect opening plugins */
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
651
perror("fopen");
504
652
exitstatus = EXIT_FAILURE;
505
653
goto fallback;
506
654
}
507
655
}
508
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
509
658
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
512
662
fprintf(stderr, "Unknown error while parsing arguments\n");
513
663
exitstatus = EXIT_FAILURE;
514
664
goto fallback;
515
665
}
516
666
}
517
667
668
/* Parse actual command line arguments, to let them override the
669
config file */
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
674
goto fallback;
675
}
676
518
677
if(debug){
519
678
for(plugin *p = plugin_list; p != NULL; p=p->next){
520
679
fprintf(stderr, "Plugin: %s has %d arguments\n",
522
681
for(char **a = p->argv; *a != NULL; a++){
523
682
fprintf(stderr, "\tArg: %s\n", *a);
524
683
}
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
526
685
for(char **a = p->environ; *a != NULL; a++){
527
686
fprintf(stderr, "\t%s\n", *a);
528
687
}
529
688
}
530
689
}
531
690
691
/* Strip permissions down to nobody */
692
setgid(gid);
693
if(ret == -1){
694
perror("setgid");
695
}
532
696
ret = setuid(uid);
533
if (ret == -1){
697
if(ret == -1){
534
698
perror("setuid");
535
699
}
536
700
537
setgid(gid);
538
if (ret == -1){
539
perror("setgid");
701
if(plugindir == NULL){
702
dir = opendir(PDIR);
703
} else {
704
dir = opendir(plugindir);
540
705
}
541
706
542
dir = opendir(plugindir);
543
707
if(dir == NULL){
544
708
perror("Could not open plugin dir");
545
709
exitstatus = EXIT_FAILURE;
561
725
562
726
FD_ZERO(&rfds_all);
563
727
728
/* Read and execute any executable in the plugin directory*/
564
729
while(true){
565
dirst = readdir(dir);
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
566
733
567
// All directory entries have been processed
734
/* All directory entries have been processed */
568
735
if(dirst == NULL){
569
if (errno == EBADF){
736
if(errno == EBADF){
570
737
perror("readdir");
571
738
exitstatus = EXIT_FAILURE;
572
739
goto fallback;
576
743
577
744
d_name_len = strlen(dirst->d_name);
578
745
579
// Ignore dotfiles, backup files and other junk
746
/* Ignore dotfiles, backup files and other junk */
580
747
{
581
748
bool bad_name = false;
582
749
584
751
585
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
753
".dpkg-old",
754
".dpkg-bak",
587
755
".dpkg-divert", NULL };
588
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
757
size_t pre_len = strlen(*pre);
597
765
break;
598
766
}
599
767
}
600
601
768
if(bad_name){
602
769
continue;
603
770
}
604
605
771
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
772
size_t suf_len = strlen(*suf);
607
773
if((d_name_len >= suf_len)
620
786
continue;
621
787
}
622
788
}
623
789
624
790
char *filename;
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
793
dirst->d_name));
794
} else {
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
796
plugindir,
797
dirst->d_name));
798
}
626
799
if(ret < 0){
627
800
perror("asprintf");
628
801
continue;
629
802
}
630
803
631
ret = stat(filename, &st);
632
if (ret == -1){
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
633
806
perror("stat");
634
807
free(filename);
635
808
continue;
636
809
}
637
810
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
639
814
if(debug){
640
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
641
816
" with bad type or mode\n", filename);
643
818
free(filename);
644
819
continue;
645
820
}
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
821
822
plugin *p = getplugin(dirst->d_name);
647
823
if(p == NULL){
648
824
perror("getplugin");
649
825
free(filename);
659
835
}
660
836
{
661
837
/* Add global arguments to argument list for this plugin */
662
plugin *g = getplugin(NULL, &plugin_list);
838
plugin *g = getplugin(NULL);
663
839
if(g != NULL){
664
840
for(char **a = g->argv + 1; *a != NULL; a++){
665
841
if(not add_argument(p, *a)){
668
844
}
669
845
/* Add global environment variables */
670
846
for(char **e = g->environ; *e != NULL; e++){
671
if(not add_environment(p, *e)){
847
if(not add_environment(p, *e, false)){
672
848
perror("add_environment");
673
849
}
674
850
}
679
855
process, too. */
680
856
if(p->environ[0] != NULL){
681
857
for(char **e = environ; *e != NULL; e++){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
858
if(not add_environment(p, *e, false)){
688
859
perror("add_environment");
689
860
}
690
861
}
691
862
}
692
863
693
864
int pipefd[2];
694
ret = pipe(pipefd);
695
if (ret == -1){
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
696
867
perror("pipe");
697
868
exitstatus = EXIT_FAILURE;
698
869
goto fallback;
699
870
}
871
/* Ask OS to automatic close the pipe on exec */
700
872
ret = set_cloexec_flag(pipefd[0]);
701
873
if(ret < 0){
702
874
perror("set_cloexec_flag");
710
882
goto fallback;
711
883
}
712
884
/* Block SIGCHLD until process is safely in process list */
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
887
NULL));
714
888
if(ret < 0){
715
889
perror("sigprocmask");
716
890
exitstatus = EXIT_FAILURE;
717
891
goto fallback;
718
892
}
719
// Starting a new process to be watched
720
pid_t pid = fork();
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
721
898
if(pid == -1){
722
899
perror("fork");
723
900
exitstatus = EXIT_FAILURE;
730
907
perror("sigaction");
731
908
_exit(EXIT_FAILURE);
732
909
}
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
734
911
if(ret < 0){
735
912
perror("sigprocmask");
736
913
_exit(EXIT_FAILURE);
737
914
}
738
915
739
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
740
917
if(ret == -1){
741
918
perror("dup2");
760
937
}
761
938
/* no return */
762
939
}
763
/* parent process */
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
764
943
free(filename);
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
769
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
944
plugin *new_plugin = getplugin(dirst->d_name);
945
if(new_plugin == NULL){
946
perror("getplugin");
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
949
NULL)));
770
950
if(ret < 0){
771
perror("sigprocmask");
951
perror("sigprocmask");
772
952
}
773
953
exitstatus = EXIT_FAILURE;
774
954
goto fallback;
775
955
}
776
956
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
782
960
/* Unblock SIGCHLD so signal handler can be run if this process
783
961
has already completed */
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
785
965
if(ret < 0){
786
966
perror("sigprocmask");
787
967
exitstatus = EXIT_FAILURE;
788
968
goto fallback;
789
969
}
790
970
791
FD_SET(new_process->fd, &rfds_all);
971
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
972
-Wconversion */
792
973
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
974
if(maxfd < new_plugin->fd){
975
maxfd = new_plugin->fd;
795
976
}
796
797
977
}
798
978
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
closedir(dir);
979
TEMP_FAILURE_RETRY(closedir(dir));
803
980
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
981
free_plugin(getplugin(NULL));
982
983
for(plugin *p = plugin_list; p != NULL; p = p->next){
984
if(p->pid != 0){
985
break;
986
}
987
if(p->next == NULL){
988
fprintf(stderr, "No plugin processes started. Incorrect plugin"
989
" directory?\n");
990
free_plugin_list();
991
}
809
992
}
810
while(process_list){
993
994
/* Main loop while running plugins exist */
995
while(plugin_list){
811
996
fd_set rfds = rfds_all;
812
997
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
if (select_ret == -1){
998
if(select_ret == -1 and errno != EINTR){
814
999
perror("select");
815
1000
exitstatus = EXIT_FAILURE;
816
1001
goto fallback;
817
1002
}
818
1003
/* OK, now either a process completed, or something can be read
819
1004
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
1005
for(plugin *proc = plugin_list; proc != NULL;){
821
1006
/* Is this process completely done? */
822
if(proc->eof and proc->completed){
1007
if(proc->completed and proc->eof){
823
1008
/* Only accept the plugin output if it exited cleanly */
824
1009
if(not WIFEXITED(proc->status)
825
1010
or WEXITSTATUS(proc->status) != 0){
826
1011
/* Bad exit by plugin */
1012
827
1013
if(debug){
828
1014
if(WIFEXITED(proc->status)){
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
1015
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1016
" status %d\n", proc->name,
1017
(intmax_t) (proc->pid),
831
1018
WEXITSTATUS(proc->status));
832
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
835
WTERMSIG(proc->status));
1019
} else if(WIFSIGNALED(proc->status)){
1020
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1021
" signal %d: %s\n", proc->name,
1022
(intmax_t) (proc->pid),
1023
WTERMSIG(proc->status),
1024
strsignal(WTERMSIG(proc->status)));
836
1025
} else if(WCOREDUMP(proc->status)){
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
1026
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1027
" core\n", proc->name, (intmax_t) (proc->pid));
839
1028
}
840
1029
}
1030
841
1031
/* Remove the plugin */
842
FD_CLR(proc->fd, &rfds_all);
1032
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1033
-Wconversion */
1034
843
1035
/* Block signal while modifying process_list */
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1036
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1037
(SIG_BLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
845
1040
if(ret < 0){
846
1041
perror("sigprocmask");
847
1042
exitstatus = EXIT_FAILURE;
848
1043
goto fallback;
849
1044
}
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
1045
1046
plugin *next_plugin = proc->next;
1047
free_plugin(proc);
1048
proc = next_plugin;
1049
863
1050
/* We are done modifying process list, so unblock signal */
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1051
ret = (int)(TEMP_FAILURE_RETRY
1052
(sigprocmask(SIG_UNBLOCK,
1053
&sigchld_action.sa_mask, NULL)));
866
1054
if(ret < 0){
867
1055
perror("sigprocmask");
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
1056
exitstatus = EXIT_FAILURE;
1057
goto fallback;
1058
}
1059
1060
if(plugin_list == NULL){
1061
break;
1062
}
1063
1064
continue;
875
1065
}
1066
876
1067
/* This process exited nicely, so print its buffer */
877
1068
878
1069
bool bret = print_out_password(proc->buffer,
879
1070
proc->buffer_length);
880
1071
if(not bret){
883
1074
}
884
1075
goto fallback;
885
1076
}
1077
886
1078
/* This process has not completed. Does it have any output? */
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1079
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1080
warning from
1081
-Wconversion */
888
1082
/* This process had nothing to say at this time */
1083
proc = proc->next;
889
1084
continue;
890
1085
}
891
1086
/* Before reading, make the process' data buffer large enough */
892
1087
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
893
1088
proc->buffer = realloc(proc->buffer, proc->buffer_size
894
1089
+ (size_t) BUFFER_SIZE);
895
if (proc->buffer == NULL){
1090
if(proc->buffer == NULL){
896
1091
perror("malloc");
897
1092
exitstatus = EXIT_FAILURE;
898
1093
goto fallback;
900
1095
proc->buffer_size += BUFFER_SIZE;
901
1096
}
902
1097
/* Read from the process */
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1098
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1099
proc->buffer
1100
+ proc->buffer_length,
1101
BUFFER_SIZE));
1102
if(sret < 0){
906
1103
/* Read error from this process; ignore the error */
1104
proc = proc->next;
907
1105
continue;
908
1106
}
909
if(ret == 0){
1107
if(sret == 0){
910
1108
/* got EOF */
911
1109
proc->eof = true;
912
1110
} else {
913
proc->buffer_length += (size_t) ret;
1111
proc->buffer_length += (size_t) sret;
914
1112
}
915
1113
}
916
1114
}
917
918
1115
1116
919
1117
fallback:
920
1118
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1119
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
922
1120
/* Fallback if all plugins failed, none are found or an error
923
1121
occured */
924
1122
bool bret;
925
1123
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1124
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1125
size_t len = strlen(passwordbuffer);
1126
/* Strip trailing newline */
1127
if(len > 0 and passwordbuffer[len-1] == '\n'){
1128
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1129
len--;
1130
}
1131
bret = print_out_password(passwordbuffer, len);
928
1132
if(not bret){
929
1133
perror("print_out_password");
930
1134
exitstatus = EXIT_FAILURE;
937
1141
perror("sigaction");
938
1142
exitstatus = EXIT_FAILURE;
939
1143
}
940
1144
941
1145
if(custom_argv != NULL){
942
1146
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1147
free(*arg);
944
1148
}
945
1149
free(custom_argv);
946
1150
}
947
free_plugin_list(plugin_list);
948
1151
949
1152
if(dir != NULL){
950
1153
closedir(dir);
951
1154
}
952
1155
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1156
/* Kill the processes */
1157
for(plugin *p = plugin_list; p != NULL; p = p->next){
1158
if(p->pid != 0){
1159
close(p->fd);
1160
ret = kill(p->pid, SIGTERM);
1161
if(ret == -1 and errno != ESRCH){
1162
/* Set-uid proccesses might not get closed */
1163
perror("kill");
1164
}
961
1165
}
962
free(process_list->buffer);
963
free(process_list);
964
1166
}
965
1167
966
1168
/* Wait for any remaining child processes to terminate */
967
do{
1169
do {
968
1170
ret = wait(NULL);
969
1171
} while(ret >= 0);
970
1172
if(errno != ECHILD){
971
1173
perror("wait");
972
1174
}
973
1175
1176
free_plugin_list();
1177
1178
free(plugindir);
1179
free(argfile);
1180
974
1181
return exitstatus;
975
1182
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0