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- Committer: Björn Påhlsson
- Date: 2008-08-25 01:40:55 UTC
- mfrom: (103 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 107.
- Revision ID: belorn@braxen-20080825014055-pv5v6vqwb7wjmxqx
merge
- files added:
- plugins.d/usplash
- 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
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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
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,
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
66
72
67
#define BUFFER_SIZE 256
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;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
78
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
72
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
80
87
typedef struct plugin{
81
88
char *name; /* can be NULL or any plugin name */
82
89
char **argv;
84
91
char **environ;
85
92
int envc;
86
93
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;
97
94
struct plugin *next;
98
95
} plugin;
99
96
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))){
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))){
109
101
return p;
110
102
}
111
103
}
112
104
/* Create a new plugin */
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){
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
118
107
return NULL;
119
108
}
120
109
char *copy_name = NULL;
121
110
if(name != NULL){
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
111
copy_name = strdup(name);
125
112
if(copy_name == NULL){
126
free(new_plugin);
127
113
return NULL;
128
114
}
129
115
}
130
116
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
135
122
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){
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
140
125
free(copy_name);
141
126
free(new_plugin);
142
127
return NULL;
143
128
}
144
129
new_plugin->argv[0] = copy_name;
145
130
new_plugin->argv[1] = NULL;
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
131
132
new_plugin->environ = malloc(sizeof(char *));
150
133
if(new_plugin->environ == NULL){
151
134
free(copy_name);
152
135
free(new_plugin->argv);
154
137
return NULL;
155
138
}
156
139
new_plugin->environ[0] = NULL;
157
158
140
/* Append the new plugin to the list */
159
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
160
142
return new_plugin;
161
143
}
162
144
164
146
static bool add_to_char_array(const char *new, char ***array,
165
147
int *len){
166
148
/* Resize the pointed-to array to hold one more pointer */
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
171
151
/* Malloc check */
172
152
if(*array == NULL){
173
153
return false;
174
154
}
175
155
/* Make a copy of the new string */
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
156
char *copy = strdup(new);
180
157
if(copy == NULL){
181
158
return false;
182
159
}
197
174
}
198
175
199
176
/* Add to a plugin's environment */
200
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
201
178
if(p == NULL){
202
179
return false;
203
180
}
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
}
224
181
return add_to_char_array(def, &(p->environ), &(p->envc));
225
182
}
226
183
184
227
185
/*
228
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
187
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
231
189
*/
232
static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
234
193
/* If reading the flags failed, return error indication now. */
235
194
if(ret < 0){
236
195
return ret;
237
196
}
238
197
/* Store modified flag word in the descriptor. */
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
240
199
}
241
200
201
process *process_list = NULL;
242
202
243
203
/* Mark processes as completed when they exit, and save their exit
244
204
status. */
245
static void handle_sigchld(__attribute__((unused)) int sig){
246
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
247
206
while(true){
248
plugin *proc = plugin_list;
207
process *proc = process_list;
249
208
int status;
250
209
pid_t pid = waitpid(-1, &status, WNOHANG);
251
210
if(pid == 0){
253
212
break;
254
213
}
255
214
if(pid == -1){
256
if(errno == ECHILD){
257
/* No child processes */
258
break;
215
if (errno != ECHILD){
216
perror("waitpid");
259
217
}
260
perror("waitpid");
218
/* No child processes */
219
break;
261
220
}
262
221
263
222
/* A child exited, find it in process_list */
264
223
while(proc != NULL and proc->pid != pid){
265
224
proc = proc->next;
269
228
continue;
270
229
}
271
230
proc->status = status;
272
proc->completed = 1;
231
proc->completed = true;
273
232
}
274
errno = old_errno;
275
233
}
276
234
277
/* Prints out a password to stdout */
278
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
279
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
280
240
for(size_t written = 0; written < length; written += (size_t)ret){
281
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
282
242
length - written));
287
247
return true;
288
248
}
289
249
290
/* Removes and free a plugin from the plugin list */
291
static void free_plugin(plugin *plugin_node){
292
293
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
294
free(*arg);
295
}
296
free(plugin_node->argv);
297
for(char **env = plugin_node->environ; *env != NULL; env++){
298
free(*env);
299
}
300
free(plugin_node->environ);
301
free(plugin_node->buffer);
302
303
/* Removes the plugin from the singly-linked list */
304
if(plugin_node == plugin_list){
305
/* First one - simple */
306
plugin_list = plugin_list->next;
307
} else {
308
/* Second one or later */
309
for(plugin *p = plugin_list; p != NULL; p = p->next){
310
if(p->next == plugin_node){
311
p->next = plugin_node->next;
312
break;
313
}
314
}
315
}
316
317
free(plugin_node);
318
}
319
320
static void free_plugin_list(void){
321
while(plugin_list != NULL){
322
free_plugin(plugin_list);
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);
323
262
}
324
263
}
325
264
326
265
int main(int argc, char *argv[]){
327
char *plugindir = NULL;
328
char *argfile = NULL;
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
329
268
FILE *conffp;
330
269
size_t d_name_len;
331
270
DIR *dir = NULL;
333
272
struct stat st;
334
273
fd_set rfds_all;
335
274
int ret, maxfd = 0;
336
ssize_t sret;
337
275
uid_t uid = 65534;
338
276
gid_t gid = 65534;
339
277
bool debug = false;
364
302
{ .name = "global-options", .key = 'g',
365
303
.arg = "OPTION[,OPTION[,...]]",
366
304
.doc = "Options passed to all plugins" },
367
{ .name = "global-env", .key = 'G',
305
{ .name = "global-envs", .key = 'e',
368
306
.arg = "VAR=value",
369
307
.doc = "Environment variable passed to all plugins" },
370
308
{ .name = "options-for", .key = 'o',
371
309
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
372
310
.doc = "Options passed only to specified plugin" },
373
{ .name = "env-for", .key = 'E',
311
{ .name = "envs-for", .key = 'f',
374
312
.arg = "PLUGIN:ENV=value",
375
313
.doc = "Environment variable passed to specified plugin" },
376
314
{ .name = "disable", .key = 'd',
377
315
.arg = "PLUGIN",
378
316
.doc = "Disable a specific plugin", .group = 1 },
379
{ .name = "enable", .key = 'e',
380
.arg = "PLUGIN",
381
.doc = "Enable a specific plugin", .group = 1 },
382
317
{ .name = "plugin-dir", .key = 128,
383
318
.arg = "DIRECTORY",
384
319
.doc = "Specify a different plugin directory", .group = 2 },
385
{ .name = "config-file", .key = 129,
386
.arg = "FILE",
387
.doc = "Specify a different configuration file", .group = 2 },
388
{ .name = "userid", .key = 130,
389
.arg = "ID", .flags = 0,
390
.doc = "User ID the plugins will run as", .group = 3 },
391
{ .name = "groupid", .key = 131,
392
.arg = "ID", .flags = 0,
393
.doc = "Group ID the plugins will run as", .group = 3 },
394
{ .name = "debug", .key = 132,
395
.doc = "Debug mode", .group = 4 },
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 },
396
328
{ .name = NULL }
397
329
};
398
330
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
401
switch(key){
402
char *tmp;
403
intmax_t tmpmax;
404
case 'g': /* --global-options */
405
if(arg != NULL){
406
char *plugin_option;
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
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'){
409
341
continue;
410
342
}
411
if(not add_argument(getplugin(NULL), plugin_option)){
343
if(not add_argument(getplugin(NULL, plugins), p)){
412
344
perror("add_argument");
413
345
return ARGP_ERR_UNKNOWN;
414
346
}
415
347
}
416
348
}
417
349
break;
418
case 'G': /* --global-env */
350
case 'e':
419
351
if(arg == NULL){
420
352
break;
421
353
}
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
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
}
424
362
}
425
363
break;
426
case 'o': /* --options-for */
427
if(arg != NULL){
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
430
break;
431
}
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
return ARGP_ERR_UNKNOWN;
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
}
437
384
}
438
385
}
439
386
}
440
387
break;
441
case 'E': /* --env-for */
388
case 'f':
442
389
if(arg == NULL){
443
390
break;
444
391
}
447
394
if(envdef == NULL){
448
395
break;
449
396
}
450
*envdef = '\0';
451
if(not add_environment(getplugin(arg), envdef+1, true)){
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)){
452
403
perror("add_environment");
453
404
}
454
405
}
455
406
break;
456
case 'd': /* --disable */
457
if(arg != NULL){
458
plugin *p = getplugin(arg);
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
459
410
if(p == NULL){
460
411
return ARGP_ERR_UNKNOWN;
461
412
}
462
413
p->disabled = true;
463
414
}
464
415
break;
465
case 'e': /* --enable */
466
if(arg != NULL){
467
plugin *p = getplugin(arg);
468
if(p == NULL){
469
return ARGP_ERR_UNKNOWN;
470
}
471
p->disabled = false;
472
}
473
break;
474
case 128: /* --plugin-dir */
475
free(plugindir);
476
plugindir = strdup(arg);
477
if(plugindir == NULL){
478
perror("strdup");
479
}
480
break;
481
case 129: /* --config-file */
482
/* This is already done by parse_opt_config_file() */
483
break;
484
case 130: /* --userid */
485
errno = 0;
486
tmpmax = strtoimax(arg, &tmp, 10);
487
if(errno != 0 or tmp == arg or *tmp != '\0'
488
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
491
} else {
492
uid = (uid_t)tmpmax;
493
}
494
break;
495
case 131: /* --groupid */
496
errno = 0;
497
tmpmax = strtoimax(arg, &tmp, 10);
498
if(errno != 0 or tmp == arg or *tmp != '\0'
499
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
502
} else {
503
gid = (gid_t)tmpmax;
504
}
505
break;
506
case 132: /* --debug */
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:
507
426
debug = true;
508
427
break;
509
/*
510
* When adding more options before this line, remember to also add a
511
* "case" to the "parse_opt_config_file" function below.
512
*/
513
case ARGP_KEY_ARG:
514
/* Cryptsetup always passes an argument, which is an empty
515
string if "none" was specified in /etc/crypttab. So if
516
argument was empty, we ignore it silently. */
517
if(arg[0] != '\0'){
518
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
519
}
520
break;
521
case ARGP_KEY_END:
522
break;
523
default:
524
return ARGP_ERR_UNKNOWN;
525
}
526
return 0;
527
}
528
529
/* This option parser is the same as parse_opt() above, except it
530
ignores everything but the --config-file option. */
531
error_t parse_opt_config_file(int key, char *arg,
532
__attribute__((unused))
533
struct argp_state *state){
534
switch(key){
535
case 'g': /* --global-options */
536
case 'G': /* --global-env */
537
case 'o': /* --options-for */
538
case 'E': /* --env-for */
539
case 'd': /* --disable */
540
case 'e': /* --enable */
541
case 128: /* --plugin-dir */
542
break;
543
case 129: /* --config-file */
544
free(argfile);
545
argfile = strdup(arg);
546
if(argfile == NULL){
547
perror("strdup");
548
}
549
break;
550
case 130: /* --userid */
551
case 131: /* --groupid */
552
case 132: /* --debug */
553
case ARGP_KEY_ARG:
554
case ARGP_KEY_END:
555
break;
556
default:
557
return ARGP_ERR_UNKNOWN;
558
}
559
return 0;
560
}
561
562
struct argp argp = { .options = options,
563
.parser = parse_opt_config_file,
564
.args_doc = "",
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]",
565
443
.doc = "Mandos plugin runner -- Run plugins" };
566
444
567
/* Parse using parse_opt_config_file() in order to get the custom
568
config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
if (ret == ARGP_ERR_UNKNOWN){
571
447
fprintf(stderr, "Unknown error while parsing arguments\n");
572
448
exitstatus = EXIT_FAILURE;
573
449
goto fallback;
574
450
}
575
576
/* Reset to the normal argument parser */
577
argp.parser = parse_opt;
578
579
/* Open the configfile if available */
580
if(argfile == NULL){
581
conffp = fopen(AFILE, "r");
582
} else {
583
conffp = fopen(argfile, "r");
584
}
451
452
conffp = fopen(argfile, "r");
585
453
if(conffp != NULL){
586
454
char *org_line = NULL;
587
455
char *p, *arg, *new_arg, *line;
588
456
size_t size = 0;
457
ssize_t sret;
589
458
const char whitespace_delims[] = " \r\t\f\v\n";
590
459
const char comment_delim[] = "#";
591
460
592
461
custom_argc = 1;
593
462
custom_argv = malloc(sizeof(char*) * 2);
594
463
if(custom_argv == NULL){
599
468
custom_argv[0] = argv[0];
600
469
custom_argv[1] = NULL;
601
470
602
/* for each line in the config file, strip whitespace and ignore
603
commented text */
604
471
while(true){
605
472
sret = getline(&org_line, &size, conffp);
606
473
if(sret == -1){
607
474
break;
608
475
}
609
476
610
477
line = org_line;
611
478
arg = strsep(&line, comment_delim);
612
479
while((p = strsep(&arg, whitespace_delims)) != NULL){
614
481
continue;
615
482
}
616
483
new_arg = strdup(p);
617
if(new_arg == NULL){
618
perror("strdup");
619
exitstatus = EXIT_FAILURE;
620
free(org_line);
621
goto fallback;
622
}
623
484
624
485
custom_argc += 1;
625
486
custom_argv = realloc(custom_argv, sizeof(char *)
626
487
* ((unsigned int) custom_argc + 1));
631
492
goto fallback;
632
493
}
633
494
custom_argv[custom_argc-1] = new_arg;
634
custom_argv[custom_argc] = NULL;
495
custom_argv[custom_argc] = NULL;
635
496
}
636
497
}
637
do {
638
ret = fclose(conffp);
639
} while(ret == EOF and errno == EINTR);
640
if(ret == EOF){
641
perror("fclose");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
644
}
645
498
free(org_line);
646
} else {
499
} else{
647
500
/* Check for harmful errors and go to fallback. Other errors might
648
501
not affect opening plugins */
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
503
perror("fopen");
651
504
exitstatus = EXIT_FAILURE;
652
505
goto fallback;
653
506
}
654
507
}
655
/* If there was any arguments from configuration file,
656
pass them to parser as command arguments */
508
657
509
if(custom_argv != NULL){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
659
0, NULL);
660
if(ret == ARGP_ERR_UNKNOWN){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
if (ret == ARGP_ERR_UNKNOWN){
661
512
fprintf(stderr, "Unknown error while parsing arguments\n");
662
513
exitstatus = EXIT_FAILURE;
663
514
goto fallback;
664
515
}
665
516
}
666
517
667
/* Parse actual command line arguments, to let them override the
668
config file */
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
674
}
675
676
518
if(debug){
677
519
for(plugin *p = plugin_list; p != NULL; p=p->next){
678
520
fprintf(stderr, "Plugin: %s has %d arguments\n",
680
522
for(char **a = p->argv; *a != NULL; a++){
681
523
fprintf(stderr, "\tArg: %s\n", *a);
682
524
}
683
fprintf(stderr, "...and %d environment variables\n", p->envc);
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
526
for(char **a = p->environ; *a != NULL; a++){
685
527
fprintf(stderr, "\t%s\n", *a);
686
528
}
687
529
}
688
530
}
689
531
690
/* Strip permissions down to nobody */
532
ret = setuid(uid);
533
if (ret == -1){
534
perror("setuid");
535
}
536
691
537
setgid(gid);
692
if(ret == -1){
538
if (ret == -1){
693
539
perror("setgid");
694
540
}
695
ret = setuid(uid);
696
if(ret == -1){
697
perror("setuid");
698
}
699
700
if(plugindir == NULL){
701
dir = opendir(PDIR);
702
} else {
703
dir = opendir(plugindir);
704
}
705
541
542
dir = opendir(plugindir);
706
543
if(dir == NULL){
707
544
perror("Could not open plugin dir");
708
545
exitstatus = EXIT_FAILURE;
724
561
725
562
FD_ZERO(&rfds_all);
726
563
727
/* Read and execute any executable in the plugin directory*/
728
564
while(true){
729
do {
730
dirst = readdir(dir);
731
} while(dirst == NULL and errno == EINTR);
565
dirst = readdir(dir);
732
566
733
/* All directory entries have been processed */
567
// All directory entries have been processed
734
568
if(dirst == NULL){
735
if(errno == EBADF){
569
if (errno == EBADF){
736
570
perror("readdir");
737
571
exitstatus = EXIT_FAILURE;
738
572
goto fallback;
742
576
743
577
d_name_len = strlen(dirst->d_name);
744
578
745
/* Ignore dotfiles, backup files and other junk */
579
// Ignore dotfiles, backup files and other junk
746
580
{
747
581
bool bad_name = false;
748
582
750
584
751
585
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
752
586
".dpkg-old",
753
".dpkg-bak",
754
587
".dpkg-divert", NULL };
755
588
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
756
589
size_t pre_len = strlen(*pre);
764
597
break;
765
598
}
766
599
}
600
767
601
if(bad_name){
768
602
continue;
769
603
}
604
770
605
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
771
606
size_t suf_len = strlen(*suf);
772
607
if((d_name_len >= suf_len)
785
620
continue;
786
621
}
787
622
}
788
623
789
624
char *filename;
790
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
792
dirst->d_name));
793
} else {
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
795
dirst->d_name));
796
}
625
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
797
626
if(ret < 0){
798
627
perror("asprintf");
799
628
continue;
800
629
}
801
630
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
803
if(ret == -1){
631
ret = stat(filename, &st);
632
if (ret == -1){
804
633
perror("stat");
805
634
free(filename);
806
635
continue;
807
636
}
808
637
809
/* Ignore non-executable files */
810
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
638
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
812
639
if(debug){
813
640
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
814
641
" with bad type or mode\n", filename);
816
643
free(filename);
817
644
continue;
818
645
}
819
820
plugin *p = getplugin(dirst->d_name);
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
821
647
if(p == NULL){
822
648
perror("getplugin");
823
649
free(filename);
833
659
}
834
660
{
835
661
/* Add global arguments to argument list for this plugin */
836
plugin *g = getplugin(NULL);
662
plugin *g = getplugin(NULL, &plugin_list);
837
663
if(g != NULL){
838
664
for(char **a = g->argv + 1; *a != NULL; a++){
839
665
if(not add_argument(p, *a)){
842
668
}
843
669
/* Add global environment variables */
844
670
for(char **e = g->environ; *e != NULL; e++){
845
if(not add_environment(p, *e, false)){
671
if(not add_environment(p, *e)){
846
672
perror("add_environment");
847
673
}
848
674
}
853
679
process, too. */
854
680
if(p->environ[0] != NULL){
855
681
for(char **e = environ; *e != NULL; e++){
856
if(not add_environment(p, *e, false)){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
857
688
perror("add_environment");
858
689
}
859
690
}
860
691
}
861
692
862
693
int pipefd[2];
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
864
if(ret == -1){
694
ret = pipe(pipefd);
695
if (ret == -1){
865
696
perror("pipe");
866
697
exitstatus = EXIT_FAILURE;
867
698
goto fallback;
868
699
}
869
/* Ask OS to automatic close the pipe on exec */
870
700
ret = set_cloexec_flag(pipefd[0]);
871
701
if(ret < 0){
872
702
perror("set_cloexec_flag");
880
710
goto fallback;
881
711
}
882
712
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
885
NULL));
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
886
714
if(ret < 0){
887
715
perror("sigprocmask");
888
716
exitstatus = EXIT_FAILURE;
889
717
goto fallback;
890
718
}
891
/* Starting a new process to be watched */
892
pid_t pid;
893
do {
894
pid = fork();
895
} while(pid == -1 and errno == EINTR);
719
// Starting a new process to be watched
720
pid_t pid = fork();
896
721
if(pid == -1){
897
722
perror("fork");
898
723
exitstatus = EXIT_FAILURE;
905
730
perror("sigaction");
906
731
_exit(EXIT_FAILURE);
907
732
}
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
734
if(ret < 0){
910
735
perror("sigprocmask");
911
736
_exit(EXIT_FAILURE);
912
737
}
913
738
914
739
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
915
740
if(ret == -1){
916
741
perror("dup2");
935
760
}
936
761
/* no return */
937
762
}
938
/* Parent process */
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
940
pipe */
763
/* parent process */
941
764
free(filename);
942
plugin *new_plugin = getplugin(dirst->d_name);
943
if(new_plugin == NULL){
944
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
947
NULL));
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);
948
770
if(ret < 0){
949
perror("sigprocmask");
771
perror("sigprocmask");
950
772
}
951
773
exitstatus = EXIT_FAILURE;
952
774
goto fallback;
953
775
}
954
776
955
new_plugin->pid = pid;
956
new_plugin->fd = pipefd[0];
957
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
958
782
/* Unblock SIGCHLD so signal handler can be run if this process
959
783
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
963
785
if(ret < 0){
964
786
perror("sigprocmask");
965
787
exitstatus = EXIT_FAILURE;
966
788
goto fallback;
967
789
}
968
790
969
FD_SET(new_plugin->fd, &rfds_all);
791
FD_SET(new_process->fd, &rfds_all);
970
792
971
if(maxfd < new_plugin->fd){
972
maxfd = new_plugin->fd;
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
973
795
}
796
974
797
}
975
798
976
TEMP_FAILURE_RETRY(closedir(dir));
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
closedir(dir);
977
803
dir = NULL;
978
free_plugin(getplugin(NULL));
979
980
for(plugin *p = plugin_list; p != NULL; p = p->next){
981
if(p->pid != 0){
982
break;
983
}
984
if(p->next == NULL){
985
fprintf(stderr, "No plugin processes started. Incorrect plugin"
986
" directory?\n");
987
free_plugin_list();
988
}
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
process_list = NULL;
989
809
}
990
991
/* Main loop while running plugins exist */
992
while(plugin_list){
810
while(process_list){
993
811
fd_set rfds = rfds_all;
994
812
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
if(select_ret == -1 and errno != EINTR){
813
if (select_ret == -1){
996
814
perror("select");
997
815
exitstatus = EXIT_FAILURE;
998
816
goto fallback;
999
817
}
1000
818
/* OK, now either a process completed, or something can be read
1001
819
from one of them */
1002
for(plugin *proc = plugin_list; proc != NULL;){
820
for(process *proc = process_list; proc ; proc = proc->next){
1003
821
/* Is this process completely done? */
1004
if(proc->completed and proc->eof){
822
if(proc->eof and proc->completed){
1005
823
/* Only accept the plugin output if it exited cleanly */
1006
824
if(not WIFEXITED(proc->status)
1007
825
or WEXITSTATUS(proc->status) != 0){
1008
826
/* Bad exit by plugin */
1009
1010
827
if(debug){
1011
828
if(WIFEXITED(proc->status)){
1012
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1013
" status %d\n", proc->name,
1014
(intmax_t) (proc->pid),
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
1015
831
WEXITSTATUS(proc->status));
1016
} else if(WIFSIGNALED(proc->status)){
1017
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1018
" signal %d: %s\n", proc->name,
1019
(intmax_t) (proc->pid),
1020
WTERMSIG(proc->status),
1021
strsignal(WTERMSIG(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));
1022
836
} else if(WCOREDUMP(proc->status)){
1023
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
" core\n", proc->name, (intmax_t) (proc->pid));
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
1025
839
}
1026
840
}
1027
1028
841
/* Remove the plugin */
1029
842
FD_CLR(proc->fd, &rfds_all);
1030
1031
843
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1034
NULL));
844
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1035
845
if(ret < 0){
1036
846
perror("sigprocmask");
1037
847
exitstatus = EXIT_FAILURE;
1038
848
goto fallback;
1039
849
}
1040
1041
plugin *next_plugin = proc->next;
1042
free_plugin(proc);
1043
proc = next_plugin;
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
863
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1048
NULL));
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
1049
866
if(ret < 0){
1050
867
perror("sigprocmask");
1051
exitstatus = EXIT_FAILURE;
1052
goto fallback;
1053
}
1054
1055
if(plugin_list == NULL){
1056
break;
1057
}
1058
1059
continue;
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;
1060
875
}
1061
1062
876
/* This process exited nicely, so print its buffer */
1063
877
1064
878
bool bret = print_out_password(proc->buffer,
1065
879
proc->buffer_length);
1066
880
if(not bret){
1069
883
}
1070
884
goto fallback;
1071
885
}
1072
1073
886
/* This process has not completed. Does it have any output? */
1074
887
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1075
888
/* This process had nothing to say at this time */
1076
proc = proc->next;
1077
889
continue;
1078
890
}
1079
891
/* Before reading, make the process' data buffer large enough */
1080
892
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1081
893
proc->buffer = realloc(proc->buffer, proc->buffer_size
1082
894
+ (size_t) BUFFER_SIZE);
1083
if(proc->buffer == NULL){
895
if (proc->buffer == NULL){
1084
896
perror("malloc");
1085
897
exitstatus = EXIT_FAILURE;
1086
898
goto fallback;
1088
900
proc->buffer_size += BUFFER_SIZE;
1089
901
}
1090
902
/* Read from the process */
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1092
proc->buffer
1093
+ proc->buffer_length,
1094
BUFFER_SIZE));
1095
if(sret < 0){
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1096
906
/* Read error from this process; ignore the error */
1097
proc = proc->next;
1098
907
continue;
1099
908
}
1100
if(sret == 0){
909
if(ret == 0){
1101
910
/* got EOF */
1102
911
proc->eof = true;
1103
912
} else {
1104
proc->buffer_length += (size_t) sret;
913
proc->buffer_length += (size_t) ret;
1105
914
}
1106
915
}
1107
916
}
1108
1109
917
918
1110
919
fallback:
1111
920
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1113
922
/* Fallback if all plugins failed, none are found or an error
1114
923
occured */
1115
924
bool bret;
1116
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1117
926
char *passwordbuffer = getpass("Password: ");
1118
size_t len = strlen(passwordbuffer);
1119
/* Strip trailing newline */
1120
if(len > 0 and passwordbuffer[len-1] == '\n'){
1121
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1122
len--;
1123
}
1124
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1125
928
if(not bret){
1126
929
perror("print_out_password");
1127
930
exitstatus = EXIT_FAILURE;
1134
937
perror("sigaction");
1135
938
exitstatus = EXIT_FAILURE;
1136
939
}
1137
940
1138
941
if(custom_argv != NULL){
1139
942
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1140
943
free(*arg);
1141
944
}
1142
945
free(custom_argv);
1143
946
}
947
free_plugin_list(plugin_list);
1144
948
1145
949
if(dir != NULL){
1146
950
closedir(dir);
1147
951
}
1148
952
1149
/* Kill the processes */
1150
for(plugin *p = plugin_list; p != NULL; p = p->next){
1151
if(p->pid != 0){
1152
close(p->fd);
1153
ret = kill(p->pid, SIGTERM);
1154
if(ret == -1 and errno != ESRCH){
1155
/* Set-uid proccesses might not get closed */
1156
perror("kill");
1157
}
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");
1158
961
}
962
free(process_list->buffer);
963
free(process_list);
1159
964
}
1160
965
1161
966
/* Wait for any remaining child processes to terminate */
1162
do {
967
do{
1163
968
ret = wait(NULL);
1164
969
} while(ret >= 0);
1165
970
if(errno != ECHILD){
1166
971
perror("wait");
1167
972
}
1168
973
1169
free_plugin_list();
1170
1171
free(plugindir);
1172
free(argfile);
1173
1174
974
return exitstatus;
1175
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0