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- Committer: Teddy Hogeborn
- Date: 2009-10-25 19:16:56 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 419.
- Revision ID: teddy@fukt.bsnet.se-20091025191656-zc9xzphyanlr88hq
Tags: version-1.0.14-1
* Makefile (version): Changed to "1.0.14".
* NEWS (Version 1.0.14): New entry.
* debian/changelog (1.0.14-1): - '' -
* NEWS (Version 1.0.14): New entry.
* debian/changelog (1.0.14-1): - '' -
- 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
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
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
}
256
315
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
316
}
317
318
free(plugin_node);
270
319
}
271
320
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
284
324
}
285
325
}
286
326
287
327
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
328
char *plugindir = NULL;
329
char *argfile = NULL;
290
330
FILE *conffp;
291
331
size_t d_name_len;
292
332
DIR *dir = NULL;
294
334
struct stat st;
295
335
fd_set rfds_all;
296
336
int ret, maxfd = 0;
337
ssize_t sret;
297
338
uid_t uid = 65534;
298
339
gid_t gid = 65534;
299
340
bool debug = false;
324
365
{ .name = "global-options", .key = 'g',
325
366
.arg = "OPTION[,OPTION[,...]]",
326
367
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
368
{ .name = "global-env", .key = 'G',
328
369
.arg = "VAR=value",
329
370
.doc = "Environment variable passed to all plugins" },
330
371
{ .name = "options-for", .key = 'o',
331
372
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
373
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
374
{ .name = "env-for", .key = 'E',
334
375
.arg = "PLUGIN:ENV=value",
335
376
.doc = "Environment variable passed to specified plugin" },
336
377
{ .name = "disable", .key = 'd',
337
378
.arg = "PLUGIN",
338
379
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
339
383
{ .name = "plugin-dir", .key = 128,
340
384
.arg = "DIRECTORY",
341
385
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.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 },
350
397
{ .name = NULL }
351
398
};
352
399
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
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'){
363
410
continue;
364
411
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
412
if(not add_argument(getplugin(NULL), plugin_option)){
366
413
perror("add_argument");
367
414
return ARGP_ERR_UNKNOWN;
368
415
}
369
416
}
370
417
}
371
418
break;
372
case 'e':
419
case 'G': /* --global-env */
373
420
if(arg == NULL){
374
421
break;
375
422
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
384
425
}
385
426
break;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
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;
406
438
}
407
439
}
408
440
}
409
441
break;
410
case 'f':
442
case 'E': /* --env-for */
411
443
if(arg == NULL){
412
444
break;
413
445
}
416
448
if(envdef == NULL){
417
449
break;
418
450
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
425
453
perror("add_environment");
426
454
}
427
455
}
428
456
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
432
460
if(p == NULL){
433
461
return ARGP_ERR_UNKNOWN;
434
462
}
435
463
p->disabled = true;
436
464
}
437
465
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
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 */
448
508
debug = true;
449
509
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.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 = "",
465
566
.doc = "Mandos plugin runner -- Run plugins" };
466
567
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
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){
469
572
fprintf(stderr, "Unknown error while parsing arguments\n");
470
573
exitstatus = EXIT_FAILURE;
471
574
goto fallback;
472
575
}
473
474
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
}
475
586
if(conffp != NULL){
476
587
char *org_line = NULL;
477
588
char *p, *arg, *new_arg, *line;
478
589
size_t size = 0;
479
ssize_t sret;
480
590
const char whitespace_delims[] = " \r\t\f\v\n";
481
591
const char comment_delim[] = "#";
482
592
593
custom_argc = 1;
594
custom_argv = malloc(sizeof(char*) * 2);
595
if(custom_argv == NULL){
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
custom_argv[0] = argv[0];
601
custom_argv[1] = NULL;
602
603
/* for each line in the config file, strip whitespace and ignore
604
commented text */
483
605
while(true){
484
606
sret = getline(&org_line, &size, conffp);
485
607
if(sret == -1){
486
608
break;
487
609
}
488
610
489
611
line = org_line;
490
612
arg = strsep(&line, comment_delim);
491
613
while((p = strsep(&arg, whitespace_delims)) != NULL){
493
615
continue;
494
616
}
495
617
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
618
if(new_arg == NULL){
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
621
free(org_line);
622
goto fallback;
623
}
624
625
custom_argc += 1;
626
custom_argv = realloc(custom_argv, sizeof(char *)
627
* ((unsigned int) custom_argc + 1));
628
if(custom_argv == NULL){
629
perror("realloc");
630
exitstatus = EXIT_FAILURE;
631
free(org_line);
632
goto fallback;
633
}
634
custom_argv[custom_argc-1] = new_arg;
635
custom_argv[custom_argc] = NULL;
502
636
}
503
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
}
504
646
free(org_line);
505
} else{
647
} else {
506
648
/* Check for harmful errors and go to fallback. Other errors might
507
649
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
651
perror("fopen");
510
652
exitstatus = EXIT_FAILURE;
511
653
goto fallback;
512
654
}
513
655
}
514
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
515
658
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
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){
520
662
fprintf(stderr, "Unknown error while parsing arguments\n");
521
663
exitstatus = EXIT_FAILURE;
522
664
goto fallback;
523
665
}
524
666
}
525
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
526
677
if(debug){
527
678
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
679
fprintf(stderr, "Plugin: %s has %d arguments\n",
530
681
for(char **a = p->argv; *a != NULL; a++){
531
682
fprintf(stderr, "\tArg: %s\n", *a);
532
683
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
534
685
for(char **a = p->environ; *a != NULL; a++){
535
686
fprintf(stderr, "\t%s\n", *a);
536
687
}
537
688
}
538
689
}
539
690
691
/* Strip permissions down to nobody */
692
setgid(gid);
693
if(ret == -1){
694
perror("setgid");
695
}
540
696
ret = setuid(uid);
541
if (ret == -1){
697
if(ret == -1){
542
698
perror("setuid");
543
699
}
544
700
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
701
if(plugindir == NULL){
702
dir = opendir(PDIR);
703
} else {
704
dir = opendir(plugindir);
548
705
}
549
706
550
dir = opendir(plugindir);
551
707
if(dir == NULL){
552
708
perror("Could not open plugin dir");
553
709
exitstatus = EXIT_FAILURE;
569
725
570
726
FD_ZERO(&rfds_all);
571
727
728
/* Read and execute any executable in the plugin directory*/
572
729
while(true){
573
dirst = readdir(dir);
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
574
733
575
// All directory entries have been processed
734
/* All directory entries have been processed */
576
735
if(dirst == NULL){
577
if (errno == EBADF){
736
if(errno == EBADF){
578
737
perror("readdir");
579
738
exitstatus = EXIT_FAILURE;
580
739
goto fallback;
584
743
585
744
d_name_len = strlen(dirst->d_name);
586
745
587
// Ignore dotfiles, backup files and other junk
746
/* Ignore dotfiles, backup files and other junk */
588
747
{
589
748
bool bad_name = false;
590
749
592
751
593
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
594
753
".dpkg-old",
754
".dpkg-bak",
595
755
".dpkg-divert", NULL };
596
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
597
757
size_t pre_len = strlen(*pre);
605
765
break;
606
766
}
607
767
}
608
609
768
if(bad_name){
610
769
continue;
611
770
}
612
613
771
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
614
772
size_t suf_len = strlen(*suf);
615
773
if((d_name_len >= suf_len)
628
786
continue;
629
787
}
630
788
}
631
789
632
790
char *filename;
633
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
}
634
799
if(ret < 0){
635
800
perror("asprintf");
636
801
continue;
637
802
}
638
803
639
ret = stat(filename, &st);
640
if (ret == -1){
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
641
806
perror("stat");
642
807
free(filename);
643
808
continue;
644
809
}
645
810
646
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)){
647
814
if(debug){
648
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
816
" with bad type or mode\n", filename);
651
818
free(filename);
652
819
continue;
653
820
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
821
822
plugin *p = getplugin(dirst->d_name);
655
823
if(p == NULL){
656
824
perror("getplugin");
657
825
free(filename);
667
835
}
668
836
{
669
837
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
838
plugin *g = getplugin(NULL);
671
839
if(g != NULL){
672
840
for(char **a = g->argv + 1; *a != NULL; a++){
673
841
if(not add_argument(p, *a)){
676
844
}
677
845
/* Add global environment variables */
678
846
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
847
if(not add_environment(p, *e, false)){
680
848
perror("add_environment");
681
849
}
682
850
}
687
855
process, too. */
688
856
if(p->environ[0] != NULL){
689
857
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
858
if(not add_environment(p, *e, false)){
696
859
perror("add_environment");
697
860
}
698
861
}
699
862
}
700
863
701
864
int pipefd[2];
702
ret = pipe(pipefd);
703
if (ret == -1){
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
704
867
perror("pipe");
705
868
exitstatus = EXIT_FAILURE;
706
869
goto fallback;
707
870
}
871
/* Ask OS to automatic close the pipe on exec */
708
872
ret = set_cloexec_flag(pipefd[0]);
709
873
if(ret < 0){
710
874
perror("set_cloexec_flag");
718
882
goto fallback;
719
883
}
720
884
/* Block SIGCHLD until process is safely in process list */
721
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));
722
888
if(ret < 0){
723
889
perror("sigprocmask");
724
890
exitstatus = EXIT_FAILURE;
725
891
goto fallback;
726
892
}
727
// Starting a new process to be watched
728
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);
729
898
if(pid == -1){
730
899
perror("fork");
731
900
exitstatus = EXIT_FAILURE;
738
907
perror("sigaction");
739
908
_exit(EXIT_FAILURE);
740
909
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
911
if(ret < 0){
743
912
perror("sigprocmask");
744
913
_exit(EXIT_FAILURE);
745
914
}
746
915
747
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
917
if(ret == -1){
749
918
perror("dup2");
768
937
}
769
938
/* no return */
770
939
}
771
/* parent process */
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
772
943
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
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)));
778
950
if(ret < 0){
779
perror("sigprocmask");
951
perror("sigprocmask");
780
952
}
781
953
exitstatus = EXIT_FAILURE;
782
954
goto fallback;
783
955
}
784
956
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
790
960
/* Unblock SIGCHLD so signal handler can be run if this process
791
961
has already completed */
792
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));
793
965
if(ret < 0){
794
966
perror("sigprocmask");
795
967
exitstatus = EXIT_FAILURE;
796
968
goto fallback;
797
969
}
798
970
799
FD_SET(new_process->fd, &rfds_all);
971
FD_SET(new_plugin->fd, &rfds_all);
800
972
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
973
if(maxfd < new_plugin->fd){
974
maxfd = new_plugin->fd;
803
975
}
804
805
976
}
806
977
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
closedir(dir);
978
TEMP_FAILURE_RETRY(closedir(dir));
811
979
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
980
free_plugin(getplugin(NULL));
981
982
for(plugin *p = plugin_list; p != NULL; p = p->next){
983
if(p->pid != 0){
984
break;
985
}
986
if(p->next == NULL){
987
fprintf(stderr, "No plugin processes started. Incorrect plugin"
988
" directory?\n");
989
free_plugin_list();
990
}
817
991
}
818
while(process_list){
992
993
/* Main loop while running plugins exist */
994
while(plugin_list){
819
995
fd_set rfds = rfds_all;
820
996
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
997
if(select_ret == -1 and errno != EINTR){
822
998
perror("select");
823
999
exitstatus = EXIT_FAILURE;
824
1000
goto fallback;
825
1001
}
826
1002
/* OK, now either a process completed, or something can be read
827
1003
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
1004
for(plugin *proc = plugin_list; proc != NULL;){
829
1005
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
1006
if(proc->completed and proc->eof){
831
1007
/* Only accept the plugin output if it exited cleanly */
832
1008
if(not WIFEXITED(proc->status)
833
1009
or WEXITSTATUS(proc->status) != 0){
834
1010
/* Bad exit by plugin */
1011
835
1012
if(debug){
836
1013
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
839
1017
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
strsignal(WTERMSIG(proc->status)));
844
1024
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
847
1027
}
848
1028
}
1029
849
1030
/* Remove the plugin */
850
1031
FD_CLR(proc->fd, &rfds_all);
1032
851
1033
/* Block signal while modifying process_list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1035
(SIG_BLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
853
1038
if(ret < 0){
854
1039
perror("sigprocmask");
855
1040
exitstatus = EXIT_FAILURE;
856
1041
goto fallback;
857
1042
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
1043
1044
plugin *next_plugin = proc->next;
1045
free_plugin(proc);
1046
proc = next_plugin;
1047
871
1048
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
874
1052
if(ret < 0){
875
1053
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1054
exitstatus = EXIT_FAILURE;
1055
goto fallback;
1056
}
1057
1058
if(plugin_list == NULL){
1059
break;
1060
}
1061
1062
continue;
883
1063
}
1064
884
1065
/* This process exited nicely, so print its buffer */
885
1066
886
1067
bool bret = print_out_password(proc->buffer,
887
1068
proc->buffer_length);
888
1069
if(not bret){
891
1072
}
892
1073
goto fallback;
893
1074
}
1075
894
1076
/* This process has not completed. Does it have any output? */
895
1077
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
1078
/* This process had nothing to say at this time */
1079
proc = proc->next;
897
1080
continue;
898
1081
}
899
1082
/* Before reading, make the process' data buffer large enough */
900
1083
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
1084
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
1085
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
1086
if(proc->buffer == NULL){
904
1087
perror("malloc");
905
1088
exitstatus = EXIT_FAILURE;
906
1089
goto fallback;
908
1091
proc->buffer_size += BUFFER_SIZE;
909
1092
}
910
1093
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1095
proc->buffer
1096
+ proc->buffer_length,
1097
BUFFER_SIZE));
1098
if(sret < 0){
914
1099
/* Read error from this process; ignore the error */
1100
proc = proc->next;
915
1101
continue;
916
1102
}
917
if(ret == 0){
1103
if(sret == 0){
918
1104
/* got EOF */
919
1105
proc->eof = true;
920
1106
} else {
921
proc->buffer_length += (size_t) ret;
1107
proc->buffer_length += (size_t) sret;
922
1108
}
923
1109
}
924
1110
}
925
926
1111
1112
927
1113
fallback:
928
1114
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
930
1116
/* Fallback if all plugins failed, none are found or an error
931
1117
occured */
932
1118
bool bret;
933
1119
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1120
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1121
size_t len = strlen(passwordbuffer);
1122
/* Strip trailing newline */
1123
if(len > 0 and passwordbuffer[len-1] == '\n'){
1124
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1125
len--;
1126
}
1127
bret = print_out_password(passwordbuffer, len);
936
1128
if(not bret){
937
1129
perror("print_out_password");
938
1130
exitstatus = EXIT_FAILURE;
945
1137
perror("sigaction");
946
1138
exitstatus = EXIT_FAILURE;
947
1139
}
948
1140
949
1141
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1142
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1143
free(*arg);
952
1144
}
953
1145
free(custom_argv);
954
1146
}
955
free_plugin_list(plugin_list);
956
1147
957
1148
if(dir != NULL){
958
1149
closedir(dir);
959
1150
}
960
1151
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1152
/* Kill the processes */
1153
for(plugin *p = plugin_list; p != NULL; p = p->next){
1154
if(p->pid != 0){
1155
close(p->fd);
1156
ret = kill(p->pid, SIGTERM);
1157
if(ret == -1 and errno != ESRCH){
1158
/* Set-uid proccesses might not get closed */
1159
perror("kill");
1160
}
969
1161
}
970
free(process_list->buffer);
971
free(process_list);
972
1162
}
973
1163
974
1164
/* Wait for any remaining child processes to terminate */
975
do{
1165
do {
976
1166
ret = wait(NULL);
977
1167
} while(ret >= 0);
978
1168
if(errno != ECHILD){
979
1169
perror("wait");
980
1170
}
981
1171
1172
free_plugin_list();
1173
1174
free(plugindir);
1175
free(argfile);
1176
982
1177
return exitstatus;
983
1178
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0