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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:20:46 UTC
- mto: (24.1.140 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 264.
- Revision ID: teddy@fukt.bsnet.se-20090905172046-s92efz3m1j4c1sti
* plugins-runner.c (main): Bug fix: Close config file.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- 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
21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
27
#include <stddef.h> /* size_t, NULL */
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> /* strtok, strlen(), strcpy(),
55
strcat() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
59
61
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
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
73
69
const char *argp_program_version = "mandos-client 1.0";
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;
70
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
79
72
struct process;
73
74
typedef struct process{
80
typedef struct plugin{
81
char *name; /* can be NULL or any plugin name */
82
char **argv;
83
int argc;
84
char **environ;
85
int envc;
86
bool disabled;
87
88
/* Variables used for running processes*/
75
89
pid_t pid;
76
90
int fd;
77
91
char *buffer;
78
92
size_t buffer_size;
79
93
size_t buffer_length;
80
94
bool eof;
81
bool completed;
95
volatile sig_atomic_t completed;
82
96
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
91
97
struct plugin *next;
92
98
} plugin;
93
99
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
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))){
98
109
return p;
99
110
}
100
111
}
101
112
/* Create a new plugin */
102
113
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
114
if(new_plugin == NULL){
115
return NULL;
116
}
117
char *copy_name = NULL;
118
if(name != NULL){
119
copy_name = strdup(name);
120
if(copy_name == NULL){
121
free(new_plugin);
122
return NULL;
123
}
124
}
125
126
*new_plugin = (plugin){ .name = copy_name,
127
.argc = 1,
128
.disabled = false,
129
.next = plugin_list };
130
108
131
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
132
if(new_plugin->argv == NULL){
133
free(copy_name);
134
free(new_plugin);
135
return NULL;
112
136
}
113
new_plugin->argv[0] = name;
137
new_plugin->argv[0] = copy_name;
114
138
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
139
140
new_plugin->environ = malloc(sizeof(char *));
141
if(new_plugin->environ == NULL){
142
free(copy_name);
143
free(new_plugin->argv);
144
free(new_plugin);
145
return NULL;
146
}
147
new_plugin->environ[0] = NULL;
148
118
149
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
150
plugin_list = new_plugin;
120
151
return new_plugin;
121
152
}
122
153
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
154
/* Helper function for add_argument and add_environment */
155
static bool add_to_char_array(const char *new, char ***array,
156
int *len){
157
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
160
/* Malloc check */
161
if(*array == NULL){
162
return false;
163
}
164
/* Make a copy of the new string */
165
char *copy = strdup(new);
166
if(copy == NULL){
167
return false;
168
}
169
/* Insert the copy */
170
(*array)[*len] = copy;
171
(*len)++;
172
/* Add a new terminating NULL pointer to the last element */
173
(*array)[*len] = NULL;
174
return true;
175
}
176
177
/* Add to a plugin's argument vector */
178
static bool add_argument(plugin *p, const char *arg){
179
if(p == NULL){
180
return false;
181
}
182
return add_to_char_array(arg, &(p->argv), &(p->argc));
183
}
184
185
/* Add to a plugin's environment */
186
static bool add_environment(plugin *p, const char *def, bool replace){
187
if(p == NULL){
188
return false;
189
}
190
/* namelen = length of name of environment variable */
191
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
195
/* It already exists */
196
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
199
return false;
200
}
201
*e = new;
202
strcpy(*e, def);
203
}
204
return true;
205
}
206
}
207
return add_to_char_array(def, &(p->environ), &(p->envc));
132
208
}
133
209
134
210
/*
135
211
* Based on the example in the GNU LibC manual chapter 13.13 "File
136
212
* Descriptor Flags".
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
213
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
138
214
*/
139
static int set_cloexec_flag(int fd)
140
{
215
static int set_cloexec_flag(int fd){
141
216
int ret = fcntl(fd, F_GETFD, 0);
142
217
/* If reading the flags failed, return error indication now. */
143
218
if(ret < 0){
147
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
223
}
149
224
150
process *process_list = NULL;
151
225
152
/* Mark a process as completed when it exits, and save its exit
226
/* Mark processes as completed when they exit, and save their exit
153
227
status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
228
static void handle_sigchld(__attribute__((unused)) int sig){
229
int old_errno = errno;
230
while(true){
231
plugin *proc = plugin_list;
232
int status;
233
pid_t pid = waitpid(-1, &status, WNOHANG);
234
if(pid == 0){
235
/* Only still running child processes */
236
break;
237
}
238
if(pid == -1){
239
if(errno == ECHILD){
240
/* No child processes */
241
break;
242
}
243
perror("waitpid");
244
}
245
246
/* A child exited, find it in process_list */
247
while(proc != NULL and proc->pid != pid){
248
proc = proc->next;
249
}
250
if(proc == NULL){
251
/* Process not found in process list */
252
continue;
253
}
254
proc->status = status;
255
proc->completed = 1;
256
}
257
errno = old_errno;
171
258
}
172
259
173
bool print_out_password(const char *buffer, size_t length){
260
/* Prints out a password to stdout */
261
static bool print_out_password(const char *buffer, size_t length){
174
262
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
263
for(size_t written = 0; written < length; written += (size_t)ret){
179
264
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
265
length - written));
185
270
return true;
186
271
}
187
272
273
/* Removes and free a plugin from the plugin list */
274
static void free_plugin(plugin *plugin_node){
275
276
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(*arg);
278
}
279
free(plugin_node->argv);
280
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(*env);
282
}
283
free(plugin_node->environ);
284
free(plugin_node->buffer);
285
286
/* Removes the plugin from the singly-linked list */
287
if(plugin_node == plugin_list){
288
/* First one - simple */
289
plugin_list = plugin_list->next;
290
} else {
291
/* Second one or later */
292
for(plugin *p = plugin_list; p != NULL; p = p->next){
293
if(p->next == plugin_node){
294
p->next = plugin_node->next;
295
break;
296
}
297
}
298
}
299
300
free(plugin_node);
301
}
302
303
static void free_plugin_list(void){
304
while(plugin_list != NULL){
305
free_plugin(plugin_list);
306
}
307
}
308
188
309
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
310
char *plugindir = NULL;
311
char *argfile = NULL;
312
FILE *conffp;
190
313
size_t d_name_len;
191
314
DIR *dir = NULL;
192
315
struct dirent *dirst;
193
316
struct stat st;
194
317
fd_set rfds_all;
195
318
int ret, maxfd = 0;
319
ssize_t sret;
320
intmax_t tmpmax;
196
321
uid_t uid = 65534;
197
322
gid_t gid = 65534;
198
323
bool debug = false;
200
325
struct sigaction old_sigchld_action;
201
326
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
327
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
328
char **custom_argv = NULL;
329
int custom_argc = 0;
330
206
331
/* Establish a signal handler */
207
332
sigemptyset(&sigchld_action.sa_mask);
208
333
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
334
if(ret == -1){
210
335
perror("sigaddset");
211
exit(EXIT_FAILURE);
336
exitstatus = EXIT_FAILURE;
337
goto fallback;
212
338
}
213
339
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
340
if(ret == -1){
215
341
perror("sigaction");
216
exit(EXIT_FAILURE);
342
exitstatus = EXIT_FAILURE;
343
goto fallback;
217
344
}
218
345
219
346
/* The options we understand. */
221
348
{ .name = "global-options", .key = 'g',
222
349
.arg = "OPTION[,OPTION[,...]]",
223
350
.doc = "Options passed to all plugins" },
351
{ .name = "global-env", .key = 'G',
352
.arg = "VAR=value",
353
.doc = "Environment variable passed to all plugins" },
224
354
{ .name = "options-for", .key = 'o',
225
355
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
356
.doc = "Options passed only to specified plugin" },
357
{ .name = "env-for", .key = 'E',
358
.arg = "PLUGIN:ENV=value",
359
.doc = "Environment variable passed to specified plugin" },
227
360
{ .name = "disable", .key = 'd',
228
361
.arg = "PLUGIN",
229
362
.doc = "Disable a specific plugin", .group = 1 },
363
{ .name = "enable", .key = 'e',
364
.arg = "PLUGIN",
365
.doc = "Enable a specific plugin", .group = 1 },
230
366
{ .name = "plugin-dir", .key = 128,
231
367
.arg = "DIRECTORY",
232
368
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
369
{ .name = "config-file", .key = 129,
370
.arg = "FILE",
371
.doc = "Specify a different configuration file", .group = 2 },
372
{ .name = "userid", .key = 130,
373
.arg = "ID", .flags = 0,
374
.doc = "User ID the plugins will run as", .group = 3 },
375
{ .name = "groupid", .key = 131,
376
.arg = "ID", .flags = 0,
377
.doc = "Group ID the plugins will run as", .group = 3 },
378
{ .name = "debug", .key = 132,
379
.doc = "Debug mode", .group = 4 },
241
380
{ .name = NULL }
242
381
};
243
382
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
280
uid = (uid_t)strtol(arg, NULL, 10);
281
break;
282
case 130:
283
gid = (gid_t)strtol(arg, NULL, 10);
284
break;
285
case 131:
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
386
switch(key){
387
case 'g': /* --global-options */
388
if(arg != NULL){
389
char *plugin_option;
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
394
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
397
}
398
}
399
}
400
break;
401
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
408
break;
409
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
break;
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
{
429
char *envdef = strchr(arg, ':');
430
if(envdef == NULL){
431
break;
432
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
436
}
437
}
438
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
444
}
445
p->disabled = true;
446
}
447
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
470
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
481
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
487
}
488
break;
489
case 132: /* --debug */
286
490
debug = true;
287
491
break;
288
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
492
/*
493
* When adding more options before this line, remember to also add a
494
* "case" to the "parse_opt_config_file" function below.
495
*/
496
case ARGP_KEY_ARG:
497
/* Cryptsetup always passes an argument, which is an empty
498
string if "none" was specified in /etc/crypttab. So if
499
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
default:
507
return ARGP_ERR_UNKNOWN;
508
}
509
return 0;
510
}
511
512
/* This option parser is the same as parse_opt() above, except it
513
ignores everything but the --config-file option. */
514
error_t parse_opt_config_file(int key, char *arg,
515
__attribute__((unused))
516
struct argp_state *state){
517
switch(key){
518
case 'g': /* --global-options */
519
case 'G': /* --global-env */
520
case 'o': /* --options-for */
521
case 'E': /* --env-for */
522
case 'd': /* --disable */
523
case 'e': /* --enable */
524
case 128: /* --plugin-dir */
525
break;
526
case 129: /* --config-file */
527
free(argfile);
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
break;
533
case 130: /* --userid */
534
case 131: /* --groupid */
535
case 132: /* --debug */
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
break;
539
default:
540
return ARGP_ERR_UNKNOWN;
541
}
542
return 0;
543
}
544
545
struct argp argp = { .options = options,
546
.parser = parse_opt_config_file,
547
.args_doc = "",
306
548
.doc = "Mandos plugin runner -- Run plugins" };
307
549
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
if (ret == ARGP_ERR_UNKNOWN){
550
/* Parse using parse_opt_config_file() in order to get the custom
551
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
310
554
fprintf(stderr, "Unknown error while parsing arguments\n");
311
555
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
556
goto fallback;
557
}
558
559
/* Reset to the normal argument parser */
560
argp.parser = parse_opt;
561
562
/* Open the configfile if available */
563
if(argfile == NULL){
564
conffp = fopen(AFILE, "r");
565
} else {
566
conffp = fopen(argfile, "r");
567
}
568
if(conffp != NULL){
569
char *org_line = NULL;
570
char *p, *arg, *new_arg, *line;
571
size_t size = 0;
572
const char whitespace_delims[] = " \r\t\f\v\n";
573
const char comment_delim[] = "#";
574
575
custom_argc = 1;
576
custom_argv = malloc(sizeof(char*) * 2);
577
if(custom_argv == NULL){
325
578
perror("malloc");
326
579
exitstatus = EXIT_FAILURE;
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
346
if (ret == ARGP_ERR_UNKNOWN){
580
goto fallback;
581
}
582
custom_argv[0] = argv[0];
583
custom_argv[1] = NULL;
584
585
/* for each line in the config file, strip whitespace and ignore
586
commented text */
587
while(true){
588
sret = getline(&org_line, &size, conffp);
589
if(sret == -1){
590
break;
591
}
592
593
line = org_line;
594
arg = strsep(&line, comment_delim);
595
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
if(p[0] == '\0'){
597
continue;
598
}
599
new_arg = strdup(p);
600
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
603
free(org_line);
604
goto fallback;
605
}
606
607
custom_argc += 1;
608
custom_argv = realloc(custom_argv, sizeof(char *)
609
* ((unsigned int) custom_argc + 1));
610
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
613
free(org_line);
614
goto fallback;
615
}
616
custom_argv[custom_argc-1] = new_arg;
617
custom_argv[custom_argc] = NULL;
618
}
619
}
620
do{
621
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
623
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
free(org_line);
629
} else {
630
/* Check for harmful errors and go to fallback. Other errors might
631
not affect opening plugins */
632
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
633
perror("fopen");
634
exitstatus = EXIT_FAILURE;
635
goto fallback;
636
}
637
}
638
/* If there was any arguments from configuration file,
639
pass them to parser as command arguments */
640
if(custom_argv != NULL){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
347
644
fprintf(stderr, "Unknown error while parsing arguments\n");
348
645
exitstatus = EXIT_FAILURE;
349
goto end;
646
goto fallback;
350
647
}
351
648
}
352
649
650
/* Parse actual command line arguments, to let them override the
651
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
exitstatus = EXIT_FAILURE;
656
goto fallback;
657
}
658
353
659
if(debug){
354
660
for(plugin *p = plugin_list; p != NULL; p=p->next){
355
661
fprintf(stderr, "Plugin: %s has %d arguments\n",
357
663
for(char **a = p->argv; *a != NULL; a++){
358
664
fprintf(stderr, "\tArg: %s\n", *a);
359
665
}
666
fprintf(stderr, "...and %d environment variables\n", p->envc);
667
for(char **a = p->environ; *a != NULL; a++){
668
fprintf(stderr, "\t%s\n", *a);
669
}
360
670
}
361
671
}
362
672
673
/* Strip permissions down to nobody */
674
setgid(gid);
675
if(ret == -1){
676
perror("setgid");
677
}
363
678
ret = setuid(uid);
364
if (ret == -1){
679
if(ret == -1){
365
680
perror("setuid");
366
681
}
367
682
368
setgid(gid);
369
if (ret == -1){
370
perror("setgid");
683
if(plugindir == NULL){
684
dir = opendir(PDIR);
685
} else {
686
dir = opendir(plugindir);
371
687
}
372
688
373
dir = opendir(plugindir);
374
689
if(dir == NULL){
375
690
perror("Could not open plugin dir");
376
691
exitstatus = EXIT_FAILURE;
377
goto end;
692
goto fallback;
378
693
}
379
694
380
695
/* Set the FD_CLOEXEC flag on the directory, if possible */
385
700
if(ret < 0){
386
701
perror("set_cloexec_flag");
387
702
exitstatus = EXIT_FAILURE;
388
goto end;
703
goto fallback;
389
704
}
390
705
}
391
706
}
392
707
393
708
FD_ZERO(&rfds_all);
394
709
710
/* Read and execute any executable in the plugin directory*/
395
711
while(true){
396
712
dirst = readdir(dir);
397
713
398
// All directory entries have been processed
714
/* All directory entries have been processed */
399
715
if(dirst == NULL){
400
if (errno == EBADF){
716
if(errno == EBADF){
401
717
perror("readdir");
402
718
exitstatus = EXIT_FAILURE;
403
goto end;
719
goto fallback;
404
720
}
405
721
break;
406
722
}
407
723
408
724
d_name_len = strlen(dirst->d_name);
409
725
410
// Ignore dotfiles, backup files and other junk
726
/* Ignore dotfiles, backup files and other junk */
411
727
{
412
728
bool bad_name = false;
413
729
415
731
416
732
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
417
733
".dpkg-old",
734
".dpkg-bak",
418
735
".dpkg-divert", NULL };
419
736
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
737
size_t pre_len = strlen(*pre);
428
745
break;
429
746
}
430
747
}
431
432
748
if(bad_name){
433
749
continue;
434
750
}
435
436
751
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
752
size_t suf_len = strlen(*suf);
438
753
if((d_name_len >= suf_len)
452
767
}
453
768
}
454
769
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
770
char *filename;
771
if(plugindir == NULL){
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
773
} else {
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
775
}
776
if(ret < 0){
777
perror("asprintf");
458
778
continue;
459
779
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
463
780
464
781
ret = stat(filename, &st);
465
if (ret == -1){
782
if(ret == -1){
466
783
perror("stat");
467
784
free(filename);
468
785
continue;
469
786
}
470
787
471
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
788
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
472
790
if(debug){
473
791
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
474
792
" with bad type or mode\n", filename);
476
794
free(filename);
477
795
continue;
478
796
}
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
797
798
plugin *p = getplugin(dirst->d_name);
799
if(p == NULL){
800
perror("getplugin");
801
free(filename);
802
continue;
803
}
804
if(p->disabled){
480
805
if(debug){
481
806
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
482
807
dirst->d_name);
484
809
free(filename);
485
810
continue;
486
811
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
812
{
489
813
/* Add global arguments to argument list for this plugin */
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
814
plugin *g = getplugin(NULL);
815
if(g != NULL){
816
for(char **a = g->argv + 1; *a != NULL; a++){
817
if(not add_argument(p, *a)){
818
perror("add_argument");
819
}
820
}
821
/* Add global environment variables */
822
for(char **e = g->environ; *e != NULL; e++){
823
if(not add_environment(p, *e, false)){
824
perror("add_environment");
825
}
826
}
827
}
828
}
829
/* If this plugin has any environment variables, we will call
830
using execve and need to duplicate the environment from this
831
process, too. */
832
if(p->environ[0] != NULL){
833
for(char **e = environ; *e != NULL; e++){
834
if(not add_environment(p, *e, false)){
835
perror("add_environment");
836
}
837
}
838
}
839
840
int pipefd[2];
496
841
ret = pipe(pipefd);
497
if (ret == -1){
842
if(ret == -1){
498
843
perror("pipe");
499
844
exitstatus = EXIT_FAILURE;
500
goto end;
845
goto fallback;
501
846
}
847
/* Ask OS to automatic close the pipe on exec */
502
848
ret = set_cloexec_flag(pipefd[0]);
503
849
if(ret < 0){
504
850
perror("set_cloexec_flag");
505
851
exitstatus = EXIT_FAILURE;
506
goto end;
852
goto fallback;
507
853
}
508
854
ret = set_cloexec_flag(pipefd[1]);
509
855
if(ret < 0){
510
856
perror("set_cloexec_flag");
511
857
exitstatus = EXIT_FAILURE;
512
goto end;
858
goto fallback;
513
859
}
514
860
/* Block SIGCHLD until process is safely in process list */
515
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
862
if(ret < 0){
517
863
perror("sigprocmask");
518
864
exitstatus = EXIT_FAILURE;
519
goto end;
865
goto fallback;
520
866
}
521
// Starting a new process to be watched
867
/* Starting a new process to be watched */
522
868
pid_t pid = fork();
523
869
if(pid == -1){
524
870
perror("fork");
525
871
exitstatus = EXIT_FAILURE;
526
goto end;
872
goto fallback;
527
873
}
528
874
if(pid == 0){
529
875
/* this is the child process */
532
878
perror("sigaction");
533
879
_exit(EXIT_FAILURE);
534
880
}
535
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
881
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
536
882
if(ret < 0){
537
883
perror("sigprocmask");
538
884
_exit(EXIT_FAILURE);
539
885
}
540
886
541
887
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
542
888
if(ret == -1){
543
889
perror("dup2");
549
895
above and must now close it manually here. */
550
896
closedir(dir);
551
897
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
898
if(p->environ[0] == NULL){
899
if(execv(filename, p->argv) < 0){
900
perror("execv");
901
_exit(EXIT_FAILURE);
902
}
903
} else {
904
if(execve(filename, p->argv, p->environ) < 0){
905
perror("execve");
906
_exit(EXIT_FAILURE);
907
}
555
908
}
556
909
/* no return */
557
910
}
558
/* parent process */
911
/* Parent process */
912
close(pipefd[1]); /* Close unused write end of pipe */
559
913
free(filename);
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
564
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
914
plugin *new_plugin = getplugin(dirst->d_name);
915
if(new_plugin == NULL){
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
565
918
if(ret < 0){
566
perror("sigprocmask");
919
perror("sigprocmask");
567
920
}
568
921
exitstatus = EXIT_FAILURE;
569
goto end;
922
goto fallback;
570
923
}
571
924
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
925
new_plugin->pid = pid;
926
new_plugin->fd = pipefd[0];
927
577
928
/* Unblock SIGCHLD so signal handler can be run if this process
578
929
has already completed */
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
931
if(ret < 0){
581
932
perror("sigprocmask");
582
933
exitstatus = EXIT_FAILURE;
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
934
goto fallback;
935
}
936
937
FD_SET(new_plugin->fd, &rfds_all);
938
939
if(maxfd < new_plugin->fd){
940
maxfd = new_plugin->fd;
941
}
599
942
}
600
943
601
944
closedir(dir);
602
945
dir = NULL;
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
946
free_plugin(getplugin(NULL));
947
948
for(plugin *p = plugin_list; p != NULL; p = p->next){
949
if(p->pid != 0){
950
break;
951
}
952
if(p->next == NULL){
953
fprintf(stderr, "No plugin processes started. Incorrect plugin"
954
" directory?\n");
955
free_plugin_list();
956
}
608
957
}
609
while(process_list){
958
959
/* Main loop while running plugins exist */
960
while(plugin_list){
610
961
fd_set rfds = rfds_all;
611
962
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
if (select_ret == -1){
963
if(select_ret == -1){
613
964
perror("select");
614
965
exitstatus = EXIT_FAILURE;
615
goto end;
966
goto fallback;
616
967
}
617
968
/* OK, now either a process completed, or something can be read
618
969
from one of them */
619
for(process *proc = process_list; proc ; proc = proc->next){
970
for(plugin *proc = plugin_list; proc != NULL;){
620
971
/* Is this process completely done? */
621
if(proc->eof and proc->completed){
972
if(proc->completed and proc->eof){
622
973
/* Only accept the plugin output if it exited cleanly */
623
974
if(not WIFEXITED(proc->status)
624
975
or WEXITSTATUS(proc->status) != 0){
625
976
/* Bad exit by plugin */
977
626
978
if(debug){
627
979
if(WIFEXITED(proc->status)){
628
fprintf(stderr, "Plugin %u exited with status %d\n",
629
(unsigned int) (proc->pid),
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
981
" status %d\n", proc->name,
982
(intmax_t) (proc->pid),
630
983
WEXITSTATUS(proc->status));
631
} else if(WIFSIGNALED(proc->status)) {
632
fprintf(stderr, "Plugin %u killed by signal %d\n",
633
(unsigned int) (proc->pid),
634
WTERMSIG(proc->status));
984
} else if(WIFSIGNALED(proc->status)){
985
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
986
" signal %d: %s\n", proc->name,
987
(intmax_t) (proc->pid),
988
WTERMSIG(proc->status),
989
strsignal(WTERMSIG(proc->status)));
635
990
} else if(WCOREDUMP(proc->status)){
636
fprintf(stderr, "Plugin %d dumped core\n",
637
(unsigned int) (proc->pid));
991
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
992
" core\n", proc->name, (intmax_t) (proc->pid));
638
993
}
639
994
}
995
640
996
/* Remove the plugin */
641
997
FD_CLR(proc->fd, &rfds_all);
998
642
999
/* Block signal while modifying process_list */
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
644
1001
if(ret < 0){
645
1002
perror("sigprocmask");
646
1003
exitstatus = EXIT_FAILURE;
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
1004
goto fallback;
1005
}
1006
1007
plugin *next_plugin = proc->next;
1008
free_plugin(proc);
1009
proc = next_plugin;
1010
662
1011
/* We are done modifying process list, so unblock signal */
663
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
NULL);
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
665
1014
if(ret < 0){
666
1015
perror("sigprocmask");
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
1016
exitstatus = EXIT_FAILURE;
1017
goto fallback;
1018
}
1019
1020
if(plugin_list == NULL){
1021
break;
1022
}
1023
1024
continue;
674
1025
}
1026
675
1027
/* This process exited nicely, so print its buffer */
676
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1028
1029
bool bret = print_out_password(proc->buffer,
1030
proc->buffer_length);
678
1031
if(not bret){
679
1032
perror("print_out_password");
680
1033
exitstatus = EXIT_FAILURE;
681
1034
}
682
goto end;
1035
goto fallback;
683
1036
}
1037
684
1038
/* This process has not completed. Does it have any output? */
685
1039
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
686
1040
/* This process had nothing to say at this time */
1041
proc = proc->next;
687
1042
continue;
688
1043
}
689
1044
/* Before reading, make the process' data buffer large enough */
690
1045
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
691
1046
proc->buffer = realloc(proc->buffer, proc->buffer_size
692
1047
+ (size_t) BUFFER_SIZE);
693
if (proc->buffer == NULL){
1048
if(proc->buffer == NULL){
694
1049
perror("malloc");
695
1050
exitstatus = EXIT_FAILURE;
696
goto end;
1051
goto fallback;
697
1052
}
698
1053
proc->buffer_size += BUFFER_SIZE;
699
1054
}
700
1055
/* Read from the process */
701
ret = read(proc->fd, proc->buffer + proc->buffer_length,
702
BUFFER_SIZE);
703
if(ret < 0){
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1058
if(sret < 0){
704
1059
/* Read error from this process; ignore the error */
1060
proc = proc->next;
705
1061
continue;
706
1062
}
707
if(ret == 0){
1063
if(sret == 0){
708
1064
/* got EOF */
709
1065
proc->eof = true;
710
1066
} else {
711
proc->buffer_length += (size_t) ret;
1067
proc->buffer_length += (size_t) sret;
712
1068
}
713
1069
}
714
1070
}
715
716
717
end:
718
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
1071
1072
1073
fallback:
1074
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1076
/* Fallback if all plugins failed, none are found or an error
1077
occured */
721
1078
bool bret;
722
1079
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
1080
char *passwordbuffer = getpass("Password: ");
724
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1081
size_t len = strlen(passwordbuffer);
1082
/* Strip trailing newline */
1083
if(len > 0 and passwordbuffer[len-1] == '\n'){
1084
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1085
len--;
1086
}
1087
bret = print_out_password(passwordbuffer, len);
725
1088
if(not bret){
726
1089
perror("print_out_password");
727
1090
exitstatus = EXIT_FAILURE;
728
goto end;
729
1091
}
730
1092
}
731
1093
732
1094
/* Restore old signal handler */
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
1095
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1096
if(ret == -1){
1097
perror("sigaction");
1098
exitstatus = EXIT_FAILURE;
1099
}
1100
1101
if(custom_argv != NULL){
1102
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1103
free(*arg);
1104
}
1105
free(custom_argv);
742
1106
}
743
1107
744
1108
if(dir != NULL){
745
1109
closedir(dir);
746
1110
}
747
1111
748
/* Free the process list and kill the processes */
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1112
/* Kill the processes */
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
if(p->pid != 0){
1115
close(p->fd);
1116
ret = kill(p->pid, SIGTERM);
1117
if(ret == -1 and errno != ESRCH){
1118
/* Set-uid proccesses might not get closed */
1119
perror("kill");
1120
}
756
1121
}
757
free(process_list->buffer);
758
free(process_list);
759
1122
}
760
1123
761
1124
/* Wait for any remaining child processes to terminate */
766
1129
perror("wait");
767
1130
}
768
1131
1132
free_plugin_list();
1133
1134
free(plugindir);
1135
free(argfile);
1136
769
1137
return exitstatus;
770
1138
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0