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- Committer: Teddy Hogeborn
- Date: 2008-11-08 17:26:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20081108172635-6eexzbysvsk4bu1z
* mandos: Also import "with_statement" and "absolute_import" from
"__future__. Import "closing" from "contextlib".
(Client.__init__): Use "with closing" on "secfile".
(Client.checker_callback): Call "self.bump_timeout()" instead of
doing it directly.
(Client.bump_timeout): New method to bump up the timeout.
(TCP_handler.handle): Simplify code to provide fallback default for
GnuTLS priority string.
(IPv6_TCPServer): Do not inherit from
"SocketServer.ForkingTCPServer", since that is
undocumented - instead, follow the example code
from the documentation.
(if_nametoindex): Use "with closing" on the socket.
"__future__. Import "closing" from "contextlib".
(Client.__init__): Use "with closing" on "secfile".
(Client.checker_callback): Call "self.bump_timeout()" instead of
doing it directly.
(Client.bump_timeout): New method to bump up the timeout.
(TCP_handler.handle): Simplify code to provide fallback default for
GnuTLS priority string.
(IPv6_TCPServer): Do not inherit from
"SocketServer.ForkingTCPServer", since that is
undocumented - instead, follow the example code
from the documentation.
(if_nametoindex): Use "with closing" on the socket.
- 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
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
6
6
*
7
7
* This program is free software: you can redistribute it and/or
8
8
* modify it under the terms of the GNU General Public License as
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
29
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
stderr, STDOUT_FILENO */
32
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
33
stat, waitpid(), WIFEXITED(),
34
34
WEXITSTATUS(), wait(), pid_t,
46
46
fcntl(), setuid(), setgid(),
47
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
49
dup2(), STDOUT_FILENO, _exit(),
50
50
execv(), write(), read(),
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#define BUFFER_SIZE 256
68
#define CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner " VERSION;
71
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
74
73
struct process;
75
typedef struct plugin{
76
char *name; /* can be NULL or any plugin name */
77
char **argv;
78
int argc;
79
char **environ;
80
int envc;
81
bool disabled;
74
82
75
typedef struct process{
83
/* Variables used for running processes*/
76
84
pid_t pid;
77
85
int fd;
78
86
char *buffer;
79
87
size_t buffer_size;
80
88
size_t buffer_length;
81
89
bool eof;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
90
volatile bool completed;
91
volatile int status;
92
92
struct plugin *next;
93
93
} plugin;
94
94
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
97
102
if ((p->name == name)
98
103
or (p->name and name and (strcmp(p->name, name) == 0))){
99
104
return p;
102
107
/* Create a new plugin */
103
108
plugin *new_plugin = malloc(sizeof(plugin));
104
109
if (new_plugin == NULL){
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
110
return NULL;
111
}
112
char *copy_name = NULL;
113
if(name != NULL){
114
copy_name = strdup(name);
115
if(copy_name == NULL){
116
return NULL;
117
}
118
}
119
120
*new_plugin = (plugin) { .name = copy_name,
121
.argc = 1,
122
.disabled = false,
123
.next = plugin_list };
124
109
125
new_plugin->argv = malloc(sizeof(char *) * 2);
110
126
if (new_plugin->argv == NULL){
111
perror("malloc");
112
exit(EXIT_FAILURE);
127
free(copy_name);
128
free(new_plugin);
129
return NULL;
113
130
}
114
new_plugin->argv[0] = name;
131
new_plugin->argv[0] = copy_name;
115
132
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
133
134
new_plugin->environ = malloc(sizeof(char *));
135
if(new_plugin->environ == NULL){
136
free(copy_name);
137
free(new_plugin->argv);
138
free(new_plugin);
139
return NULL;
140
}
141
new_plugin->environ[0] = NULL;
142
119
143
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
121
145
return new_plugin;
122
146
}
123
147
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
p->argv[p->argc] = NULL;
148
/* Helper function for add_argument and add_environment */
149
static bool add_to_char_array(const char *new, char ***array,
150
int *len){
151
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
154
/* Malloc check */
155
if(*array == NULL){
156
return false;
157
}
158
/* Make a copy of the new string */
159
char *copy = strdup(new);
160
if(copy == NULL){
161
return false;
162
}
163
/* Insert the copy */
164
(*array)[*len] = copy;
165
(*len)++;
166
/* Add a new terminating NULL pointer to the last element */
167
(*array)[*len] = NULL;
168
return true;
169
}
170
171
/* Add to a plugin's argument vector */
172
static bool add_argument(plugin *p, const char *arg){
173
if(p == NULL){
174
return false;
175
}
176
return add_to_char_array(arg, &(p->argv), &(p->argc));
177
}
178
179
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
181
if(p == NULL){
182
return false;
183
}
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
190
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
193
return false;
194
}
195
*e = new;
196
strcpy(*e, def);
197
}
198
return true;
199
}
200
}
201
return add_to_char_array(def, &(p->environ), &(p->envc));
133
202
}
134
203
135
204
/*
137
206
* Descriptor Flags".
138
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
139
208
*/
140
static int set_cloexec_flag(int fd)
141
{
209
static int set_cloexec_flag(int fd){
142
210
int ret = fcntl(fd, F_GETFD, 0);
143
211
/* If reading the flags failed, return error indication now. */
144
212
if(ret < 0){
148
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
149
217
}
150
218
151
process *process_list = NULL;
152
219
153
/* Mark a process as completed when it exits, and save its exit
220
/* Mark processes as completed when they exit, and save their exit
154
221
status. */
155
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
proc->completed = true;
222
static void handle_sigchld(__attribute__((unused)) int sig){
223
while(true){
224
plugin *proc = plugin_list;
225
int status;
226
pid_t pid = waitpid(-1, &status, WNOHANG);
227
if(pid == 0){
228
/* Only still running child processes */
229
break;
230
}
231
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
234
}
235
/* No child processes */
236
break;
237
}
238
239
/* A child exited, find it in process_list */
240
while(proc != NULL and proc->pid != pid){
241
proc = proc->next;
242
}
243
if(proc == NULL){
244
/* Process not found in process list */
245
continue;
246
}
247
proc->status = status;
248
proc->completed = true;
249
}
172
250
}
173
251
174
bool print_out_password(const char *buffer, size_t length){
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
175
254
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
179
255
for(size_t written = 0; written < length; written += (size_t)ret){
180
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
257
length - written));
186
262
return true;
187
263
}
188
264
189
char ** addcustomargument(char **argv, int *argc, char *arg){
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
267
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
free(*arg);
270
}
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
273
free(*env);
274
}
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
190
277
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
282
} else {
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
287
break;
288
}
196
289
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
290
}
291
292
free(plugin_node);
293
}
294
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
298
}
209
299
}
210
300
211
301
int main(int argc, char *argv[]){
212
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
214
304
FILE *conffp;
215
305
size_t d_name_len;
216
306
DIR *dir = NULL;
231
321
/* Establish a signal handler */
232
322
sigemptyset(&sigchld_action.sa_mask);
233
323
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
324
if(ret == -1){
235
325
perror("sigaddset");
236
exit(EXIT_FAILURE);
326
exitstatus = EXIT_FAILURE;
327
goto fallback;
237
328
}
238
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
330
if(ret == -1){
240
331
perror("sigaction");
241
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
242
334
}
243
335
244
336
/* The options we understand. */
246
338
{ .name = "global-options", .key = 'g',
247
339
.arg = "OPTION[,OPTION[,...]]",
248
340
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
342
.arg = "VAR=value",
343
.doc = "Environment variable passed to all plugins" },
249
344
{ .name = "options-for", .key = 'o',
250
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
346
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
348
.arg = "PLUGIN:ENV=value",
349
.doc = "Environment variable passed to specified plugin" },
252
350
{ .name = "disable", .key = 'd',
253
351
.arg = "PLUGIN",
254
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
255
356
{ .name = "plugin-dir", .key = 128,
256
357
.arg = "DIRECTORY",
257
358
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
359
{ .name = "config-file", .key = 129,
360
.arg = "FILE",
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
266
370
{ .name = NULL }
267
371
};
268
372
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
273
375
switch (key) {
274
case 'g':
376
case 'g': /* --global-options */
275
377
if (arg != NULL){
276
378
char *p;
277
379
while((p = strsep(&arg, ",")) != NULL){
278
380
if(p[0] == '\0'){
279
381
continue;
280
382
}
281
addargument(getplugin(NULL, plugins), p);
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
386
}
282
387
}
283
388
}
284
389
break;
285
case 'o':
390
case 'G': /* --global-env */
391
if(arg == NULL){
392
break;
393
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
396
}
397
break;
398
case 'o': /* --options-for */
286
399
if (arg != NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
289
402
break;
290
403
}
291
404
char *opt = strsep(&arg, ":");
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
405
if(opt[0] == '\0' or opt == NULL){
406
break;
407
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
416
}
417
}
418
}
419
break;
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
{
425
char *envdef = strchr(arg, ':');
426
if(envdef == NULL){
427
break;
428
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
432
}
433
}
434
break;
435
case 'd': /* --disable */
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
442
}
443
break;
444
case 'e': /* --enable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
315
464
uid = (uid_t)strtol(arg, NULL, 10);
316
465
break;
317
case 130:
466
case 131: /* --groupid */
318
467
gid = (gid_t)strtol(arg, NULL, 10);
319
468
break;
320
case 131:
469
case 132: /* --debug */
321
470
debug = true;
322
471
break;
323
472
case ARGP_KEY_ARG:
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
338
524
.doc = "Mandos plugin runner -- Run plugins" };
339
525
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
341
529
if (ret == ARGP_ERR_UNKNOWN){
342
530
fprintf(stderr, "Unknown error while parsing arguments\n");
343
531
exitstatus = EXIT_FAILURE;
344
goto end;
532
goto fallback;
345
533
}
346
347
conffp = fopen(conffile, "r");
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
541
} else {
542
conffp = fopen(argfile, "r");
543
}
348
544
if(conffp != NULL){
349
545
char *org_line = NULL;
546
char *p, *arg, *new_arg, *line;
350
547
size_t size = 0;
351
548
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
549
const char whitespace_delims[] = " \r\t\f\v\n";
354
550
const char comment_delim[] = "#";
355
551
552
custom_argc = 1;
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
558
}
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
356
564
while(true){
357
565
sret = getline(&org_line, &size, conffp);
358
566
if(sret == -1){
366
574
continue;
367
575
}
368
576
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
584
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
592
}
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
375
595
}
376
596
}
377
597
free(org_line);
378
} else{
379
/* check for harmfull errors */
598
} else {
599
/* Check for harmful errors and go to fallback. Other errors might
600
not affect opening plugins */
380
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
381
602
perror("fopen");
382
603
exitstatus = EXIT_FAILURE;
383
goto end;
604
goto fallback;
384
605
}
385
606
}
386
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
387
609
if(custom_argv != NULL){
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
390
612
if (ret == ARGP_ERR_UNKNOWN){
391
613
fprintf(stderr, "Unknown error while parsing arguments\n");
392
614
exitstatus = EXIT_FAILURE;
393
goto end;
615
goto fallback;
394
616
}
395
617
}
396
618
619
/* Parse actual command line arguments, to let them override the
620
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
397
628
if(debug){
398
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
399
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
401
632
for(char **a = p->argv; *a != NULL; a++){
402
633
fprintf(stderr, "\tArg: %s\n", *a);
403
634
}
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
636
for(char **a = p->environ; *a != NULL; a++){
637
fprintf(stderr, "\t%s\n", *a);
638
}
404
639
}
405
640
}
406
641
642
/* Strip permissions down to nobody */
407
643
ret = setuid(uid);
408
644
if (ret == -1){
409
645
perror("setuid");
410
}
411
646
}
412
647
setgid(gid);
413
648
if (ret == -1){
414
649
perror("setgid");
415
650
}
416
651
417
dir = opendir(plugindir);
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
418
658
if(dir == NULL){
419
659
perror("Could not open plugin dir");
420
660
exitstatus = EXIT_FAILURE;
421
goto end;
661
goto fallback;
422
662
}
423
663
424
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
429
669
if(ret < 0){
430
670
perror("set_cloexec_flag");
431
671
exitstatus = EXIT_FAILURE;
432
goto end;
672
goto fallback;
433
673
}
434
674
}
435
675
}
436
676
437
677
FD_ZERO(&rfds_all);
438
678
679
/* Read and execute any executable in the plugin directory*/
439
680
while(true){
440
681
dirst = readdir(dir);
441
682
442
// All directory entries have been processed
683
/* All directory entries have been processed */
443
684
if(dirst == NULL){
444
685
if (errno == EBADF){
445
686
perror("readdir");
446
687
exitstatus = EXIT_FAILURE;
447
goto end;
688
goto fallback;
448
689
}
449
690
break;
450
691
}
451
692
452
693
d_name_len = strlen(dirst->d_name);
453
694
454
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
455
696
{
456
697
bool bad_name = false;
457
698
459
700
460
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
461
702
".dpkg-old",
703
".dpkg-bak",
462
704
".dpkg-divert", NULL };
463
705
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
464
706
size_t pre_len = strlen(*pre);
472
714
break;
473
715
}
474
716
}
475
476
717
if(bad_name){
477
718
continue;
478
719
}
479
480
720
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
481
721
size_t suf_len = strlen(*suf);
482
722
if((d_name_len >= suf_len)
495
735
continue;
496
736
}
497
737
}
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
perror("malloc");
738
739
char *filename;
740
if(plugindir == NULL){
741
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
742
} else {
743
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
}
745
if(ret < 0){
746
perror("asprintf");
502
747
continue;
503
748
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
507
749
508
750
ret = stat(filename, &st);
509
751
if (ret == -1){
511
753
free(filename);
512
754
continue;
513
755
}
514
756
757
/* Ignore non-executable files */
515
758
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
516
759
if(debug){
517
760
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
520
763
free(filename);
521
764
continue;
522
765
}
523
if(getplugin(dirst->d_name, &plugin_list)->disabled){
766
767
plugin *p = getplugin(dirst->d_name);
768
if(p == NULL){
769
perror("getplugin");
770
free(filename);
771
continue;
772
}
773
if(p->disabled){
524
774
if(debug){
525
775
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
526
776
dirst->d_name);
528
778
free(filename);
529
779
continue;
530
780
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
532
781
{
533
782
/* Add global arguments to argument list for this plugin */
534
plugin *g = getplugin(NULL, &plugin_list);
535
for(char **a = g->argv + 1; *a != NULL; a++){
536
addargument(p, *a);
537
}
538
}
539
int pipefd[2];
783
plugin *g = getplugin(NULL);
784
if(g != NULL){
785
for(char **a = g->argv + 1; *a != NULL; a++){
786
if(not add_argument(p, *a)){
787
perror("add_argument");
788
}
789
}
790
/* Add global environment variables */
791
for(char **e = g->environ; *e != NULL; e++){
792
if(not add_environment(p, *e, false)){
793
perror("add_environment");
794
}
795
}
796
}
797
}
798
/* If this plugin has any environment variables, we will call
799
using execve and need to duplicate the environment from this
800
process, too. */
801
if(p->environ[0] != NULL){
802
for(char **e = environ; *e != NULL; e++){
803
if(not add_environment(p, *e, false)){
804
perror("add_environment");
805
}
806
}
807
}
808
809
int pipefd[2];
540
810
ret = pipe(pipefd);
541
811
if (ret == -1){
542
812
perror("pipe");
543
813
exitstatus = EXIT_FAILURE;
544
goto end;
814
goto fallback;
545
815
}
816
/* Ask OS to automatic close the pipe on exec */
546
817
ret = set_cloexec_flag(pipefd[0]);
547
818
if(ret < 0){
548
819
perror("set_cloexec_flag");
549
820
exitstatus = EXIT_FAILURE;
550
goto end;
821
goto fallback;
551
822
}
552
823
ret = set_cloexec_flag(pipefd[1]);
553
824
if(ret < 0){
554
825
perror("set_cloexec_flag");
555
826
exitstatus = EXIT_FAILURE;
556
goto end;
827
goto fallback;
557
828
}
558
829
/* Block SIGCHLD until process is safely in process list */
559
830
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
560
831
if(ret < 0){
561
832
perror("sigprocmask");
562
833
exitstatus = EXIT_FAILURE;
563
goto end;
834
goto fallback;
564
835
}
565
// Starting a new process to be watched
836
/* Starting a new process to be watched */
566
837
pid_t pid = fork();
567
838
if(pid == -1){
568
839
perror("fork");
569
840
exitstatus = EXIT_FAILURE;
570
goto end;
841
goto fallback;
571
842
}
572
843
if(pid == 0){
573
844
/* this is the child process */
576
847
perror("sigaction");
577
848
_exit(EXIT_FAILURE);
578
849
}
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
851
if(ret < 0){
581
852
perror("sigprocmask");
582
853
_exit(EXIT_FAILURE);
583
854
}
584
855
585
856
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
586
857
if(ret == -1){
587
858
perror("dup2");
593
864
above and must now close it manually here. */
594
865
closedir(dir);
595
866
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_exit(EXIT_FAILURE);
867
if(p->environ[0] == NULL){
868
if(execv(filename, p->argv) < 0){
869
perror("execv");
870
_exit(EXIT_FAILURE);
871
}
872
} else {
873
if(execve(filename, p->argv, p->environ) < 0){
874
perror("execve");
875
_exit(EXIT_FAILURE);
876
}
599
877
}
600
878
/* no return */
601
879
}
602
/* parent process */
880
/* Parent process */
881
close(pipefd[1]); /* Close unused write end of pipe */
603
882
free(filename);
604
close(pipefd[1]); /* close unused write end of pipe */
605
process *new_process = malloc(sizeof(process));
606
if (new_process == NULL){
607
perror("malloc");
883
plugin *new_plugin = getplugin(dirst->d_name);
884
if (new_plugin == NULL){
885
perror("getplugin");
608
886
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
609
887
if(ret < 0){
610
perror("sigprocmask");
888
perror("sigprocmask");
611
889
}
612
890
exitstatus = EXIT_FAILURE;
613
goto end;
891
goto fallback;
614
892
}
615
893
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
894
new_plugin->pid = pid;
895
new_plugin->fd = pipefd[0];
896
621
897
/* Unblock SIGCHLD so signal handler can be run if this process
622
898
has already completed */
623
899
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
624
900
if(ret < 0){
625
901
perror("sigprocmask");
626
902
exitstatus = EXIT_FAILURE;
627
goto end;
628
}
629
630
FD_SET(new_process->fd, &rfds_all);
631
632
if (maxfd < new_process->fd){
633
maxfd = new_process->fd;
634
}
635
636
}
637
638
/* Free the plugin list */
639
for(plugin *next; plugin_list != NULL; plugin_list = next){
640
next = plugin_list->next;
641
free(plugin_list->argv);
642
free(plugin_list);
903
goto fallback;
904
}
905
906
FD_SET(new_plugin->fd, &rfds_all);
907
908
if (maxfd < new_plugin->fd){
909
maxfd = new_plugin->fd;
910
}
643
911
}
644
912
645
913
closedir(dir);
646
914
dir = NULL;
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
process_list = NULL;
915
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
if(p->pid != 0){
918
break;
919
}
920
if(p->next == NULL){
921
fprintf(stderr, "No plugin processes started. Incorrect plugin"
922
" directory?\n");
923
free_plugin_list();
924
}
652
925
}
653
while(process_list){
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
654
929
fd_set rfds = rfds_all;
655
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
656
931
if (select_ret == -1){
657
932
perror("select");
658
933
exitstatus = EXIT_FAILURE;
659
goto end;
934
goto fallback;
660
935
}
661
936
/* OK, now either a process completed, or something can be read
662
937
from one of them */
663
for(process *proc = process_list; proc ; proc = proc->next){
938
for(plugin *proc = plugin_list; proc != NULL;){
664
939
/* Is this process completely done? */
665
940
if(proc->eof and proc->completed){
666
941
/* Only accept the plugin output if it exited cleanly */
667
942
if(not WIFEXITED(proc->status)
668
943
or WEXITSTATUS(proc->status) != 0){
669
944
/* Bad exit by plugin */
945
670
946
if(debug){
671
947
if(WIFEXITED(proc->status)){
672
948
fprintf(stderr, "Plugin %u exited with status %d\n",
681
957
(unsigned int) (proc->pid));
682
958
}
683
959
}
960
684
961
/* Remove the plugin */
685
962
FD_CLR(proc->fd, &rfds_all);
963
686
964
/* Block signal while modifying process_list */
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
966
if(ret < 0){
689
967
perror("sigprocmask");
690
968
exitstatus = EXIT_FAILURE;
691
goto end;
692
}
693
/* Delete this process entry from the list */
694
if(process_list == proc){
695
/* First one - simple */
696
process_list = proc->next;
697
} else {
698
/* Second one or later */
699
for(process *p = process_list; p != NULL; p = p->next){
700
if(p->next == proc){
701
p->next = proc->next;
702
break;
703
}
704
}
705
}
969
goto fallback;
970
}
971
972
plugin *next_plugin = proc->next;
973
free_plugin(proc);
974
proc = next_plugin;
975
706
976
/* We are done modifying process list, so unblock signal */
707
977
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
708
978
NULL);
709
979
if(ret < 0){
710
980
perror("sigprocmask");
711
}
712
free(proc->buffer);
713
free(proc);
714
/* We deleted this process from the list, so we can't go
715
proc->next. Therefore, start over from the beginning of
716
the process list */
717
break;
981
exitstatus = EXIT_FAILURE;
982
goto fallback;
983
}
984
985
if(plugin_list == NULL){
986
break;
987
}
988
989
continue;
718
990
}
991
719
992
/* This process exited nicely, so print its buffer */
720
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
993
994
bool bret = print_out_password(proc->buffer,
995
proc->buffer_length);
722
996
if(not bret){
723
997
perror("print_out_password");
724
998
exitstatus = EXIT_FAILURE;
725
999
}
726
goto end;
1000
goto fallback;
727
1001
}
1002
728
1003
/* This process has not completed. Does it have any output? */
729
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
730
1005
/* This process had nothing to say at this time */
1006
proc = proc->next;
731
1007
continue;
732
1008
}
733
1009
/* Before reading, make the process' data buffer large enough */
737
1013
if (proc->buffer == NULL){
738
1014
perror("malloc");
739
1015
exitstatus = EXIT_FAILURE;
740
goto end;
1016
goto fallback;
741
1017
}
742
1018
proc->buffer_size += BUFFER_SIZE;
743
1019
}
746
1022
BUFFER_SIZE);
747
1023
if(ret < 0){
748
1024
/* Read error from this process; ignore the error */
1025
proc = proc->next;
749
1026
continue;
750
1027
}
751
1028
if(ret == 0){
758
1035
}
759
1036
760
1037
761
end:
1038
fallback:
762
1039
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* Fallback if all plugins failed, none are found or an error occured */
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1041
/* Fallback if all plugins failed, none are found or an error
1042
occured */
765
1043
bool bret;
766
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
767
1045
char *passwordbuffer = getpass("Password: ");
768
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1046
size_t len = strlen(passwordbuffer);
1047
/* Strip trailing newline */
1048
if(len > 0 and passwordbuffer[len-1] == '\n'){
1049
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1050
len--;
1051
}
1052
bret = print_out_password(passwordbuffer, len);
769
1053
if(not bret){
770
1054
perror("print_out_password");
771
1055
exitstatus = EXIT_FAILURE;
772
goto end;
773
1056
}
774
1057
}
775
1058
776
1059
/* Restore old signal handler */
777
sigaction(SIGCHLD, &old_sigchld_action, NULL);
778
779
free(custom_argv);
780
781
/* Free the plugin list */
782
for(plugin *next; plugin_list != NULL; plugin_list = next){
783
next = plugin_list->next;
784
free(plugin_list->argv);
785
free(plugin_list);
1060
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
if(ret == -1){
1062
perror("sigaction");
1063
exitstatus = EXIT_FAILURE;
1064
}
1065
1066
if(custom_argv != NULL){
1067
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1068
free(*arg);
1069
}
1070
free(custom_argv);
786
1071
}
787
1072
788
1073
if(dir != NULL){
789
1074
closedir(dir);
790
1075
}
791
1076
792
/* Free the process list and kill the processes */
793
for(process *next; process_list != NULL; process_list = next){
794
next = process_list->next;
795
close(process_list->fd);
796
ret = kill(process_list->pid, SIGTERM);
797
if(ret == -1 and errno != ESRCH){
798
/* set-uid proccesses migth not get closed */
799
perror("kill");
1077
/* Kill the processes */
1078
for(plugin *p = plugin_list; p != NULL; p = p->next){
1079
if(p->pid != 0){
1080
close(p->fd);
1081
ret = kill(p->pid, SIGTERM);
1082
if(ret == -1 and errno != ESRCH){
1083
/* Set-uid proccesses might not get closed */
1084
perror("kill");
1085
}
800
1086
}
801
free(process_list->buffer);
802
free(process_list);
803
1087
}
804
1088
805
1089
/* Wait for any remaining child processes to terminate */
810
1094
perror("wait");
811
1095
}
812
1096
1097
free_plugin_list();
1098
1099
free(plugindir);
1100
free(argfile);
1101
813
1102
return exitstatus;
814
1103
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0