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- Committer: Teddy Hogeborn
- Date: 2008-11-01 02:26:00 UTC
- Revision ID: teddy@fukt.bsnet.se-20081101022600-bacs9fxmsliqrah1
* initramfs-tools-hook: Also ignore plugins named "*.dpkg-bak".
* plugin-runner.c: - '' -
* plugin-runner.c: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- 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
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
27
31
stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2(), STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
52
53
struct process;
54
55
typedef struct process{
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
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;
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
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;
82
83
/* Variables used for running processes*/
56
84
pid_t pid;
57
85
int fd;
58
86
char *buffer;
59
87
size_t buffer_size;
60
88
size_t buffer_length;
61
89
bool eof;
62
bool completed;
63
int status;
64
struct process *next;
65
} process;
66
67
typedef struct plugin{
68
char *name; /* can be NULL or any plugin name */
69
char **argv;
70
int argc;
71
bool disabled;
90
volatile bool completed;
91
volatile int status;
72
92
struct plugin *next;
73
93
} plugin;
74
94
75
plugin *getplugin(char *name, plugin **plugin_list){
76
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){
77
102
if ((p->name == name)
78
103
or (p->name and name and (strcmp(p->name, name) == 0))){
79
104
return p;
82
107
/* Create a new plugin */
83
108
plugin *new_plugin = malloc(sizeof(plugin));
84
109
if (new_plugin == NULL){
85
perror("malloc");
86
exit(EXIT_FAILURE);
87
}
88
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
89
125
new_plugin->argv = malloc(sizeof(char *) * 2);
90
126
if (new_plugin->argv == NULL){
91
perror("malloc");
92
exit(EXIT_FAILURE);
127
free(copy_name);
128
free(new_plugin);
129
return NULL;
93
130
}
94
new_plugin->argv[0] = name;
131
new_plugin->argv[0] = copy_name;
95
132
new_plugin->argv[1] = NULL;
96
new_plugin->argc = 1;
97
new_plugin->disabled = false;
98
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
99
143
/* Append the new plugin to the list */
100
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
101
145
return new_plugin;
102
146
}
103
147
104
void addargument(plugin *p, char *arg){
105
p->argv[p->argc] = arg;
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
107
if (p->argv == NULL){
108
perror("malloc");
109
exit(EXIT_FAILURE);
110
}
111
p->argc++;
112
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));
113
202
}
114
203
115
204
/*
117
206
* Descriptor Flags".
118
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
119
208
*/
120
int set_cloexec_flag(int fd)
121
{
209
static int set_cloexec_flag(int fd){
122
210
int ret = fcntl(fd, F_GETFD, 0);
123
211
/* If reading the flags failed, return error indication now. */
124
212
if(ret < 0){
128
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
129
217
}
130
218
131
#define BUFFER_SIZE 256
132
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
219
220
/* Mark processes as completed when they exit, and save their exit
139
221
status. */
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
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
}
250
}
251
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
254
ssize_t ret;
255
for(size_t written = 0; written < length; written += (size_t)ret){
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
length - written));
258
if(ret < 0){
259
return false;
260
}
261
}
262
return true;
263
}
264
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);
277
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
}
289
}
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
}
153
299
}
154
300
155
301
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
302
char *plugindir = NULL;
303
char *argfile = NULL;
304
FILE *conffp;
157
305
size_t d_name_len;
158
306
DIR *dir = NULL;
159
307
struct dirent *dirst;
167
315
struct sigaction old_sigchld_action;
168
316
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
317
.sa_flags = SA_NOCLDSTOP };
170
318
char **custom_argv = NULL;
319
int custom_argc = 0;
320
171
321
/* Establish a signal handler */
172
322
sigemptyset(&sigchld_action.sa_mask);
173
323
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
174
if(ret < 0){
324
if(ret == -1){
175
325
perror("sigaddset");
176
exit(EXIT_FAILURE);
326
exitstatus = EXIT_FAILURE;
327
goto fallback;
177
328
}
178
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
179
if(ret < 0){
330
if(ret == -1){
180
331
perror("sigaction");
181
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
182
334
}
183
335
184
336
/* The options we understand. */
186
338
{ .name = "global-options", .key = 'g',
187
339
.arg = "OPTION[,OPTION[,...]]",
188
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" },
189
344
{ .name = "options-for", .key = 'o',
190
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
191
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" },
192
350
{ .name = "disable", .key = 'd',
193
351
.arg = "PLUGIN",
194
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
195
356
{ .name = "plugin-dir", .key = 128,
196
357
.arg = "DIRECTORY",
197
358
.doc = "Specify a different plugin directory", .group = 2 },
198
{ .name = "userid", .key = 129,
199
.arg = "ID", .flags = 0,
200
.doc = "User ID the plugins will run as", .group = 2 },
201
{ .name = "groupid", .key = 130,
202
.arg = "ID", .flags = 0,
203
.doc = "Group ID the plugins will run as", .group = 2 },
204
{ .name = "debug", .key = 131,
205
.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 },
206
370
{ .name = NULL }
207
371
};
208
372
209
error_t parse_opt (int key, char *arg, struct argp_state *state) {
210
/* Get the INPUT argument from `argp_parse', which we know is a
211
pointer to our plugin list pointer. */
212
plugin **plugins = state->input;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
213
375
switch (key) {
214
case 'g':
215
if (arg != NULL){
216
char *p = strtok(arg, ",");
217
do{
218
addargument(getplugin(NULL, plugins), p);
219
p = strtok(NULL, ",");
220
} while (p);
221
}
222
break;
223
case 'o':
224
if (arg != NULL){
225
char *name = strtok(arg, ":");
226
char *p = strtok(NULL, ":");
227
if(p){
228
p = strtok(p, ",");
229
do{
230
addargument(getplugin(name, plugins), p);
231
p = strtok(NULL, ",");
232
} while (p);
233
}
234
}
235
break;
236
case 'd':
237
if (arg != NULL){
238
getplugin(arg, plugins)->disabled = true;
239
}
240
break;
241
case 128:
242
plugindir = arg;
243
break;
244
case 129:
376
case 'g': /* --global-options */
377
if (arg != NULL){
378
char *p;
379
while((p = strsep(&arg, ",")) != NULL){
380
if(p[0] == '\0'){
381
continue;
382
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
386
}
387
}
388
}
389
break;
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 */
399
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
402
break;
403
}
404
char *opt = strsep(&arg, ":");
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 */
245
464
uid = (uid_t)strtol(arg, NULL, 10);
246
465
break;
247
case 130:
466
case 131: /* --groupid */
248
467
gid = (gid_t)strtol(arg, NULL, 10);
249
468
break;
250
case 131:
469
case 132: /* --debug */
251
470
debug = true;
252
471
break;
253
472
case ARGP_KEY_ARG:
254
argp_usage (state);
255
break;
256
case ARGP_KEY_END:
257
break;
258
default:
259
return ARGP_ERR_UNKNOWN;
260
}
261
return 0;
262
}
263
264
plugin *plugin_list = NULL;
265
266
struct argp argp = { .options = options, .parser = parse_opt,
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,
267
523
.args_doc = "",
268
524
.doc = "Mandos plugin runner -- Run plugins" };
269
525
270
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
271
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);
529
if (ret == ARGP_ERR_UNKNOWN){
530
fprintf(stderr, "Unknown error while parsing arguments\n");
531
exitstatus = EXIT_FAILURE;
532
goto fallback;
533
}
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
}
544
if(conffp != NULL){
545
char *org_line = NULL;
546
char *p, *arg, *new_arg, *line;
547
size_t size = 0;
548
ssize_t sret;
549
const char whitespace_delims[] = " \r\t\f\v\n";
550
const char comment_delim[] = "#";
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 */
564
while(true){
565
sret = getline(&org_line, &size, conffp);
566
if(sret == -1){
567
break;
568
}
569
570
line = org_line;
571
arg = strsep(&line, comment_delim);
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
573
if(p[0] == '\0'){
574
continue;
575
}
576
new_arg = strdup(p);
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;
595
}
596
}
597
free(org_line);
598
} else {
599
/* Check for harmful errors and go to fallback. Other errors might
600
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
perror("fopen");
603
exitstatus = EXIT_FAILURE;
604
goto fallback;
605
}
606
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
609
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
615
goto fallback;
616
}
617
}
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
272
628
if(debug){
273
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
274
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
276
632
for(char **a = p->argv; *a != NULL; a++){
277
633
fprintf(stderr, "\tArg: %s\n", *a);
278
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
}
279
639
}
280
640
}
281
641
642
/* Strip permissions down to nobody */
282
643
ret = setuid(uid);
283
644
if (ret == -1){
284
645
perror("setuid");
285
}
286
646
}
287
647
setgid(gid);
288
648
if (ret == -1){
289
perror("setuid");
290
}
291
292
dir = opendir(plugindir);
649
perror("setgid");
650
}
651
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
293
658
if(dir == NULL){
294
659
perror("Could not open plugin dir");
295
660
exitstatus = EXIT_FAILURE;
296
goto end;
661
goto fallback;
297
662
}
298
663
299
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
304
669
if(ret < 0){
305
670
perror("set_cloexec_flag");
306
671
exitstatus = EXIT_FAILURE;
307
goto end;
672
goto fallback;
308
673
}
309
674
}
310
675
}
311
676
312
677
FD_ZERO(&rfds_all);
313
678
679
/* Read and execute any executable in the plugin directory*/
314
680
while(true){
315
681
dirst = readdir(dir);
316
682
317
// All directory entries have been processed
683
/* All directory entries have been processed */
318
684
if(dirst == NULL){
685
if (errno == EBADF){
686
perror("readdir");
687
exitstatus = EXIT_FAILURE;
688
goto fallback;
689
}
319
690
break;
320
691
}
321
692
322
693
d_name_len = strlen(dirst->d_name);
323
694
324
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
325
696
{
326
697
bool bad_name = false;
327
698
329
700
330
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
331
702
".dpkg-old",
703
".dpkg-bak",
332
704
".dpkg-divert", NULL };
333
705
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
334
706
size_t pre_len = strlen(*pre);
342
714
break;
343
715
}
344
716
}
345
346
717
if(bad_name){
347
718
continue;
348
719
}
349
350
720
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
351
721
size_t suf_len = strlen(*suf);
352
722
if((d_name_len >= suf_len)
365
735
continue;
366
736
}
367
737
}
368
369
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
370
if (filename == NULL){
371
perror("malloc");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
375
strcpy(filename, plugindir); /* Spurious warning */
376
strcat(filename, "/"); /* Spurious warning */
377
strcat(filename, dirst->d_name); /* Spurious warning */
378
379
stat(filename, &st);
380
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");
747
continue;
748
}
749
750
ret = stat(filename, &st);
751
if (ret == -1){
752
perror("stat");
753
free(filename);
754
continue;
755
}
756
757
/* Ignore non-executable files */
381
758
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
382
759
if(debug){
383
760
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
386
763
free(filename);
387
764
continue;
388
765
}
389
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){
390
774
if(debug){
391
775
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
392
776
dirst->d_name);
394
778
free(filename);
395
779
continue;
396
780
}
397
plugin *p = getplugin(dirst->d_name, &plugin_list);
398
781
{
399
782
/* Add global arguments to argument list for this plugin */
400
plugin *g = getplugin(NULL, &plugin_list);
401
for(char **a = g->argv + 1; *a != NULL; a++){
402
addargument(p, *a);
403
}
404
}
405
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];
406
810
ret = pipe(pipefd);
407
811
if (ret == -1){
408
812
perror("pipe");
409
813
exitstatus = EXIT_FAILURE;
410
goto end;
814
goto fallback;
411
815
}
816
/* Ask OS to automatic close the pipe on exec */
412
817
ret = set_cloexec_flag(pipefd[0]);
413
818
if(ret < 0){
414
819
perror("set_cloexec_flag");
415
820
exitstatus = EXIT_FAILURE;
416
goto end;
821
goto fallback;
417
822
}
418
823
ret = set_cloexec_flag(pipefd[1]);
419
824
if(ret < 0){
420
825
perror("set_cloexec_flag");
421
826
exitstatus = EXIT_FAILURE;
422
goto end;
827
goto fallback;
423
828
}
424
829
/* Block SIGCHLD until process is safely in process list */
425
830
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
426
831
if(ret < 0){
427
832
perror("sigprocmask");
428
833
exitstatus = EXIT_FAILURE;
429
goto end;
834
goto fallback;
430
835
}
431
// Starting a new process to be watched
836
/* Starting a new process to be watched */
432
837
pid_t pid = fork();
838
if(pid == -1){
839
perror("fork");
840
exitstatus = EXIT_FAILURE;
841
goto fallback;
842
}
433
843
if(pid == 0){
434
844
/* this is the child process */
435
845
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
437
847
perror("sigaction");
438
848
_exit(EXIT_FAILURE);
439
849
}
440
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
441
851
if(ret < 0){
442
852
perror("sigprocmask");
443
853
_exit(EXIT_FAILURE);
444
854
}
445
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
855
856
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
857
if(ret == -1){
858
perror("dup2");
859
_exit(EXIT_FAILURE);
860
}
446
861
447
862
if(dirfd(dir) < 0){
448
863
/* If dir has no file descriptor, we could not set FD_CLOEXEC
449
864
above and must now close it manually here. */
450
865
closedir(dir);
451
866
}
452
if(execv(filename, p->argv) < 0){
453
perror("execv");
454
_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
}
455
877
}
456
878
/* no return */
457
879
}
458
/* parent process */
880
/* Parent process */
881
close(pipefd[1]); /* Close unused write end of pipe */
459
882
free(filename);
460
close(pipefd[1]); /* close unused write end of pipe */
461
process *new_process = malloc(sizeof(process));
462
if (new_process == NULL){
463
perror("malloc");
883
plugin *new_plugin = getplugin(dirst->d_name);
884
if (new_plugin == NULL){
885
perror("getplugin");
464
886
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
465
887
if(ret < 0){
466
perror("sigprocmask");
888
perror("sigprocmask");
467
889
}
468
890
exitstatus = EXIT_FAILURE;
469
goto end;
891
goto fallback;
470
892
}
471
893
472
*new_process = (struct process){ .pid = pid,
473
.fd = pipefd[0],
474
.next = process_list };
475
// List handling
476
process_list = new_process;
894
new_plugin->pid = pid;
895
new_plugin->fd = pipefd[0];
896
477
897
/* Unblock SIGCHLD so signal handler can be run if this process
478
898
has already completed */
479
899
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
480
900
if(ret < 0){
481
901
perror("sigprocmask");
482
902
exitstatus = EXIT_FAILURE;
483
goto end;
484
}
485
486
FD_SET(new_process->fd, &rfds_all);
487
488
if (maxfd < new_process->fd){
489
maxfd = new_process->fd;
490
}
491
492
}
493
494
/* Free the plugin list */
495
for(plugin *next; plugin_list != NULL; plugin_list = next){
496
next = plugin_list->next;
497
free(plugin_list->argv);
498
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
}
499
911
}
500
912
501
913
closedir(dir);
502
914
dir = NULL;
503
915
504
if (process_list == NULL){
505
fprintf(stderr, "No plugin processes started, exiting\n");
506
exitstatus = EXIT_FAILURE;
507
goto end;
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
}
508
925
}
509
while(process_list){
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
510
929
fd_set rfds = rfds_all;
511
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
512
931
if (select_ret == -1){
513
932
perror("select");
514
933
exitstatus = EXIT_FAILURE;
515
goto end;
934
goto fallback;
516
935
}
517
936
/* OK, now either a process completed, or something can be read
518
937
from one of them */
519
for(process *proc = process_list; proc ; proc = proc->next){
938
for(plugin *proc = plugin_list; proc != NULL;){
520
939
/* Is this process completely done? */
521
940
if(proc->eof and proc->completed){
522
941
/* Only accept the plugin output if it exited cleanly */
523
942
if(not WIFEXITED(proc->status)
524
943
or WEXITSTATUS(proc->status) != 0){
525
944
/* Bad exit by plugin */
945
526
946
if(debug){
527
947
if(WIFEXITED(proc->status)){
528
fprintf(stderr, "Plugin %d exited with status %d\n",
529
proc->pid, WEXITSTATUS(proc->status));
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
950
WEXITSTATUS(proc->status));
530
951
} else if(WIFSIGNALED(proc->status)) {
531
fprintf(stderr, "Plugin %d killed by signal %d\n",
532
proc->pid, WTERMSIG(proc->status));
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
954
WTERMSIG(proc->status));
533
955
} else if(WCOREDUMP(proc->status)){
534
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
535
958
}
536
959
}
960
537
961
/* Remove the plugin */
538
962
FD_CLR(proc->fd, &rfds_all);
963
539
964
/* Block signal while modifying process_list */
540
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
541
966
if(ret < 0){
542
967
perror("sigprocmask");
543
968
exitstatus = EXIT_FAILURE;
544
goto end;
545
}
546
/* Delete this process entry from the list */
547
if(process_list == proc){
548
/* First one - simple */
549
process_list = proc->next;
550
} else {
551
/* Second one or later */
552
for(process *p = process_list; p != NULL; p = p->next){
553
if(p->next == proc){
554
p->next = proc->next;
555
break;
556
}
557
}
558
}
969
goto fallback;
970
}
971
972
plugin *next_plugin = proc->next;
973
free_plugin(proc);
974
proc = next_plugin;
975
559
976
/* We are done modifying process list, so unblock signal */
560
977
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
561
978
NULL);
562
979
if(ret < 0){
563
980
perror("sigprocmask");
564
}
565
free(proc->buffer);
566
free(proc);
567
/* We deleted this process from the list, so we can't go
568
proc->next. Therefore, start over from the beginning of
569
the process list */
570
break;
981
exitstatus = EXIT_FAILURE;
982
goto fallback;
983
}
984
985
if(plugin_list == NULL){
986
break;
987
}
988
989
continue;
571
990
}
991
572
992
/* This process exited nicely, so print its buffer */
573
for(size_t written = 0; written < proc->buffer_length;
574
written += (size_t)ret){
575
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
576
proc->buffer + written,
577
proc->buffer_length
578
- written));
579
if(ret < 0){
580
perror("write");
581
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
993
994
bool bret = print_out_password(proc->buffer,
995
proc->buffer_length);
996
if(not bret){
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
584
999
}
585
goto end;
1000
goto fallback;
586
1001
}
1002
587
1003
/* This process has not completed. Does it have any output? */
588
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
589
1005
/* This process had nothing to say at this time */
1006
proc = proc->next;
590
1007
continue;
591
1008
}
592
1009
/* Before reading, make the process' data buffer large enough */
596
1013
if (proc->buffer == NULL){
597
1014
perror("malloc");
598
1015
exitstatus = EXIT_FAILURE;
599
goto end;
1016
goto fallback;
600
1017
}
601
1018
proc->buffer_size += BUFFER_SIZE;
602
1019
}
605
1022
BUFFER_SIZE);
606
1023
if(ret < 0){
607
1024
/* Read error from this process; ignore the error */
1025
proc = proc->next;
608
1026
continue;
609
1027
}
610
1028
if(ret == 0){
615
1033
}
616
1034
}
617
1035
}
618
if(process_list == NULL){
619
fprintf(stderr, "All plugin processes failed, exiting\n");
620
exitstatus = EXIT_FAILURE;
1036
1037
1038
fallback:
1039
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1041
/* Fallback if all plugins failed, none are found or an error
1042
occured */
1043
bool bret;
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1045
char *passwordbuffer = getpass("Password: ");
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);
1053
if(not bret){
1054
perror("print_out_password");
1055
exitstatus = EXIT_FAILURE;
1056
}
621
1057
}
622
1058
623
end:
624
1059
/* Restore old signal handler */
625
sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
if(ret == -1){
1062
perror("sigaction");
1063
exitstatus = EXIT_FAILURE;
1064
}
626
1065
627
/* Free the plugin list */
628
for(plugin *next; plugin_list != NULL; plugin_list = next){
629
next = plugin_list->next;
630
free(plugin_list->argv);
631
free(plugin_list);
1066
if(custom_argv != NULL){
1067
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1068
free(*arg);
1069
}
1070
free(custom_argv);
632
1071
}
633
1072
634
1073
if(dir != NULL){
635
1074
closedir(dir);
636
1075
}
637
1076
638
/* Free the process list and kill the processes */
639
for(process *next; process_list != NULL; process_list = next){
640
next = process_list->next;
641
close(process_list->fd);
642
kill(process_list->pid, SIGTERM);
643
free(process_list->buffer);
644
free(process_list);
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
}
1086
}
645
1087
}
646
1088
647
1089
/* Wait for any remaining child processes to terminate */
652
1094
perror("wait");
653
1095
}
654
1096
1097
free_plugin_list();
1098
1099
free(plugindir);
1100
free(argfile);
1101
655
1102
return exitstatus;
656
1103
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0