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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:47:22 UTC
- mfrom: (76 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815204722-yvylhrvub57csggz
merge + minor adjustments
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2007-2008 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(), getline(),
25
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
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, fileno(), fprintf(),
31
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), 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(), asprintf() */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, 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
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;
68
#define ARGFILE "/conf/conf.d/mandos/plugins.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
73
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
72
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;
73
struct process;
82
74
83
/* Variables used for running processes*/
75
typedef struct process{
84
76
pid_t pid;
85
77
int fd;
86
78
char *buffer;
87
79
size_t buffer_size;
88
80
size_t buffer_length;
89
81
bool eof;
90
volatile bool completed;
91
volatile int status;
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;
92
92
struct plugin *next;
93
93
} plugin;
94
94
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){
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
102
97
if ((p->name == name)
103
98
or (p->name and name and (strcmp(p->name, name) == 0))){
104
99
return p;
107
102
/* Create a new plugin */
108
103
plugin *new_plugin = malloc(sizeof(plugin));
109
104
if (new_plugin == NULL){
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
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
125
109
new_plugin->argv = malloc(sizeof(char *) * 2);
126
110
if (new_plugin->argv == NULL){
127
free(copy_name);
128
free(new_plugin);
129
return NULL;
111
perror("malloc");
112
exit(EXIT_FAILURE);
130
113
}
131
new_plugin->argv[0] = copy_name;
114
new_plugin->argv[0] = name;
132
115
new_plugin->argv[1] = NULL;
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
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
143
119
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
120
*plugin_list = new_plugin;
145
121
return new_plugin;
146
122
}
147
123
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));
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;
202
133
}
203
134
204
135
/*
206
137
* Descriptor Flags".
207
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
208
139
*/
209
static int set_cloexec_flag(int fd){
140
static int set_cloexec_flag(int fd)
141
{
210
142
int ret = fcntl(fd, F_GETFD, 0);
211
143
/* If reading the flags failed, return error indication now. */
212
144
if(ret < 0){
216
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
217
149
}
218
150
151
process *process_list = NULL;
219
152
220
/* Mark processes as completed when they exit, and save their exit
153
/* Mark a process as completed when it exits, and save its exit
221
154
status. */
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
}
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;
250
172
}
251
173
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
174
bool print_out_password(const char *buffer, size_t length){
254
175
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
255
179
for(size_t written = 0; written < length; written += (size_t)ret){
256
180
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
181
length - written));
262
186
return true;
263
187
}
264
188
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);
189
char ** addcustomargument(char **argv, int *argc, char *arg){
277
190
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
}
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
289
196
}
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
}
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;
299
209
}
300
210
301
211
int main(int argc, char *argv[]){
302
char *plugindir = NULL;
303
char *argfile = NULL;
212
const char *plugindir = "/lib/mandos/plugins.d";
213
const char *argfile = ARGFILE;
304
214
FILE *conffp;
305
215
size_t d_name_len;
306
216
DIR *dir = NULL;
321
231
/* Establish a signal handler */
322
232
sigemptyset(&sigchld_action.sa_mask);
323
233
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
324
if(ret == -1){
234
if(ret < 0){
325
235
perror("sigaddset");
326
exitstatus = EXIT_FAILURE;
327
goto fallback;
236
exit(EXIT_FAILURE);
328
237
}
329
238
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
330
if(ret == -1){
239
if(ret < 0){
331
240
perror("sigaction");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
241
exit(EXIT_FAILURE);
334
242
}
335
243
336
244
/* The options we understand. */
338
246
{ .name = "global-options", .key = 'g',
339
247
.arg = "OPTION[,OPTION[,...]]",
340
248
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
342
.arg = "VAR=value",
343
.doc = "Environment variable passed to all plugins" },
344
249
{ .name = "options-for", .key = 'o',
345
250
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
251
.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" },
350
252
{ .name = "disable", .key = 'd',
351
253
.arg = "PLUGIN",
352
254
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
255
{ .name = "plugin-dir", .key = 128,
357
256
.arg = "DIRECTORY",
358
257
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
370
266
{ .name = NULL }
371
267
};
372
268
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
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;
375
273
switch (key) {
376
case 'g': /* --global-options */
274
case 'g':
377
275
if (arg != NULL){
378
276
char *p;
379
277
while((p = strsep(&arg, ",")) != NULL){
380
278
if(p[0] == '\0'){
381
279
continue;
382
280
}
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
386
}
281
addargument(getplugin(NULL, plugins), p);
387
282
}
388
283
}
389
284
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 */
285
case 'o':
399
286
if (arg != NULL){
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
402
289
break;
403
290
}
404
291
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 */
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:
464
315
uid = (uid_t)strtol(arg, NULL, 10);
465
316
break;
466
case 131: /* --groupid */
317
case 130:
467
318
gid = (gid_t)strtol(arg, NULL, 10);
468
319
break;
469
case 132: /* --debug */
320
case 131:
470
321
debug = true;
471
322
break;
472
323
case ARGP_KEY_ARG:
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 = "",
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]",
524
338
.doc = "Mandos plugin runner -- Run plugins" };
525
339
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);
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
341
if (ret == ARGP_ERR_UNKNOWN){
530
342
fprintf(stderr, "Unknown error while parsing arguments\n");
531
343
exitstatus = EXIT_FAILURE;
532
goto fallback;
344
goto end;
533
345
}
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
}
346
347
conffp = fopen(argfile, "r");
544
348
if(conffp != NULL){
545
349
char *org_line = NULL;
546
char *p, *arg, *new_arg, *line;
547
350
size_t size = 0;
548
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
549
353
const char whitespace_delims[] = " \r\t\f\v\n";
550
354
const char comment_delim[] = "#";
551
355
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
356
while(true){
565
357
sret = getline(&org_line, &size, conffp);
566
358
if(sret == -1){
574
366
continue;
575
367
}
576
368
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;
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
}
595
375
}
596
376
}
597
377
free(org_line);
598
} else {
378
} else{
599
379
/* Check for harmful errors and go to fallback. Other errors might
600
380
not affect opening plugins */
601
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
382
perror("fopen");
603
383
exitstatus = EXIT_FAILURE;
604
goto fallback;
384
goto end;
605
385
}
606
386
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
387
609
388
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
612
391
if (ret == ARGP_ERR_UNKNOWN){
613
392
fprintf(stderr, "Unknown error while parsing arguments\n");
614
393
exitstatus = EXIT_FAILURE;
615
goto fallback;
394
goto end;
616
395
}
617
396
}
618
397
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
628
398
if(debug){
629
399
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
400
fprintf(stderr, "Plugin: %s has %d arguments\n",
632
402
for(char **a = p->argv; *a != NULL; a++){
633
403
fprintf(stderr, "\tArg: %s\n", *a);
634
404
}
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
}
639
405
}
640
406
}
641
407
642
/* Strip permissions down to nobody */
643
408
ret = setuid(uid);
644
409
if (ret == -1){
645
410
perror("setuid");
646
}
411
}
412
647
413
setgid(gid);
648
414
if (ret == -1){
649
415
perror("setgid");
650
416
}
651
417
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
418
dir = opendir(plugindir);
658
419
if(dir == NULL){
659
420
perror("Could not open plugin dir");
660
421
exitstatus = EXIT_FAILURE;
661
goto fallback;
422
goto end;
662
423
}
663
424
664
425
/* Set the FD_CLOEXEC flag on the directory, if possible */
669
430
if(ret < 0){
670
431
perror("set_cloexec_flag");
671
432
exitstatus = EXIT_FAILURE;
672
goto fallback;
433
goto end;
673
434
}
674
435
}
675
436
}
676
437
677
438
FD_ZERO(&rfds_all);
678
439
679
/* Read and execute any executable in the plugin directory*/
680
440
while(true){
681
441
dirst = readdir(dir);
682
442
683
/* All directory entries have been processed */
443
// All directory entries have been processed
684
444
if(dirst == NULL){
685
445
if (errno == EBADF){
686
446
perror("readdir");
687
447
exitstatus = EXIT_FAILURE;
688
goto fallback;
448
goto end;
689
449
}
690
450
break;
691
451
}
692
452
693
453
d_name_len = strlen(dirst->d_name);
694
454
695
/* Ignore dotfiles, backup files and other junk */
455
// Ignore dotfiles, backup files and other junk
696
456
{
697
457
bool bad_name = false;
698
458
713
473
break;
714
474
}
715
475
}
476
716
477
if(bad_name){
717
478
continue;
718
479
}
480
719
481
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
482
size_t suf_len = strlen(*suf);
721
483
if((d_name_len >= suf_len)
734
496
continue;
735
497
}
736
498
}
737
738
char *filename;
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
744
if(ret < 0){
745
perror("asprintf");
499
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
502
perror("malloc");
746
503
continue;
747
504
}
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
748
508
749
509
ret = stat(filename, &st);
750
510
if (ret == -1){
752
512
free(filename);
753
513
continue;
754
514
}
755
756
/* Ignore non-executable files */
515
757
516
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
517
if(debug){
759
518
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
521
free(filename);
763
522
continue;
764
523
}
765
766
plugin *p = getplugin(dirst->d_name);
767
if(p == NULL){
768
perror("getplugin");
769
free(filename);
770
continue;
771
}
772
if(p->disabled){
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
773
525
if(debug){
774
526
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
775
527
dirst->d_name);
777
529
free(filename);
778
530
continue;
779
531
}
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
780
533
{
781
534
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
783
if(g != NULL){
784
for(char **a = g->argv + 1; *a != NULL; a++){
785
if(not add_argument(p, *a)){
786
perror("add_argument");
787
}
788
}
789
/* Add global environment variables */
790
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
792
perror("add_environment");
793
}
794
}
795
}
796
}
797
/* If this plugin has any environment variables, we will call
798
using execve and need to duplicate the environment from this
799
process, too. */
800
if(p->environ[0] != NULL){
801
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
803
perror("add_environment");
804
}
805
}
806
}
807
808
int pipefd[2];
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
537
addargument(p, *a);
538
}
539
}
540
int pipefd[2];
809
541
ret = pipe(pipefd);
810
542
if (ret == -1){
811
543
perror("pipe");
812
544
exitstatus = EXIT_FAILURE;
813
goto fallback;
545
goto end;
814
546
}
815
/* Ask OS to automatic close the pipe on exec */
816
547
ret = set_cloexec_flag(pipefd[0]);
817
548
if(ret < 0){
818
549
perror("set_cloexec_flag");
819
550
exitstatus = EXIT_FAILURE;
820
goto fallback;
551
goto end;
821
552
}
822
553
ret = set_cloexec_flag(pipefd[1]);
823
554
if(ret < 0){
824
555
perror("set_cloexec_flag");
825
556
exitstatus = EXIT_FAILURE;
826
goto fallback;
557
goto end;
827
558
}
828
559
/* Block SIGCHLD until process is safely in process list */
829
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
830
561
if(ret < 0){
831
562
perror("sigprocmask");
832
563
exitstatus = EXIT_FAILURE;
833
goto fallback;
564
goto end;
834
565
}
835
/* Starting a new process to be watched */
566
// Starting a new process to be watched
836
567
pid_t pid = fork();
837
568
if(pid == -1){
838
569
perror("fork");
839
570
exitstatus = EXIT_FAILURE;
840
goto fallback;
571
goto end;
841
572
}
842
573
if(pid == 0){
843
574
/* this is the child process */
846
577
perror("sigaction");
847
578
_exit(EXIT_FAILURE);
848
579
}
849
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
850
581
if(ret < 0){
851
582
perror("sigprocmask");
852
583
_exit(EXIT_FAILURE);
853
584
}
854
585
855
586
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
856
587
if(ret == -1){
857
588
perror("dup2");
863
594
above and must now close it manually here. */
864
595
closedir(dir);
865
596
}
866
if(p->environ[0] == NULL){
867
if(execv(filename, p->argv) < 0){
868
perror("execv");
869
_exit(EXIT_FAILURE);
870
}
871
} else {
872
if(execve(filename, p->argv, p->environ) < 0){
873
perror("execve");
874
_exit(EXIT_FAILURE);
875
}
597
if(execv(filename, p->argv) < 0){
598
perror("execv");
599
_exit(EXIT_FAILURE);
876
600
}
877
601
/* no return */
878
602
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
603
/* parent process */
881
604
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
608
perror("malloc");
885
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
610
if(ret < 0){
887
perror("sigprocmask");
611
perror("sigprocmask");
888
612
}
889
613
exitstatus = EXIT_FAILURE;
890
goto fallback;
614
goto end;
891
615
}
892
616
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
617
*new_process = (struct process){ .pid = pid,
618
.fd = pipefd[0],
619
.next = process_list };
620
// List handling
621
process_list = new_process;
896
622
/* Unblock SIGCHLD so signal handler can be run if this process
897
623
has already completed */
898
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
899
625
if(ret < 0){
900
626
perror("sigprocmask");
901
627
exitstatus = EXIT_FAILURE;
902
goto fallback;
903
}
904
905
FD_SET(new_plugin->fd, &rfds_all);
906
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
909
}
628
goto end;
629
}
630
631
FD_SET(new_process->fd, &rfds_all);
632
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
635
}
636
637
}
638
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
643
free(plugin_list);
910
644
}
911
645
912
646
closedir(dir);
913
647
dir = NULL;
914
915
for(plugin *p = plugin_list; p != NULL; p = p->next){
916
if(p->pid != 0){
917
break;
918
}
919
if(p->next == NULL){
920
fprintf(stderr, "No plugin processes started. Incorrect plugin"
921
" directory?\n");
922
free_plugin_list();
923
}
648
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
651
" directory?\n");
652
process_list = NULL;
924
653
}
925
926
/* Main loop while running plugins exist */
927
while(plugin_list){
654
while(process_list){
928
655
fd_set rfds = rfds_all;
929
656
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
930
657
if (select_ret == -1){
931
658
perror("select");
932
659
exitstatus = EXIT_FAILURE;
933
goto fallback;
660
goto end;
934
661
}
935
662
/* OK, now either a process completed, or something can be read
936
663
from one of them */
937
for(plugin *proc = plugin_list; proc != NULL;){
664
for(process *proc = process_list; proc ; proc = proc->next){
938
665
/* Is this process completely done? */
939
666
if(proc->eof and proc->completed){
940
667
/* Only accept the plugin output if it exited cleanly */
941
668
if(not WIFEXITED(proc->status)
942
669
or WEXITSTATUS(proc->status) != 0){
943
670
/* Bad exit by plugin */
944
945
671
if(debug){
946
672
if(WIFEXITED(proc->status)){
947
673
fprintf(stderr, "Plugin %u exited with status %d\n",
956
682
(unsigned int) (proc->pid));
957
683
}
958
684
}
959
960
685
/* Remove the plugin */
961
686
FD_CLR(proc->fd, &rfds_all);
962
963
687
/* Block signal while modifying process_list */
964
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
965
689
if(ret < 0){
966
690
perror("sigprocmask");
967
691
exitstatus = EXIT_FAILURE;
968
goto fallback;
969
}
970
971
plugin *next_plugin = proc->next;
972
free_plugin(proc);
973
proc = next_plugin;
974
692
goto end;
693
}
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
698
} else {
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
701
if(p->next == proc){
702
p->next = proc->next;
703
break;
704
}
705
}
706
}
975
707
/* We are done modifying process list, so unblock signal */
976
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
709
NULL);
978
710
if(ret < 0){
979
711
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
continue;
712
}
713
free(proc->buffer);
714
free(proc);
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
717
the process list */
718
break;
989
719
}
990
991
720
/* This process exited nicely, so print its buffer */
992
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
721
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
995
723
if(not bret){
996
724
perror("print_out_password");
997
725
exitstatus = EXIT_FAILURE;
998
726
}
999
goto fallback;
727
goto end;
1000
728
}
1001
1002
729
/* This process has not completed. Does it have any output? */
1003
730
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
731
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
732
continue;
1007
733
}
1008
734
/* Before reading, make the process' data buffer large enough */
1012
738
if (proc->buffer == NULL){
1013
739
perror("malloc");
1014
740
exitstatus = EXIT_FAILURE;
1015
goto fallback;
741
goto end;
1016
742
}
1017
743
proc->buffer_size += BUFFER_SIZE;
1018
744
}
1021
747
BUFFER_SIZE);
1022
748
if(ret < 0){
1023
749
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
750
continue;
1026
751
}
1027
752
if(ret == 0){
1034
759
}
1035
760
1036
761
1037
fallback:
762
end:
1038
763
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1042
766
bool bret;
1043
767
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
768
char *passwordbuffer = getpass("Password: ");
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
770
if(not bret){
1053
771
perror("print_out_password");
1054
772
exitstatus = EXIT_FAILURE;
773
goto end;
1055
774
}
1056
775
}
1057
776
1058
777
/* Restore old signal handler */
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1063
}
1064
1065
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
free(*arg);
1068
}
1069
free(custom_argv);
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
779
780
free(custom_argv);
781
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
786
free(plugin_list);
1070
787
}
1071
788
1072
789
if(dir != NULL){
1073
790
closedir(dir);
1074
791
}
1075
792
1076
/* Kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
793
/* Free the process list and kill the processes */
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
800
perror("kill");
1085
801
}
802
free(process_list->buffer);
803
free(process_list);
1086
804
}
1087
805
1088
806
/* Wait for any remaining child processes to terminate */
1093
811
perror("wait");
1094
812
}
1095
813
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
1101
814
return exitstatus;
1102
815
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0