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- Committer: Björn Påhlsson
- Date: 2008-08-14 01:32:34 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 75.
- Revision ID: belorn@braxen-20080814013234-qs0s608s3gxwb5t7
changed from using strtok to strsep
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- 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
mandos-client.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
53
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
66
68
67
#define BUFFER_SIZE 256
69
68
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
73
const char *argp_program_version = "plugin-runner " VERSION;
69
const char *argp_program_version = "mandos-client 1.0";
74
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
71
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
78
char **argv;
79
int argc;
80
char **environ;
81
int envc;
82
bool disabled;
72
struct process;
83
73
84
/* Variables used for running processes*/
74
typedef struct process{
85
75
pid_t pid;
86
76
int fd;
87
77
char *buffer;
88
78
size_t buffer_size;
89
79
size_t buffer_length;
90
80
bool eof;
91
volatile bool completed;
92
volatile int status;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
93
91
struct plugin *next;
94
92
} plugin;
95
93
96
static plugin *plugin_list = NULL;
97
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
96
if ((p->name == name)
104
97
or (p->name and name and (strcmp(p->name, name) == 0))){
105
98
return p;
108
101
/* Create a new plugin */
109
102
plugin *new_plugin = malloc(sizeof(plugin));
110
103
if (new_plugin == NULL){
111
return NULL;
112
}
113
char *copy_name = NULL;
114
if(name != NULL){
115
copy_name = strdup(name);
116
if(copy_name == NULL){
117
return NULL;
118
}
119
}
120
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
125
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
126
108
new_plugin->argv = malloc(sizeof(char *) * 2);
127
109
if (new_plugin->argv == NULL){
128
free(copy_name);
129
free(new_plugin);
130
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
131
112
}
132
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
133
114
new_plugin->argv[1] = NULL;
134
135
new_plugin->environ = malloc(sizeof(char *));
136
if(new_plugin->environ == NULL){
137
free(copy_name);
138
free(new_plugin->argv);
139
free(new_plugin);
140
return NULL;
141
}
142
new_plugin->environ[0] = NULL;
143
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
144
118
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
146
120
return new_plugin;
147
121
}
148
122
149
/* Helper function for add_argument and add_environment */
150
static bool add_to_char_array(const char *new, char ***array,
151
int *len){
152
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
155
/* Malloc check */
156
if(*array == NULL){
157
return false;
158
}
159
/* Make a copy of the new string */
160
char *copy = strdup(new);
161
if(copy == NULL){
162
return false;
163
}
164
/* Insert the copy */
165
(*array)[*len] = copy;
166
(*len)++;
167
/* Add a new terminating NULL pointer to the last element */
168
(*array)[*len] = NULL;
169
return true;
170
}
171
172
/* Add to a plugin's argument vector */
173
static bool add_argument(plugin *p, const char *arg){
174
if(p == NULL){
175
return false;
176
}
177
return add_to_char_array(arg, &(p->argv), &(p->argc));
178
}
179
180
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
182
if(p == NULL){
183
return false;
184
}
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
191
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
194
return false;
195
}
196
*e = new;
197
strcpy(*e, def);
198
}
199
return true;
200
}
201
}
202
return add_to_char_array(def, &(p->environ), &(p->envc));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
203
132
}
204
133
205
134
/*
207
136
* Descriptor Flags".
208
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
138
*/
210
static int set_cloexec_flag(int fd){
139
static int set_cloexec_flag(int fd)
140
{
211
141
int ret = fcntl(fd, F_GETFD, 0);
212
142
/* If reading the flags failed, return error indication now. */
213
143
if(ret < 0){
217
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
148
}
219
149
150
process *process_list = NULL;
220
151
221
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
222
153
status. */
223
static void handle_sigchld(__attribute__((unused)) int sig){
224
while(true){
225
plugin *proc = plugin_list;
226
int status;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
228
if(pid == 0){
229
/* Only still running child processes */
230
break;
231
}
232
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
235
}
236
/* No child processes */
237
break;
238
}
239
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
242
proc = proc->next;
243
}
244
if(proc == NULL){
245
/* Process not found in process list */
246
continue;
247
}
248
proc->status = status;
249
proc->completed = true;
250
}
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
251
171
}
252
172
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
173
bool print_out_password(const char *buffer, size_t length){
255
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
256
178
for(size_t written = 0; written < length; written += (size_t)ret){
257
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
180
length - written));
263
185
return true;
264
186
}
265
187
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
268
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
270
free(*arg);
271
}
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
274
free(*env);
275
}
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
278
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
283
} else {
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
288
break;
289
}
290
}
291
}
292
293
free(plugin_node);
294
}
295
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
299
}
300
}
301
302
188
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
305
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
306
190
size_t d_name_len;
307
191
DIR *dir = NULL;
308
192
struct dirent *dirst;
316
200
struct sigaction old_sigchld_action;
317
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
318
202
.sa_flags = SA_NOCLDSTOP };
319
char **custom_argv = NULL;
320
int custom_argc = 0;
321
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
322
206
/* Establish a signal handler */
323
207
sigemptyset(&sigchld_action.sa_mask);
324
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
325
if(ret == -1){
209
if(ret < 0){
326
210
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
328
goto fallback;
211
exit(EXIT_FAILURE);
329
212
}
330
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
331
if(ret == -1){
214
if(ret < 0){
332
215
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
334
goto fallback;
216
exit(EXIT_FAILURE);
335
217
}
336
218
337
219
/* The options we understand. */
339
221
{ .name = "global-options", .key = 'g',
340
222
.arg = "OPTION[,OPTION[,...]]",
341
223
.doc = "Options passed to all plugins" },
342
{ .name = "global-env", .key = 'G',
343
.arg = "VAR=value",
344
.doc = "Environment variable passed to all plugins" },
345
224
{ .name = "options-for", .key = 'o',
346
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
347
226
.doc = "Options passed only to specified plugin" },
348
{ .name = "env-for", .key = 'E',
349
.arg = "PLUGIN:ENV=value",
350
.doc = "Environment variable passed to specified plugin" },
351
227
{ .name = "disable", .key = 'd',
352
228
.arg = "PLUGIN",
353
229
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
355
.arg = "PLUGIN",
356
.doc = "Enable a specific plugin", .group = 1 },
357
230
{ .name = "plugin-dir", .key = 128,
358
231
.arg = "DIRECTORY",
359
232
.doc = "Specify a different plugin directory", .group = 2 },
360
{ .name = "config-file", .key = 129,
361
.arg = "FILE",
362
.doc = "Specify a different configuration file", .group = 2 },
363
{ .name = "userid", .key = 130,
364
.arg = "ID", .flags = 0,
365
.doc = "User ID the plugins will run as", .group = 3 },
366
{ .name = "groupid", .key = 131,
367
.arg = "ID", .flags = 0,
368
.doc = "Group ID the plugins will run as", .group = 3 },
369
{ .name = "debug", .key = 132,
370
.doc = "Debug mode", .group = 4 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
371
241
{ .name = NULL }
372
242
};
373
243
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
376
248
switch (key) {
377
case 'g': /* --global-options */
249
case 'g':
378
250
if (arg != NULL){
379
251
char *p;
380
252
while((p = strsep(&arg, ",")) != NULL){
381
if(p[0] == '\0'){
253
if(strcmp(p, "") == 0){
382
254
continue;
383
255
}
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
return ARGP_ERR_UNKNOWN;
387
}
256
addargument(getplugin(NULL, plugins), p);
388
257
}
389
258
}
390
259
break;
391
case 'G': /* --global-env */
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
397
}
398
break;
399
case 'o': /* --options-for */
260
case 'o':
400
261
if (arg != NULL){
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
403
264
break;
404
265
}
405
266
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
407
break;
408
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
417
}
418
}
419
}
420
break;
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
{
426
char *envdef = strchr(arg, ':');
427
if(envdef == NULL){
428
break;
429
}
430
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
433
}
434
}
435
break;
436
case 'd': /* --disable */
437
if (arg != NULL){
438
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
441
}
442
p->disabled = true;
443
}
444
break;
445
case 'e': /* --enable */
446
if (arg != NULL){
447
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
450
}
451
p->disabled = false;
452
}
453
break;
454
case 128: /* --plugin-dir */
455
free(plugindir);
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
break;
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
463
break;
464
case 130: /* --userid */
267
if(strcmp(opt, "") == 0){
268
break;
269
}
270
if(opt != NULL){
271
char *p;
272
while((p = strsep(&opt, ",")) != NULL){
273
if(strcmp(p, "") == 0){
274
continue;
275
}
276
addargument(getplugin(name, plugins), p);
277
}
278
}
279
}
280
break;
281
case 'd':
282
if (arg != NULL){
283
getplugin(arg, plugins)->disabled = true;
284
}
285
break;
286
case 128:
287
plugindir = arg;
288
break;
289
case 129:
465
290
uid = (uid_t)strtol(arg, NULL, 10);
466
291
break;
467
case 131: /* --groupid */
292
case 130:
468
293
gid = (gid_t)strtol(arg, NULL, 10);
469
294
break;
470
case 132: /* --debug */
295
case 131:
471
296
debug = true;
472
297
break;
473
298
case ARGP_KEY_ARG:
474
/* Cryptsetup always passes an argument, which is an empty
475
string if "none" was specified in /etc/crypttab. So if
476
argument was empty, we ignore it silently. */
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
}
480
break;
481
case ARGP_KEY_END:
482
break;
483
default:
484
return ARGP_ERR_UNKNOWN;
485
}
486
return 0;
487
}
488
489
/* This option parser is the same as parse_opt() above, except it
490
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
495
case 'g': /* --global-options */
496
case 'G': /* --global-env */
497
case 'o': /* --options-for */
498
case 'E': /* --env-for */
499
case 'd': /* --disable */
500
case 'e': /* --enable */
501
case 128: /* --plugin-dir */
502
break;
503
case 129: /* --config-file */
504
free(argfile);
505
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
break;
516
default:
517
return ARGP_ERR_UNKNOWN;
518
}
519
return 0;
520
}
521
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
300
argp_usage (state);
301
}
302
plus_options = arg;
303
break;
304
case ARGP_KEY_END:
305
break;
306
default:
307
return ARGP_ERR_UNKNOWN;
308
}
309
return 0;
310
}
311
312
plugin *plugin_list = NULL;
313
314
struct argp argp = { .options = options, .parser = parse_opt,
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
525
316
.doc = "Mandos plugin runner -- Run plugins" };
526
317
527
/* Parse using the parse_opt_config_file in order to get the custom
528
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
530
319
if (ret == ARGP_ERR_UNKNOWN){
531
320
fprintf(stderr, "Unknown error while parsing arguments\n");
532
321
exitstatus = EXIT_FAILURE;
533
goto fallback;
322
goto end;
534
323
}
535
324
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
540
if (argfile == NULL){
541
conffp = fopen(AFILE, "r");
542
} else {
543
conffp = fopen(argfile, "r");
544
}
545
if(conffp != NULL){
546
char *org_line = NULL;
547
char *p, *arg, *new_arg, *line;
548
size_t size = 0;
549
ssize_t sret;
550
const char whitespace_delims[] = " \r\t\f\v\n";
551
const char comment_delim[] = "#";
552
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
325
if(plus_options){
326
/* This is a mangled argument in the form of
327
"+--option+--other-option=parameter+--yet-another-option", etc */
328
/* Make new argc and argv vars, and call argp_parse() again. */
329
plus_options++; /* skip the first '+' character */
330
const char delims[] = "+";
331
char *arg;
332
int new_argc = 1;
333
plus_argv = malloc(sizeof(char*) * 2);
334
if(plus_argv == NULL){
556
335
perror("malloc");
557
336
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
565
while(true){
566
sret = getline(&org_line, &size, conffp);
567
if(sret == -1){
568
break;
569
}
570
571
line = org_line;
572
arg = strsep(&line, comment_delim);
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
574
if(p[0] == '\0'){
575
continue;
576
}
577
new_arg = strdup(p);
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
596
}
597
}
598
free(org_line);
599
} else {
600
/* Check for harmful errors and go to fallback. Other errors might
601
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
605
goto fallback;
606
}
607
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
610
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
337
goto end;
338
}
339
plus_argv[0] = argv[0];
340
plus_argv[1] = NULL;
341
342
while((arg = strsep(&plus_options, delims)) != NULL){
343
new_argc++;
344
plus_argv = realloc(plus_argv, sizeof(char *)
345
* ((unsigned int) new_argc + 1));
346
if(plus_argv == NULL){
347
perror("realloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
plus_argv[new_argc-1] = arg;
352
plus_argv[new_argc] = NULL;
353
}
354
355
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
613
356
if (ret == ARGP_ERR_UNKNOWN){
614
357
fprintf(stderr, "Unknown error while parsing arguments\n");
615
358
exitstatus = EXIT_FAILURE;
616
goto fallback;
359
goto end;
617
360
}
618
361
}
619
362
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
629
363
if(debug){
630
364
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
365
fprintf(stderr, "Plugin: %s has %d arguments\n",
633
367
for(char **a = p->argv; *a != NULL; a++){
634
368
fprintf(stderr, "\tArg: %s\n", *a);
635
369
}
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
637
for(char **a = p->environ; *a != NULL; a++){
638
fprintf(stderr, "\t%s\n", *a);
639
}
640
370
}
641
371
}
642
372
643
/* Strip permissions down to nobody */
644
373
ret = setuid(uid);
645
374
if (ret == -1){
646
375
perror("setuid");
647
}
376
}
377
648
378
setgid(gid);
649
379
if (ret == -1){
650
380
perror("setgid");
651
381
}
652
382
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
383
dir = opendir(plugindir);
659
384
if(dir == NULL){
660
385
perror("Could not open plugin dir");
661
386
exitstatus = EXIT_FAILURE;
662
goto fallback;
387
goto end;
663
388
}
664
389
665
390
/* Set the FD_CLOEXEC flag on the directory, if possible */
670
395
if(ret < 0){
671
396
perror("set_cloexec_flag");
672
397
exitstatus = EXIT_FAILURE;
673
goto fallback;
398
goto end;
674
399
}
675
400
}
676
401
}
677
402
678
403
FD_ZERO(&rfds_all);
679
404
680
/* Read and execute any executable in the plugin directory*/
681
405
while(true){
682
406
dirst = readdir(dir);
683
407
684
/* All directory entries have been processed */
408
// All directory entries have been processed
685
409
if(dirst == NULL){
686
410
if (errno == EBADF){
687
411
perror("readdir");
688
412
exitstatus = EXIT_FAILURE;
689
goto fallback;
413
goto end;
690
414
}
691
415
break;
692
416
}
693
417
694
418
d_name_len = strlen(dirst->d_name);
695
419
696
/* Ignore dotfiles, backup files and other junk */
420
// Ignore dotfiles, backup files and other junk
697
421
{
698
422
bool bad_name = false;
699
423
701
425
702
426
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
427
".dpkg-old",
704
".dpkg-bak",
705
428
".dpkg-divert", NULL };
706
429
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
430
size_t pre_len = strlen(*pre);
715
438
break;
716
439
}
717
440
}
441
718
442
if(bad_name){
719
443
continue;
720
444
}
445
721
446
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
447
size_t suf_len = strlen(*suf);
723
448
if((d_name_len >= suf_len)
736
461
continue;
737
462
}
738
463
}
739
740
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
746
if(ret < 0){
747
perror("asprintf");
464
465
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
466
if (filename == NULL){
467
perror("malloc");
748
468
continue;
749
469
}
470
strcpy(filename, plugindir); /* Spurious warning */
471
strcat(filename, "/"); /* Spurious warning */
472
strcat(filename, dirst->d_name); /* Spurious warning */
750
473
751
474
ret = stat(filename, &st);
752
475
if (ret == -1){
754
477
free(filename);
755
478
continue;
756
479
}
757
758
/* Ignore non-executable files */
480
759
481
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
482
if(debug){
761
483
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
486
free(filename);
765
487
continue;
766
488
}
767
768
plugin *p = getplugin(dirst->d_name);
769
if(p == NULL){
770
perror("getplugin");
771
free(filename);
772
continue;
773
}
774
if(p->disabled){
489
if(getplugin(dirst->d_name, &plugin_list)->disabled){
775
490
if(debug){
776
491
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
492
dirst->d_name);
779
494
free(filename);
780
495
continue;
781
496
}
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
782
498
{
783
499
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
785
if(g != NULL){
786
for(char **a = g->argv + 1; *a != NULL; a++){
787
if(not add_argument(p, *a)){
788
perror("add_argument");
789
}
790
}
791
/* Add global environment variables */
792
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
794
perror("add_environment");
795
}
796
}
797
}
798
}
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
802
if(p->environ[0] != NULL){
803
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
805
perror("add_environment");
806
}
807
}
808
}
809
810
int pipefd[2];
500
plugin *g = getplugin(NULL, &plugin_list);
501
for(char **a = g->argv + 1; *a != NULL; a++){
502
addargument(p, *a);
503
}
504
}
505
int pipefd[2];
811
506
ret = pipe(pipefd);
812
507
if (ret == -1){
813
508
perror("pipe");
814
509
exitstatus = EXIT_FAILURE;
815
goto fallback;
510
goto end;
816
511
}
817
/* Ask OS to automatic close the pipe on exec */
818
512
ret = set_cloexec_flag(pipefd[0]);
819
513
if(ret < 0){
820
514
perror("set_cloexec_flag");
821
515
exitstatus = EXIT_FAILURE;
822
goto fallback;
516
goto end;
823
517
}
824
518
ret = set_cloexec_flag(pipefd[1]);
825
519
if(ret < 0){
826
520
perror("set_cloexec_flag");
827
521
exitstatus = EXIT_FAILURE;
828
goto fallback;
522
goto end;
829
523
}
830
524
/* Block SIGCHLD until process is safely in process list */
831
525
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
832
526
if(ret < 0){
833
527
perror("sigprocmask");
834
528
exitstatus = EXIT_FAILURE;
835
goto fallback;
529
goto end;
836
530
}
837
/* Starting a new process to be watched */
531
// Starting a new process to be watched
838
532
pid_t pid = fork();
839
533
if(pid == -1){
840
534
perror("fork");
841
535
exitstatus = EXIT_FAILURE;
842
goto fallback;
536
goto end;
843
537
}
844
538
if(pid == 0){
845
539
/* this is the child process */
848
542
perror("sigaction");
849
543
_exit(EXIT_FAILURE);
850
544
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
546
if(ret < 0){
853
547
perror("sigprocmask");
854
548
_exit(EXIT_FAILURE);
855
549
}
856
550
857
551
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
552
if(ret == -1){
859
553
perror("dup2");
865
559
above and must now close it manually here. */
866
560
closedir(dir);
867
561
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
562
if(execv(filename, p->argv) < 0){
563
perror("execv");
564
_exit(EXIT_FAILURE);
878
565
}
879
566
/* no return */
880
567
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
568
/* parent process */
883
569
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
570
close(pipefd[1]); /* close unused write end of pipe */
571
process *new_process = malloc(sizeof(process));
572
if (new_process == NULL){
573
perror("malloc");
887
574
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
575
if(ret < 0){
889
perror("sigprocmask");
576
perror("sigprocmask");
890
577
}
891
578
exitstatus = EXIT_FAILURE;
892
goto fallback;
579
goto end;
893
580
}
894
581
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
582
*new_process = (struct process){ .pid = pid,
583
.fd = pipefd[0],
584
.next = process_list };
585
// List handling
586
process_list = new_process;
898
587
/* Unblock SIGCHLD so signal handler can be run if this process
899
588
has already completed */
900
589
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
590
if(ret < 0){
902
591
perror("sigprocmask");
903
592
exitstatus = EXIT_FAILURE;
904
goto fallback;
905
}
906
907
FD_SET(new_plugin->fd, &rfds_all);
908
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
911
}
593
goto end;
594
}
595
596
FD_SET(new_process->fd, &rfds_all);
597
598
if (maxfd < new_process->fd){
599
maxfd = new_process->fd;
600
}
601
602
}
603
604
/* Free the plugin list */
605
for(plugin *next; plugin_list != NULL; plugin_list = next){
606
next = plugin_list->next;
607
free(plugin_list->argv);
608
free(plugin_list);
912
609
}
913
610
914
611
closedir(dir);
915
612
dir = NULL;
916
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
if(p->pid != 0){
919
break;
920
}
921
if(p->next == NULL){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
923
" directory?\n");
924
free_plugin_list();
925
}
613
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
616
" directory?\n");
617
process_list = NULL;
926
618
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
619
while(process_list){
930
620
fd_set rfds = rfds_all;
931
621
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
622
if (select_ret == -1){
933
623
perror("select");
934
624
exitstatus = EXIT_FAILURE;
935
goto fallback;
625
goto end;
936
626
}
937
627
/* OK, now either a process completed, or something can be read
938
628
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
629
for(process *proc = process_list; proc ; proc = proc->next){
940
630
/* Is this process completely done? */
941
631
if(proc->eof and proc->completed){
942
632
/* Only accept the plugin output if it exited cleanly */
943
633
if(not WIFEXITED(proc->status)
944
634
or WEXITSTATUS(proc->status) != 0){
945
635
/* Bad exit by plugin */
946
947
636
if(debug){
948
637
if(WIFEXITED(proc->status)){
949
638
fprintf(stderr, "Plugin %u exited with status %d\n",
958
647
(unsigned int) (proc->pid));
959
648
}
960
649
}
961
962
650
/* Remove the plugin */
963
651
FD_CLR(proc->fd, &rfds_all);
964
965
652
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
654
if(ret < 0){
968
655
perror("sigprocmask");
969
656
exitstatus = EXIT_FAILURE;
970
goto fallback;
971
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
657
goto end;
658
}
659
/* Delete this process entry from the list */
660
if(process_list == proc){
661
/* First one - simple */
662
process_list = proc->next;
663
} else {
664
/* Second one or later */
665
for(process *p = process_list; p != NULL; p = p->next){
666
if(p->next == proc){
667
p->next = proc->next;
668
break;
669
}
670
}
671
}
977
672
/* We are done modifying process list, so unblock signal */
978
673
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
674
NULL);
980
675
if(ret < 0){
981
676
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
677
}
678
free(proc->buffer);
679
free(proc);
680
/* We deleted this process from the list, so we can't go
681
proc->next. Therefore, start over from the beginning of
682
the process list */
683
break;
991
684
}
992
993
685
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
686
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
688
if(not bret){
998
689
perror("print_out_password");
999
690
exitstatus = EXIT_FAILURE;
1000
691
}
1001
goto fallback;
692
goto end;
1002
693
}
1003
1004
694
/* This process has not completed. Does it have any output? */
1005
695
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
696
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
697
continue;
1009
698
}
1010
699
/* Before reading, make the process' data buffer large enough */
1014
703
if (proc->buffer == NULL){
1015
704
perror("malloc");
1016
705
exitstatus = EXIT_FAILURE;
1017
goto fallback;
706
goto end;
1018
707
}
1019
708
proc->buffer_size += BUFFER_SIZE;
1020
709
}
1023
712
BUFFER_SIZE);
1024
713
if(ret < 0){
1025
714
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
715
continue;
1028
716
}
1029
717
if(ret == 0){
1036
724
}
1037
725
1038
726
1039
fallback:
727
end:
1040
728
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
1044
731
bool bret;
1045
732
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
733
char *passwordbuffer = getpass("Password: ");
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
len--;
1052
}
1053
bret = print_out_password(passwordbuffer, len);
734
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
735
if(not bret){
1055
736
perror("print_out_password");
1056
737
exitstatus = EXIT_FAILURE;
738
goto end;
1057
739
}
1058
740
}
1059
741
1060
742
/* Restore old signal handler */
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
if(ret == -1){
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1065
}
1066
1067
if(custom_argv != NULL){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1069
free(*arg);
1070
}
1071
free(custom_argv);
743
sigaction(SIGCHLD, &old_sigchld_action, NULL);
744
745
free(plus_argv);
746
747
/* Free the plugin list */
748
for(plugin *next; plugin_list != NULL; plugin_list = next){
749
next = plugin_list->next;
750
free(plugin_list->argv);
751
free(plugin_list);
1072
752
}
1073
753
1074
754
if(dir != NULL){
1075
755
closedir(dir);
1076
756
}
1077
757
1078
/* Kill the processes */
1079
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
if(p->pid != 0){
1081
close(p->fd);
1082
ret = kill(p->pid, SIGTERM);
1083
if(ret == -1 and errno != ESRCH){
1084
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1086
}
758
/* Free the process list and kill the processes */
759
for(process *next; process_list != NULL; process_list = next){
760
next = process_list->next;
761
close(process_list->fd);
762
ret = kill(process_list->pid, SIGTERM);
763
if(ret == -1 and errno != ESRCH){
764
/* set-uid proccesses migth not get closed */
765
perror("kill");
1087
766
}
767
free(process_list->buffer);
768
free(process_list);
1088
769
}
1089
770
1090
771
/* Wait for any remaining child processes to terminate */
1095
776
perror("wait");
1096
777
}
1097
778
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
779
return exitstatus;
1104
780
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0