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- Committer: Teddy Hogeborn
- Date: 2008-08-10 20:35:01 UTC
- mfrom: (24.1.42 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080810203501-euh3qcf1nopilksm
Merge.
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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> /* strtok, 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){
255
ssize_t ret;
256
for(size_t written = 0; written < length; written += (size_t)ret){
173
bool print_out_password(const char *buffer, size_t length){
174
size_t ret;
175
for(size_t written = 0; written < length; written += ret){
257
176
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
177
length - written));
259
178
if(ret < 0){
263
182
return true;
264
183
}
265
184
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
185
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
305
FILE *conffp;
186
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
306
187
size_t d_name_len;
307
188
DIR *dir = NULL;
308
189
struct dirent *dirst;
316
197
struct sigaction old_sigchld_action;
317
198
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
318
199
.sa_flags = SA_NOCLDSTOP };
319
char **custom_argv = NULL;
320
int custom_argc = 0;
200
char *plus_options = NULL;
201
char **plus_argv = NULL;
321
202
322
203
/* Establish a signal handler */
323
204
sigemptyset(&sigchld_action.sa_mask);
324
205
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
325
if(ret == -1){
206
if(ret < 0){
326
207
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
328
goto fallback;
208
exit(EXIT_FAILURE);
329
209
}
330
210
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
331
if(ret == -1){
211
if(ret < 0){
332
212
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
334
goto fallback;
213
exit(EXIT_FAILURE);
335
214
}
336
215
337
216
/* The options we understand. */
339
218
{ .name = "global-options", .key = 'g',
340
219
.arg = "OPTION[,OPTION[,...]]",
341
220
.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
221
{ .name = "options-for", .key = 'o',
346
222
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
347
223
.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
224
{ .name = "disable", .key = 'd',
352
225
.arg = "PLUGIN",
353
226
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
355
.arg = "PLUGIN",
356
.doc = "Enable a specific plugin", .group = 1 },
357
227
{ .name = "plugin-dir", .key = 128,
358
228
.arg = "DIRECTORY",
359
229
.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 },
230
{ .name = "userid", .key = 129,
231
.arg = "ID", .flags = 0,
232
.doc = "User ID the plugins will run as", .group = 2 },
233
{ .name = "groupid", .key = 130,
234
.arg = "ID", .flags = 0,
235
.doc = "Group ID the plugins will run as", .group = 2 },
236
{ .name = "debug", .key = 131,
237
.doc = "Debug mode", .group = 3 },
371
238
{ .name = NULL }
372
239
};
373
240
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
241
error_t parse_opt (int key, char *arg, struct argp_state *state) {
242
/* Get the INPUT argument from `argp_parse', which we know is a
243
pointer to our plugin list pointer. */
244
plugin **plugins = state->input;
376
245
switch (key) {
377
case 'g': /* --global-options */
378
if (arg != NULL){
379
char *p;
380
while((p = strsep(&arg, ",")) != NULL){
381
if(p[0] == '\0'){
382
continue;
383
}
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
return ARGP_ERR_UNKNOWN;
387
}
388
}
389
}
390
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 */
400
if (arg != NULL){
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
403
break;
404
}
405
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 */
246
case 'g':
247
if (arg != NULL){
248
char *p = strtok(arg, ",");
249
do{
250
addargument(getplugin(NULL, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
break;
255
case 'o':
256
if (arg != NULL){
257
char *name = strtok(arg, ":");
258
char *p = strtok(NULL, ":");
259
if(p != NULL){
260
p = strtok(p, ",");
261
do{
262
addargument(getplugin(name, plugins), p);
263
p = strtok(NULL, ",");
264
} while (p != NULL);
265
}
266
}
267
break;
268
case 'd':
269
if (arg != NULL){
270
getplugin(arg, plugins)->disabled = true;
271
}
272
break;
273
case 128:
274
plugindir = arg;
275
break;
276
case 129:
465
277
uid = (uid_t)strtol(arg, NULL, 10);
466
278
break;
467
case 131: /* --groupid */
279
case 130:
468
280
gid = (gid_t)strtol(arg, NULL, 10);
469
281
break;
470
case 132: /* --debug */
282
case 131:
471
283
debug = true;
472
284
break;
473
285
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 = "",
286
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
287
argp_usage (state);
288
}
289
plus_options = arg;
290
break;
291
case ARGP_KEY_END:
292
break;
293
default:
294
return ARGP_ERR_UNKNOWN;
295
}
296
return 0;
297
}
298
299
plugin *plugin_list = NULL;
300
301
struct argp argp = { .options = options, .parser = parse_opt,
302
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
525
303
.doc = "Mandos plugin runner -- Run plugins" };
526
304
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);
305
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
530
306
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
307
fprintf(stderr, "Unkown error while parsing arguments\n");
532
308
exitstatus = EXIT_FAILURE;
533
goto fallback;
309
goto end;
534
310
}
535
311
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){
312
if(plus_options){
313
/* This is a mangled argument in the form of
314
"+--option+--other-option=parameter+--yet-another-option", etc */
315
/* Make new argc and argv vars, and call argp_parse() again. */
316
plus_options++; /* skip the first '+' character */
317
const char delims[] = "+";
318
char *arg;
319
int new_argc = 1;
320
plus_argv = malloc(sizeof(char*) * 2);
321
if(plus_argv == NULL){
556
322
perror("malloc");
557
323
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);
324
goto end;
325
}
326
plus_argv[0] = argv[0];
327
plus_argv[1] = NULL;
328
arg = strtok(plus_options, delims); /* Get first argument */
329
while(arg != NULL){
330
new_argc++;
331
plus_argv = realloc(plus_argv, sizeof(char *)
332
* ((unsigned int) new_argc + 1));
333
if(plus_argv == NULL){
334
perror("realloc");
335
exitstatus = EXIT_FAILURE;
336
goto end;
337
}
338
plus_argv[new_argc-1] = arg;
339
plus_argv[new_argc] = NULL;
340
arg = strtok(NULL, delims); /* Get next argument */
341
}
342
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
613
343
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
344
fprintf(stderr, "Unkown error while parsing arguments\n");
615
345
exitstatus = EXIT_FAILURE;
616
goto fallback;
346
goto end;
617
347
}
618
348
}
619
349
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
350
if(debug){
630
351
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
352
fprintf(stderr, "Plugin: %s has %d arguments\n",
633
354
for(char **a = p->argv; *a != NULL; a++){
634
355
fprintf(stderr, "\tArg: %s\n", *a);
635
356
}
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
357
}
641
358
}
642
359
643
/* Strip permissions down to nobody */
644
360
ret = setuid(uid);
645
361
if (ret == -1){
646
362
perror("setuid");
647
}
363
}
364
648
365
setgid(gid);
649
366
if (ret == -1){
650
367
perror("setgid");
651
368
}
652
369
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
370
dir = opendir(plugindir);
659
371
if(dir == NULL){
660
372
perror("Could not open plugin dir");
661
373
exitstatus = EXIT_FAILURE;
662
goto fallback;
374
goto end;
663
375
}
664
376
665
377
/* Set the FD_CLOEXEC flag on the directory, if possible */
670
382
if(ret < 0){
671
383
perror("set_cloexec_flag");
672
384
exitstatus = EXIT_FAILURE;
673
goto fallback;
385
goto end;
674
386
}
675
387
}
676
388
}
677
389
678
390
FD_ZERO(&rfds_all);
679
391
680
/* Read and execute any executable in the plugin directory*/
681
392
while(true){
682
393
dirst = readdir(dir);
683
394
684
/* All directory entries have been processed */
395
// All directory entries have been processed
685
396
if(dirst == NULL){
686
397
if (errno == EBADF){
687
398
perror("readdir");
688
399
exitstatus = EXIT_FAILURE;
689
goto fallback;
400
goto end;
690
401
}
691
402
break;
692
403
}
693
404
694
405
d_name_len = strlen(dirst->d_name);
695
406
696
/* Ignore dotfiles, backup files and other junk */
407
// Ignore dotfiles, backup files and other junk
697
408
{
698
409
bool bad_name = false;
699
410
701
412
702
413
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
414
".dpkg-old",
704
".dpkg-bak",
705
415
".dpkg-divert", NULL };
706
416
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
417
size_t pre_len = strlen(*pre);
715
425
break;
716
426
}
717
427
}
428
718
429
if(bad_name){
719
430
continue;
720
431
}
432
721
433
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
434
size_t suf_len = strlen(*suf);
723
435
if((d_name_len >= suf_len)
736
448
continue;
737
449
}
738
450
}
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");
748
continue;
749
}
451
452
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
453
if (filename == NULL){
454
perror("malloc");
455
exitstatus = EXIT_FAILURE;
456
goto end;
457
}
458
strcpy(filename, plugindir); /* Spurious warning */
459
strcat(filename, "/"); /* Spurious warning */
460
strcat(filename, dirst->d_name); /* Spurious warning */
750
461
751
462
ret = stat(filename, &st);
752
463
if (ret == -1){
753
464
perror("stat");
754
free(filename);
755
continue;
465
exitstatus = EXIT_FAILURE;
466
goto end;
756
467
}
757
758
/* Ignore non-executable files */
468
759
469
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
470
if(debug){
761
471
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
474
free(filename);
765
475
continue;
766
476
}
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){
477
if(getplugin(dirst->d_name, &plugin_list)->disabled){
775
478
if(debug){
776
479
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
480
dirst->d_name);
779
482
free(filename);
780
483
continue;
781
484
}
485
plugin *p = getplugin(dirst->d_name, &plugin_list);
782
486
{
783
487
/* 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];
488
plugin *g = getplugin(NULL, &plugin_list);
489
for(char **a = g->argv + 1; *a != NULL; a++){
490
addargument(p, *a);
491
}
492
}
493
int pipefd[2];
811
494
ret = pipe(pipefd);
812
495
if (ret == -1){
813
496
perror("pipe");
814
497
exitstatus = EXIT_FAILURE;
815
goto fallback;
498
goto end;
816
499
}
817
/* Ask OS to automatic close the pipe on exec */
818
500
ret = set_cloexec_flag(pipefd[0]);
819
501
if(ret < 0){
820
502
perror("set_cloexec_flag");
821
503
exitstatus = EXIT_FAILURE;
822
goto fallback;
504
goto end;
823
505
}
824
506
ret = set_cloexec_flag(pipefd[1]);
825
507
if(ret < 0){
826
508
perror("set_cloexec_flag");
827
509
exitstatus = EXIT_FAILURE;
828
goto fallback;
510
goto end;
829
511
}
830
512
/* Block SIGCHLD until process is safely in process list */
831
513
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
832
514
if(ret < 0){
833
515
perror("sigprocmask");
834
516
exitstatus = EXIT_FAILURE;
835
goto fallback;
517
goto end;
836
518
}
837
/* Starting a new process to be watched */
519
// Starting a new process to be watched
838
520
pid_t pid = fork();
839
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
842
goto fallback;
843
}
844
521
if(pid == 0){
845
522
/* this is the child process */
846
523
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
848
525
perror("sigaction");
849
526
_exit(EXIT_FAILURE);
850
527
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
528
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
529
if(ret < 0){
853
530
perror("sigprocmask");
854
531
_exit(EXIT_FAILURE);
855
532
}
856
533
857
534
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
535
if(ret == -1){
859
536
perror("dup2");
865
542
above and must now close it manually here. */
866
543
closedir(dir);
867
544
}
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
}
545
if(execv(filename, p->argv) < 0){
546
perror("execv");
547
_exit(EXIT_FAILURE);
878
548
}
879
549
/* no return */
880
550
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
551
/* parent process */
883
552
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
553
close(pipefd[1]); /* close unused write end of pipe */
554
process *new_process = malloc(sizeof(process));
555
if (new_process == NULL){
556
perror("malloc");
887
557
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
558
if(ret < 0){
889
perror("sigprocmask");
559
perror("sigprocmask");
890
560
}
891
561
exitstatus = EXIT_FAILURE;
892
goto fallback;
562
goto end;
893
563
}
894
564
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
565
*new_process = (struct process){ .pid = pid,
566
.fd = pipefd[0],
567
.next = process_list };
568
// List handling
569
process_list = new_process;
898
570
/* Unblock SIGCHLD so signal handler can be run if this process
899
571
has already completed */
900
572
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
573
if(ret < 0){
902
574
perror("sigprocmask");
903
575
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
}
576
goto end;
577
}
578
579
FD_SET(new_process->fd, &rfds_all);
580
581
if (maxfd < new_process->fd){
582
maxfd = new_process->fd;
583
}
584
585
}
586
587
/* Free the plugin list */
588
for(plugin *next; plugin_list != NULL; plugin_list = next){
589
next = plugin_list->next;
590
free(plugin_list->argv);
591
free(plugin_list);
912
592
}
913
593
914
594
closedir(dir);
915
595
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
}
596
597
if (process_list == NULL){
598
fprintf(stderr, "No plugin processes started. Incorrect plugin"
599
" directory?\n");
600
process_list = NULL;
926
601
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
602
while(process_list){
930
603
fd_set rfds = rfds_all;
931
604
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
605
if (select_ret == -1){
933
606
perror("select");
934
607
exitstatus = EXIT_FAILURE;
935
goto fallback;
608
goto end;
936
609
}
937
610
/* OK, now either a process completed, or something can be read
938
611
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
612
for(process *proc = process_list; proc ; proc = proc->next){
940
613
/* Is this process completely done? */
941
614
if(proc->eof and proc->completed){
942
615
/* Only accept the plugin output if it exited cleanly */
943
616
if(not WIFEXITED(proc->status)
944
617
or WEXITSTATUS(proc->status) != 0){
945
618
/* Bad exit by plugin */
946
947
619
if(debug){
948
620
if(WIFEXITED(proc->status)){
949
621
fprintf(stderr, "Plugin %u exited with status %d\n",
958
630
(unsigned int) (proc->pid));
959
631
}
960
632
}
961
962
633
/* Remove the plugin */
963
634
FD_CLR(proc->fd, &rfds_all);
964
965
635
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
636
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
637
if(ret < 0){
968
638
perror("sigprocmask");
969
639
exitstatus = EXIT_FAILURE;
970
goto fallback;
971
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
640
goto end;
641
}
642
/* Delete this process entry from the list */
643
if(process_list == proc){
644
/* First one - simple */
645
process_list = proc->next;
646
} else {
647
/* Second one or later */
648
for(process *p = process_list; p != NULL; p = p->next){
649
if(p->next == proc){
650
p->next = proc->next;
651
break;
652
}
653
}
654
}
977
655
/* We are done modifying process list, so unblock signal */
978
656
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
657
NULL);
980
658
if(ret < 0){
981
659
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
continue;
660
}
661
free(proc->buffer);
662
free(proc);
663
/* We deleted this process from the list, so we can't go
664
proc->next. Therefore, start over from the beginning of
665
the process list */
666
break;
991
667
}
992
993
668
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
669
670
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
671
if(not bret){
998
672
perror("print_out_password");
999
673
exitstatus = EXIT_FAILURE;
1000
674
}
1001
goto fallback;
675
goto end;
1002
676
}
1003
1004
677
/* This process has not completed. Does it have any output? */
1005
678
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
679
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
680
continue;
1009
681
}
1010
682
/* Before reading, make the process' data buffer large enough */
1014
686
if (proc->buffer == NULL){
1015
687
perror("malloc");
1016
688
exitstatus = EXIT_FAILURE;
1017
goto fallback;
689
goto end;
1018
690
}
1019
691
proc->buffer_size += BUFFER_SIZE;
1020
692
}
1023
695
BUFFER_SIZE);
1024
696
if(ret < 0){
1025
697
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
698
continue;
1028
699
}
1029
700
if(ret == 0){
1034
705
}
1035
706
}
1036
707
}
1037
1038
1039
fallback:
1040
708
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
709
if(process_list == NULL){
1044
710
bool bret;
1045
711
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
712
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--;
713
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
714
if(not bret){
715
perror("print_out_password");
716
exitstatus = EXIT_FAILURE;
717
goto end;
1052
718
}
1053
bret = print_out_password(passwordbuffer, len);
719
bret = print_out_password("\n", 1);
1054
720
if(not bret){
1055
721
perror("print_out_password");
1056
722
exitstatus = EXIT_FAILURE;
1057
723
}
1058
724
}
725
726
end:
1059
727
1060
728
/* 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);
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
730
731
free(plus_argv);
732
733
/* Free the plugin list */
734
for(plugin *next; plugin_list != NULL; plugin_list = next){
735
next = plugin_list->next;
736
free(plugin_list->argv);
737
free(plugin_list);
1072
738
}
1073
739
1074
740
if(dir != NULL){
1075
741
closedir(dir);
1076
742
}
1077
743
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
}
744
/* Free the process list and kill the processes */
745
for(process *next; process_list != NULL; process_list = next){
746
next = process_list->next;
747
close(process_list->fd);
748
ret = kill(process_list->pid, SIGTERM);
749
if(ret == -1 and errno != ESRCH){
750
/* set-uid proccesses migth not get closed */
751
perror("kill");
1087
752
}
753
free(process_list->buffer);
754
free(process_list);
1088
755
}
1089
756
1090
757
/* Wait for any remaining child processes to terminate */
1095
762
perror("wait");
1096
763
}
1097
764
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
765
return exitstatus;
1104
766
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0