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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 © 2008,2009 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> /* 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,
66
65
#include <errno.h> /* errno, EBADF */
67
66
68
67
#define BUFFER_SIZE 256
69
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;
68
#define ARGFILE "/conf/conf.d/mandos/plugins.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
74
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
72
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;
73
struct process;
83
74
84
/* Variables used for running processes*/
75
typedef struct process{
85
76
pid_t pid;
86
77
int fd;
87
78
char *buffer;
88
79
size_t buffer_size;
89
80
size_t buffer_length;
90
81
bool eof;
91
volatile bool completed;
92
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;
93
92
struct plugin *next;
94
93
} plugin;
95
94
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){
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
103
97
if ((p->name == name)
104
98
or (p->name and name and (strcmp(p->name, name) == 0))){
105
99
return p;
108
102
/* Create a new plugin */
109
103
plugin *new_plugin = malloc(sizeof(plugin));
110
104
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
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
126
109
new_plugin->argv = malloc(sizeof(char *) * 2);
127
110
if (new_plugin->argv == NULL){
128
free(copy_name);
129
free(new_plugin);
130
return NULL;
111
perror("malloc");
112
exit(EXIT_FAILURE);
131
113
}
132
new_plugin->argv[0] = copy_name;
114
new_plugin->argv[0] = name;
133
115
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
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
144
119
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
120
*plugin_list = new_plugin;
146
121
return new_plugin;
147
122
}
148
123
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));
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;
203
133
}
204
134
205
135
/*
207
137
* Descriptor Flags".
208
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
139
*/
210
static int set_cloexec_flag(int fd){
140
static int set_cloexec_flag(int fd)
141
{
211
142
int ret = fcntl(fd, F_GETFD, 0);
212
143
/* If reading the flags failed, return error indication now. */
213
144
if(ret < 0){
217
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
218
149
}
219
150
151
process *process_list = NULL;
220
152
221
/* Mark processes as completed when they exit, and save their exit
153
/* Mark a process as completed when it exits, and save its exit
222
154
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
}
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;
251
172
}
252
173
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
174
bool print_out_password(const char *buffer, size_t length){
255
175
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
256
179
for(size_t written = 0; written < length; written += (size_t)ret){
257
180
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
258
181
length - written));
263
186
return true;
264
187
}
265
188
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);
189
char ** addcustomargument(char **argv, int *argc, char *arg){
278
190
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
}
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
290
196
}
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
}
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;
300
209
}
301
210
302
211
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
212
const char *plugindir = "/lib/mandos/plugins.d";
213
const char *argfile = ARGFILE;
305
214
FILE *conffp;
306
215
size_t d_name_len;
307
216
DIR *dir = NULL;
309
218
struct stat st;
310
219
fd_set rfds_all;
311
220
int ret, maxfd = 0;
312
ssize_t sret;
313
221
uid_t uid = 65534;
314
222
gid_t gid = 65534;
315
223
bool debug = false;
323
231
/* Establish a signal handler */
324
232
sigemptyset(&sigchld_action.sa_mask);
325
233
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
if(ret == -1){
234
if(ret < 0){
327
235
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
329
goto fallback;
236
exit(EXIT_FAILURE);
330
237
}
331
238
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
if(ret == -1){
239
if(ret < 0){
333
240
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
241
exit(EXIT_FAILURE);
336
242
}
337
243
338
244
/* The options we understand. */
340
246
{ .name = "global-options", .key = 'g',
341
247
.arg = "OPTION[,OPTION[,...]]",
342
248
.doc = "Options passed to all plugins" },
343
{ .name = "global-env", .key = 'G',
344
.arg = "VAR=value",
345
.doc = "Environment variable passed to all plugins" },
346
249
{ .name = "options-for", .key = 'o',
347
250
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
348
251
.doc = "Options passed only to specified plugin" },
349
{ .name = "env-for", .key = 'E',
350
.arg = "PLUGIN:ENV=value",
351
.doc = "Environment variable passed to specified plugin" },
352
252
{ .name = "disable", .key = 'd',
353
253
.arg = "PLUGIN",
354
254
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
356
.arg = "PLUGIN",
357
.doc = "Enable a specific plugin", .group = 1 },
358
255
{ .name = "plugin-dir", .key = 128,
359
256
.arg = "DIRECTORY",
360
257
.doc = "Specify a different plugin directory", .group = 2 },
361
{ .name = "config-file", .key = 129,
362
.arg = "FILE",
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.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 },
372
266
{ .name = NULL }
373
267
};
374
268
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
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;
377
273
switch (key) {
378
case 'g': /* --global-options */
274
case 'g':
379
275
if (arg != NULL){
380
276
char *p;
381
277
while((p = strsep(&arg, ",")) != NULL){
382
278
if(p[0] == '\0'){
383
279
continue;
384
280
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
281
addargument(getplugin(NULL, plugins), p);
389
282
}
390
283
}
391
284
break;
392
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
399
break;
400
case 'o': /* --options-for */
285
case 'o':
401
286
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
404
289
break;
405
290
}
406
291
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
418
}
419
}
420
}
421
break;
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
{
427
char *envdef = strchr(arg, ':');
428
if(envdef == NULL){
429
break;
430
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
434
}
435
}
436
break;
437
case 'd': /* --disable */
438
if (arg != NULL){
439
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
442
}
443
p->disabled = true;
444
}
445
break;
446
case 'e': /* --enable */
447
if (arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
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:
466
315
uid = (uid_t)strtol(arg, NULL, 10);
467
316
break;
468
case 131: /* --groupid */
317
case 130:
469
318
gid = (gid_t)strtol(arg, NULL, 10);
470
319
break;
471
case 132: /* --debug */
320
case 131:
472
321
debug = true;
473
322
break;
474
323
case ARGP_KEY_ARG:
475
/* Cryptsetup always passes an argument, which is an empty
476
string if "none" was specified in /etc/crypttab. So if
477
argument was empty, we ignore it silently. */
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
484
default:
485
return ARGP_ERR_UNKNOWN;
486
}
487
return 0;
488
}
489
490
/* This option parser is the same as parse_opt() above, except it
491
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
496
case 'g': /* --global-options */
497
case 'G': /* --global-env */
498
case 'o': /* --options-for */
499
case 'E': /* --env-for */
500
case 'd': /* --disable */
501
case 'e': /* --enable */
502
case 128: /* --plugin-dir */
503
break;
504
case 129: /* --config-file */
505
free(argfile);
506
argfile = strdup(arg);
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
511
case 130: /* --userid */
512
case 131: /* --groupid */
513
case 132: /* --debug */
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
516
break;
517
default:
518
return ARGP_ERR_UNKNOWN;
519
}
520
return 0;
521
}
522
523
struct argp argp = { .options = options,
524
.parser = parse_opt_config_file,
525
.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]",
526
338
.doc = "Mandos plugin runner -- Run plugins" };
527
339
528
/* Parse using the parse_opt_config_file in order to get the custom
529
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
531
341
if (ret == ARGP_ERR_UNKNOWN){
532
342
fprintf(stderr, "Unknown error while parsing arguments\n");
533
343
exitstatus = EXIT_FAILURE;
534
goto fallback;
344
goto end;
535
345
}
536
537
/* Reset to the normal argument parser */
538
argp.parser = parse_opt;
539
540
/* Open the configfile if available */
541
if (argfile == NULL){
542
conffp = fopen(AFILE, "r");
543
} else {
544
conffp = fopen(argfile, "r");
545
}
346
347
conffp = fopen(argfile, "r");
546
348
if(conffp != NULL){
547
349
char *org_line = NULL;
350
size_t size = 0;
351
ssize_t sret;
548
352
char *p, *arg, *new_arg, *line;
549
size_t size = 0;
550
353
const char whitespace_delims[] = " \r\t\f\v\n";
551
354
const char comment_delim[] = "#";
552
355
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
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
356
while(true){
566
357
sret = getline(&org_line, &size, conffp);
567
358
if(sret == -1){
575
366
continue;
576
367
}
577
368
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;
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
}
596
375
}
597
376
}
598
377
free(org_line);
599
} else {
378
} else{
600
379
/* Check for harmful errors and go to fallback. Other errors might
601
380
not affect opening plugins */
602
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
382
perror("fopen");
604
383
exitstatus = EXIT_FAILURE;
605
goto fallback;
384
goto end;
606
385
}
607
386
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
387
610
388
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
391
if (ret == ARGP_ERR_UNKNOWN){
614
392
fprintf(stderr, "Unknown error while parsing arguments\n");
615
393
exitstatus = EXIT_FAILURE;
616
goto fallback;
394
goto end;
617
395
}
618
396
}
619
397
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
398
if(debug){
630
399
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
400
fprintf(stderr, "Plugin: %s has %d arguments\n",
633
402
for(char **a = p->argv; *a != NULL; a++){
634
403
fprintf(stderr, "\tArg: %s\n", *a);
635
404
}
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
405
}
641
406
}
642
407
643
/* Strip permissions down to nobody */
644
408
ret = setuid(uid);
645
409
if (ret == -1){
646
410
perror("setuid");
647
}
411
}
412
648
413
setgid(gid);
649
414
if (ret == -1){
650
415
perror("setgid");
651
416
}
652
417
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
418
dir = opendir(plugindir);
659
419
if(dir == NULL){
660
420
perror("Could not open plugin dir");
661
421
exitstatus = EXIT_FAILURE;
662
goto fallback;
422
goto end;
663
423
}
664
424
665
425
/* Set the FD_CLOEXEC flag on the directory, if possible */
670
430
if(ret < 0){
671
431
perror("set_cloexec_flag");
672
432
exitstatus = EXIT_FAILURE;
673
goto fallback;
433
goto end;
674
434
}
675
435
}
676
436
}
677
437
678
438
FD_ZERO(&rfds_all);
679
439
680
/* Read and execute any executable in the plugin directory*/
681
440
while(true){
682
441
dirst = readdir(dir);
683
442
684
/* All directory entries have been processed */
443
// All directory entries have been processed
685
444
if(dirst == NULL){
686
445
if (errno == EBADF){
687
446
perror("readdir");
688
447
exitstatus = EXIT_FAILURE;
689
goto fallback;
448
goto end;
690
449
}
691
450
break;
692
451
}
693
452
694
453
d_name_len = strlen(dirst->d_name);
695
454
696
/* Ignore dotfiles, backup files and other junk */
455
// Ignore dotfiles, backup files and other junk
697
456
{
698
457
bool bad_name = false;
699
458
701
460
702
461
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
462
".dpkg-old",
704
".dpkg-bak",
705
463
".dpkg-divert", NULL };
706
464
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
465
size_t pre_len = strlen(*pre);
715
473
break;
716
474
}
717
475
}
476
718
477
if(bad_name){
719
478
continue;
720
479
}
480
721
481
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
482
size_t suf_len = strlen(*suf);
723
483
if((d_name_len >= suf_len)
736
496
continue;
737
497
}
738
498
}
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");
499
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
502
perror("malloc");
748
503
continue;
749
504
}
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
750
508
751
509
ret = stat(filename, &st);
752
510
if (ret == -1){
754
512
free(filename);
755
513
continue;
756
514
}
757
758
/* Ignore non-executable files */
515
759
516
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
760
517
if(debug){
761
518
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
764
521
free(filename);
765
522
continue;
766
523
}
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){
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
775
525
if(debug){
776
526
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
527
dirst->d_name);
779
529
free(filename);
780
530
continue;
781
531
}
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
782
533
{
783
534
/* 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];
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];
811
541
ret = pipe(pipefd);
812
542
if (ret == -1){
813
543
perror("pipe");
814
544
exitstatus = EXIT_FAILURE;
815
goto fallback;
545
goto end;
816
546
}
817
/* Ask OS to automatic close the pipe on exec */
818
547
ret = set_cloexec_flag(pipefd[0]);
819
548
if(ret < 0){
820
549
perror("set_cloexec_flag");
821
550
exitstatus = EXIT_FAILURE;
822
goto fallback;
551
goto end;
823
552
}
824
553
ret = set_cloexec_flag(pipefd[1]);
825
554
if(ret < 0){
826
555
perror("set_cloexec_flag");
827
556
exitstatus = EXIT_FAILURE;
828
goto fallback;
557
goto end;
829
558
}
830
559
/* Block SIGCHLD until process is safely in process list */
831
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
832
561
if(ret < 0){
833
562
perror("sigprocmask");
834
563
exitstatus = EXIT_FAILURE;
835
goto fallback;
564
goto end;
836
565
}
837
/* Starting a new process to be watched */
566
// Starting a new process to be watched
838
567
pid_t pid = fork();
839
568
if(pid == -1){
840
569
perror("fork");
841
570
exitstatus = EXIT_FAILURE;
842
goto fallback;
571
goto end;
843
572
}
844
573
if(pid == 0){
845
574
/* this is the child process */
848
577
perror("sigaction");
849
578
_exit(EXIT_FAILURE);
850
579
}
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
581
if(ret < 0){
853
582
perror("sigprocmask");
854
583
_exit(EXIT_FAILURE);
855
584
}
856
585
857
586
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
587
if(ret == -1){
859
588
perror("dup2");
865
594
above and must now close it manually here. */
866
595
closedir(dir);
867
596
}
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
}
597
if(execv(filename, p->argv) < 0){
598
perror("execv");
599
_exit(EXIT_FAILURE);
878
600
}
879
601
/* no return */
880
602
}
881
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
603
/* parent process */
883
604
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
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");
887
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
888
610
if(ret < 0){
889
perror("sigprocmask");
611
perror("sigprocmask");
890
612
}
891
613
exitstatus = EXIT_FAILURE;
892
goto fallback;
614
goto end;
893
615
}
894
616
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
897
617
*new_process = (struct process){ .pid = pid,
618
.fd = pipefd[0],
619
.next = process_list };
620
// List handling
621
process_list = new_process;
898
622
/* Unblock SIGCHLD so signal handler can be run if this process
899
623
has already completed */
900
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
901
625
if(ret < 0){
902
626
perror("sigprocmask");
903
627
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
}
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);
912
644
}
913
645
914
646
closedir(dir);
915
647
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
}
648
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
651
" directory?\n");
652
process_list = NULL;
926
653
}
927
928
/* Main loop while running plugins exist */
929
while(plugin_list){
654
while(process_list){
930
655
fd_set rfds = rfds_all;
931
656
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
657
if (select_ret == -1){
933
658
perror("select");
934
659
exitstatus = EXIT_FAILURE;
935
goto fallback;
660
goto end;
936
661
}
937
662
/* OK, now either a process completed, or something can be read
938
663
from one of them */
939
for(plugin *proc = plugin_list; proc != NULL;){
664
for(process *proc = process_list; proc ; proc = proc->next){
940
665
/* Is this process completely done? */
941
666
if(proc->eof and proc->completed){
942
667
/* Only accept the plugin output if it exited cleanly */
943
668
if(not WIFEXITED(proc->status)
944
669
or WEXITSTATUS(proc->status) != 0){
945
670
/* Bad exit by plugin */
946
947
671
if(debug){
948
672
if(WIFEXITED(proc->status)){
949
673
fprintf(stderr, "Plugin %u exited with status %d\n",
958
682
(unsigned int) (proc->pid));
959
683
}
960
684
}
961
962
685
/* Remove the plugin */
963
686
FD_CLR(proc->fd, &rfds_all);
964
965
687
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
689
if(ret < 0){
968
690
perror("sigprocmask");
969
691
exitstatus = EXIT_FAILURE;
970
goto fallback;
971
}
972
973
plugin *next_plugin = proc->next;
974
free_plugin(proc);
975
proc = next_plugin;
976
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
}
977
707
/* We are done modifying process list, so unblock signal */
978
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
709
NULL);
980
710
if(ret < 0){
981
711
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
990
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;
991
719
}
992
993
720
/* This process exited nicely, so print its buffer */
994
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
721
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
723
if(not bret){
998
724
perror("print_out_password");
999
725
exitstatus = EXIT_FAILURE;
1000
726
}
1001
goto fallback;
727
goto end;
1002
728
}
1003
1004
729
/* This process has not completed. Does it have any output? */
1005
730
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
731
/* This process had nothing to say at this time */
1007
proc = proc->next;
1008
732
continue;
1009
733
}
1010
734
/* Before reading, make the process' data buffer large enough */
1014
738
if (proc->buffer == NULL){
1015
739
perror("malloc");
1016
740
exitstatus = EXIT_FAILURE;
1017
goto fallback;
741
goto end;
1018
742
}
1019
743
proc->buffer_size += BUFFER_SIZE;
1020
744
}
1021
745
/* Read from the process */
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(sret < 0){
746
ret = read(proc->fd, proc->buffer + proc->buffer_length,
747
BUFFER_SIZE);
748
if(ret < 0){
1025
749
/* Read error from this process; ignore the error */
1026
proc = proc->next;
1027
750
continue;
1028
751
}
1029
if(sret == 0){
752
if(ret == 0){
1030
753
/* got EOF */
1031
754
proc->eof = true;
1032
755
} else {
1033
proc->buffer_length += (size_t) sret;
756
proc->buffer_length += (size_t) ret;
1034
757
}
1035
758
}
1036
759
}
1037
760
1038
761
1039
fallback:
762
end:
1040
763
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1043
occured */
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1044
766
bool bret;
1045
767
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
768
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);
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1054
770
if(not bret){
1055
771
perror("print_out_password");
1056
772
exitstatus = EXIT_FAILURE;
773
goto end;
1057
774
}
1058
775
}
1059
776
1060
777
/* 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);
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);
1072
787
}
1073
788
1074
789
if(dir != NULL){
1075
790
closedir(dir);
1076
791
}
1077
792
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
}
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");
1087
801
}
802
free(process_list->buffer);
803
free(process_list);
1088
804
}
1089
805
1090
806
/* Wait for any remaining child processes to terminate */
1095
811
perror("wait");
1096
812
}
1097
813
1098
free_plugin_list();
1099
1100
free(plugindir);
1101
free(argfile);
1102
1103
814
return exitstatus;
1104
815
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0