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- Committer: Teddy Hogeborn
- Date: 2008-08-01 07:04:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20080801070432-5t1q0ds0bjxojyoz
* plugins.d/plugbasedclient.c (main): Close the pipe fd after dup2:ing
it onto stdout.
it onto stdout.
- files added:
- ca.pem
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
24
#include <stdio.h> /* popen(), fileno(), fprintf(),
25
stderr, STDOUT_FILENO */
42
26
#include <iso646.h> /* and, or, not */
27
#include <sys/types.h> /* DIR, opendir(), stat(), struct stat,
28
waitpid(), WIFEXITED(),
29
WEXITSTATUS(), wait() */
30
#include <sys/wait.h> /* wait() */
43
31
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
32
readdir(), closedir() */
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
34
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
35
fcntl() */
36
#include <fcntl.h> /* fcntl() */
37
#include <stddef.h> /* NULL */
38
#include <stdlib.h> /* EXIT_FAILURE */
39
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
40
FD_SET(), FD_ISSET() */
41
#include <string.h> /* strlen(), strcpy(), strcat() */
42
#include <stdbool.h> /* true */
43
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
44
WEXITSTATUS() */
55
45
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
48
argp_parse() */
49
50
struct process;
51
52
typedef struct process{
53
pid_t pid;
54
int fd;
55
char *buffer;
56
size_t buffer_size;
57
size_t buffer_length;
58
struct process *next;
59
} process;
76
60
77
61
typedef struct plugin{
78
62
char *name; /* can be NULL or any plugin name */
79
63
char **argv;
80
64
int argc;
81
char **environ;
82
int envc;
83
65
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
94
66
struct plugin *next;
95
67
} plugin;
96
68
97
static plugin *plugin_list = NULL;
98
99
/* Gets a existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
69
plugin *getplugin(char *name, plugin **plugin_list){
70
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
71
if ((p->name == name)
105
72
or (p->name and name and (strcmp(p->name, name) == 0))){
106
73
return p;
109
76
/* Create a new plugin */
110
77
plugin *new_plugin = malloc(sizeof(plugin));
111
78
if (new_plugin == NULL){
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
79
perror("malloc");
80
exit(EXIT_FAILURE);
81
}
82
new_plugin->name = name;
127
83
new_plugin->argv = malloc(sizeof(char *) * 2);
128
84
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
85
perror("malloc");
86
exit(EXIT_FAILURE);
132
87
}
133
new_plugin->argv[0] = copy_name;
88
new_plugin->argv[0] = name;
134
89
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
90
new_plugin->argc = 1;
91
new_plugin->disabled = false;
92
new_plugin->next = *plugin_list;
145
93
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
94
*plugin_list = new_plugin;
147
95
return new_plugin;
148
96
}
149
97
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
98
void addargument(plugin *p, char *arg){
99
p->argv[p->argc] = arg;
100
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
101
if (p->argv == NULL){
102
perror("malloc");
103
exit(EXIT_FAILURE);
104
}
105
p->argc++;
106
p->argv[p->argc] = NULL;
204
107
}
205
108
206
109
/*
208
111
* Descriptor Flags".
209
112
* *Note File Descriptor Flags:(libc)Descriptor Flags.
210
113
*/
211
static int set_cloexec_flag(int fd)
114
int set_cloexec_flag(int fd)
212
115
{
213
116
int ret = fcntl(fd, F_GETFD, 0);
214
117
/* If reading the flags failed, return error indication now. */
220
123
}
221
124
222
125
223
/* Mark processes as completed when they exit, and save their exit
224
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
253
}
254
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
length - written));
264
if(ret < 0){
265
return false;
266
}
267
}
268
return true;
269
}
270
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
305
}
126
#define BUFFER_SIZE 256
127
128
const char *argp_program_version =
129
"plugbasedclient 0.9";
130
const char *argp_program_bug_address =
131
"<mandos@fukt.bsnet.se>";
306
132
307
133
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
134
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
311
135
size_t d_name_len;
312
DIR *dir = NULL;
136
DIR *dir;
313
137
struct dirent *dirst;
314
138
struct stat st;
315
139
fd_set rfds_all;
316
140
int ret, maxfd = 0;
317
uid_t uid = 65534;
318
gid_t gid = 65534;
141
process *process_list = NULL;
319
142
bool debug = false;
320
143
int exitstatus = EXIT_SUCCESS;
321
struct sigaction old_sigchld_action;
322
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
326
327
/* Establish a signal handler */
328
sigemptyset(&sigchld_action.sa_mask);
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
334
}
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
340
}
341
144
342
145
/* The options we understand. */
343
146
struct argp_option options[] = {
344
147
{ .name = "global-options", .key = 'g',
345
148
.arg = "OPTION[,OPTION[,...]]",
346
149
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
350
150
{ .name = "options-for", .key = 'o',
351
151
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
152
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
153
{ .name = "disable", .key = 'd',
357
154
.arg = "PLUGIN",
358
155
.doc = "Disable a specific plugin", .group = 1 },
359
156
{ .name = "plugin-dir", .key = 128,
360
157
.arg = "DIRECTORY",
361
158
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
159
{ .name = "debug", .key = 129,
160
.doc = "Debug mode", .group = 3 },
373
161
{ .name = NULL }
374
162
};
375
163
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
164
error_t parse_opt (int key, char *arg, struct argp_state *state) {
165
/* Get the INPUT argument from `argp_parse', which we
166
know is a pointer to our plugin list pointer. */
167
plugin **plugins = state->input;
378
168
switch (key) {
379
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
390
}
391
}
392
break;
393
case 'e': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0'){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0'){
415
break;
416
}
417
if(opt != NULL){
418
char *p;
419
while((p = strsep(&opt, ",")) != NULL){
420
if(p[0] == '\0'){
421
continue;
422
}
423
if(not add_argument(getplugin(p_name), p)){
424
perror("add_argument");
425
return ARGP_ERR_UNKNOWN;
426
}
427
}
428
}
429
}
430
break;
431
case 'f': /* --env-for */
432
if(arg == NULL){
433
break;
434
}
435
{
436
char *envdef = strchr(arg, ':');
437
if(envdef == NULL){
438
break;
439
}
440
char *p_name = strndup(arg, (size_t) (envdef-arg));
441
if(p_name == NULL){
442
break;
443
}
444
envdef++;
445
if(not add_environment(getplugin(p_name), envdef, true)){
446
perror("add_environment");
447
}
448
}
449
break;
450
case 'd': /* --disable */
451
if (arg != NULL){
452
plugin *p = getplugin(arg);
453
if(p == NULL){
454
return ARGP_ERR_UNKNOWN;
455
}
456
p->disabled = true;
457
}
458
break;
459
case 128: /* --plugin-dir */
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
uid = (uid_t)strtol(arg, NULL, 10);
470
break;
471
case 131: /* --groupid */
472
gid = (gid_t)strtol(arg, NULL, 10);
473
break;
474
case 132: /* --debug */
169
case 'g':
170
if (arg != NULL){
171
char *p = strtok(arg, ",");
172
do{
173
addargument(getplugin(NULL, plugins), p);
174
p = strtok(NULL, ",");
175
} while (p);
176
}
177
break;
178
case 'o':
179
if (arg != NULL){
180
char *name = strtok(arg, ":");
181
char *p = strtok(NULL, ":");
182
if(p){
183
p = strtok(p, ",");
184
do{
185
addargument(getplugin(name, plugins), p);
186
p = strtok(NULL, ",");
187
} while (p);
188
}
189
}
190
break;
191
case 'd':
192
if (arg != NULL){
193
getplugin(arg, plugins)->disabled = true;
194
}
195
break;
196
case 128:
197
plugindir = arg;
198
break;
199
case 129:
475
200
debug = true;
476
201
break;
477
202
case ARGP_KEY_ARG:
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'e': /* --global-env */
496
case 'o': /* --options-for */
497
case 'f': /* --env-for */
498
case 'd': /* --disable */
499
case 128: /* --plugin-dir */
500
break;
501
case 129: /* --config-file */
502
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
505
}
506
break;
507
case 130: /* --userid */
508
case 131: /* --groupid */
509
case 132: /* --debug */
510
case ARGP_KEY_ARG:
511
case ARGP_KEY_END:
512
break;
513
default:
514
return ARGP_ERR_UNKNOWN;
515
}
516
return 0;
517
}
518
519
struct argp argp = { .options = options,
520
.parser = parse_opt_config_file,
203
argp_usage (state);
204
break;
205
case ARGP_KEY_END:
206
break;
207
default:
208
return ARGP_ERR_UNKNOWN;
209
}
210
return 0;
211
}
212
213
plugin *plugin_list = NULL;
214
215
struct argp argp = { .options = options, .parser = parse_opt,
521
216
.args_doc = "",
522
217
.doc = "Mandos plugin runner -- Run plugins" };
523
218
524
/* Parse using the parse_opt_config_file in order to get the custom
525
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
527
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
529
exitstatus = EXIT_FAILURE;
530
goto fallback;
531
}
532
533
/* Reset to the normal argument parser */
534
argp.parser = parse_opt;
535
536
/* Open the configfile if available */
537
if (argfile == NULL){
538
conffp = fopen(AFILE, "r");
539
} else {
540
conffp = fopen(argfile, "r");
541
}
542
if(conffp != NULL){
543
char *org_line = NULL;
544
char *p, *arg, *new_arg, *line;
545
size_t size = 0;
546
ssize_t sret;
547
const char whitespace_delims[] = " \r\t\f\v\n";
548
const char comment_delim[] = "#";
549
550
custom_argc = 1;
551
custom_argv = malloc(sizeof(char*) * 2);
552
if(custom_argv == NULL){
553
perror("malloc");
554
exitstatus = EXIT_FAILURE;
555
goto fallback;
556
}
557
custom_argv[0] = argv[0];
558
custom_argv[1] = NULL;
559
560
/* for each line in the config file, strip whitespace and ignore
561
commented text */
562
while(true){
563
sret = getline(&org_line, &size, conffp);
564
if(sret == -1){
565
break;
566
}
567
568
line = org_line;
569
arg = strsep(&line, comment_delim);
570
while((p = strsep(&arg, whitespace_delims)) != NULL){
571
if(p[0] == '\0'){
572
continue;
573
}
574
new_arg = strdup(p);
575
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
578
free(org_line);
579
goto fallback;
580
}
581
582
custom_argc += 1;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
590
}
591
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
593
}
594
}
595
free(org_line);
596
} else {
597
/* Check for harmful errors and go to fallback. Other errors might
598
not affect opening plugins */
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
}
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
607
if(custom_argv != NULL){
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
613
goto fallback;
614
}
615
}
616
617
/* Parse actual command line arguments, to let them override the
618
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
623
goto fallback;
624
}
219
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
625
220
626
221
if(debug){
627
222
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
225
for(char **a = p->argv; *a != NULL; a++){
631
226
fprintf(stderr, "\tArg: %s\n", *a);
632
227
}
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
634
for(char **a = p->environ; *a != NULL; a++){
635
fprintf(stderr, "\t%s\n", *a);
636
}
637
228
}
638
229
}
639
230
640
/* Strip permissions down to nobody */
641
ret = setuid(uid);
642
if (ret == -1){
643
perror("setuid");
644
}
645
setgid(gid);
646
if (ret == -1){
647
perror("setgid");
648
}
649
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
231
dir = opendir(plugindir);
232
/* Set the FD_CLOEXEC flag on the directory */
233
ret = set_cloexec_flag(dirfd(dir));
234
if(ret < 0){
235
perror("set_cloexec_flag");
236
goto end;
654
237
}
655
238
656
239
if(dir == NULL){
657
perror("Could not open plugin dir");
658
exitstatus = EXIT_FAILURE;
659
goto fallback;
660
}
661
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
663
{
664
int dir_fd = dirfd(dir);
665
if(dir_fd >= 0){
666
ret = set_cloexec_flag(dir_fd);
667
if(ret < 0){
668
perror("set_cloexec_flag");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
671
}
672
}
240
fprintf(stderr, "Can not open directory\n");
241
return EXIT_FAILURE;
673
242
}
674
243
675
244
FD_ZERO(&rfds_all);
676
245
677
/* Read and execute any executable in the plugin directory*/
678
246
while(true){
679
247
dirst = readdir(dir);
680
248
681
/* All directory entries have been processed */
249
// All directory entries have been processed
682
250
if(dirst == NULL){
683
if (errno == EBADF){
684
perror("readdir");
685
exitstatus = EXIT_FAILURE;
686
goto fallback;
687
}
688
251
break;
689
252
}
690
253
691
254
d_name_len = strlen(dirst->d_name);
692
255
693
/* Ignore dotfiles, backup files and other junk */
256
// Ignore dotfiles, backup files and other junk
694
257
{
695
258
bool bad_name = false;
696
259
704
267
if((d_name_len >= pre_len)
705
268
and strncmp((dirst->d_name), *pre, pre_len) == 0){
706
269
if(debug){
707
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
270
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
708
271
" with bad prefix %s\n", dirst->d_name, *pre);
709
272
}
710
273
bad_name = true;
711
274
break;
712
275
}
713
276
}
277
714
278
if(bad_name){
715
279
continue;
716
280
}
281
717
282
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
283
size_t suf_len = strlen(*suf);
719
284
if((d_name_len >= suf_len)
720
285
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
721
286
== 0)){
722
287
if(debug){
723
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
288
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
724
289
" with bad suffix %s\n", dirst->d_name, *suf);
725
290
}
726
291
bad_name = true;
732
297
continue;
733
298
}
734
299
}
735
736
char *filename;
737
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
738
if(ret < 0){
739
perror("asprintf");
740
continue;
741
}
742
300
743
ret = stat(filename, &st);
744
if (ret == -1){
745
perror("stat");
746
free(filename);
747
continue;
301
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
302
if (filename == NULL){
303
perror("malloc");
304
exitstatus =EXIT_FAILURE;
305
goto end;
748
306
}
749
750
/* Ignore non-executable files */
307
strcpy(filename, plugindir);
308
strcat(filename, "/");
309
strcat(filename, dirst->d_name);
310
311
stat(filename, &st);
312
751
313
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
752
314
if(debug){
753
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
315
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
754
316
" with bad type or mode\n", filename);
755
317
}
756
free(filename);
757
continue;
758
}
759
760
plugin *p = getplugin(dirst->d_name);
761
if(p == NULL){
762
perror("getplugin");
763
free(filename);
764
continue;
765
}
766
if(p->disabled){
318
continue;
319
}
320
if(getplugin(dirst->d_name, &plugin_list)->disabled){
767
321
if(debug){
768
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
322
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
769
323
dirst->d_name);
770
324
}
771
free(filename);
772
325
continue;
773
326
}
774
{
775
/* Add global arguments to argument list for this plugin */
776
plugin *g = getplugin(NULL);
777
if(g != NULL){
778
for(char **a = g->argv + 1; *a != NULL; a++){
779
if(not add_argument(p, *a)){
780
perror("add_argument");
781
}
782
}
783
/* Add global environment variables */
784
for(char **e = g->environ; *e != NULL; e++){
785
if(not add_environment(p, *e, false)){
786
perror("add_environment");
787
}
788
}
789
}
790
}
791
/* If this plugin has any environment variables, we will call
792
using execve and need to duplicate the environment from this
793
process, too. */
794
if(p->environ[0] != NULL){
795
for(char **e = environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
797
perror("add_environment");
798
}
799
}
800
}
801
802
int pipefd[2];
327
// Starting a new process to be watched
328
int pipefd[2];
803
329
ret = pipe(pipefd);
804
330
if (ret == -1){
805
331
perror("pipe");
806
exitstatus = EXIT_FAILURE;
807
goto fallback;
808
}
809
/* Ask OS to automatic close the pipe on exec */
810
ret = set_cloexec_flag(pipefd[0]);
811
if(ret < 0){
812
perror("set_cloexec_flag");
813
exitstatus = EXIT_FAILURE;
814
goto fallback;
815
}
816
ret = set_cloexec_flag(pipefd[1]);
817
if(ret < 0){
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
822
/* Block SIGCHLD until process is safely in process list */
823
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
824
if(ret < 0){
825
perror("sigprocmask");
826
exitstatus = EXIT_FAILURE;
827
goto fallback;
828
}
829
/* Starting a new process to be watched */
332
goto end;
333
}
334
plugin *p = getplugin(dirst->d_name, &plugin_list);
335
{
336
/* Add global arguments to argument list for this plugin */
337
plugin *g = getplugin(NULL, &plugin_list);
338
for(char **a = g->argv + 1; *a != NULL; a++){
339
addargument(p, *a);
340
}
341
}
830
342
pid_t pid = fork();
831
if(pid == -1){
832
perror("fork");
833
exitstatus = EXIT_FAILURE;
834
goto fallback;
835
}
836
343
if(pid == 0){
837
344
/* this is the child process */
838
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
839
if(ret < 0){
840
perror("sigaction");
841
_exit(EXIT_FAILURE);
842
}
843
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
844
if(ret < 0){
845
perror("sigprocmask");
846
_exit(EXIT_FAILURE);
847
}
848
849
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
850
if(ret == -1){
851
perror("dup2");
852
_exit(EXIT_FAILURE);
345
closedir(dir);
346
close(pipefd[0]); /* close unused read end of pipe */
347
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
348
if(pipefd[1] > 2){
349
close(pipefd[1]);
853
350
}
854
351
855
if(dirfd(dir) < 0){
856
/* If dir has no file descriptor, we could not set FD_CLOEXEC
857
above and must now close it manually here. */
858
closedir(dir);
859
}
860
if(p->environ[0] == NULL){
861
if(execv(filename, p->argv) < 0){
862
perror("execv");
863
_exit(EXIT_FAILURE);
864
}
865
} else {
866
if(execve(filename, p->argv, p->environ) < 0){
867
perror("execve");
868
_exit(EXIT_FAILURE);
869
}
352
if(execv(filename, p->argv) < 0){
353
perror(argv[0]);
354
close(pipefd[1]);
355
_exit(EXIT_FAILURE);
870
356
}
871
357
/* no return */
872
358
}
873
/* Parent process */
874
close(pipefd[1]); /* Close unused write end of pipe */
875
free(filename);
876
plugin *new_plugin = getplugin(dirst->d_name);
877
if (new_plugin == NULL){
878
perror("getplugin");
879
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
880
if(ret < 0){
881
perror("sigprocmask");
882
}
883
exitstatus = EXIT_FAILURE;
884
goto fallback;
885
}
886
887
new_plugin->pid = pid;
888
new_plugin->fd = pipefd[0];
889
890
/* Unblock SIGCHLD so signal handler can be run if this process
891
has already completed */
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
893
if(ret < 0){
894
perror("sigprocmask");
895
exitstatus = EXIT_FAILURE;
896
goto fallback;
897
}
898
899
FD_SET(new_plugin->fd, &rfds_all);
900
901
if (maxfd < new_plugin->fd){
902
maxfd = new_plugin->fd;
903
}
904
359
close(pipefd[1]); /* close unused write end of pipe */
360
process *new_process = malloc(sizeof(process));
361
if (new_process == NULL){
362
perror("malloc");
363
exitstatus = EXIT_FAILURE;
364
goto end;
365
}
366
367
new_process->fd = pipefd[0];
368
new_process->buffer = malloc(BUFFER_SIZE);
369
if (new_process->buffer == NULL){
370
perror("malloc");
371
exitstatus = EXIT_FAILURE;
372
goto end;
373
}
374
new_process->buffer_size = BUFFER_SIZE;
375
new_process->buffer_length = 0;
376
FD_SET(new_process->fd, &rfds_all);
377
378
if (maxfd < new_process->fd){
379
maxfd = new_process->fd;
380
}
381
382
//List handling
383
new_process->next = process_list;
384
process_list = new_process;
905
385
}
906
386
907
387
closedir(dir);
908
dir = NULL;
909
910
for(plugin *p = plugin_list; p != NULL; p = p->next){
911
if(p->pid != 0){
388
389
if (process_list != NULL){
390
while(true){
391
fd_set rfds = rfds_all;
392
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
393
if (select_ret == -1){
394
perror(argv[0]);
395
goto end;
396
}else{
397
for(process *process_itr = process_list; process_itr != NULL;
398
process_itr = process_itr->next){
399
if(FD_ISSET(process_itr->fd, &rfds)){
400
if(process_itr->buffer_length + BUFFER_SIZE
401
> process_itr->buffer_size){
402
process_itr->buffer = realloc(process_itr->buffer,
403
process_itr->buffer_size
404
+ (size_t) BUFFER_SIZE);
405
if (process_itr->buffer == NULL){
406
perror(argv[0]);
407
goto end;
408
}
409
process_itr->buffer_size += BUFFER_SIZE;
410
}
411
ret = read(process_itr->fd, process_itr->buffer
412
+ process_itr->buffer_length, BUFFER_SIZE);
413
if(ret < 0){
414
/* Read error from this process; ignore it */
415
continue;
416
}
417
process_itr->buffer_length += (size_t) ret;
418
if(ret == 0){
419
/* got EOF */
420
/* wait for process exit */
421
int status;
422
waitpid(process_itr->pid, &status, 0);
423
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
424
for(size_t written = 0;
425
written < process_itr->buffer_length;){
426
ret = write(STDOUT_FILENO,
427
process_itr->buffer + written,
428
process_itr->buffer_length - written);
429
if(ret < 0){
430
perror(argv[0]);
431
goto end;
432
}
433
written += (size_t)ret;
434
}
435
goto end;
436
} else {
437
FD_CLR(process_itr->fd, &rfds_all);
438
}
439
}
440
}
441
}
442
}
443
}
444
}
445
446
end:
447
for(process *process_itr = process_list; process_itr != NULL;
448
process_itr = process_itr->next){
449
close(process_itr->fd);
450
kill(process_itr->pid, SIGTERM);
451
free(process_itr->buffer);
452
}
453
454
while(true){
455
int status;
456
ret = wait(&status);
457
if (ret == -1){
458
if(errno != ECHILD){
459
perror("wait");
460
}
912
461
break;
913
462
}
914
if(p->next == NULL){
915
fprintf(stderr, "No plugin processes started. Incorrect plugin"
916
" directory?\n");
917
free_plugin_list();
918
}
919
}
920
921
/* Main loop while running plugins exist */
922
while(plugin_list){
923
fd_set rfds = rfds_all;
924
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
925
if (select_ret == -1){
926
perror("select");
927
exitstatus = EXIT_FAILURE;
928
goto fallback;
929
}
930
/* OK, now either a process completed, or something can be read
931
from one of them */
932
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
933
/* Is this process completely done? */
934
if(proc->eof and proc->completed){
935
/* Only accept the plugin output if it exited cleanly */
936
if(not WIFEXITED(proc->status)
937
or WEXITSTATUS(proc->status) != 0){
938
/* Bad exit by plugin */
939
940
if(debug){
941
if(WIFEXITED(proc->status)){
942
fprintf(stderr, "Plugin %u exited with status %d\n",
943
(unsigned int) (proc->pid),
944
WEXITSTATUS(proc->status));
945
} else if(WIFSIGNALED(proc->status)) {
946
fprintf(stderr, "Plugin %u killed by signal %d\n",
947
(unsigned int) (proc->pid),
948
WTERMSIG(proc->status));
949
} else if(WCOREDUMP(proc->status)){
950
fprintf(stderr, "Plugin %d dumped core\n",
951
(unsigned int) (proc->pid));
952
}
953
}
954
955
/* Remove the plugin */
956
FD_CLR(proc->fd, &rfds_all);
957
958
/* Block signal while modifying process_list */
959
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
963
goto fallback;
964
}
965
free_plugin(proc);
966
/* We are done modifying process list, so unblock signal */
967
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
968
NULL);
969
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
if(plugin_list == NULL){
976
break;
977
}
978
continue;
979
}
980
981
/* This process exited nicely, so print its buffer */
982
983
bool bret = print_out_password(proc->buffer,
984
proc->buffer_length);
985
if(not bret){
986
perror("print_out_password");
987
exitstatus = EXIT_FAILURE;
988
}
989
goto fallback;
990
}
991
992
/* This process has not completed. Does it have any output? */
993
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
994
/* This process had nothing to say at this time */
995
continue;
996
}
997
/* Before reading, make the process' data buffer large enough */
998
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
999
proc->buffer = realloc(proc->buffer, proc->buffer_size
1000
+ (size_t) BUFFER_SIZE);
1001
if (proc->buffer == NULL){
1002
perror("malloc");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
proc->buffer_size += BUFFER_SIZE;
1007
}
1008
/* Read from the process */
1009
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1010
BUFFER_SIZE);
1011
if(ret < 0){
1012
/* Read error from this process; ignore the error */
1013
continue;
1014
}
1015
if(ret == 0){
1016
/* got EOF */
1017
proc->eof = true;
1018
} else {
1019
proc->buffer_length += (size_t) ret;
1020
}
1021
}
1022
}
1023
1024
1025
fallback:
1026
1027
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1028
/* Fallback if all plugins failed, none are found or an error
1029
occured */
1030
bool bret;
1031
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1032
char *passwordbuffer = getpass("Password: ");
1033
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1034
if(not bret){
1035
perror("print_out_password");
1036
exitstatus = EXIT_FAILURE;
1037
}
1038
}
1039
1040
/* Restore old signal handler */
1041
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1042
if(ret == -1){
1043
perror("sigaction");
1044
exitstatus = EXIT_FAILURE;
1045
}
1046
1047
if(custom_argv != NULL){
1048
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1049
free(*arg);
1050
}
1051
free(custom_argv);
1052
}
1053
1054
if(dir != NULL){
1055
closedir(dir);
1056
}
1057
1058
/* Free the process list and kill the processes */
1059
for(plugin *p = plugin_list; p != NULL; p = p->next){
1060
if(p->pid != 0){
1061
close(p->fd);
1062
ret = kill(p->pid, SIGTERM);
1063
if(ret == -1 and errno != ESRCH){
1064
/* Set-uid proccesses might not get closed */
1065
perror("kill");
1066
}
1067
}
1068
}
1069
1070
/* Wait for any remaining child processes to terminate */
1071
do{
1072
ret = wait(NULL);
1073
} while(ret >= 0);
1074
if(errno != ECHILD){
1075
perror("wait");
1076
}
1077
1078
free_plugin_list();
1079
1080
free(plugindir);
1081
free(argfile);
1082
463
}
1083
464
return exitstatus;
1084
465
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0