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- Committer: Teddy Hogeborn
- Date: 2008-09-01 08:29:23 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901082923-i2liq6t7warmu9xe
* mandos.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
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() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
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() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
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 */
52
66
53
67
#define BUFFER_SIZE 256
54
68
55
struct process;
56
57
typedef struct process{
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;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
58
86
pid_t pid;
59
87
int fd;
60
88
char *buffer;
61
89
size_t buffer_size;
62
90
size_t buffer_length;
63
91
bool eof;
64
bool completed;
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
92
volatile bool completed;
93
volatile int status;
74
94
struct plugin *next;
75
95
} plugin;
76
96
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
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){
79
104
if ((p->name == name)
80
105
or (p->name and name and (strcmp(p->name, name) == 0))){
81
106
return p;
84
109
/* Create a new plugin */
85
110
plugin *new_plugin = malloc(sizeof(plugin));
86
111
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
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
91
127
new_plugin->argv = malloc(sizeof(char *) * 2);
92
128
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
95
132
}
96
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
97
134
new_plugin->argv[1] = NULL;
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
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
101
145
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
103
147
return new_plugin;
104
148
}
105
149
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
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){
183
if(p == NULL){
184
return false;
185
}
186
return add_to_char_array(def, &(p->environ), &(p->envc));
115
187
}
116
188
117
189
/*
130
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
131
203
}
132
204
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
205
206
/* Mark processes as completed when they exit, and save their exit
139
207
status. */
140
208
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
209
while(true){
210
plugin *proc = plugin_list;
211
int status;
212
pid_t pid = waitpid(-1, &status, WNOHANG);
213
if(pid == 0){
214
/* Only still running child processes */
215
break;
216
}
217
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
220
}
221
/* No child processes */
222
break;
223
}
224
225
/* A child exited, find it in process_list */
226
while(proc != NULL and proc->pid != pid){
227
proc = proc->next;
228
}
229
if(proc == NULL){
230
/* Process not found in process list */
231
continue;
232
}
233
proc->status = status;
234
proc->completed = true;
235
}
236
}
237
238
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
for(size_t written = 0; written < length; written += (size_t)ret){
245
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
length - written));
247
if(ret < 0){
248
return false;
249
}
250
}
251
return true;
252
}
253
254
/* Removes and free a plugin from the plugin list */
255
static void free_plugin(plugin *plugin_node){
256
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
258
free(*arg);
259
}
260
free(plugin_node->argv);
261
for(char **env = plugin_node->environ; *env != NULL; env++){
262
free(*env);
263
}
264
free(plugin_node->environ);
265
free(plugin_node->buffer);
266
267
/* Removes the plugin from the singly-linked list */
268
if(plugin_node == plugin_list){
269
/* First one - simple */
270
plugin_list = plugin_list->next;
271
} else {
272
/* Second one or later */
273
for(plugin *p = plugin_list; p != NULL; p = p->next){
274
if(p->next == plugin_node){
275
p->next = plugin_node->next;
276
break;
277
}
278
}
279
}
280
281
free(plugin_node);
282
}
283
284
static void free_plugin_list(void){
285
while(plugin_list != NULL){
286
free_plugin(plugin_list);
287
}
153
288
}
154
289
155
290
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
291
char *plugindir = NULL;
292
char *argfile = NULL;
293
FILE *conffp;
157
294
size_t d_name_len;
158
295
DIR *dir = NULL;
159
296
struct dirent *dirst;
167
304
struct sigaction old_sigchld_action;
168
305
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
306
.sa_flags = SA_NOCLDSTOP };
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
307
char **custom_argv = NULL;
308
int custom_argc = 0;
172
309
173
310
/* Establish a signal handler */
174
311
sigemptyset(&sigchld_action.sa_mask);
175
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
176
if(ret < 0){
313
if(ret == -1){
177
314
perror("sigaddset");
178
exit(EXIT_FAILURE);
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
179
317
}
180
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
181
if(ret < 0){
319
if(ret == -1){
182
320
perror("sigaction");
183
exit(EXIT_FAILURE);
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
184
323
}
185
324
186
325
/* The options we understand. */
188
327
{ .name = "global-options", .key = 'g',
189
328
.arg = "OPTION[,OPTION[,...]]",
190
329
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
331
.arg = "VAR=value",
332
.doc = "Environment variable passed to all plugins" },
191
333
{ .name = "options-for", .key = 'o',
192
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
335
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
337
.arg = "PLUGIN:ENV=value",
338
.doc = "Environment variable passed to specified plugin" },
194
339
{ .name = "disable", .key = 'd',
195
340
.arg = "PLUGIN",
196
341
.doc = "Disable a specific plugin", .group = 1 },
197
342
{ .name = "plugin-dir", .key = 128,
198
343
.arg = "DIRECTORY",
199
344
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
345
{ .name = "config-file", .key = 129,
346
.arg = "FILE",
347
.doc = "Specify a different configuration file", .group = 2 },
348
{ .name = "userid", .key = 130,
349
.arg = "ID", .flags = 0,
350
.doc = "User ID the plugins will run as", .group = 3 },
351
{ .name = "groupid", .key = 131,
352
.arg = "ID", .flags = 0,
353
.doc = "Group ID the plugins will run as", .group = 3 },
354
{ .name = "debug", .key = 132,
355
.doc = "Debug mode", .group = 4 },
208
356
{ .name = NULL }
209
357
};
210
358
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
212
361
/* Get the INPUT argument from `argp_parse', which we know is a
213
362
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
363
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
364
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
382
{
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
389
}
390
}
391
break;
392
case 'o': /* --options-for */
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
412
}
413
}
414
}
415
break;
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
420
{
421
char *envdef = strchr(arg, ':');
422
if(envdef == NULL){
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
429
envdef++;
430
if(not add_environment(getplugin(p_name), envdef)){
431
perror("add_environment");
432
}
433
}
434
break;
435
case 'd': /* --disable */
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
442
}
443
break;
444
case 128: /* --plugin-dir */
445
plugindir = strdup(arg);
446
if(plugindir == NULL){
447
perror("strdup");
448
}
449
break;
450
case 129: /* --config-file */
451
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
454
}
455
break;
456
case 130: /* --userid */
247
457
uid = (uid_t)strtol(arg, NULL, 10);
248
458
break;
249
case 130:
459
case 131: /* --groupid */
250
460
gid = (gid_t)strtol(arg, NULL, 10);
251
461
break;
252
case 131:
462
case 132: /* --debug */
253
463
debug = true;
254
464
break;
255
465
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
258
}
259
plus_options = arg;
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
260
467
break;
261
468
case ARGP_KEY_END:
262
469
break;
266
473
return 0;
267
474
}
268
475
269
plugin *plugin_list = NULL;
270
271
476
struct argp argp = { .options = options, .parser = parse_opt,
272
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
273
478
.doc = "Mandos plugin runner -- Run plugins" };
274
479
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
481
if (ret == ARGP_ERR_UNKNOWN){
482
fprintf(stderr, "Unknown error while parsing arguments\n");
483
exitstatus = EXIT_FAILURE;
484
goto fallback;
485
}
486
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
489
conffp = fopen(AFILE, "r");
490
} else {
491
conffp = fopen(argfile, "r");
492
}
493
if(conffp != NULL){
494
char *org_line = NULL;
495
char *p, *arg, *new_arg, *line;
496
size_t size = 0;
497
ssize_t sret;
498
const char whitespace_delims[] = " \r\t\f\v\n";
499
const char comment_delim[] = "#";
500
501
custom_argc = 1;
502
custom_argv = malloc(sizeof(char*) * 2);
503
if(custom_argv == NULL){
287
504
perror("malloc");
288
505
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
506
goto fallback;
507
}
508
custom_argv[0] = argv[0];
509
custom_argv[1] = NULL;
510
511
/* for each line in the config file, strip whitespace and ignore
512
commented text */
513
while(true){
514
sret = getline(&org_line, &size, conffp);
515
if(sret == -1){
516
break;
517
}
518
519
line = org_line;
520
arg = strsep(&line, comment_delim);
521
while((p = strsep(&arg, whitespace_delims)) != NULL){
522
if(p[0] == '\0'){
523
continue;
524
}
525
new_arg = strdup(p);
526
if(new_arg == NULL){
527
perror("strdup");
528
exitstatus = EXIT_FAILURE;
529
free(org_line);
530
goto fallback;
531
}
532
533
custom_argc += 1;
534
custom_argv = realloc(custom_argv, sizeof(char *)
535
* ((unsigned int) custom_argc + 1));
536
if(custom_argv == NULL){
537
perror("realloc");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
custom_argv[custom_argc-1] = new_arg;
543
custom_argv[custom_argc] = NULL;
544
}
545
}
546
free(org_line);
547
} else{
548
/* Check for harmful errors and go to fallback. Other errors might
549
not affect opening plugins */
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
551
perror("fopen");
552
exitstatus = EXIT_FAILURE;
553
goto fallback;
554
}
555
}
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
558
if(custom_argv != NULL){
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
560
if (ret == ARGP_ERR_UNKNOWN){
561
fprintf(stderr, "Unknown error while parsing arguments\n");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
564
}
308
565
}
309
566
310
567
if(debug){
314
571
for(char **a = p->argv; *a != NULL; a++){
315
572
fprintf(stderr, "\tArg: %s\n", *a);
316
573
}
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
575
for(char **a = p->environ; *a != NULL; a++){
576
fprintf(stderr, "\t%s\n", *a);
577
}
317
578
}
318
579
}
319
580
581
/* Strip permissions down to nobody */
320
582
ret = setuid(uid);
321
583
if (ret == -1){
322
584
perror("setuid");
323
}
324
585
}
325
586
setgid(gid);
326
587
if (ret == -1){
327
588
perror("setgid");
328
589
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
329
596
330
dir = opendir(plugindir);
331
597
if(dir == NULL){
332
598
perror("Could not open plugin dir");
333
599
exitstatus = EXIT_FAILURE;
334
goto end;
600
goto fallback;
335
601
}
336
602
337
603
/* Set the FD_CLOEXEC flag on the directory, if possible */
342
608
if(ret < 0){
343
609
perror("set_cloexec_flag");
344
610
exitstatus = EXIT_FAILURE;
345
goto end;
611
goto fallback;
346
612
}
347
613
}
348
614
}
349
615
350
616
FD_ZERO(&rfds_all);
351
617
618
/* Read and execute any executable in the plugin directory*/
352
619
while(true){
353
620
dirst = readdir(dir);
354
621
355
622
// All directory entries have been processed
356
623
if(dirst == NULL){
624
if (errno == EBADF){
625
perror("readdir");
626
exitstatus = EXIT_FAILURE;
627
goto fallback;
628
}
357
629
break;
358
630
}
359
631
380
652
break;
381
653
}
382
654
}
383
384
655
if(bad_name){
385
656
continue;
386
657
}
387
388
658
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
389
659
size_t suf_len = strlen(*suf);
390
660
if((d_name_len >= suf_len)
403
673
continue;
404
674
}
405
675
}
406
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
681
continue;
682
}
683
684
ret = stat(filename, &st);
685
if (ret == -1){
686
perror("stat");
687
free(filename);
688
continue;
689
}
690
691
/* Ignore non-executable files */
419
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
420
693
if(debug){
421
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
424
697
free(filename);
425
698
continue;
426
699
}
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
700
701
plugin *p = getplugin(dirst->d_name);
702
if(p == NULL){
703
perror("getplugin");
704
free(filename);
705
continue;
706
}
707
if(p->disabled){
428
708
if(debug){
429
709
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
430
710
dirst->d_name);
432
712
free(filename);
433
713
continue;
434
714
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
436
715
{
437
716
/* Add global arguments to argument list for this plugin */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
717
plugin *g = getplugin(NULL);
718
if(g != NULL){
719
for(char **a = g->argv + 1; *a != NULL; a++){
720
if(not add_argument(p, *a)){
721
perror("add_argument");
722
}
723
}
724
/* Add global environment variables */
725
for(char **e = g->environ; *e != NULL; e++){
726
if(not add_environment(p, *e)){
727
perror("add_environment");
728
}
729
}
730
}
731
}
732
/* If this plugin has any environment variables, we will call
733
using execve and need to duplicate the environment from this
734
process, too. */
735
if(p->environ[0] != NULL){
736
for(char **e = environ; *e != NULL; e++){
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
743
perror("add_environment");
744
}
745
}
746
}
747
748
int pipefd[2];
444
749
ret = pipe(pipefd);
445
750
if (ret == -1){
446
751
perror("pipe");
447
752
exitstatus = EXIT_FAILURE;
448
goto end;
753
goto fallback;
449
754
}
755
/* Ask OS to automatic close the pipe on exec */
450
756
ret = set_cloexec_flag(pipefd[0]);
451
757
if(ret < 0){
452
758
perror("set_cloexec_flag");
453
759
exitstatus = EXIT_FAILURE;
454
goto end;
760
goto fallback;
455
761
}
456
762
ret = set_cloexec_flag(pipefd[1]);
457
763
if(ret < 0){
458
764
perror("set_cloexec_flag");
459
765
exitstatus = EXIT_FAILURE;
460
goto end;
766
goto fallback;
461
767
}
462
768
/* Block SIGCHLD until process is safely in process list */
463
769
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
464
770
if(ret < 0){
465
771
perror("sigprocmask");
466
772
exitstatus = EXIT_FAILURE;
467
goto end;
773
goto fallback;
468
774
}
469
775
// Starting a new process to be watched
470
776
pid_t pid = fork();
777
if(pid == -1){
778
perror("fork");
779
exitstatus = EXIT_FAILURE;
780
goto fallback;
781
}
471
782
if(pid == 0){
472
783
/* this is the child process */
473
784
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
480
791
perror("sigprocmask");
481
792
_exit(EXIT_FAILURE);
482
793
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
794
795
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
796
if(ret == -1){
797
perror("dup2");
798
_exit(EXIT_FAILURE);
799
}
484
800
485
801
if(dirfd(dir) < 0){
486
802
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
803
above and must now close it manually here. */
488
804
closedir(dir);
489
805
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
806
if(p->environ[0] == NULL){
807
if(execv(filename, p->argv) < 0){
808
perror("execv");
809
_exit(EXIT_FAILURE);
810
}
811
} else {
812
if(execve(filename, p->argv, p->environ) < 0){
813
perror("execve");
814
_exit(EXIT_FAILURE);
815
}
493
816
}
494
817
/* no return */
495
818
}
496
/* parent process */
819
/* Parent process */
820
close(pipefd[1]); /* Close unused write end of pipe */
497
821
free(filename);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
502
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
503
826
if(ret < 0){
504
perror("sigprocmask");
827
perror("sigprocmask");
505
828
}
506
829
exitstatus = EXIT_FAILURE;
507
goto end;
830
goto fallback;
508
831
}
509
832
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
833
new_plugin->pid = pid;
834
new_plugin->fd = pipefd[0];
835
515
836
/* Unblock SIGCHLD so signal handler can be run if this process
516
837
has already completed */
517
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
518
839
if(ret < 0){
519
840
perror("sigprocmask");
520
841
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
842
goto fallback;
843
}
844
845
FD_SET(new_plugin->fd, &rfds_all);
846
847
if (maxfd < new_plugin->fd){
848
maxfd = new_plugin->fd;
849
}
850
537
851
}
538
852
539
853
closedir(dir);
540
854
dir = NULL;
541
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
855
856
for(plugin *p = plugin_list; p != NULL; p = p->next){
857
if(p->pid != 0){
858
break;
859
}
860
if(p->next == NULL){
861
fprintf(stderr, "No plugin processes started. Incorrect plugin"
862
" directory?\n");
863
free_plugin_list();
864
}
546
865
}
547
while(process_list){
866
867
/* Main loop while running plugins exist */
868
while(plugin_list){
548
869
fd_set rfds = rfds_all;
549
870
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
871
if (select_ret == -1){
551
872
perror("select");
552
873
exitstatus = EXIT_FAILURE;
553
goto end;
874
goto fallback;
554
875
}
555
876
/* OK, now either a process completed, or something can be read
556
877
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
558
879
/* Is this process completely done? */
559
880
if(proc->eof and proc->completed){
560
881
/* Only accept the plugin output if it exited cleanly */
561
882
if(not WIFEXITED(proc->status)
562
883
or WEXITSTATUS(proc->status) != 0){
563
884
/* Bad exit by plugin */
885
564
886
if(debug){
565
887
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
888
fprintf(stderr, "Plugin %u exited with status %d\n",
889
(unsigned int) (proc->pid),
890
WEXITSTATUS(proc->status));
568
891
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
892
fprintf(stderr, "Plugin %u killed by signal %d\n",
893
(unsigned int) (proc->pid),
894
WTERMSIG(proc->status));
571
895
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
896
fprintf(stderr, "Plugin %d dumped core\n",
897
(unsigned int) (proc->pid));
573
898
}
574
899
}
900
575
901
/* Remove the plugin */
576
902
FD_CLR(proc->fd, &rfds_all);
903
577
904
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
579
906
if(ret < 0){
580
907
perror("sigprocmask");
581
908
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
909
goto fallback;
910
}
911
free_plugin(proc);
597
912
/* We are done modifying process list, so unblock signal */
598
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
914
NULL);
600
915
if(ret < 0){
601
916
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
917
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
921
if(plugin_list == NULL){
922
break;
923
}
924
continue;
609
925
}
926
610
927
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
928
929
bool bret = print_out_password(proc->buffer,
930
proc->buffer_length);
931
if(not bret){
932
perror("print_out_password");
933
exitstatus = EXIT_FAILURE;
622
934
}
623
goto end;
935
goto fallback;
624
936
}
937
625
938
/* This process has not completed. Does it have any output? */
626
939
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
940
/* This process had nothing to say at this time */
634
947
if (proc->buffer == NULL){
635
948
perror("malloc");
636
949
exitstatus = EXIT_FAILURE;
637
goto end;
950
goto fallback;
638
951
}
639
952
proc->buffer_size += BUFFER_SIZE;
640
953
}
653
966
}
654
967
}
655
968
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
969
970
971
fallback:
972
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
974
/* Fallback if all plugins failed, none are found or an error
975
occured */
976
bool bret;
977
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
978
char *passwordbuffer = getpass("Password: ");
979
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
980
if(not bret){
981
perror("print_out_password");
982
exitstatus = EXIT_FAILURE;
983
}
659
984
}
660
985
661
end:
662
986
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
987
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
988
if(ret == -1){
989
perror("sigaction");
990
exitstatus = EXIT_FAILURE;
991
}
992
993
if(custom_argv != NULL){
994
for(char **arg = custom_argv+1; *arg != NULL; arg++){
995
free(*arg);
996
}
997
free(custom_argv);
672
998
}
673
999
674
1000
if(dir != NULL){
676
1002
}
677
1003
678
1004
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1005
for(plugin *p = plugin_list; p != NULL; p = p->next){
1006
if(p->pid != 0){
1007
close(p->fd);
1008
ret = kill(p->pid, SIGTERM);
1009
if(ret == -1 and errno != ESRCH){
1010
/* Set-uid proccesses might not get closed */
1011
perror("kill");
1012
}
1013
}
685
1014
}
686
1015
687
1016
/* Wait for any remaining child processes to terminate */
691
1020
if(errno != ECHILD){
692
1021
perror("wait");
693
1022
}
1023
1024
free_plugin_list();
1025
1026
free(plugindir);
1027
free(argfile);
694
1028
695
1029
return exitstatus;
696
1030
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0