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- Committer: Björn Påhlsson
- Date: 2008-08-08 02:33:41 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 50.
- Revision ID: belorn@braxen-20080808023341-34aft2vw4f35nzam
* clients.conf.xml: Renamed to "mandos-clients.conf.xml".
* Makefile (DOCBOOKTOMAN, DOCS): New
(all): Include $(DOCS)
(%.5: %.xml, %.8: %.xml, %.8mandos: %.xml): New.
(clean): Also remove $(DOCS)
* Makefile (DOCBOOKTOMAN, DOCS): New
(all): Include $(DOCS)
(%.5: %.xml, %.8: %.xml, %.8mandos: %.xml): New.
(clean): Also remove $(DOCS)
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- files modified:
- Makefile
added
removed
mandos-client.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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
42
28
#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() */
43
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
37
#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() */
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() */
55
48
#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 */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
66
52
67
53
#define BUFFER_SIZE 256
68
54
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*/
55
struct process;
56
57
typedef struct process{
86
58
pid_t pid;
87
59
int fd;
88
60
char *buffer;
89
61
size_t buffer_size;
90
62
size_t buffer_length;
91
63
bool eof;
92
volatile bool completed;
93
volatile int status;
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;
94
74
struct plugin *next;
95
75
} plugin;
96
76
97
static plugin *plugin_list = NULL;
98
99
/* Gets an 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){
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
79
if ((p->name == name)
105
80
or (p->name and name and (strcmp(p->name, name) == 0))){
106
81
return p;
109
84
/* Create a new plugin */
110
85
plugin *new_plugin = malloc(sizeof(plugin));
111
86
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
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
127
91
new_plugin->argv = malloc(sizeof(char *) * 2);
128
92
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
93
perror("malloc");
94
exit(EXIT_FAILURE);
132
95
}
133
new_plugin->argv[0] = copy_name;
96
new_plugin->argv[0] = name;
134
97
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
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
145
101
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
102
*plugin_list = new_plugin;
147
103
return new_plugin;
148
104
}
149
105
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) + 1);
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));
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;
204
115
}
205
116
206
117
/*
219
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
131
}
221
132
222
223
/* Mark processes as completed when they exit, and save their exit
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
224
139
status. */
225
140
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
}
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;
305
153
}
306
154
307
155
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
311
157
size_t d_name_len;
312
158
DIR *dir = NULL;
313
159
struct dirent *dirst;
321
167
struct sigaction old_sigchld_action;
322
168
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
169
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
326
172
327
173
/* Establish a signal handler */
328
174
sigemptyset(&sigchld_action.sa_mask);
329
175
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
176
if(ret < 0){
331
177
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
178
exit(EXIT_FAILURE);
334
179
}
335
180
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
181
if(ret < 0){
337
182
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
183
exit(EXIT_FAILURE);
340
184
}
341
185
342
186
/* The options we understand. */
344
188
{ .name = "global-options", .key = 'g',
345
189
.arg = "OPTION[,OPTION[,...]]",
346
190
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
350
191
{ .name = "options-for", .key = 'o',
351
192
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
193
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'E',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
194
{ .name = "disable", .key = 'd',
357
195
.arg = "PLUGIN",
358
196
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
362
197
{ .name = "plugin-dir", .key = 128,
363
198
.arg = "DIRECTORY",
364
199
.doc = "Specify a different plugin directory", .group = 2 },
365
{ .name = "config-file", .key = 129,
366
.arg = "FILE",
367
.doc = "Specify a different configuration file", .group = 2 },
368
{ .name = "userid", .key = 130,
369
.arg = "ID", .flags = 0,
370
.doc = "User ID the plugins will run as", .group = 3 },
371
{ .name = "groupid", .key = 131,
372
.arg = "ID", .flags = 0,
373
.doc = "Group ID the plugins will run as", .group = 3 },
374
{ .name = "debug", .key = 132,
375
.doc = "Debug mode", .group = 4 },
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 },
376
208
{ .name = NULL }
377
209
};
378
210
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
381
215
switch (key) {
382
case 'g': /* --global-options */
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
393
}
394
}
395
break;
396
case 'G': /* --global-env */
397
if(arg == NULL){
398
break;
399
}
400
if(not add_environment(getplugin(NULL), arg, true)){
401
perror("add_environment");
402
}
403
break;
404
case 'o': /* --options-for */
405
if (arg != NULL){
406
char *p_name = strsep(&arg, ":");
407
if(p_name[0] == '\0' or arg == NULL){
408
break;
409
}
410
char *opt = strsep(&arg, ":");
411
if(opt[0] == '\0' or opt == NULL){
412
break;
413
}
414
char *p;
415
while((p = strsep(&opt, ",")) != NULL){
416
if(p[0] == '\0'){
417
continue;
418
}
419
if(not add_argument(getplugin(p_name), p)){
420
perror("add_argument");
421
return ARGP_ERR_UNKNOWN;
422
}
423
}
424
}
425
break;
426
case 'E': /* --env-for */
427
if(arg == NULL){
428
break;
429
}
430
{
431
char *envdef = strchr(arg, ':');
432
if(envdef == NULL){
433
break;
434
}
435
*envdef = '\0';
436
if(not add_environment(getplugin(arg), envdef+1, true)){
437
perror("add_environment");
438
}
439
}
440
break;
441
case 'd': /* --disable */
442
if (arg != NULL){
443
plugin *p = getplugin(arg);
444
if(p == NULL){
445
return ARGP_ERR_UNKNOWN;
446
}
447
p->disabled = true;
448
}
449
break;
450
case 'e': /* --enable */
451
if (arg != NULL){
452
plugin *p = getplugin(arg);
453
if(p == NULL){
454
return ARGP_ERR_UNKNOWN;
455
}
456
p->disabled = false;
457
}
458
break;
459
case 128: /* --plugin-dir */
460
free(plugindir);
461
plugindir = strdup(arg);
462
if(plugindir == NULL){
463
perror("strdup");
464
}
465
break;
466
case 129: /* --config-file */
467
/* This is already done by parse_opt_config_file() */
468
break;
469
case 130: /* --userid */
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:
470
247
uid = (uid_t)strtol(arg, NULL, 10);
471
248
break;
472
case 131: /* --groupid */
249
case 130:
473
250
gid = (gid_t)strtol(arg, NULL, 10);
474
251
break;
475
case 132: /* --debug */
252
case 131:
476
253
debug = true;
477
254
break;
478
255
case ARGP_KEY_ARG:
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
break;
481
case ARGP_KEY_END:
482
break;
483
default:
484
return ARGP_ERR_UNKNOWN;
485
}
486
return 0;
487
}
488
489
/* This option parser is the same as parse_opt() above, except it
490
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
495
case 'g': /* --global-options */
496
case 'G': /* --global-env */
497
case 'o': /* --options-for */
498
case 'E': /* --env-for */
499
case 'd': /* --disable */
500
case 'e': /* --enable */
501
case 128: /* --plugin-dir */
502
break;
503
case 129: /* --config-file */
504
free(argfile);
505
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
508
258
}
509
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
513
case ARGP_KEY_ARG:
259
plus_options = arg;
260
break;
514
261
case ARGP_KEY_END:
515
262
break;
516
263
default:
519
266
return 0;
520
267
}
521
268
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
525
273
.doc = "Mandos plugin runner -- Run plugins" };
526
274
527
/* Parse using the parse_opt_config_file in order to get the custom
528
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
532
exitstatus = EXIT_FAILURE;
533
goto fallback;
534
}
535
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
540
if (argfile == NULL){
541
conffp = fopen(AFILE, "r");
542
} else {
543
conffp = fopen(argfile, "r");
544
}
545
if(conffp != NULL){
546
char *org_line = NULL;
547
char *p, *arg, *new_arg, *line;
548
size_t size = 0;
549
ssize_t sret;
550
const char whitespace_delims[] = " \r\t\f\v\n";
551
const char comment_delim[] = "#";
552
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
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){
556
287
perror("malloc");
557
288
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
565
while(true){
566
sret = getline(&org_line, &size, conffp);
567
if(sret == -1){
568
break;
569
}
570
571
line = org_line;
572
arg = strsep(&line, comment_delim);
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
574
if(p[0] == '\0'){
575
continue;
576
}
577
new_arg = strdup(p);
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
596
}
597
}
598
free(org_line);
599
} else {
600
/* Check for harmful errors and go to fallback. Other errors might
601
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
605
goto fallback;
606
}
607
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
610
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
616
goto fallback;
617
}
618
}
619
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;
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);
627
308
}
628
309
629
310
if(debug){
633
314
for(char **a = p->argv; *a != NULL; a++){
634
315
fprintf(stderr, "\tArg: %s\n", *a);
635
316
}
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
317
}
641
318
}
642
319
643
/* Strip permissions down to nobody */
644
320
ret = setuid(uid);
645
321
if (ret == -1){
646
322
perror("setuid");
647
}
323
}
324
648
325
setgid(gid);
649
326
if (ret == -1){
650
327
perror("setgid");
651
328
}
652
329
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
330
dir = opendir(plugindir);
659
331
if(dir == NULL){
660
332
perror("Could not open plugin dir");
661
333
exitstatus = EXIT_FAILURE;
662
goto fallback;
334
goto end;
663
335
}
664
336
665
337
/* Set the FD_CLOEXEC flag on the directory, if possible */
670
342
if(ret < 0){
671
343
perror("set_cloexec_flag");
672
344
exitstatus = EXIT_FAILURE;
673
goto fallback;
345
goto end;
674
346
}
675
347
}
676
348
}
677
349
678
350
FD_ZERO(&rfds_all);
679
351
680
/* Read and execute any executable in the plugin directory*/
681
352
while(true){
682
353
dirst = readdir(dir);
683
354
684
/* All directory entries have been processed */
355
// All directory entries have been processed
685
356
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
691
357
break;
692
358
}
693
359
694
360
d_name_len = strlen(dirst->d_name);
695
361
696
/* Ignore dotfiles, backup files and other junk */
362
// Ignore dotfiles, backup files and other junk
697
363
{
698
364
bool bad_name = false;
699
365
714
380
break;
715
381
}
716
382
}
383
717
384
if(bad_name){
718
385
continue;
719
386
}
387
720
388
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
721
389
size_t suf_len = strlen(*suf);
722
390
if((d_name_len >= suf_len)
735
403
continue;
736
404
}
737
405
}
738
739
char *filename;
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
if(ret < 0){
742
perror("asprintf");
743
continue;
744
}
745
746
ret = stat(filename, &st);
747
if (ret == -1){
748
perror("stat");
749
free(filename);
750
continue;
751
}
752
753
/* Ignore non-executable files */
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
754
419
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
755
420
if(debug){
756
421
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
759
424
free(filename);
760
425
continue;
761
426
}
762
763
plugin *p = getplugin(dirst->d_name);
764
if(p == NULL){
765
perror("getplugin");
766
free(filename);
767
continue;
768
}
769
if(p->disabled){
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
770
428
if(debug){
771
429
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
772
430
dirst->d_name);
774
432
free(filename);
775
433
continue;
776
434
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
777
436
{
778
437
/* Add global arguments to argument list for this plugin */
779
plugin *g = getplugin(NULL);
780
if(g != NULL){
781
for(char **a = g->argv + 1; *a != NULL; a++){
782
if(not add_argument(p, *a)){
783
perror("add_argument");
784
}
785
}
786
/* Add global environment variables */
787
for(char **e = g->environ; *e != NULL; e++){
788
if(not add_environment(p, *e, false)){
789
perror("add_environment");
790
}
791
}
792
}
793
}
794
/* If this plugin has any environment variables, we will call
795
using execve and need to duplicate the environment from this
796
process, too. */
797
if(p->environ[0] != NULL){
798
for(char **e = environ; *e != NULL; e++){
799
if(not add_environment(p, *e, false)){
800
perror("add_environment");
801
}
802
}
803
}
804
805
int pipefd[2];
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];
806
444
ret = pipe(pipefd);
807
445
if (ret == -1){
808
446
perror("pipe");
809
447
exitstatus = EXIT_FAILURE;
810
goto fallback;
448
goto end;
811
449
}
812
/* Ask OS to automatic close the pipe on exec */
813
450
ret = set_cloexec_flag(pipefd[0]);
814
451
if(ret < 0){
815
452
perror("set_cloexec_flag");
816
453
exitstatus = EXIT_FAILURE;
817
goto fallback;
454
goto end;
818
455
}
819
456
ret = set_cloexec_flag(pipefd[1]);
820
457
if(ret < 0){
821
458
perror("set_cloexec_flag");
822
459
exitstatus = EXIT_FAILURE;
823
goto fallback;
460
goto end;
824
461
}
825
462
/* Block SIGCHLD until process is safely in process list */
826
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
827
464
if(ret < 0){
828
465
perror("sigprocmask");
829
466
exitstatus = EXIT_FAILURE;
830
goto fallback;
467
goto end;
831
468
}
832
/* Starting a new process to be watched */
469
// Starting a new process to be watched
833
470
pid_t pid = fork();
834
if(pid == -1){
835
perror("fork");
836
exitstatus = EXIT_FAILURE;
837
goto fallback;
838
}
839
471
if(pid == 0){
840
472
/* this is the child process */
841
473
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
848
480
perror("sigprocmask");
849
481
_exit(EXIT_FAILURE);
850
482
}
851
852
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
853
if(ret == -1){
854
perror("dup2");
855
_exit(EXIT_FAILURE);
856
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
857
484
858
485
if(dirfd(dir) < 0){
859
486
/* If dir has no file descriptor, we could not set FD_CLOEXEC
860
487
above and must now close it manually here. */
861
488
closedir(dir);
862
489
}
863
if(p->environ[0] == NULL){
864
if(execv(filename, p->argv) < 0){
865
perror("execv");
866
_exit(EXIT_FAILURE);
867
}
868
} else {
869
if(execve(filename, p->argv, p->environ) < 0){
870
perror("execve");
871
_exit(EXIT_FAILURE);
872
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
873
493
}
874
494
/* no return */
875
495
}
876
/* Parent process */
877
close(pipefd[1]); /* Close unused write end of pipe */
496
/* parent process */
878
497
free(filename);
879
plugin *new_plugin = getplugin(dirst->d_name);
880
if (new_plugin == NULL){
881
perror("getplugin");
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");
882
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
883
503
if(ret < 0){
884
perror("sigprocmask");
504
perror("sigprocmask");
885
505
}
886
506
exitstatus = EXIT_FAILURE;
887
goto fallback;
507
goto end;
888
508
}
889
509
890
new_plugin->pid = pid;
891
new_plugin->fd = pipefd[0];
892
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
893
515
/* Unblock SIGCHLD so signal handler can be run if this process
894
516
has already completed */
895
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
896
518
if(ret < 0){
897
519
perror("sigprocmask");
898
520
exitstatus = EXIT_FAILURE;
899
goto fallback;
900
}
901
902
FD_SET(new_plugin->fd, &rfds_all);
903
904
if (maxfd < new_plugin->fd){
905
maxfd = new_plugin->fd;
906
}
907
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);
908
537
}
909
538
910
539
closedir(dir);
911
540
dir = NULL;
912
913
for(plugin *p = plugin_list; p != NULL; p = p->next){
914
if(p->pid != 0){
915
break;
916
}
917
if(p->next == NULL){
918
fprintf(stderr, "No plugin processes started. Incorrect plugin"
919
" directory?\n");
920
free_plugin_list();
921
}
541
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
922
546
}
923
924
/* Main loop while running plugins exist */
925
while(plugin_list){
547
while(process_list){
926
548
fd_set rfds = rfds_all;
927
549
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
928
550
if (select_ret == -1){
929
551
perror("select");
930
552
exitstatus = EXIT_FAILURE;
931
goto fallback;
553
goto end;
932
554
}
933
555
/* OK, now either a process completed, or something can be read
934
556
from one of them */
935
for(plugin *proc = plugin_list; proc != NULL;){
557
for(process *proc = process_list; proc ; proc = proc->next){
936
558
/* Is this process completely done? */
937
559
if(proc->eof and proc->completed){
938
560
/* Only accept the plugin output if it exited cleanly */
939
561
if(not WIFEXITED(proc->status)
940
562
or WEXITSTATUS(proc->status) != 0){
941
563
/* Bad exit by plugin */
942
943
564
if(debug){
944
565
if(WIFEXITED(proc->status)){
945
fprintf(stderr, "Plugin %u exited with status %d\n",
946
(unsigned int) (proc->pid),
947
WEXITSTATUS(proc->status));
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
948
568
} else if(WIFSIGNALED(proc->status)) {
949
fprintf(stderr, "Plugin %u killed by signal %d\n",
950
(unsigned int) (proc->pid),
951
WTERMSIG(proc->status));
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
952
571
} else if(WCOREDUMP(proc->status)){
953
fprintf(stderr, "Plugin %d dumped core\n",
954
(unsigned int) (proc->pid));
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
955
573
}
956
574
}
957
958
575
/* Remove the plugin */
959
576
FD_CLR(proc->fd, &rfds_all);
960
961
577
/* Block signal while modifying process_list */
962
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
579
if(ret < 0){
964
580
perror("sigprocmask");
965
581
exitstatus = EXIT_FAILURE;
966
goto fallback;
967
}
968
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
}
969
597
/* We are done modifying process list, so unblock signal */
970
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
971
599
NULL);
972
600
if(ret < 0){
973
601
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
975
goto fallback;
976
}
977
978
if(plugin_list == NULL){
979
break;
980
}
981
982
plugin *next_plugin = proc->next;
983
free_plugin(proc);
984
proc = next_plugin;
985
continue;
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;
986
609
}
987
988
610
/* This process exited nicely, so print its buffer */
989
990
bool bret = print_out_password(proc->buffer,
991
proc->buffer_length);
992
if(not bret){
993
perror("print_out_password");
994
exitstatus = EXIT_FAILURE;
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
}
995
622
}
996
goto fallback;
623
goto end;
997
624
}
998
999
625
/* This process has not completed. Does it have any output? */
1000
626
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1001
627
/* This process had nothing to say at this time */
1002
proc = proc->next;
1003
628
continue;
1004
629
}
1005
630
/* Before reading, make the process' data buffer large enough */
1009
634
if (proc->buffer == NULL){
1010
635
perror("malloc");
1011
636
exitstatus = EXIT_FAILURE;
1012
goto fallback;
637
goto end;
1013
638
}
1014
639
proc->buffer_size += BUFFER_SIZE;
1015
640
}
1018
643
BUFFER_SIZE);
1019
644
if(ret < 0){
1020
645
/* Read error from this process; ignore the error */
1021
proc = proc->next;
1022
646
continue;
1023
647
}
1024
648
if(ret == 0){
1029
653
}
1030
654
}
1031
655
}
1032
1033
1034
fallback:
1035
1036
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1037
/* Fallback if all plugins failed, none are found or an error
1038
occured */
1039
bool bret;
1040
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1041
char *passwordbuffer = getpass("Password: ");
1042
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1043
if(not bret){
1044
perror("print_out_password");
1045
exitstatus = EXIT_FAILURE;
1046
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1047
659
}
1048
660
661
end:
1049
662
/* Restore old signal handler */
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
if(ret == -1){
1052
perror("sigaction");
1053
exitstatus = EXIT_FAILURE;
1054
}
1055
1056
if(custom_argv != NULL){
1057
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1058
free(*arg);
1059
}
1060
free(custom_argv);
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);
1061
672
}
1062
673
1063
674
if(dir != NULL){
1065
676
}
1066
677
1067
678
/* Free the process list and kill the processes */
1068
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
if(p->pid != 0){
1070
close(p->fd);
1071
ret = kill(p->pid, SIGTERM);
1072
if(ret == -1 and errno != ESRCH){
1073
/* Set-uid proccesses might not get closed */
1074
perror("kill");
1075
}
1076
}
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);
1077
685
}
1078
686
1079
687
/* Wait for any remaining child processes to terminate */
1083
691
if(errno != ECHILD){
1084
692
perror("wait");
1085
693
}
1086
1087
free_plugin_list();
1088
1089
free(plugindir);
1090
free(argfile);
1091
694
1092
695
return exitstatus;
1093
696
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0