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- Committer: Björn Påhlsson
- Date: 2008-08-10 00:18:25 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 59.
- Revision ID: belorn@braxen-20080810001825-nxr0rza1hclj4mr7
version 1.0
- 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() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
66
67
67
#define BUFFER_SIZE 256
68
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";
69
const char *argp_program_version = "plugbasedclient 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
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*/
72
struct process;
73
74
typedef struct process{
86
75
pid_t pid;
87
76
int fd;
88
77
char *buffer;
89
78
size_t buffer_size;
90
79
size_t buffer_length;
91
80
bool eof;
92
volatile bool completed;
93
volatile int status;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
94
91
struct plugin *next;
95
92
} plugin;
96
93
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){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
96
if ((p->name == name)
105
97
or (p->name and name and (strcmp(p->name, name) == 0))){
106
98
return p;
109
101
/* Create a new plugin */
110
102
plugin *new_plugin = malloc(sizeof(plugin));
111
103
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
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
127
108
new_plugin->argv = malloc(sizeof(char *) * 2);
128
109
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
132
112
}
133
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
134
114
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
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
145
118
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
147
120
return new_plugin;
148
121
}
149
122
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));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
204
132
}
205
133
206
134
/*
219
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
148
}
221
149
150
process *process_list = NULL;
222
151
223
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
224
153
status. */
225
154
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
}
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
305
171
}
306
172
307
173
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
311
175
size_t d_name_len;
312
176
DIR *dir = NULL;
313
177
struct dirent *dirst;
321
185
struct sigaction old_sigchld_action;
322
186
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
187
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
326
190
327
191
/* Establish a signal handler */
328
192
sigemptyset(&sigchld_action.sa_mask);
329
193
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
194
if(ret < 0){
331
195
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
196
exit(EXIT_FAILURE);
334
197
}
335
198
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
199
if(ret < 0){
337
200
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
201
exit(EXIT_FAILURE);
340
202
}
341
203
342
204
/* The options we understand. */
344
206
{ .name = "global-options", .key = 'g',
345
207
.arg = "OPTION[,OPTION[,...]]",
346
208
.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
209
{ .name = "options-for", .key = 'o',
351
210
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
211
.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
212
{ .name = "disable", .key = 'd',
357
213
.arg = "PLUGIN",
358
214
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
362
215
{ .name = "plugin-dir", .key = 128,
363
216
.arg = "DIRECTORY",
364
217
.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 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
376
226
{ .name = NULL }
377
227
};
378
228
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
381
233
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 */
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
470
265
uid = (uid_t)strtol(arg, NULL, 10);
471
266
break;
472
case 131: /* --groupid */
267
case 130:
473
268
gid = (gid_t)strtol(arg, NULL, 10);
474
269
break;
475
case 132: /* --debug */
270
case 131:
476
271
debug = true;
477
272
break;
478
273
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");
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
508
276
}
509
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
513
case ARGP_KEY_ARG:
277
plus_options = arg;
278
break;
514
279
case ARGP_KEY_END:
515
280
break;
516
281
default:
519
284
return 0;
520
285
}
521
286
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
287
plugin *plugin_list = NULL;
288
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
525
291
.doc = "Mandos plugin runner -- Run plugins" };
526
292
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);
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
530
294
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
295
fprintf(stderr, "Unkown error while parsing arguments\n");
532
296
exitstatus = EXIT_FAILURE;
533
goto fallback;
297
goto end;
534
298
}
535
299
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){
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
556
310
perror("malloc");
557
311
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);
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
613
331
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
332
fprintf(stderr, "Unkown error while parsing arguments\n");
615
333
exitstatus = EXIT_FAILURE;
616
goto fallback;
334
goto end;
617
335
}
618
336
}
619
337
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
629
338
if(debug){
630
339
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
340
fprintf(stderr, "Plugin: %s has %d arguments\n",
633
342
for(char **a = p->argv; *a != NULL; a++){
634
343
fprintf(stderr, "\tArg: %s\n", *a);
635
344
}
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
345
}
641
346
}
642
347
643
/* Strip permissions down to nobody */
644
348
ret = setuid(uid);
645
349
if (ret == -1){
646
350
perror("setuid");
647
}
351
}
352
648
353
setgid(gid);
649
354
if (ret == -1){
650
355
perror("setgid");
651
356
}
652
357
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
358
dir = opendir(plugindir);
659
359
if(dir == NULL){
660
360
perror("Could not open plugin dir");
661
361
exitstatus = EXIT_FAILURE;
662
goto fallback;
362
goto end;
663
363
}
664
364
665
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
670
370
if(ret < 0){
671
371
perror("set_cloexec_flag");
672
372
exitstatus = EXIT_FAILURE;
673
goto fallback;
373
goto end;
674
374
}
675
375
}
676
376
}
677
377
678
378
FD_ZERO(&rfds_all);
679
379
680
/* Read and execute any executable in the plugin directory*/
681
380
while(true){
682
381
dirst = readdir(dir);
683
382
684
/* All directory entries have been processed */
383
// All directory entries have been processed
685
384
if(dirst == NULL){
686
385
if (errno == EBADF){
687
386
perror("readdir");
688
387
exitstatus = EXIT_FAILURE;
689
goto fallback;
388
goto end;
690
389
}
691
390
break;
692
391
}
693
392
694
393
d_name_len = strlen(dirst->d_name);
695
394
696
/* Ignore dotfiles, backup files and other junk */
395
// Ignore dotfiles, backup files and other junk
697
396
{
698
397
bool bad_name = false;
699
398
714
413
break;
715
414
}
716
415
}
416
717
417
if(bad_name){
718
418
continue;
719
419
}
420
720
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
721
422
size_t suf_len = strlen(*suf);
722
423
if((d_name_len >= suf_len)
735
436
continue;
736
437
}
737
438
}
738
739
char *filename;
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
if(ret < 0){
742
perror("asprintf");
743
continue;
439
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
744
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
745
449
746
450
ret = stat(filename, &st);
747
451
if (ret == -1){
748
452
perror("stat");
749
free(filename);
750
continue;
453
exitstatus = EXIT_FAILURE;
454
goto end;
751
455
}
752
753
/* Ignore non-executable files */
456
754
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
755
458
if(debug){
756
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
759
462
free(filename);
760
463
continue;
761
464
}
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){
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
770
466
if(debug){
771
467
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
772
468
dirst->d_name);
774
470
free(filename);
775
471
continue;
776
472
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
777
474
{
778
475
/* 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];
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
806
482
ret = pipe(pipefd);
807
483
if (ret == -1){
808
484
perror("pipe");
809
485
exitstatus = EXIT_FAILURE;
810
goto fallback;
486
goto end;
811
487
}
812
/* Ask OS to automatic close the pipe on exec */
813
488
ret = set_cloexec_flag(pipefd[0]);
814
489
if(ret < 0){
815
490
perror("set_cloexec_flag");
816
491
exitstatus = EXIT_FAILURE;
817
goto fallback;
492
goto end;
818
493
}
819
494
ret = set_cloexec_flag(pipefd[1]);
820
495
if(ret < 0){
821
496
perror("set_cloexec_flag");
822
497
exitstatus = EXIT_FAILURE;
823
goto fallback;
498
goto end;
824
499
}
825
500
/* Block SIGCHLD until process is safely in process list */
826
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
827
502
if(ret < 0){
828
503
perror("sigprocmask");
829
504
exitstatus = EXIT_FAILURE;
830
goto fallback;
505
goto end;
831
506
}
832
/* Starting a new process to be watched */
507
// Starting a new process to be watched
833
508
pid_t pid = fork();
834
if(pid == -1){
835
perror("fork");
836
exitstatus = EXIT_FAILURE;
837
goto fallback;
838
}
839
509
if(pid == 0){
840
510
/* this is the child process */
841
511
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
860
530
above and must now close it manually here. */
861
531
closedir(dir);
862
532
}
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
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
873
536
}
874
537
/* no return */
875
538
}
876
/* Parent process */
877
close(pipefd[1]); /* Close unused write end of pipe */
539
/* parent process */
878
540
free(filename);
879
plugin *new_plugin = getplugin(dirst->d_name);
880
if (new_plugin == NULL){
881
perror("getplugin");
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
882
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
883
546
if(ret < 0){
884
perror("sigprocmask");
547
perror("sigprocmask");
885
548
}
886
549
exitstatus = EXIT_FAILURE;
887
goto fallback;
550
goto end;
888
551
}
889
552
890
new_plugin->pid = pid;
891
new_plugin->fd = pipefd[0];
892
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
893
558
/* Unblock SIGCHLD so signal handler can be run if this process
894
559
has already completed */
895
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
896
561
if(ret < 0){
897
562
perror("sigprocmask");
898
563
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
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
908
580
}
909
581
910
582
closedir(dir);
911
583
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
}
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
922
589
}
923
924
/* Main loop while running plugins exist */
925
while(plugin_list){
590
while(process_list){
926
591
fd_set rfds = rfds_all;
927
592
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
928
593
if (select_ret == -1){
929
594
perror("select");
930
595
exitstatus = EXIT_FAILURE;
931
goto fallback;
596
goto end;
932
597
}
933
598
/* OK, now either a process completed, or something can be read
934
599
from one of them */
935
for(plugin *proc = plugin_list; proc != NULL;){
600
for(process *proc = process_list; proc ; proc = proc->next){
936
601
/* Is this process completely done? */
937
602
if(proc->eof and proc->completed){
938
603
/* Only accept the plugin output if it exited cleanly */
939
604
if(not WIFEXITED(proc->status)
940
605
or WEXITSTATUS(proc->status) != 0){
941
606
/* Bad exit by plugin */
942
943
607
if(debug){
944
608
if(WIFEXITED(proc->status)){
945
fprintf(stderr, "Plugin %u exited with status %d\n",
946
(unsigned int) (proc->pid),
947
WEXITSTATUS(proc->status));
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
948
611
} else if(WIFSIGNALED(proc->status)) {
949
fprintf(stderr, "Plugin %u killed by signal %d\n",
950
(unsigned int) (proc->pid),
951
WTERMSIG(proc->status));
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
952
614
} else if(WCOREDUMP(proc->status)){
953
fprintf(stderr, "Plugin %d dumped core\n",
954
(unsigned int) (proc->pid));
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
955
616
}
956
617
}
957
958
618
/* Remove the plugin */
959
619
FD_CLR(proc->fd, &rfds_all);
960
961
620
/* Block signal while modifying process_list */
962
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
622
if(ret < 0){
964
623
perror("sigprocmask");
965
624
exitstatus = EXIT_FAILURE;
966
goto fallback;
967
}
968
625
goto end;
626
}
627
/* Delete this process entry from the list */
628
if(process_list == proc){
629
/* First one - simple */
630
process_list = proc->next;
631
} else {
632
/* Second one or later */
633
for(process *p = process_list; p != NULL; p = p->next){
634
if(p->next == proc){
635
p->next = proc->next;
636
break;
637
}
638
}
639
}
969
640
/* We are done modifying process list, so unblock signal */
970
641
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
971
642
NULL);
972
643
if(ret < 0){
973
644
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;
645
}
646
free(proc->buffer);
647
free(proc);
648
/* We deleted this process from the list, so we can't go
649
proc->next. Therefore, start over from the beginning of
650
the process list */
651
break;
986
652
}
987
988
653
/* 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;
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
658
proc->buffer_length
659
- written));
660
if(ret < 0){
661
perror("write");
662
exitstatus = EXIT_FAILURE;
663
goto end;
664
}
995
665
}
996
goto fallback;
666
goto end;
997
667
}
998
999
668
/* This process has not completed. Does it have any output? */
1000
669
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1001
670
/* This process had nothing to say at this time */
1002
proc = proc->next;
1003
671
continue;
1004
672
}
1005
673
/* Before reading, make the process' data buffer large enough */
1009
677
if (proc->buffer == NULL){
1010
678
perror("malloc");
1011
679
exitstatus = EXIT_FAILURE;
1012
goto fallback;
680
goto end;
1013
681
}
1014
682
proc->buffer_size += BUFFER_SIZE;
1015
683
}
1018
686
BUFFER_SIZE);
1019
687
if(ret < 0){
1020
688
/* Read error from this process; ignore the error */
1021
proc = proc->next;
1022
689
continue;
1023
690
}
1024
691
if(ret == 0){
1029
696
}
1030
697
}
1031
698
}
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
}
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
1047
702
}
1048
703
704
end:
1049
705
/* 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);
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
707
708
free(plus_argv);
709
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
714
free(plugin_list);
1061
715
}
1062
716
1063
717
if(dir != NULL){
1065
719
}
1066
720
1067
721
/* 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
}
722
for(process *next; process_list != NULL; process_list = next){
723
next = process_list->next;
724
close(process_list->fd);
725
ret = kill(process_list->pid, SIGTERM);
726
if(ret == -1 and errno != ESRCH){
727
/* set-uid proccesses migth not get closed */
728
perror("kill");
1076
729
}
730
free(process_list->buffer);
731
free(process_list);
1077
732
}
1078
733
1079
734
/* Wait for any remaining child processes to terminate */
1083
738
if(errno != ECHILD){
1084
739
perror("wait");
1085
740
}
1086
1087
free_plugin_list();
1088
1089
free(plugindir);
1090
free(argfile);
1091
741
1092
742
return exitstatus;
1093
743
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0