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- Committer: Teddy Hogeborn
- Date: 2008-08-12 19:22:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20080812192234-8bm17713ltih9ud1
* initramfs-tools-hook: New.
* initramfs-tools-hook-conf: New.
* initramfs-tools-hook-conf: New.
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
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 = "mandos-client 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
}
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;
253
171
}
254
172
255
/* Prints out a password to stdout */
256
173
bool print_out_password(const char *buffer, size_t length){
257
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
258
178
for(size_t written = 0; written < length; written += (size_t)ret){
259
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
180
length - written));
265
185
return true;
266
186
}
267
187
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
302
}
303
304
188
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
307
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
190
size_t d_name_len;
309
191
DIR *dir = NULL;
310
192
struct dirent *dirst;
318
200
struct sigaction old_sigchld_action;
319
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
320
202
.sa_flags = SA_NOCLDSTOP };
321
char **custom_argv = NULL;
322
int custom_argc = 0;
323
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
324
206
/* Establish a signal handler */
325
207
sigemptyset(&sigchld_action.sa_mask);
326
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
if(ret == -1){
209
if(ret < 0){
328
210
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
211
exit(EXIT_FAILURE);
331
212
}
332
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
if(ret == -1){
214
if(ret < 0){
334
215
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
216
exit(EXIT_FAILURE);
337
217
}
338
218
339
219
/* The options we understand. */
341
221
{ .name = "global-options", .key = 'g',
342
222
.arg = "OPTION[,OPTION[,...]]",
343
223
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
345
.arg = "VAR=value",
346
.doc = "Environment variable passed to all plugins" },
347
224
{ .name = "options-for", .key = 'o',
348
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
226
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
351
.arg = "PLUGIN:ENV=value",
352
.doc = "Environment variable passed to specified plugin" },
353
227
{ .name = "disable", .key = 'd',
354
228
.arg = "PLUGIN",
355
229
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
359
230
{ .name = "plugin-dir", .key = 128,
360
231
.arg = "DIRECTORY",
361
232
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
373
241
{ .name = NULL }
374
242
};
375
243
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
378
248
switch (key) {
379
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
390
}
391
}
392
break;
393
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
425
}
426
}
427
}
428
break;
429
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
{
434
char *envdef = strchr(arg, ':');
435
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
442
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
445
}
446
}
447
break;
448
case 'd': /* --disable */
449
if (arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = true;
455
}
456
break;
457
case 'e': /* --enable */
458
if (arg != NULL){
459
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
462
}
463
p->disabled = false;
464
}
465
break;
466
case 128: /* --plugin-dir */
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
471
break;
472
case 129: /* --config-file */
473
/* This is already done by parse_opt_config_file() */
474
break;
475
case 130: /* --userid */
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
476
280
uid = (uid_t)strtol(arg, NULL, 10);
477
281
break;
478
case 131: /* --groupid */
282
case 130:
479
283
gid = (gid_t)strtol(arg, NULL, 10);
480
284
break;
481
case 132: /* --debug */
285
case 131:
482
286
debug = true;
483
287
break;
484
288
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
489
default:
490
return ARGP_ERR_UNKNOWN;
491
}
492
return 0;
493
}
494
495
/* This option parser is the same as parse_opt() above, except it
496
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
501
case 'g': /* --global-options */
502
case 'G': /* --global-env */
503
case 'o': /* --options-for */
504
case 'E': /* --env-for */
505
case 'd': /* --disable */
506
case 'e': /* --enable */
507
case 128: /* --plugin-dir */
508
break;
509
case 129: /* --config-file */
510
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
513
291
}
514
break;
515
case 130: /* --userid */
516
case 131: /* --groupid */
517
case 132: /* --debug */
518
case ARGP_KEY_ARG:
292
plus_options = arg;
293
break;
519
294
case ARGP_KEY_END:
520
295
break;
521
296
default:
524
299
return 0;
525
300
}
526
301
527
struct argp argp = { .options = options,
528
.parser = parse_opt_config_file,
529
.args_doc = "",
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
530
306
.doc = "Mandos plugin runner -- Run plugins" };
531
307
532
/* Parse using the parse_opt_config_file in order to get the custom
533
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
535
309
if (ret == ARGP_ERR_UNKNOWN){
536
310
fprintf(stderr, "Unknown error while parsing arguments\n");
537
311
exitstatus = EXIT_FAILURE;
538
goto fallback;
312
goto end;
539
313
}
540
314
541
/* Reset to the normal argument parser */
542
argp.parser = parse_opt;
543
544
/* Open the configfile if available */
545
if (argfile == NULL){
546
conffp = fopen(AFILE, "r");
547
} else {
548
conffp = fopen(argfile, "r");
549
}
550
if(conffp != NULL){
551
char *org_line = NULL;
552
char *p, *arg, *new_arg, *line;
553
size_t size = 0;
554
ssize_t sret;
555
const char whitespace_delims[] = " \r\t\f\v\n";
556
const char comment_delim[] = "#";
557
558
custom_argc = 1;
559
custom_argv = malloc(sizeof(char*) * 2);
560
if(custom_argv == NULL){
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
561
325
perror("malloc");
562
326
exitstatus = EXIT_FAILURE;
563
goto fallback;
564
}
565
custom_argv[0] = argv[0];
566
custom_argv[1] = NULL;
567
568
/* for each line in the config file, strip whitespace and ignore
569
commented text */
570
while(true){
571
sret = getline(&org_line, &size, conffp);
572
if(sret == -1){
573
break;
574
}
575
576
line = org_line;
577
arg = strsep(&line, comment_delim);
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
579
if(p[0] == '\0'){
580
continue;
581
}
582
new_arg = strdup(p);
583
if(new_arg == NULL){
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
586
free(org_line);
587
goto fallback;
588
}
589
590
custom_argc += 1;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
596
free(org_line);
597
goto fallback;
598
}
599
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
601
}
602
}
603
free(org_line);
604
} else {
605
/* Check for harmful errors and go to fallback. Other errors might
606
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
perror("fopen");
609
exitstatus = EXIT_FAILURE;
610
goto fallback;
611
}
612
}
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
615
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
618
346
if (ret == ARGP_ERR_UNKNOWN){
619
347
fprintf(stderr, "Unknown error while parsing arguments\n");
620
348
exitstatus = EXIT_FAILURE;
621
goto fallback;
349
goto end;
622
350
}
623
351
}
624
352
625
/* Parse actual command line arguments, to let them override the
626
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
632
}
633
634
353
if(debug){
635
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
636
355
fprintf(stderr, "Plugin: %s has %d arguments\n",
638
357
for(char **a = p->argv; *a != NULL; a++){
639
358
fprintf(stderr, "\tArg: %s\n", *a);
640
359
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
642
for(char **a = p->environ; *a != NULL; a++){
643
fprintf(stderr, "\t%s\n", *a);
644
}
645
360
}
646
361
}
647
362
648
/* Strip permissions down to nobody */
649
363
ret = setuid(uid);
650
364
if (ret == -1){
651
365
perror("setuid");
652
}
366
}
367
653
368
setgid(gid);
654
369
if (ret == -1){
655
370
perror("setgid");
656
371
}
657
372
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
373
dir = opendir(plugindir);
664
374
if(dir == NULL){
665
375
perror("Could not open plugin dir");
666
376
exitstatus = EXIT_FAILURE;
667
goto fallback;
377
goto end;
668
378
}
669
379
670
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
675
385
if(ret < 0){
676
386
perror("set_cloexec_flag");
677
387
exitstatus = EXIT_FAILURE;
678
goto fallback;
388
goto end;
679
389
}
680
390
}
681
391
}
682
392
683
393
FD_ZERO(&rfds_all);
684
394
685
/* Read and execute any executable in the plugin directory*/
686
395
while(true){
687
396
dirst = readdir(dir);
688
397
689
/* All directory entries have been processed */
398
// All directory entries have been processed
690
399
if(dirst == NULL){
691
400
if (errno == EBADF){
692
401
perror("readdir");
693
402
exitstatus = EXIT_FAILURE;
694
goto fallback;
403
goto end;
695
404
}
696
405
break;
697
406
}
698
407
699
408
d_name_len = strlen(dirst->d_name);
700
409
701
/* Ignore dotfiles, backup files and other junk */
410
// Ignore dotfiles, backup files and other junk
702
411
{
703
412
bool bad_name = false;
704
413
719
428
break;
720
429
}
721
430
}
431
722
432
if(bad_name){
723
433
continue;
724
434
}
435
725
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
437
size_t suf_len = strlen(*suf);
727
438
if((d_name_len >= suf_len)
740
451
continue;
741
452
}
742
453
}
743
744
char *filename;
745
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
747
} else {
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
}
750
if(ret < 0){
751
perror("asprintf");
752
continue;
753
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
754
464
755
465
ret = stat(filename, &st);
756
466
if (ret == -1){
757
467
perror("stat");
758
free(filename);
759
continue;
468
exitstatus = EXIT_FAILURE;
469
goto end;
760
470
}
761
762
/* Ignore non-executable files */
471
763
472
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
764
473
if(debug){
765
474
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
768
477
free(filename);
769
478
continue;
770
479
}
771
772
plugin *p = getplugin(dirst->d_name);
773
if(p == NULL){
774
perror("getplugin");
775
free(filename);
776
continue;
777
}
778
if(p->disabled){
480
if(getplugin(dirst->d_name, &plugin_list)->disabled){
779
481
if(debug){
780
482
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
781
483
dirst->d_name);
783
485
free(filename);
784
486
continue;
785
487
}
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
786
489
{
787
490
/* Add global arguments to argument list for this plugin */
788
plugin *g = getplugin(NULL);
789
if(g != NULL){
790
for(char **a = g->argv + 1; *a != NULL; a++){
791
if(not add_argument(p, *a)){
792
perror("add_argument");
793
}
794
}
795
/* Add global environment variables */
796
for(char **e = g->environ; *e != NULL; e++){
797
if(not add_environment(p, *e, false)){
798
perror("add_environment");
799
}
800
}
801
}
802
}
803
/* If this plugin has any environment variables, we will call
804
using execve and need to duplicate the environment from this
805
process, too. */
806
if(p->environ[0] != NULL){
807
for(char **e = environ; *e != NULL; e++){
808
if(not add_environment(p, *e, false)){
809
perror("add_environment");
810
}
811
}
812
}
813
814
int pipefd[2];
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
493
addargument(p, *a);
494
}
495
}
496
int pipefd[2];
815
497
ret = pipe(pipefd);
816
498
if (ret == -1){
817
499
perror("pipe");
818
500
exitstatus = EXIT_FAILURE;
819
goto fallback;
501
goto end;
820
502
}
821
/* Ask OS to automatic close the pipe on exec */
822
503
ret = set_cloexec_flag(pipefd[0]);
823
504
if(ret < 0){
824
505
perror("set_cloexec_flag");
825
506
exitstatus = EXIT_FAILURE;
826
goto fallback;
507
goto end;
827
508
}
828
509
ret = set_cloexec_flag(pipefd[1]);
829
510
if(ret < 0){
830
511
perror("set_cloexec_flag");
831
512
exitstatus = EXIT_FAILURE;
832
goto fallback;
513
goto end;
833
514
}
834
515
/* Block SIGCHLD until process is safely in process list */
835
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
836
517
if(ret < 0){
837
518
perror("sigprocmask");
838
519
exitstatus = EXIT_FAILURE;
839
goto fallback;
520
goto end;
840
521
}
841
/* Starting a new process to be watched */
522
// Starting a new process to be watched
842
523
pid_t pid = fork();
843
if(pid == -1){
844
perror("fork");
845
exitstatus = EXIT_FAILURE;
846
goto fallback;
847
}
848
524
if(pid == 0){
849
525
/* this is the child process */
850
526
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
869
545
above and must now close it manually here. */
870
546
closedir(dir);
871
547
}
872
if(p->environ[0] == NULL){
873
if(execv(filename, p->argv) < 0){
874
perror("execv");
875
_exit(EXIT_FAILURE);
876
}
877
} else {
878
if(execve(filename, p->argv, p->environ) < 0){
879
perror("execve");
880
_exit(EXIT_FAILURE);
881
}
548
if(execv(filename, p->argv) < 0){
549
perror("execv");
550
_exit(EXIT_FAILURE);
882
551
}
883
552
/* no return */
884
553
}
885
/* Parent process */
886
close(pipefd[1]); /* Close unused write end of pipe */
554
/* parent process */
887
555
free(filename);
888
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
890
perror("getplugin");
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
559
perror("malloc");
891
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
892
561
if(ret < 0){
893
perror("sigprocmask");
562
perror("sigprocmask");
894
563
}
895
564
exitstatus = EXIT_FAILURE;
896
goto fallback;
565
goto end;
897
566
}
898
567
899
new_plugin->pid = pid;
900
new_plugin->fd = pipefd[0];
901
568
*new_process = (struct process){ .pid = pid,
569
.fd = pipefd[0],
570
.next = process_list };
571
// List handling
572
process_list = new_process;
902
573
/* Unblock SIGCHLD so signal handler can be run if this process
903
574
has already completed */
904
575
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
576
if(ret < 0){
906
577
perror("sigprocmask");
907
578
exitstatus = EXIT_FAILURE;
908
goto fallback;
909
}
910
911
FD_SET(new_plugin->fd, &rfds_all);
912
913
if (maxfd < new_plugin->fd){
914
maxfd = new_plugin->fd;
915
}
916
579
goto end;
580
}
581
582
FD_SET(new_process->fd, &rfds_all);
583
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
586
}
587
588
}
589
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
594
free(plugin_list);
917
595
}
918
596
919
597
closedir(dir);
920
598
dir = NULL;
921
922
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
if(p->pid != 0){
924
break;
925
}
926
if(p->next == NULL){
927
fprintf(stderr, "No plugin processes started. Incorrect plugin"
928
" directory?\n");
929
free_plugin_list();
930
}
599
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
602
" directory?\n");
603
process_list = NULL;
931
604
}
932
933
/* Main loop while running plugins exist */
934
while(plugin_list){
605
while(process_list){
935
606
fd_set rfds = rfds_all;
936
607
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
608
if (select_ret == -1){
938
609
perror("select");
939
610
exitstatus = EXIT_FAILURE;
940
goto fallback;
611
goto end;
941
612
}
942
613
/* OK, now either a process completed, or something can be read
943
614
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
615
for(process *proc = process_list; proc ; proc = proc->next){
945
616
/* Is this process completely done? */
946
617
if(proc->eof and proc->completed){
947
618
/* Only accept the plugin output if it exited cleanly */
948
619
if(not WIFEXITED(proc->status)
949
620
or WEXITSTATUS(proc->status) != 0){
950
621
/* Bad exit by plugin */
951
952
622
if(debug){
953
623
if(WIFEXITED(proc->status)){
954
624
fprintf(stderr, "Plugin %u exited with status %d\n",
963
633
(unsigned int) (proc->pid));
964
634
}
965
635
}
966
967
636
/* Remove the plugin */
968
637
FD_CLR(proc->fd, &rfds_all);
969
970
638
/* Block signal while modifying process_list */
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
639
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
972
640
if(ret < 0){
973
641
perror("sigprocmask");
974
642
exitstatus = EXIT_FAILURE;
975
goto fallback;
976
}
977
free_plugin(proc);
643
goto end;
644
}
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
649
} else {
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
652
if(p->next == proc){
653
p->next = proc->next;
654
break;
655
}
656
}
657
}
978
658
/* We are done modifying process list, so unblock signal */
979
659
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
660
NULL);
981
661
if(ret < 0){
982
662
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
984
goto fallback;
985
}
986
987
if(plugin_list == NULL){
988
break;
989
}
990
continue;
663
}
664
free(proc->buffer);
665
free(proc);
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
668
the process list */
669
break;
991
670
}
992
993
671
/* This process exited nicely, so print its buffer */
994
672
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
674
if(not bret){
998
675
perror("print_out_password");
999
676
exitstatus = EXIT_FAILURE;
1000
677
}
1001
goto fallback;
678
goto end;
1002
679
}
1003
1004
680
/* This process has not completed. Does it have any output? */
1005
681
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
682
/* This process had nothing to say at this time */
1013
689
if (proc->buffer == NULL){
1014
690
perror("malloc");
1015
691
exitstatus = EXIT_FAILURE;
1016
goto fallback;
692
goto end;
1017
693
}
1018
694
proc->buffer_size += BUFFER_SIZE;
1019
695
}
1034
710
}
1035
711
1036
712
1037
fallback:
713
end:
1038
714
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
715
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
716
/* Fallback if all plugins failed or an error occured */
1042
717
bool bret;
1043
718
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
719
char *passwordbuffer = getpass("Password: ");
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
720
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
721
if(not bret){
1053
722
perror("print_out_password");
1054
723
exitstatus = EXIT_FAILURE;
724
goto end;
1055
725
}
1056
726
}
1057
727
1058
728
/* Restore old signal handler */
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1063
}
1064
1065
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
free(*arg);
1068
}
1069
free(custom_argv);
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
730
731
free(plus_argv);
732
733
/* Free the plugin list */
734
for(plugin *next; plugin_list != NULL; plugin_list = next){
735
next = plugin_list->next;
736
free(plugin_list->argv);
737
free(plugin_list);
1070
738
}
1071
739
1072
740
if(dir != NULL){
1074
742
}
1075
743
1076
744
/* Free the process list and kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
745
for(process *next; process_list != NULL; process_list = next){
746
next = process_list->next;
747
close(process_list->fd);
748
ret = kill(process_list->pid, SIGTERM);
749
if(ret == -1 and errno != ESRCH){
750
/* set-uid proccesses migth not get closed */
751
perror("kill");
1085
752
}
753
free(process_list->buffer);
754
free(process_list);
1086
755
}
1087
756
1088
757
/* Wait for any remaining child processes to terminate */
1092
761
if(errno != ECHILD){
1093
762
perror("wait");
1094
763
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
764
1101
765
return exitstatus;
1102
766
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0