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- Committer: Teddy Hogeborn
- Date: 2008-08-14 02:24:59 UTC
- Revision ID: teddy@fukt.bsnet.se-20080814022459-rq3jt4q409l3qbj3
* Makefile (PREFIX, CONFDIR): New.
* initramfs-tools-hook: Search for Mandos in /usr/local as well as in
/usr. Also copy plugin-runner. Also chmod
the config dir.
(DESTCONFDIR): Removed.
(MANDOSDIR): New.
(PLUGINDIR): Changed to "${MANDOSDIR}/plugins.d".
* initramfs-tools-script: New.
* mandos-client.c: Renamed to "plugin-runner.c". All references
changed.
(plugindir): Changed to "/lib/mandos/plugins.d".
* plugins.d/usplash: New.
* initramfs-tools-hook: Search for Mandos in /usr/local as well as in
/usr. Also copy plugin-runner. Also chmod
the config dir.
(DESTCONFDIR): Removed.
(MANDOSDIR): New.
(PLUGINDIR): Changed to "${MANDOSDIR}/plugins.d".
* initramfs-tools-script: New.
* mandos-client.c: Renamed to "plugin-runner.c". All references
changed.
(plugindir): Changed to "/lib/mandos/plugins.d".
* plugins.d/usplash: New.
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files renamed:
- 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
plugin-runner.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
69
const char *argp_program_version = "plugin-runner 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 = "/lib/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
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
400
break;
401
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
421
}
422
break;
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
{
428
char *envdef = strchr(arg, ':');
429
if(envdef == NULL){
430
break;
431
}
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
435
}
436
}
437
break;
438
case 'd': /* --disable */
439
if (arg != NULL){
440
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
443
}
444
p->disabled = true;
445
}
446
break;
447
case 'e': /* --enable */
448
if (arg != NULL){
449
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
452
}
453
p->disabled = false;
454
}
455
break;
456
case 128: /* --plugin-dir */
457
free(plugindir);
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
462
break;
463
case 129: /* --config-file */
464
/* This is already done by parse_opt_config_file() */
465
break;
466
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:
467
280
uid = (uid_t)strtol(arg, NULL, 10);
468
281
break;
469
case 131: /* --groupid */
282
case 130:
470
283
gid = (gid_t)strtol(arg, NULL, 10);
471
284
break;
472
case 132: /* --debug */
285
case 131:
473
286
debug = true;
474
287
break;
475
288
case ARGP_KEY_ARG:
476
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
477
break;
478
case ARGP_KEY_END:
479
break;
480
default:
481
return ARGP_ERR_UNKNOWN;
482
}
483
return 0;
484
}
485
486
/* This option parser is the same as parse_opt() above, except it
487
ignores everything but the --config-file option. */
488
error_t parse_opt_config_file (int key, char *arg,
489
__attribute__((unused))
490
struct argp_state *state) {
491
switch (key) {
492
case 'g': /* --global-options */
493
case 'G': /* --global-env */
494
case 'o': /* --options-for */
495
case 'E': /* --env-for */
496
case 'd': /* --disable */
497
case 'e': /* --enable */
498
case 128: /* --plugin-dir */
499
break;
500
case 129: /* --config-file */
501
free(argfile);
502
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
505
291
}
506
break;
507
case 130: /* --userid */
508
case 131: /* --groupid */
509
case 132: /* --debug */
510
case ARGP_KEY_ARG:
292
plus_options = arg;
293
break;
511
294
case ARGP_KEY_END:
512
295
break;
513
296
default:
516
299
return 0;
517
300
}
518
301
519
struct argp argp = { .options = options,
520
.parser = parse_opt_config_file,
521
.args_doc = "",
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
522
306
.doc = "Mandos plugin runner -- Run plugins" };
523
307
524
/* Parse using the parse_opt_config_file in order to get the custom
525
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
527
309
if (ret == ARGP_ERR_UNKNOWN){
528
310
fprintf(stderr, "Unknown error while parsing arguments\n");
529
311
exitstatus = EXIT_FAILURE;
530
goto fallback;
312
goto end;
531
313
}
532
314
533
/* Reset to the normal argument parser */
534
argp.parser = parse_opt;
535
536
/* Open the configfile if available */
537
if (argfile == NULL){
538
conffp = fopen(AFILE, "r");
539
} else {
540
conffp = fopen(argfile, "r");
541
}
542
if(conffp != NULL){
543
char *org_line = NULL;
544
char *p, *arg, *new_arg, *line;
545
size_t size = 0;
546
ssize_t sret;
547
const char whitespace_delims[] = " \r\t\f\v\n";
548
const char comment_delim[] = "#";
549
550
custom_argc = 1;
551
custom_argv = malloc(sizeof(char*) * 2);
552
if(custom_argv == NULL){
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){
553
325
perror("malloc");
554
326
exitstatus = EXIT_FAILURE;
555
goto fallback;
556
}
557
custom_argv[0] = argv[0];
558
custom_argv[1] = NULL;
559
560
/* for each line in the config file, strip whitespace and ignore
561
commented text */
562
while(true){
563
sret = getline(&org_line, &size, conffp);
564
if(sret == -1){
565
break;
566
}
567
568
line = org_line;
569
arg = strsep(&line, comment_delim);
570
while((p = strsep(&arg, whitespace_delims)) != NULL){
571
if(p[0] == '\0'){
572
continue;
573
}
574
new_arg = strdup(p);
575
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
578
free(org_line);
579
goto fallback;
580
}
581
582
custom_argc += 1;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
590
}
591
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
593
}
594
}
595
free(org_line);
596
} else {
597
/* Check for harmful errors and go to fallback. Other errors might
598
not affect opening plugins */
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
}
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
607
if(custom_argv != NULL){
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
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);
610
346
if (ret == ARGP_ERR_UNKNOWN){
611
347
fprintf(stderr, "Unknown error while parsing arguments\n");
612
348
exitstatus = EXIT_FAILURE;
613
goto fallback;
349
goto end;
614
350
}
615
351
}
616
352
617
/* Parse actual command line arguments, to let them override the
618
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
623
goto fallback;
624
}
625
626
353
if(debug){
627
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
628
355
fprintf(stderr, "Plugin: %s has %d arguments\n",
630
357
for(char **a = p->argv; *a != NULL; a++){
631
358
fprintf(stderr, "\tArg: %s\n", *a);
632
359
}
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
634
for(char **a = p->environ; *a != NULL; a++){
635
fprintf(stderr, "\t%s\n", *a);
636
}
637
360
}
638
361
}
639
362
640
/* Strip permissions down to nobody */
641
363
ret = setuid(uid);
642
364
if (ret == -1){
643
365
perror("setuid");
644
}
366
}
367
645
368
setgid(gid);
646
369
if (ret == -1){
647
370
perror("setgid");
648
371
}
649
372
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
373
dir = opendir(plugindir);
656
374
if(dir == NULL){
657
375
perror("Could not open plugin dir");
658
376
exitstatus = EXIT_FAILURE;
659
goto fallback;
377
goto end;
660
378
}
661
379
662
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
667
385
if(ret < 0){
668
386
perror("set_cloexec_flag");
669
387
exitstatus = EXIT_FAILURE;
670
goto fallback;
388
goto end;
671
389
}
672
390
}
673
391
}
674
392
675
393
FD_ZERO(&rfds_all);
676
394
677
/* Read and execute any executable in the plugin directory*/
678
395
while(true){
679
396
dirst = readdir(dir);
680
397
681
/* All directory entries have been processed */
398
// All directory entries have been processed
682
399
if(dirst == NULL){
683
400
if (errno == EBADF){
684
401
perror("readdir");
685
402
exitstatus = EXIT_FAILURE;
686
goto fallback;
403
goto end;
687
404
}
688
405
break;
689
406
}
690
407
691
408
d_name_len = strlen(dirst->d_name);
692
409
693
/* Ignore dotfiles, backup files and other junk */
410
// Ignore dotfiles, backup files and other junk
694
411
{
695
412
bool bad_name = false;
696
413
711
428
break;
712
429
}
713
430
}
431
714
432
if(bad_name){
715
433
continue;
716
434
}
435
717
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
437
size_t suf_len = strlen(*suf);
719
438
if((d_name_len >= suf_len)
732
451
continue;
733
452
}
734
453
}
735
736
char *filename;
737
if(plugindir == NULL){
738
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
739
} else {
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
}
742
if(ret < 0){
743
perror("asprintf");
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
744
458
continue;
745
459
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
746
463
747
464
ret = stat(filename, &st);
748
465
if (ret == -1){
750
467
free(filename);
751
468
continue;
752
469
}
753
754
/* Ignore non-executable files */
470
755
471
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
756
472
if(debug){
757
473
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
760
476
free(filename);
761
477
continue;
762
478
}
763
764
plugin *p = getplugin(dirst->d_name);
765
if(p == NULL){
766
perror("getplugin");
767
free(filename);
768
continue;
769
}
770
if(p->disabled){
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
771
480
if(debug){
772
481
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
773
482
dirst->d_name);
775
484
free(filename);
776
485
continue;
777
486
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
778
488
{
779
489
/* Add global arguments to argument list for this plugin */
780
plugin *g = getplugin(NULL);
781
if(g != NULL){
782
for(char **a = g->argv + 1; *a != NULL; a++){
783
if(not add_argument(p, *a)){
784
perror("add_argument");
785
}
786
}
787
/* Add global environment variables */
788
for(char **e = g->environ; *e != NULL; e++){
789
if(not add_environment(p, *e, false)){
790
perror("add_environment");
791
}
792
}
793
}
794
}
795
/* If this plugin has any environment variables, we will call
796
using execve and need to duplicate the environment from this
797
process, too. */
798
if(p->environ[0] != NULL){
799
for(char **e = environ; *e != NULL; e++){
800
if(not add_environment(p, *e, false)){
801
perror("add_environment");
802
}
803
}
804
}
805
806
int pipefd[2];
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
807
496
ret = pipe(pipefd);
808
497
if (ret == -1){
809
498
perror("pipe");
810
499
exitstatus = EXIT_FAILURE;
811
goto fallback;
500
goto end;
812
501
}
813
/* Ask OS to automatic close the pipe on exec */
814
502
ret = set_cloexec_flag(pipefd[0]);
815
503
if(ret < 0){
816
504
perror("set_cloexec_flag");
817
505
exitstatus = EXIT_FAILURE;
818
goto fallback;
506
goto end;
819
507
}
820
508
ret = set_cloexec_flag(pipefd[1]);
821
509
if(ret < 0){
822
510
perror("set_cloexec_flag");
823
511
exitstatus = EXIT_FAILURE;
824
goto fallback;
512
goto end;
825
513
}
826
514
/* Block SIGCHLD until process is safely in process list */
827
515
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
828
516
if(ret < 0){
829
517
perror("sigprocmask");
830
518
exitstatus = EXIT_FAILURE;
831
goto fallback;
519
goto end;
832
520
}
833
/* Starting a new process to be watched */
521
// Starting a new process to be watched
834
522
pid_t pid = fork();
835
523
if(pid == -1){
836
524
perror("fork");
837
525
exitstatus = EXIT_FAILURE;
838
goto fallback;
526
goto end;
839
527
}
840
528
if(pid == 0){
841
529
/* this is the child process */
861
549
above and must now close it manually here. */
862
550
closedir(dir);
863
551
}
864
if(p->environ[0] == NULL){
865
if(execv(filename, p->argv) < 0){
866
perror("execv");
867
_exit(EXIT_FAILURE);
868
}
869
} else {
870
if(execve(filename, p->argv, p->environ) < 0){
871
perror("execve");
872
_exit(EXIT_FAILURE);
873
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
874
555
}
875
556
/* no return */
876
557
}
877
/* Parent process */
878
close(pipefd[1]); /* Close unused write end of pipe */
558
/* parent process */
879
559
free(filename);
880
plugin *new_plugin = getplugin(dirst->d_name);
881
if (new_plugin == NULL){
882
perror("getplugin");
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
883
564
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
884
565
if(ret < 0){
885
perror("sigprocmask");
566
perror("sigprocmask");
886
567
}
887
568
exitstatus = EXIT_FAILURE;
888
goto fallback;
569
goto end;
889
570
}
890
571
891
new_plugin->pid = pid;
892
new_plugin->fd = pipefd[0];
893
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
894
577
/* Unblock SIGCHLD so signal handler can be run if this process
895
578
has already completed */
896
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
897
580
if(ret < 0){
898
581
perror("sigprocmask");
899
582
exitstatus = EXIT_FAILURE;
900
goto fallback;
901
}
902
903
FD_SET(new_plugin->fd, &rfds_all);
904
905
if (maxfd < new_plugin->fd){
906
maxfd = new_plugin->fd;
907
}
908
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
909
599
}
910
600
911
601
closedir(dir);
912
602
dir = NULL;
913
914
for(plugin *p = plugin_list; p != NULL; p = p->next){
915
if(p->pid != 0){
916
break;
917
}
918
if(p->next == NULL){
919
fprintf(stderr, "No plugin processes started. Incorrect plugin"
920
" directory?\n");
921
free_plugin_list();
922
}
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
923
608
}
924
925
/* Main loop while running plugins exist */
926
while(plugin_list){
609
while(process_list){
927
610
fd_set rfds = rfds_all;
928
611
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
929
612
if (select_ret == -1){
930
613
perror("select");
931
614
exitstatus = EXIT_FAILURE;
932
goto fallback;
615
goto end;
933
616
}
934
617
/* OK, now either a process completed, or something can be read
935
618
from one of them */
936
for(plugin *proc = plugin_list; proc != NULL;){
619
for(process *proc = process_list; proc ; proc = proc->next){
937
620
/* Is this process completely done? */
938
621
if(proc->eof and proc->completed){
939
622
/* Only accept the plugin output if it exited cleanly */
940
623
if(not WIFEXITED(proc->status)
941
624
or WEXITSTATUS(proc->status) != 0){
942
625
/* Bad exit by plugin */
943
944
626
if(debug){
945
627
if(WIFEXITED(proc->status)){
946
628
fprintf(stderr, "Plugin %u exited with status %d\n",
955
637
(unsigned int) (proc->pid));
956
638
}
957
639
}
958
959
640
/* Remove the plugin */
960
641
FD_CLR(proc->fd, &rfds_all);
961
962
642
/* Block signal while modifying process_list */
963
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
644
if(ret < 0){
965
645
perror("sigprocmask");
966
646
exitstatus = EXIT_FAILURE;
967
goto fallback;
968
}
969
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
970
662
/* We are done modifying process list, so unblock signal */
971
663
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
972
664
NULL);
973
665
if(ret < 0){
974
666
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
976
goto fallback;
977
}
978
979
if(plugin_list == NULL){
980
break;
981
}
982
983
plugin *next_plugin = proc->next;
984
free_plugin(proc);
985
proc = next_plugin;
986
continue;
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
987
674
}
988
989
675
/* This process exited nicely, so print its buffer */
990
676
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
993
678
if(not bret){
994
679
perror("print_out_password");
995
680
exitstatus = EXIT_FAILURE;
996
681
}
997
goto fallback;
682
goto end;
998
683
}
999
1000
684
/* This process has not completed. Does it have any output? */
1001
685
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1002
686
/* This process had nothing to say at this time */
1003
proc = proc->next;
1004
687
continue;
1005
688
}
1006
689
/* Before reading, make the process' data buffer large enough */
1010
693
if (proc->buffer == NULL){
1011
694
perror("malloc");
1012
695
exitstatus = EXIT_FAILURE;
1013
goto fallback;
696
goto end;
1014
697
}
1015
698
proc->buffer_size += BUFFER_SIZE;
1016
699
}
1019
702
BUFFER_SIZE);
1020
703
if(ret < 0){
1021
704
/* Read error from this process; ignore the error */
1022
proc = proc->next;
1023
705
continue;
1024
706
}
1025
707
if(ret == 0){
1032
714
}
1033
715
1034
716
1035
fallback:
717
end:
1036
718
1037
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1038
/* Fallback if all plugins failed, none are found or an error
1039
occured */
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
1040
721
bool bret;
1041
722
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1042
723
char *passwordbuffer = getpass("Password: ");
1043
size_t len = strlen(passwordbuffer);
1044
/* Strip trailing newline */
1045
if(len > 0 and passwordbuffer[len-1] == '\n'){
1046
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1047
len--;
1048
}
1049
bret = print_out_password(passwordbuffer, len);
724
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1050
725
if(not bret){
1051
726
perror("print_out_password");
1052
727
exitstatus = EXIT_FAILURE;
728
goto end;
1053
729
}
1054
730
}
1055
731
1056
732
/* Restore old signal handler */
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1058
if(ret == -1){
1059
perror("sigaction");
1060
exitstatus = EXIT_FAILURE;
1061
}
1062
1063
if(custom_argv != NULL){
1064
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1065
free(*arg);
1066
}
1067
free(custom_argv);
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
1068
742
}
1069
743
1070
744
if(dir != NULL){
1072
746
}
1073
747
1074
748
/* Free the process list and kill the processes */
1075
for(plugin *p = plugin_list; p != NULL; p = p->next){
1076
if(p->pid != 0){
1077
close(p->fd);
1078
ret = kill(p->pid, SIGTERM);
1079
if(ret == -1 and errno != ESRCH){
1080
/* Set-uid proccesses might not get closed */
1081
perror("kill");
1082
}
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1083
756
}
757
free(process_list->buffer);
758
free(process_list);
1084
759
}
1085
760
1086
761
/* Wait for any remaining child processes to terminate */
1090
765
if(errno != ECHILD){
1091
766
perror("wait");
1092
767
}
1093
1094
free_plugin_list();
1095
1096
free(plugindir);
1097
free(argfile);
1098
768
1099
769
return exitstatus;
1100
770
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0