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- Committer: Teddy Hogeborn
- Date: 2008-08-25 06:44:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20080825064413-smqg5qwxfvhkeop4
* Makefile (DOCBOOKTOMAN): Only cd to one directory.
* mandos-options.xml (interface): Removed mention of a specific
replaceable.
(debug): Reworded slightly.
* mandos.conf.xml (OPTIONS): Renamed some replaceable names.
* mandos.xml (SYNOPSIS, OPTIONS): Renamed replaceable of "interface"
from "IF" to "NAME".
* mandos-options.xml (interface): Removed mention of a specific
replaceable.
(debug): Reworded slightly.
* mandos.conf.xml (OPTIONS): Renamed some replaceable names.
* mandos.xml (SYNOPSIS, OPTIONS): Renamed replaceable of "interface"
from "IF" to "NAME".
- files added:
- COPYING
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
52
72
53
73
struct process;
54
74
59
79
size_t buffer_size;
60
80
size_t buffer_length;
61
81
bool eof;
62
bool completed;
63
int status;
82
volatile bool completed;
83
volatile int status;
64
84
struct process *next;
65
85
} process;
66
86
68
88
char *name; /* can be NULL or any plugin name */
69
89
char **argv;
70
90
int argc;
91
char **environ;
92
int envc;
71
93
bool disabled;
72
94
struct plugin *next;
73
95
} plugin;
74
96
75
plugin *getplugin(char *name, plugin **plugin_list){
97
static plugin *getplugin(char *name, plugin **plugin_list){
76
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
77
99
if ((p->name == name)
78
100
or (p->name and name and (strcmp(p->name, name) == 0))){
82
104
/* Create a new plugin */
83
105
plugin *new_plugin = malloc(sizeof(plugin));
84
106
if (new_plugin == NULL){
85
perror("malloc");
86
exit(EXIT_FAILURE);
87
}
88
new_plugin->name = name;
107
return NULL;
108
}
109
char *copy_name = NULL;
110
if(name != NULL){
111
copy_name = strdup(name);
112
if(copy_name == NULL){
113
return NULL;
114
}
115
}
116
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
122
89
123
new_plugin->argv = malloc(sizeof(char *) * 2);
90
124
if (new_plugin->argv == NULL){
91
perror("malloc");
92
exit(EXIT_FAILURE);
125
free(copy_name);
126
free(new_plugin);
127
return NULL;
93
128
}
94
new_plugin->argv[0] = name;
129
new_plugin->argv[0] = copy_name;
95
130
new_plugin->argv[1] = NULL;
96
new_plugin->argc = 1;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
131
132
new_plugin->environ = malloc(sizeof(char *));
133
if(new_plugin->environ == NULL){
134
free(copy_name);
135
free(new_plugin->argv);
136
free(new_plugin);
137
return NULL;
138
}
139
new_plugin->environ[0] = NULL;
99
140
/* Append the new plugin to the list */
100
141
*plugin_list = new_plugin;
101
142
return new_plugin;
102
143
}
103
144
104
void addargument(plugin *p, char *arg){
105
p->argv[p->argc] = arg;
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
107
if (p->argv == NULL){
108
perror("malloc");
109
exit(EXIT_FAILURE);
110
}
111
p->argc++;
112
p->argv[p->argc] = NULL;
113
}
145
/* Helper function for add_argument and add_environment */
146
static bool add_to_char_array(const char *new, char ***array,
147
int *len){
148
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
151
/* Malloc check */
152
if(*array == NULL){
153
return false;
154
}
155
/* Make a copy of the new string */
156
char *copy = strdup(new);
157
if(copy == NULL){
158
return false;
159
}
160
/* Insert the copy */
161
(*array)[*len] = copy;
162
(*len)++;
163
/* Add a new terminating NULL pointer to the last element */
164
(*array)[*len] = NULL;
165
return true;
166
}
167
168
/* Add to a plugin's argument vector */
169
static bool add_argument(plugin *p, const char *arg){
170
if(p == NULL){
171
return false;
172
}
173
return add_to_char_array(arg, &(p->argv), &(p->argc));
174
}
175
176
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
178
if(p == NULL){
179
return false;
180
}
181
return add_to_char_array(def, &(p->environ), &(p->envc));
182
}
183
114
184
115
185
/*
116
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
117
187
* Descriptor Flags".
118
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
119
189
*/
120
int set_cloexec_flag(int fd)
190
static int set_cloexec_flag(int fd)
121
191
{
122
192
int ret = fcntl(fd, F_GETFD, 0);
123
193
/* If reading the flags failed, return error indication now. */
128
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
129
199
}
130
200
131
#define BUFFER_SIZE 256
132
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
201
process *process_list = NULL;
137
202
138
/* Mark a process as completed when it exits, and save its exit
203
/* Mark processes as completed when they exit, and save their exit
139
204
status. */
140
205
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
206
while(true){
207
process *proc = process_list;
208
int status;
209
pid_t pid = waitpid(-1, &status, WNOHANG);
210
if(pid == 0){
211
/* Only still running child processes */
212
break;
213
}
214
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
217
}
218
/* No child processes */
219
break;
220
}
221
222
/* A child exited, find it in process_list */
223
while(proc != NULL and proc->pid != pid){
224
proc = proc->next;
225
}
226
if(proc == NULL){
227
/* Process not found in process list */
228
continue;
229
}
230
proc->status = status;
231
proc->completed = true;
232
}
233
}
234
235
bool print_out_password(const char *buffer, size_t length){
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
for(size_t written = 0; written < length; written += (size_t)ret){
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
length - written));
243
if(ret < 0){
244
return false;
245
}
246
}
247
return true;
248
}
249
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
256
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
270
}
271
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
284
}
153
285
}
154
286
155
287
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
290
FILE *conffp;
157
291
size_t d_name_len;
158
292
DIR *dir = NULL;
159
293
struct dirent *dirst;
160
294
struct stat st;
161
295
fd_set rfds_all;
162
296
int ret, maxfd = 0;
297
uid_t uid = 65534;
298
gid_t gid = 65534;
163
299
bool debug = false;
164
300
int exitstatus = EXIT_SUCCESS;
301
struct sigaction old_sigchld_action;
302
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
303
.sa_flags = SA_NOCLDSTOP };
304
char **custom_argv = NULL;
305
int custom_argc = 0;
165
306
166
307
/* Establish a signal handler */
167
struct sigaction old_sigchld_action,
168
sigchld_action = { .sa_handler = handle_sigchld,
169
.sa_flags = SA_NOCLDSTOP };
170
308
sigemptyset(&sigchld_action.sa_mask);
171
309
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
172
if(ret < 0){
310
if(ret == -1){
173
311
perror("sigaddset");
174
exit(EXIT_FAILURE);
312
exitstatus = EXIT_FAILURE;
313
goto fallback;
175
314
}
176
315
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
177
if(ret < 0){
316
if(ret == -1){
178
317
perror("sigaction");
179
exit(EXIT_FAILURE);
318
exitstatus = EXIT_FAILURE;
319
goto fallback;
180
320
}
181
321
182
322
/* The options we understand. */
184
324
{ .name = "global-options", .key = 'g',
185
325
.arg = "OPTION[,OPTION[,...]]",
186
326
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
328
.arg = "VAR=value",
329
.doc = "Environment variable passed to all plugins" },
187
330
{ .name = "options-for", .key = 'o',
188
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
189
332
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
334
.arg = "PLUGIN:ENV=value",
335
.doc = "Environment variable passed to specified plugin" },
190
336
{ .name = "disable", .key = 'd',
191
337
.arg = "PLUGIN",
192
338
.doc = "Disable a specific plugin", .group = 1 },
193
339
{ .name = "plugin-dir", .key = 128,
194
340
.arg = "DIRECTORY",
195
341
.doc = "Specify a different plugin directory", .group = 2 },
196
{ .name = "debug", .key = 129,
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
197
349
.doc = "Debug mode", .group = 3 },
198
350
{ .name = NULL }
199
351
};
205
357
switch (key) {
206
358
case 'g':
207
359
if (arg != NULL){
208
char *p = strtok(arg, ",");
209
do{
210
addargument(getplugin(NULL, plugins), p);
211
p = strtok(NULL, ",");
212
} while (p);
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
363
continue;
364
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
366
perror("add_argument");
367
return ARGP_ERR_UNKNOWN;
368
}
369
}
370
}
371
break;
372
case 'e':
373
if(arg == NULL){
374
break;
375
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
213
384
}
214
385
break;
215
386
case 'o':
216
387
if (arg != NULL){
217
char *name = strtok(arg, ":");
218
char *p = strtok(NULL, ":");
219
if(p){
220
p = strtok(p, ",");
221
do{
222
addargument(getplugin(name, plugins), p);
223
p = strtok(NULL, ",");
224
} while (p);
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
406
}
407
}
408
}
409
break;
410
case 'f':
411
if(arg == NULL){
412
break;
413
}
414
{
415
char *envdef = strchr(arg, ':');
416
if(envdef == NULL){
417
break;
418
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
423
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
425
perror("add_environment");
225
426
}
226
427
}
227
428
break;
228
429
case 'd':
229
430
if (arg != NULL){
230
getplugin(arg, plugins)->disabled = true;
431
plugin *p = getplugin(arg, plugins);
432
if(p == NULL){
433
return ARGP_ERR_UNKNOWN;
434
}
435
p->disabled = true;
231
436
}
232
437
break;
233
438
case 128:
234
439
plugindir = arg;
235
440
break;
236
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
237
448
debug = true;
238
449
break;
239
450
case ARGP_KEY_ARG:
240
argp_usage (state);
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
241
452
break;
242
453
case ARGP_KEY_END:
243
454
break;
250
461
plugin *plugin_list = NULL;
251
462
252
463
struct argp argp = { .options = options, .parser = parse_opt,
253
.args_doc = "",
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
254
465
.doc = "Mandos plugin runner -- Run plugins" };
255
466
256
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
469
fprintf(stderr, "Unknown error while parsing arguments\n");
470
exitstatus = EXIT_FAILURE;
471
goto fallback;
472
}
473
474
conffp = fopen(argfile, "r");
475
if(conffp != NULL){
476
char *org_line = NULL;
477
char *p, *arg, *new_arg, *line;
478
size_t size = 0;
479
ssize_t sret;
480
const char whitespace_delims[] = " \r\t\f\v\n";
481
const char comment_delim[] = "#";
482
483
while(true){
484
sret = getline(&org_line, &size, conffp);
485
if(sret == -1){
486
break;
487
}
488
489
line = org_line;
490
arg = strsep(&line, comment_delim);
491
while((p = strsep(&arg, whitespace_delims)) != NULL){
492
if(p[0] == '\0'){
493
continue;
494
}
495
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
500
goto fallback;
501
}
502
}
503
}
504
free(org_line);
505
} else{
506
/* Check for harmful errors and go to fallback. Other errors might
507
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
perror("fopen");
510
exitstatus = EXIT_FAILURE;
511
goto fallback;
512
}
513
}
514
515
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
520
fprintf(stderr, "Unknown error while parsing arguments\n");
521
exitstatus = EXIT_FAILURE;
522
goto fallback;
523
}
524
}
257
525
258
526
if(debug){
259
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
262
530
for(char **a = p->argv; *a != NULL; a++){
263
531
fprintf(stderr, "\tArg: %s\n", *a);
264
532
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
534
for(char **a = p->environ; *a != NULL; a++){
535
fprintf(stderr, "\t%s\n", *a);
536
}
265
537
}
266
538
}
267
539
540
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
548
}
549
268
550
dir = opendir(plugindir);
269
551
if(dir == NULL){
270
552
perror("Could not open plugin dir");
271
553
exitstatus = EXIT_FAILURE;
272
goto end;
554
goto fallback;
273
555
}
274
556
275
557
/* Set the FD_CLOEXEC flag on the directory, if possible */
280
562
if(ret < 0){
281
563
perror("set_cloexec_flag");
282
564
exitstatus = EXIT_FAILURE;
283
goto end;
565
goto fallback;
284
566
}
285
567
}
286
568
}
292
574
293
575
// All directory entries have been processed
294
576
if(dirst == NULL){
577
if (errno == EBADF){
578
perror("readdir");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
295
582
break;
296
583
}
297
584
341
628
continue;
342
629
}
343
630
}
344
345
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
346
if (filename == NULL){
347
perror("malloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
strcpy(filename, plugindir); /* Spurious warning */
352
strcat(filename, "/"); /* Spurious warning */
353
strcat(filename, dirst->d_name); /* Spurious warning */
354
355
stat(filename, &st);
631
632
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
634
if(ret < 0){
635
perror("asprintf");
636
continue;
637
}
638
639
ret = stat(filename, &st);
640
if (ret == -1){
641
perror("stat");
642
free(filename);
643
continue;
644
}
356
645
357
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
358
647
if(debug){
362
651
free(filename);
363
652
continue;
364
653
}
365
if(getplugin(dirst->d_name, &plugin_list)->disabled){
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
655
if(p == NULL){
656
perror("getplugin");
657
free(filename);
658
continue;
659
}
660
if(p->disabled){
366
661
if(debug){
367
662
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
368
663
dirst->d_name);
370
665
free(filename);
371
666
continue;
372
667
}
373
plugin *p = getplugin(dirst->d_name, &plugin_list);
374
668
{
375
669
/* Add global arguments to argument list for this plugin */
376
670
plugin *g = getplugin(NULL, &plugin_list);
377
for(char **a = g->argv + 1; *a != NULL; a++){
378
addargument(p, *a);
379
}
380
}
381
int pipefd[2];
671
if(g != NULL){
672
for(char **a = g->argv + 1; *a != NULL; a++){
673
if(not add_argument(p, *a)){
674
perror("add_argument");
675
}
676
}
677
/* Add global environment variables */
678
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
680
perror("add_environment");
681
}
682
}
683
}
684
}
685
/* If this plugin has any environment variables, we will call
686
using execve and need to duplicate the environment from this
687
process, too. */
688
if(p->environ[0] != NULL){
689
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
696
perror("add_environment");
697
}
698
}
699
}
700
701
int pipefd[2];
382
702
ret = pipe(pipefd);
383
703
if (ret == -1){
384
704
perror("pipe");
385
705
exitstatus = EXIT_FAILURE;
386
goto end;
706
goto fallback;
387
707
}
388
708
ret = set_cloexec_flag(pipefd[0]);
389
709
if(ret < 0){
390
710
perror("set_cloexec_flag");
391
711
exitstatus = EXIT_FAILURE;
392
goto end;
712
goto fallback;
393
713
}
394
714
ret = set_cloexec_flag(pipefd[1]);
395
715
if(ret < 0){
396
716
perror("set_cloexec_flag");
397
717
exitstatus = EXIT_FAILURE;
398
goto end;
718
goto fallback;
399
719
}
400
720
/* Block SIGCHLD until process is safely in process list */
401
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
402
722
if(ret < 0){
403
723
perror("sigprocmask");
404
724
exitstatus = EXIT_FAILURE;
405
goto end;
725
goto fallback;
406
726
}
407
727
// Starting a new process to be watched
408
728
pid_t pid = fork();
729
if(pid == -1){
730
perror("fork");
731
exitstatus = EXIT_FAILURE;
732
goto fallback;
733
}
409
734
if(pid == 0){
410
735
/* this is the child process */
411
736
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
418
743
perror("sigprocmask");
419
744
_exit(EXIT_FAILURE);
420
745
}
421
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
746
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
if(ret == -1){
749
perror("dup2");
750
_exit(EXIT_FAILURE);
751
}
422
752
423
753
if(dirfd(dir) < 0){
424
754
/* If dir has no file descriptor, we could not set FD_CLOEXEC
425
755
above and must now close it manually here. */
426
756
closedir(dir);
427
757
}
428
if(execv(filename, p->argv) < 0){
429
perror("execv");
430
_exit(EXIT_FAILURE);
758
if(p->environ[0] == NULL){
759
if(execv(filename, p->argv) < 0){
760
perror("execv");
761
_exit(EXIT_FAILURE);
762
}
763
} else {
764
if(execve(filename, p->argv, p->environ) < 0){
765
perror("execve");
766
_exit(EXIT_FAILURE);
767
}
431
768
}
432
769
/* no return */
433
770
}
442
779
perror("sigprocmask");
443
780
}
444
781
exitstatus = EXIT_FAILURE;
445
goto end;
782
goto fallback;
446
783
}
447
784
448
785
*new_process = (struct process){ .pid = pid,
456
793
if(ret < 0){
457
794
perror("sigprocmask");
458
795
exitstatus = EXIT_FAILURE;
459
goto end;
796
goto fallback;
460
797
}
461
798
462
799
FD_SET(new_process->fd, &rfds_all);
467
804
468
805
}
469
806
470
/* Free the plugin list */
471
for(plugin *next; plugin_list != NULL; plugin_list = next){
472
next = plugin_list->next;
473
free(plugin_list->argv);
474
free(plugin_list);
475
}
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
476
809
477
810
closedir(dir);
478
811
dir = NULL;
479
812
480
813
if (process_list == NULL){
481
fprintf(stderr, "No plugin processes started, exiting\n");
482
exitstatus = EXIT_FAILURE;
483
goto end;
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
484
817
}
485
818
while(process_list){
486
819
fd_set rfds = rfds_all;
488
821
if (select_ret == -1){
489
822
perror("select");
490
823
exitstatus = EXIT_FAILURE;
491
goto end;
824
goto fallback;
492
825
}
493
826
/* OK, now either a process completed, or something can be read
494
827
from one of them */
501
834
/* Bad exit by plugin */
502
835
if(debug){
503
836
if(WIFEXITED(proc->status)){
504
fprintf(stderr, "Plugin %d exited with status %d\n",
505
proc->pid, WEXITSTATUS(proc->status));
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
839
WEXITSTATUS(proc->status));
506
840
} else if(WIFSIGNALED(proc->status)) {
507
fprintf(stderr, "Plugin %d killed by signal %d\n",
508
proc->pid, WTERMSIG(proc->status));
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
509
844
} else if(WCOREDUMP(proc->status)){
510
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
511
847
}
512
848
}
513
849
/* Remove the plugin */
514
850
FD_CLR(proc->fd, &rfds_all);
515
851
/* Block signal while modifying process_list */
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
517
853
if(ret < 0){
518
854
perror("sigprocmask");
519
855
exitstatus = EXIT_FAILURE;
520
goto end;
856
goto fallback;
521
857
}
522
858
/* Delete this process entry from the list */
523
859
if(process_list == proc){
546
882
break;
547
883
}
548
884
/* This process exited nicely, so print its buffer */
549
for(size_t written = 0; written < proc->buffer_length;
550
written += (size_t)ret){
551
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
552
proc->buffer + written,
553
proc->buffer_length
554
- written));
555
if(ret < 0){
556
perror("write");
557
exitstatus = EXIT_FAILURE;
558
goto end;
559
}
885
886
bool bret = print_out_password(proc->buffer,
887
proc->buffer_length);
888
if(not bret){
889
perror("print_out_password");
890
exitstatus = EXIT_FAILURE;
560
891
}
561
goto end;
892
goto fallback;
562
893
}
563
894
/* This process has not completed. Does it have any output? */
564
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
572
903
if (proc->buffer == NULL){
573
904
perror("malloc");
574
905
exitstatus = EXIT_FAILURE;
575
goto end;
906
goto fallback;
576
907
}
577
908
proc->buffer_size += BUFFER_SIZE;
578
909
}
591
922
}
592
923
}
593
924
}
594
if(process_list == NULL){
595
fprintf(stderr, "All plugin processes failed, exiting\n");
596
exitstatus = EXIT_FAILURE;
925
926
927
fallback:
928
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
930
/* Fallback if all plugins failed, none are found or an error
931
occured */
932
bool bret;
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
936
if(not bret){
937
perror("print_out_password");
938
exitstatus = EXIT_FAILURE;
939
}
597
940
}
598
941
599
end:
600
942
/* Restore old signal handler */
601
sigaction(SIGCHLD, &old_sigchld_action, NULL);
602
603
/* Free the plugin list */
604
for(plugin *next; plugin_list != NULL; plugin_list = next){
605
next = plugin_list->next;
606
free(plugin_list->argv);
607
free(plugin_list);
608
}
943
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
944
if(ret == -1){
945
perror("sigaction");
946
exitstatus = EXIT_FAILURE;
947
}
948
949
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
951
free(*arg);
952
}
953
free(custom_argv);
954
}
955
free_plugin_list(plugin_list);
609
956
610
957
if(dir != NULL){
611
958
closedir(dir);
615
962
for(process *next; process_list != NULL; process_list = next){
616
963
next = process_list->next;
617
964
close(process_list->fd);
618
kill(process_list->pid, SIGTERM);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
969
}
619
970
free(process_list->buffer);
620
971
free(process_list);
621
972
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0