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- Committer: Teddy Hogeborn
- Date: 2008-08-01 07:04:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20080801070432-5t1q0ds0bjxojyoz
* plugins.d/plugbasedclient.c (main): Close the pipe fd after dup2:ing
it onto stdout.
it onto stdout.
- files added:
- ca.pem
- files removed:
- COPYING
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
24
#include <stdio.h> /* popen(), fileno(), fprintf(),
25
stderr, STDOUT_FILENO */
42
26
#include <iso646.h> /* and, or, not */
27
#include <sys/types.h> /* DIR, opendir(), stat(), struct stat,
28
waitpid(), WIFEXITED(),
29
WEXITSTATUS(), wait() */
30
#include <sys/wait.h> /* wait() */
43
31
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
32
readdir(), closedir() */
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
34
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
35
fcntl() */
36
#include <fcntl.h> /* fcntl() */
37
#include <stddef.h> /* NULL */
38
#include <stdlib.h> /* EXIT_FAILURE */
39
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
40
FD_SET(), FD_ISSET() */
41
#include <string.h> /* strlen(), strcpy(), strcat() */
42
#include <stdbool.h> /* true */
43
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
44
WEXITSTATUS() */
55
45
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
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>";
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
48
argp_parse() */
72
49
73
50
struct process;
74
51
78
55
char *buffer;
79
56
size_t buffer_size;
80
57
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
58
struct process *next;
85
59
} process;
86
60
88
62
char *name; /* can be NULL or any plugin name */
89
63
char **argv;
90
64
int argc;
91
char **environ;
92
int envc;
93
65
bool disabled;
94
66
struct plugin *next;
95
67
} plugin;
96
68
97
static plugin *getplugin(char *name, plugin **plugin_list){
69
plugin *getplugin(char *name, plugin **plugin_list){
98
70
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
71
if ((p->name == name)
100
72
or (p->name and name and (strcmp(p->name, name) == 0))){
104
76
/* Create a new plugin */
105
77
plugin *new_plugin = malloc(sizeof(plugin));
106
78
if (new_plugin == NULL){
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
79
perror("malloc");
80
exit(EXIT_FAILURE);
81
}
82
new_plugin->name = name;
123
83
new_plugin->argv = malloc(sizeof(char *) * 2);
124
84
if (new_plugin->argv == NULL){
125
free(copy_name);
126
free(new_plugin);
127
return NULL;
85
perror("malloc");
86
exit(EXIT_FAILURE);
128
87
}
129
new_plugin->argv[0] = copy_name;
88
new_plugin->argv[0] = name;
130
89
new_plugin->argv[1] = NULL;
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;
90
new_plugin->argc = 1;
91
new_plugin->disabled = false;
92
new_plugin->next = *plugin_list;
140
93
/* Append the new plugin to the list */
141
94
*plugin_list = new_plugin;
142
95
return new_plugin;
143
96
}
144
97
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
98
void addargument(plugin *p, char *arg){
99
p->argv[p->argc] = arg;
100
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
101
if (p->argv == NULL){
102
perror("malloc");
103
exit(EXIT_FAILURE);
104
}
105
p->argc++;
106
p->argv[p->argc] = NULL;
107
}
184
108
185
109
/*
186
110
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
111
* Descriptor Flags".
188
112
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
113
*/
190
static int set_cloexec_flag(int fd)
114
int set_cloexec_flag(int fd)
191
115
{
192
116
int ret = fcntl(fd, F_GETFD, 0);
193
117
/* If reading the flags failed, return error indication now. */
198
122
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
123
}
200
124
201
process *process_list = NULL;
202
203
/* Mark processes as completed when they exit, and save their exit
204
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
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
}
285
}
125
126
#define BUFFER_SIZE 256
127
128
const char *argp_program_version =
129
"plugbasedclient 0.9";
130
const char *argp_program_bug_address =
131
"<mandos@fukt.bsnet.se>";
286
132
287
133
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
290
FILE *conffp;
134
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
291
135
size_t d_name_len;
292
DIR *dir = NULL;
136
DIR *dir;
293
137
struct dirent *dirst;
294
138
struct stat st;
295
139
fd_set rfds_all;
296
140
int ret, maxfd = 0;
297
uid_t uid = 65534;
298
gid_t gid = 65534;
141
process *process_list = NULL;
299
142
bool debug = false;
300
143
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;
306
307
/* Establish a signal handler */
308
sigemptyset(&sigchld_action.sa_mask);
309
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
310
if(ret == -1){
311
perror("sigaddset");
312
exitstatus = EXIT_FAILURE;
313
goto fallback;
314
}
315
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
316
if(ret == -1){
317
perror("sigaction");
318
exitstatus = EXIT_FAILURE;
319
goto fallback;
320
}
321
144
322
145
/* The options we understand. */
323
146
struct argp_option options[] = {
324
147
{ .name = "global-options", .key = 'g',
325
148
.arg = "OPTION[,OPTION[,...]]",
326
149
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
328
.arg = "VAR=value",
329
.doc = "Environment variable passed to all plugins" },
330
150
{ .name = "options-for", .key = 'o',
331
151
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
152
.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" },
336
153
{ .name = "disable", .key = 'd',
337
154
.arg = "PLUGIN",
338
155
.doc = "Disable a specific plugin", .group = 1 },
339
156
{ .name = "plugin-dir", .key = 128,
340
157
.arg = "DIRECTORY",
341
158
.doc = "Specify a different plugin directory", .group = 2 },
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,
159
{ .name = "debug", .key = 129,
349
160
.doc = "Debug mode", .group = 3 },
350
161
{ .name = NULL }
351
162
};
352
163
353
164
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
165
/* Get the INPUT argument from `argp_parse', which we
166
know is a pointer to our plugin list pointer. */
356
167
plugin **plugins = state->input;
357
168
switch (key) {
358
169
case 'g':
359
170
if (arg != NULL){
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
}
171
char *p = strtok(arg, ",");
172
do{
173
addargument(getplugin(NULL, plugins), p);
174
p = strtok(NULL, ",");
175
} while (p);
384
176
}
385
177
break;
386
178
case 'o':
387
179
if (arg != NULL){
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");
180
char *name = strtok(arg, ":");
181
char *p = strtok(NULL, ":");
182
if(p){
183
p = strtok(p, ",");
184
do{
185
addargument(getplugin(name, plugins), p);
186
p = strtok(NULL, ",");
187
} while (p);
426
188
}
427
189
}
428
190
break;
429
191
case 'd':
430
192
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
432
if(p == NULL){
433
return ARGP_ERR_UNKNOWN;
434
}
435
p->disabled = true;
193
getplugin(arg, plugins)->disabled = true;
436
194
}
437
195
break;
438
196
case 128:
439
197
plugindir = arg;
440
198
break;
441
199
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:
448
200
debug = true;
449
201
break;
450
202
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
203
argp_usage (state);
452
204
break;
453
205
case ARGP_KEY_END:
454
206
break;
461
213
plugin *plugin_list = NULL;
462
214
463
215
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
216
.args_doc = "",
465
217
.doc = "Mandos plugin runner -- Run plugins" };
466
218
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
}
219
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
525
220
526
221
if(debug){
527
222
for(plugin *p = plugin_list; p != NULL; p=p->next){
530
225
for(char **a = p->argv; *a != NULL; a++){
531
226
fprintf(stderr, "\tArg: %s\n", *a);
532
227
}
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
}
537
228
}
538
229
}
539
230
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
550
231
dir = opendir(plugindir);
232
/* Set the FD_CLOEXEC flag on the directory */
233
ret = set_cloexec_flag(dirfd(dir));
234
if(ret < 0){
235
perror("set_cloexec_flag");
236
goto end;
237
}
238
551
239
if(dir == NULL){
552
perror("Could not open plugin dir");
553
exitstatus = EXIT_FAILURE;
554
goto fallback;
555
}
556
557
/* Set the FD_CLOEXEC flag on the directory, if possible */
558
{
559
int dir_fd = dirfd(dir);
560
if(dir_fd >= 0){
561
ret = set_cloexec_flag(dir_fd);
562
if(ret < 0){
563
perror("set_cloexec_flag");
564
exitstatus = EXIT_FAILURE;
565
goto fallback;
566
}
567
}
240
fprintf(stderr, "Can not open directory\n");
241
return EXIT_FAILURE;
568
242
}
569
243
570
244
FD_ZERO(&rfds_all);
574
248
575
249
// All directory entries have been processed
576
250
if(dirst == NULL){
577
if (errno == EBADF){
578
perror("readdir");
579
exitstatus = EXIT_FAILURE;
580
goto fallback;
581
}
582
251
break;
583
252
}
584
253
598
267
if((d_name_len >= pre_len)
599
268
and strncmp((dirst->d_name), *pre, pre_len) == 0){
600
269
if(debug){
601
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
270
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
602
271
" with bad prefix %s\n", dirst->d_name, *pre);
603
272
}
604
273
bad_name = true;
616
285
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
617
286
== 0)){
618
287
if(debug){
619
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
288
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
620
289
" with bad suffix %s\n", dirst->d_name, *suf);
621
290
}
622
291
bad_name = true;
628
297
continue;
629
298
}
630
299
}
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
}
645
300
301
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
302
if (filename == NULL){
303
perror("malloc");
304
exitstatus =EXIT_FAILURE;
305
goto end;
306
}
307
strcpy(filename, plugindir);
308
strcat(filename, "/");
309
strcat(filename, dirst->d_name);
310
311
stat(filename, &st);
312
646
313
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
647
314
if(debug){
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
315
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
649
316
" with bad type or mode\n", filename);
650
317
}
651
free(filename);
652
continue;
318
continue;
319
}
320
if(getplugin(dirst->d_name, &plugin_list)->disabled){
321
if(debug){
322
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
323
dirst->d_name);
324
}
325
continue;
326
}
327
// Starting a new process to be watched
328
int pipefd[2];
329
ret = pipe(pipefd);
330
if (ret == -1){
331
perror("pipe");
332
goto end;
653
333
}
654
334
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){
661
if(debug){
662
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
663
dirst->d_name);
664
}
665
free(filename);
666
continue;
667
}
668
335
{
669
336
/* Add global arguments to argument list for this plugin */
670
337
plugin *g = getplugin(NULL, &plugin_list);
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];
702
ret = pipe(pipefd);
703
if (ret == -1){
704
perror("pipe");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
708
ret = set_cloexec_flag(pipefd[0]);
709
if(ret < 0){
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
712
goto fallback;
713
}
714
ret = set_cloexec_flag(pipefd[1]);
715
if(ret < 0){
716
perror("set_cloexec_flag");
717
exitstatus = EXIT_FAILURE;
718
goto fallback;
719
}
720
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
722
if(ret < 0){
723
perror("sigprocmask");
724
exitstatus = EXIT_FAILURE;
725
goto fallback;
726
}
727
// Starting a new process to be watched
338
for(char **a = g->argv + 1; *a != NULL; a++){
339
addargument(p, *a);
340
}
341
}
728
342
pid_t pid = fork();
729
if(pid == -1){
730
perror("fork");
731
exitstatus = EXIT_FAILURE;
732
goto fallback;
733
}
734
343
if(pid == 0){
735
344
/* this is the child process */
736
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
737
if(ret < 0){
738
perror("sigaction");
739
_exit(EXIT_FAILURE);
740
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
if(ret < 0){
743
perror("sigprocmask");
744
_exit(EXIT_FAILURE);
745
}
746
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
if(ret == -1){
749
perror("dup2");
750
_exit(EXIT_FAILURE);
345
closedir(dir);
346
close(pipefd[0]); /* close unused read end of pipe */
347
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
348
if(pipefd[1] > 2){
349
close(pipefd[1]);
751
350
}
752
351
753
if(dirfd(dir) < 0){
754
/* If dir has no file descriptor, we could not set FD_CLOEXEC
755
above and must now close it manually here. */
756
closedir(dir);
757
}
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
}
352
if(execv(filename, p->argv) < 0){
353
perror(argv[0]);
354
close(pipefd[1]);
355
_exit(EXIT_FAILURE);
768
356
}
769
357
/* no return */
770
358
}
771
/* parent process */
772
free(filename);
773
359
close(pipefd[1]); /* close unused write end of pipe */
774
360
process *new_process = malloc(sizeof(process));
775
361
if (new_process == NULL){
776
362
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
if(ret < 0){
779
perror("sigprocmask");
780
}
781
exitstatus = EXIT_FAILURE;
782
goto fallback;
783
}
784
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
790
/* Unblock SIGCHLD so signal handler can be run if this process
791
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
793
if(ret < 0){
794
perror("sigprocmask");
795
exitstatus = EXIT_FAILURE;
796
goto fallback;
797
}
798
363
exitstatus = EXIT_FAILURE;
364
goto end;
365
}
366
367
new_process->fd = pipefd[0];
368
new_process->buffer = malloc(BUFFER_SIZE);
369
if (new_process->buffer == NULL){
370
perror("malloc");
371
exitstatus = EXIT_FAILURE;
372
goto end;
373
}
374
new_process->buffer_size = BUFFER_SIZE;
375
new_process->buffer_length = 0;
799
376
FD_SET(new_process->fd, &rfds_all);
800
377
801
378
if (maxfd < new_process->fd){
802
379
maxfd = new_process->fd;
803
380
}
804
381
382
//List handling
383
new_process->next = process_list;
384
process_list = new_process;
805
385
}
806
386
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
387
closedir(dir);
811
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
817
}
818
while(process_list){
819
fd_set rfds = rfds_all;
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
822
perror("select");
823
exitstatus = EXIT_FAILURE;
824
goto fallback;
825
}
826
/* OK, now either a process completed, or something can be read
827
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
829
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
831
/* Only accept the plugin output if it exited cleanly */
832
if(not WIFEXITED(proc->status)
833
or WEXITSTATUS(proc->status) != 0){
834
/* Bad exit by plugin */
835
if(debug){
836
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
839
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
844
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
847
}
848
}
849
/* Remove the plugin */
850
FD_CLR(proc->fd, &rfds_all);
851
/* Block signal while modifying process_list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
856
goto fallback;
857
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
388
389
if (process_list != NULL){
390
while(true){
391
fd_set rfds = rfds_all;
392
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
393
if (select_ret == -1){
394
perror(argv[0]);
395
goto end;
396
}else{
397
for(process *process_itr = process_list; process_itr != NULL;
398
process_itr = process_itr->next){
399
if(FD_ISSET(process_itr->fd, &rfds)){
400
if(process_itr->buffer_length + BUFFER_SIZE
401
> process_itr->buffer_size){
402
process_itr->buffer = realloc(process_itr->buffer,
403
process_itr->buffer_size
404
+ (size_t) BUFFER_SIZE);
405
if (process_itr->buffer == NULL){
406
perror(argv[0]);
407
goto end;
408
}
409
process_itr->buffer_size += BUFFER_SIZE;
410
}
411
ret = read(process_itr->fd, process_itr->buffer
412
+ process_itr->buffer_length, BUFFER_SIZE);
413
if(ret < 0){
414
/* Read error from this process; ignore it */
415
continue;
416
}
417
process_itr->buffer_length += (size_t) ret;
418
if(ret == 0){
419
/* got EOF */
420
/* wait for process exit */
421
int status;
422
waitpid(process_itr->pid, &status, 0);
423
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
424
for(size_t written = 0;
425
written < process_itr->buffer_length;){
426
ret = write(STDOUT_FILENO,
427
process_itr->buffer + written,
428
process_itr->buffer_length - written);
429
if(ret < 0){
430
perror(argv[0]);
431
goto end;
432
}
433
written += (size_t)ret;
434
}
435
goto end;
436
} else {
437
FD_CLR(process_itr->fd, &rfds_all);
868
438
}
869
439
}
870
440
}
871
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
874
if(ret < 0){
875
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
883
}
884
/* This process exited nicely, so print its buffer */
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;
891
}
892
goto fallback;
893
}
894
/* This process has not completed. Does it have any output? */
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
896
/* This process had nothing to say at this time */
897
continue;
898
}
899
/* Before reading, make the process' data buffer large enough */
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
904
perror("malloc");
905
exitstatus = EXIT_FAILURE;
906
goto fallback;
907
}
908
proc->buffer_size += BUFFER_SIZE;
909
}
910
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
914
/* Read error from this process; ignore the error */
915
continue;
916
}
917
if(ret == 0){
918
/* got EOF */
919
proc->eof = true;
920
} else {
921
proc->buffer_length += (size_t) ret;
922
}
923
}
924
}
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
}
940
}
941
942
/* Restore old signal handler */
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);
956
957
if(dir != NULL){
958
closedir(dir);
959
}
960
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
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
}
970
free(process_list->buffer);
971
free(process_list);
972
}
973
974
/* Wait for any remaining child processes to terminate */
975
do{
976
ret = wait(NULL);
977
} while(ret >= 0);
978
if(errno != ECHILD){
979
perror("wait");
980
}
981
441
}
442
}
443
}
444
}
445
446
end:
447
for(process *process_itr = process_list; process_itr != NULL;
448
process_itr = process_itr->next){
449
close(process_itr->fd);
450
kill(process_itr->pid, SIGTERM);
451
free(process_itr->buffer);
452
}
453
454
while(true){
455
int status;
456
ret = wait(&status);
457
if (ret == -1){
458
if(errno != ECHILD){
459
perror("wait");
460
}
461
break;
462
}
463
}
982
464
return exitstatus;
983
465
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0