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- Committer: Björn Påhlsson
- Date: 2008-08-11 16:09:41 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 66.
- Revision ID: belorn@braxen-20080811160941-wq2xnhg00py1wzxq
Fixed unkown -> unknown
updated TODO
updated TODO
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
mandos-client.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
61
59
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
66
74
67
#define BUFFER_SIZE 256
75
68
76
#define PDIR "/lib/mandos/plugins.d"
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
79
const char *argp_program_version = "plugin-runner " VERSION;
69
const char *argp_program_version = "mandos-client 1.0";
80
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
71
82
typedef struct plugin{
83
char *name; /* can be NULL or any plugin name */
84
char **argv;
85
int argc;
86
char **environ;
87
int envc;
88
bool disabled;
89
90
/* Variables used for running processes*/
72
struct process;
73
74
typedef struct process{
91
75
pid_t pid;
92
76
int fd;
93
77
char *buffer;
94
78
size_t buffer_size;
95
79
size_t buffer_length;
96
80
bool eof;
97
volatile sig_atomic_t completed;
81
bool completed;
98
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;
99
91
struct plugin *next;
100
92
} plugin;
101
93
102
static plugin *plugin_list = NULL;
103
104
/* Gets an existing plugin based on name,
105
or if none is found, creates a new one */
106
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
111
98
return p;
112
99
}
113
100
}
114
101
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
120
return NULL;
121
}
122
char *copy_name = NULL;
123
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
return NULL;
132
}
133
}
134
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
139
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
145
free(copy_name);
146
free(new_plugin);
147
errno = e;
148
return NULL;
149
}
150
new_plugin->argv[0] = copy_name;
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
new_plugin->argv[0] = name;
151
114
new_plugin->argv[1] = NULL;
152
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
156
if(new_plugin->environ == NULL){
157
int e = errno;
158
free(copy_name);
159
free(new_plugin->argv);
160
free(new_plugin);
161
errno = e;
162
return NULL;
163
}
164
new_plugin->environ[0] = NULL;
165
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
166
118
/* Append the new plugin to the list */
167
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
168
120
return new_plugin;
169
121
}
170
122
171
/* Helper function for add_argument and add_environment */
172
static bool add_to_char_array(const char *new, char ***array,
173
int *len){
174
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
179
/* Malloc check */
180
if(*array == NULL){
181
return false;
182
}
183
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
188
if(copy == NULL){
189
return false;
190
}
191
/* Insert the copy */
192
(*array)[*len] = copy;
193
(*len)++;
194
/* Add a new terminating NULL pointer to the last element */
195
(*array)[*len] = NULL;
196
return true;
197
}
198
199
/* Add to a plugin's argument vector */
200
static bool add_argument(plugin *p, const char *arg){
201
if(p == NULL){
202
return false;
203
}
204
return add_to_char_array(arg, &(p->argv), &(p->argc));
205
}
206
207
/* Add to a plugin's environment */
208
static bool add_environment(plugin *p, const char *def, bool replace){
209
if(p == NULL){
210
return false;
211
}
212
/* namelen = length of name of environment variable */
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
217
/* It already exists */
218
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
224
return false;
225
}
226
*e = new;
227
strcpy(*e, def);
228
}
229
return true;
230
}
231
}
232
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;
233
132
}
234
133
235
134
/*
236
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
136
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
138
*/
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
242
142
/* If reading the flags failed, return error indication now. */
243
143
if(ret < 0){
244
144
return ret;
245
145
}
246
146
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
148
}
250
149
150
process *process_list = NULL;
251
151
252
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
253
153
status. */
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
256
while(true){
257
plugin *proc = plugin_list;
258
int status;
259
pid_t pid = waitpid(-1, &status, WNOHANG);
260
if(pid == 0){
261
/* Only still running child processes */
262
break;
263
}
264
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
268
}
269
perror("waitpid");
270
}
271
272
/* A child exited, find it in process_list */
273
while(proc != NULL and proc->pid != pid){
274
proc = proc->next;
275
}
276
if(proc == NULL){
277
/* Process not found in process list */
278
continue;
279
}
280
proc->status = status;
281
proc->completed = 1;
282
}
283
errno = old_errno;
154
void handle_sigchld(__attribute__((unused)) int sig){
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;
284
171
}
285
172
286
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
173
bool print_out_password(const char *buffer, size_t length){
288
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
289
178
for(size_t written = 0; written < length; written += (size_t)ret){
290
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
180
length - written));
296
185
return true;
297
186
}
298
187
299
/* Removes and free a plugin from the plugin list */
300
static void free_plugin(plugin *plugin_node){
301
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
303
free(*arg);
304
}
305
free(plugin_node->argv);
306
for(char **env = plugin_node->environ; *env != NULL; env++){
307
free(*env);
308
}
309
free(plugin_node->environ);
310
free(plugin_node->buffer);
311
312
/* Removes the plugin from the singly-linked list */
313
if(plugin_node == plugin_list){
314
/* First one - simple */
315
plugin_list = plugin_list->next;
316
} else {
317
/* Second one or later */
318
for(plugin *p = plugin_list; p != NULL; p = p->next){
319
if(p->next == plugin_node){
320
p->next = plugin_node->next;
321
break;
322
}
323
}
324
}
325
326
free(plugin_node);
327
}
328
329
static void free_plugin_list(void){
330
while(plugin_list != NULL){
331
free_plugin(plugin_list);
332
}
333
}
334
335
188
int main(int argc, char *argv[]){
336
char *plugindir = NULL;
337
char *argfile = NULL;
338
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
339
190
size_t d_name_len;
340
191
DIR *dir = NULL;
341
192
struct dirent *dirst;
342
193
struct stat st;
343
194
fd_set rfds_all;
344
195
int ret, maxfd = 0;
345
ssize_t sret;
346
196
uid_t uid = 65534;
347
197
gid_t gid = 65534;
348
198
bool debug = false;
350
200
struct sigaction old_sigchld_action;
351
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
352
202
.sa_flags = SA_NOCLDSTOP };
353
char **custom_argv = NULL;
354
int custom_argc = 0;
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
355
205
356
206
/* Establish a signal handler */
357
207
sigemptyset(&sigchld_action.sa_mask);
358
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
if(ret == -1){
209
if(ret < 0){
360
210
perror("sigaddset");
361
exitstatus = EX_OSERR;
362
goto fallback;
211
exit(EXIT_FAILURE);
363
212
}
364
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
if(ret == -1){
214
if(ret < 0){
366
215
perror("sigaction");
367
exitstatus = EX_OSERR;
368
goto fallback;
216
exit(EXIT_FAILURE);
369
217
}
370
218
371
219
/* The options we understand. */
373
221
{ .name = "global-options", .key = 'g',
374
222
.arg = "OPTION[,OPTION[,...]]",
375
223
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
377
.arg = "VAR=value",
378
.doc = "Environment variable passed to all plugins" },
379
224
{ .name = "options-for", .key = 'o',
380
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
226
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
383
.arg = "PLUGIN:ENV=value",
384
.doc = "Environment variable passed to specified plugin" },
385
227
{ .name = "disable", .key = 'd',
386
228
.arg = "PLUGIN",
387
229
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
389
.arg = "PLUGIN",
390
.doc = "Enable a specific plugin", .group = 1 },
391
230
{ .name = "plugin-dir", .key = 128,
392
231
.arg = "DIRECTORY",
393
232
.doc = "Specify a different plugin directory", .group = 2 },
394
{ .name = "config-file", .key = 129,
395
.arg = "FILE",
396
.doc = "Specify a different configuration file", .group = 2 },
397
{ .name = "userid", .key = 130,
398
.arg = "ID", .flags = 0,
399
.doc = "User ID the plugins will run as", .group = 3 },
400
{ .name = "groupid", .key = 131,
401
.arg = "ID", .flags = 0,
402
.doc = "Group ID the plugins will run as", .group = 3 },
403
{ .name = "debug", .key = 132,
404
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
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 },
414
241
{ .name = NULL }
415
242
};
416
243
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
422
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
428
}
429
}
430
}
431
break;
432
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
434
break;
435
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
454
}
455
}
456
}
457
break;
458
case 'E': /* --env-for */
459
{
460
char *envdef = strchr(arg, ':');
461
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
add_environment(getplugin(arg), envdef, true);
474
}
475
break;
476
case 'd': /* --disable */
477
{
478
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
481
}
482
}
483
break;
484
case 'e': /* --enable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
489
}
490
}
491
break;
492
case 128: /* --plugin-dir */
493
free(plugindir);
494
plugindir = strdup(arg);
495
break;
496
case 129: /* --config-file */
497
/* This is already done by parse_opt_config_file() */
498
break;
499
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
508
break;
509
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
518
break;
519
case 132: /* --debug */
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;
248
switch (key) {
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:
280
uid = (uid_t)strtol(arg, NULL, 10);
281
break;
282
case 130:
283
gid = (gid_t)strtol(arg, NULL, 10);
284
break;
285
case 131:
520
286
debug = true;
521
287
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
288
case ARGP_KEY_ARG:
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
546
291
}
547
default:
548
return ARGP_ERR_UNKNOWN;
549
}
550
return errno; /* Set to 0 at start */
551
}
552
553
/* This option parser is the same as parse_opt() above, except it
554
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
560
case 'g': /* --global-options */
561
case 'G': /* --global-env */
562
case 'o': /* --options-for */
563
case 'E': /* --env-for */
564
case 'd': /* --disable */
565
case 'e': /* --enable */
566
case 128: /* --plugin-dir */
567
break;
568
case 129: /* --config-file */
569
free(argfile);
570
argfile = strdup(arg);
571
break;
572
case 130: /* --userid */
573
case 131: /* --groupid */
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
case ARGP_KEY_ARG:
579
break;
580
default:
581
return ARGP_ERR_UNKNOWN;
582
}
583
return errno;
584
}
585
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
588
.args_doc = "",
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
589
306
.doc = "Mandos plugin runner -- Run plugins" };
590
307
591
/* Parse using parse_opt_config_file() in order to get the custom
592
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
607
goto fallback;
608
}
609
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
612
613
/* Open the configfile if available */
614
if(argfile == NULL){
615
conffp = fopen(AFILE, "r");
616
} else {
617
conffp = fopen(argfile, "r");
618
}
619
if(conffp != NULL){
620
char *org_line = NULL;
621
char *p, *arg, *new_arg, *line;
622
size_t size = 0;
623
const char whitespace_delims[] = " \r\t\f\v\n";
624
const char comment_delim[] = "#";
625
626
custom_argc = 1;
627
custom_argv = malloc(sizeof(char*) * 2);
628
if(custom_argv == NULL){
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
if (ret == ARGP_ERR_UNKNOWN){
310
fprintf(stderr, "Unknown error while parsing arguments\n");
311
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
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){
629
325
perror("malloc");
630
exitstatus = EX_OSERR;
631
goto fallback;
632
}
633
custom_argv[0] = argv[0];
634
custom_argv[1] = NULL;
635
636
/* for each line in the config file, strip whitespace and ignore
637
commented text */
638
while(true){
639
sret = getline(&org_line, &size, conffp);
640
if(sret == -1){
641
break;
642
}
643
644
line = org_line;
645
arg = strsep(&line, comment_delim);
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
647
if(p[0] == '\0'){
648
continue;
649
}
650
new_arg = strdup(p);
651
if(new_arg == NULL){
652
perror("strdup");
653
exitstatus = EX_OSERR;
654
free(org_line);
655
goto fallback;
656
}
657
658
custom_argc += 1;
659
custom_argv = realloc(custom_argv, sizeof(char *)
660
* ((unsigned int) custom_argc + 1));
661
if(custom_argv == NULL){
662
perror("realloc");
663
exitstatus = EX_OSERR;
664
free(org_line);
665
goto fallback;
666
}
667
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
669
}
670
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
free(org_line);
680
} else {
681
/* Check for harmful errors and go to fallback. Other errors might
682
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
685
exitstatus = EX_OSERR;
686
goto fallback;
687
}
688
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
691
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
706
goto fallback;
707
}
708
}
709
710
/* Parse actual command line arguments, to let them override the
711
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
726
goto fallback;
326
exitstatus = EXIT_FAILURE;
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);
346
if (ret == ARGP_ERR_UNKNOWN){
347
fprintf(stderr, "Unknown error while parsing arguments\n");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
727
351
}
728
352
729
353
if(debug){
733
357
for(char **a = p->argv; *a != NULL; a++){
734
358
fprintf(stderr, "\tArg: %s\n", *a);
735
359
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
737
for(char **a = p->environ; *a != NULL; a++){
738
fprintf(stderr, "\t%s\n", *a);
739
}
740
360
}
741
361
}
742
362
743
/* Strip permissions down to nobody */
363
ret = setuid(uid);
364
if (ret == -1){
365
perror("setuid");
366
}
367
744
368
setgid(gid);
745
if(ret == -1){
369
if (ret == -1){
746
370
perror("setgid");
747
371
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
372
373
dir = opendir(plugindir);
374
if(dir == NULL){
375
perror("Could not open plugin dir");
376
exitstatus = EXIT_FAILURE;
377
goto end;
751
378
}
752
379
753
/* Open plugin directory with close_on_exec flag */
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
381
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
382
int dir_fd = dirfd(dir);
383
if(dir_fd >= 0){
384
ret = set_cloexec_flag(dir_fd);
385
if(ret < 0){
386
perror("set_cloexec_flag");
387
exitstatus = EXIT_FAILURE;
388
goto end;
389
}
796
390
}
797
391
}
798
392
799
393
FD_ZERO(&rfds_all);
800
394
801
/* Read and execute any executable in the plugin directory*/
802
395
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
396
dirst = readdir(dir);
806
397
807
/* All directory entries have been processed */
398
// All directory entries have been processed
808
399
if(dirst == NULL){
809
if(errno == EBADF){
400
if (errno == EBADF){
810
401
perror("readdir");
811
exitstatus = EX_IOERR;
812
goto fallback;
402
exitstatus = EXIT_FAILURE;
403
goto end;
813
404
}
814
405
break;
815
406
}
816
407
817
408
d_name_len = strlen(dirst->d_name);
818
409
819
/* Ignore dotfiles, backup files and other junk */
410
// Ignore dotfiles, backup files and other junk
820
411
{
821
412
bool bad_name = false;
822
413
824
415
825
416
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
417
".dpkg-old",
827
".dpkg-bak",
828
418
".dpkg-divert", NULL };
829
419
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
420
size_t pre_len = strlen(*pre);
838
428
break;
839
429
}
840
430
}
431
841
432
if(bad_name){
842
433
continue;
843
434
}
435
844
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
437
size_t suf_len = strlen(*suf);
846
438
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
439
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
440
== 0)){
849
441
if(debug){
850
442
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
860
452
}
861
453
}
862
454
863
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
872
if(ret < 0){
873
perror("asprintf");
874
continue;
875
}
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
strcpy(filename, plugindir); /* Spurious warning */
462
strcat(filename, "/"); /* Spurious warning */
463
strcat(filename, dirst->d_name); /* Spurious warning */
876
464
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
465
ret = stat(filename, &st);
466
if (ret == -1){
879
467
perror("stat");
880
free(filename);
881
continue;
468
exitstatus = EXIT_FAILURE;
469
goto end;
882
470
}
883
471
884
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
472
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
473
if(debug){
888
474
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
475
" with bad type or mode\n", filename);
891
477
free(filename);
892
478
continue;
893
479
}
894
895
plugin *p = getplugin(dirst->d_name);
896
if(p == NULL){
897
perror("getplugin");
898
free(filename);
899
continue;
900
}
901
if(p->disabled){
480
if(getplugin(dirst->d_name, &plugin_list)->disabled){
902
481
if(debug){
903
482
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
904
483
dirst->d_name);
906
485
free(filename);
907
486
continue;
908
487
}
488
plugin *p = getplugin(dirst->d_name, &plugin_list);
909
489
{
910
490
/* Add global arguments to argument list for this plugin */
911
plugin *g = getplugin(NULL);
912
if(g != NULL){
913
for(char **a = g->argv + 1; *a != NULL; a++){
914
if(not add_argument(p, *a)){
915
perror("add_argument");
916
}
917
}
918
/* Add global environment variables */
919
for(char **e = g->environ; *e != NULL; e++){
920
if(not add_environment(p, *e, false)){
921
perror("add_environment");
922
}
923
}
924
}
925
}
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
928
process, too. */
929
if(p->environ[0] != NULL){
930
for(char **e = environ; *e != NULL; e++){
931
if(not add_environment(p, *e, false)){
932
perror("add_environment");
933
}
934
}
935
}
936
937
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
491
plugin *g = getplugin(NULL, &plugin_list);
492
for(char **a = g->argv + 1; *a != NULL; a++){
493
addargument(p, *a);
494
}
495
}
496
int pipefd[2];
497
ret = pipe(pipefd);
498
if (ret == -1){
940
499
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
500
exitstatus = EXIT_FAILURE;
501
goto end;
943
502
}
944
/* Ask OS to automatic close the pipe on exec */
945
503
ret = set_cloexec_flag(pipefd[0]);
946
504
if(ret < 0){
947
505
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
949
goto fallback;
506
exitstatus = EXIT_FAILURE;
507
goto end;
950
508
}
951
509
ret = set_cloexec_flag(pipefd[1]);
952
510
if(ret < 0){
953
511
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
955
goto fallback;
512
exitstatus = EXIT_FAILURE;
513
goto end;
956
514
}
957
515
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
517
if(ret < 0){
962
518
perror("sigprocmask");
963
exitstatus = EX_OSERR;
964
goto fallback;
965
}
966
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
971
if(pid == -1){
972
perror("fork");
973
exitstatus = EX_OSERR;
974
goto fallback;
975
}
519
exitstatus = EXIT_FAILURE;
520
goto end;
521
}
522
// Starting a new process to be watched
523
pid_t pid = fork();
976
524
if(pid == 0){
977
525
/* this is the child process */
978
526
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
527
if(ret < 0){
980
528
perror("sigaction");
981
_exit(EX_OSERR);
529
_exit(EXIT_FAILURE);
982
530
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
531
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
532
if(ret < 0){
985
533
perror("sigprocmask");
986
_exit(EX_OSERR);
534
_exit(EXIT_FAILURE);
987
535
}
988
536
989
537
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
538
if(ret == -1){
991
539
perror("dup2");
992
_exit(EX_OSERR);
540
_exit(EXIT_FAILURE);
993
541
}
994
542
995
543
if(dirfd(dir) < 0){
997
545
above and must now close it manually here. */
998
546
closedir(dir);
999
547
}
1000
if(p->environ[0] == NULL){
1001
if(execv(filename, p->argv) < 0){
1002
perror("execv");
1003
_exit(EX_OSERR);
1004
}
1005
} else {
1006
if(execve(filename, p->argv, p->environ) < 0){
1007
perror("execve");
1008
_exit(EX_OSERR);
1009
}
548
if(execv(filename, p->argv) < 0){
549
perror("execv");
550
_exit(EXIT_FAILURE);
1010
551
}
1011
552
/* no return */
1012
553
}
1013
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
554
/* parent process */
1016
555
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
1019
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
556
close(pipefd[1]); /* close unused write end of pipe */
557
process *new_process = malloc(sizeof(process));
558
if (new_process == NULL){
559
perror("malloc");
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
561
if(ret < 0){
1024
perror("sigprocmask");
562
perror("sigprocmask");
1025
563
}
1026
exitstatus = EX_OSERR;
1027
goto fallback;
564
exitstatus = EXIT_FAILURE;
565
goto end;
1028
566
}
1029
567
1030
new_plugin->pid = pid;
1031
new_plugin->fd = pipefd[0];
1032
568
*new_process = (struct process){ .pid = pid,
569
.fd = pipefd[0],
570
.next = process_list };
571
// List handling
572
process_list = new_process;
1033
573
/* Unblock SIGCHLD so signal handler can be run if this process
1034
574
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
575
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
576
if(ret < 0){
1039
577
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
1041
goto fallback;
1042
}
1043
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1046
1047
if(maxfd < new_plugin->fd){
1048
maxfd = new_plugin->fd;
1049
}
1050
}
1051
1052
TEMP_FAILURE_RETRY(closedir(dir));
578
exitstatus = EXIT_FAILURE;
579
goto end;
580
}
581
582
FD_SET(new_process->fd, &rfds_all);
583
584
if (maxfd < new_process->fd){
585
maxfd = new_process->fd;
586
}
587
588
}
589
590
/* Free the plugin list */
591
for(plugin *next; plugin_list != NULL; plugin_list = next){
592
next = plugin_list->next;
593
free(plugin_list->argv);
594
free(plugin_list);
595
}
596
597
closedir(dir);
1053
598
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
if(p->pid != 0){
1058
break;
1059
}
1060
if(p->next == NULL){
1061
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1062
" directory?\n");
1063
free_plugin_list();
1064
}
599
600
if (process_list == NULL){
601
fprintf(stderr, "No plugin processes started. Incorrect plugin"
602
" directory?\n");
603
process_list = NULL;
1065
604
}
1066
1067
/* Main loop while running plugins exist */
1068
while(plugin_list){
605
while(process_list){
1069
606
fd_set rfds = rfds_all;
1070
607
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
608
if (select_ret == -1){
1072
609
perror("select");
1073
exitstatus = EX_OSERR;
1074
goto fallback;
610
exitstatus = EXIT_FAILURE;
611
goto end;
1075
612
}
1076
613
/* OK, now either a process completed, or something can be read
1077
614
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
615
for(process *proc = process_list; proc ; proc = proc->next){
1079
616
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
617
if(proc->eof and proc->completed){
1081
618
/* Only accept the plugin output if it exited cleanly */
1082
619
if(not WIFEXITED(proc->status)
1083
620
or WEXITSTATUS(proc->status) != 0){
1084
621
/* Bad exit by plugin */
1085
1086
622
if(debug){
1087
623
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
624
fprintf(stderr, "Plugin %u exited with status %d\n",
625
(unsigned int) (proc->pid),
1091
626
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
627
} else if(WIFSIGNALED(proc->status)) {
628
fprintf(stderr, "Plugin %u killed by signal %d\n",
629
(unsigned int) (proc->pid),
630
WTERMSIG(proc->status));
1098
631
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
632
fprintf(stderr, "Plugin %d dumped core\n",
633
(unsigned int) (proc->pid));
1101
634
}
1102
635
}
1103
1104
636
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
637
FD_CLR(proc->fd, &rfds_all);
1108
638
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
639
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
640
if(ret < 0){
1114
641
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
1116
goto fallback;
1117
}
1118
1119
plugin *next_plugin = proc->next;
1120
free_plugin(proc);
1121
proc = next_plugin;
1122
642
exitstatus = EXIT_FAILURE;
643
goto end;
644
}
645
/* Delete this process entry from the list */
646
if(process_list == proc){
647
/* First one - simple */
648
process_list = proc->next;
649
} else {
650
/* Second one or later */
651
for(process *p = process_list; p != NULL; p = p->next){
652
if(p->next == proc){
653
p->next = proc->next;
654
break;
655
}
656
}
657
}
1123
658
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
659
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
660
NULL);
1127
661
if(ret < 0){
1128
662
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1130
goto fallback;
1131
}
1132
1133
if(plugin_list == NULL){
1134
break;
1135
}
1136
1137
continue;
663
}
664
free(proc->buffer);
665
free(proc);
666
/* We deleted this process from the list, so we can't go
667
proc->next. Therefore, start over from the beginning of
668
the process list */
669
break;
1138
670
}
1139
1140
671
/* This process exited nicely, so print its buffer */
1141
1142
bool bret = print_out_password(proc->buffer,
1143
proc->buffer_length);
672
673
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1144
674
if(not bret){
1145
675
perror("print_out_password");
1146
exitstatus = EX_IOERR;
676
exitstatus = EXIT_FAILURE;
1147
677
}
1148
goto fallback;
678
goto end;
1149
679
}
1150
1151
680
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
681
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
682
/* This process had nothing to say at this time */
1156
proc = proc->next;
1157
683
continue;
1158
684
}
1159
685
/* Before reading, make the process' data buffer large enough */
1160
686
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
687
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
688
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
689
if (proc->buffer == NULL){
1164
690
perror("malloc");
1165
exitstatus = EX_OSERR;
1166
goto fallback;
691
exitstatus = EXIT_FAILURE;
692
goto end;
1167
693
}
1168
694
proc->buffer_size += BUFFER_SIZE;
1169
695
}
1170
696
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
697
ret = read(proc->fd, proc->buffer + proc->buffer_length,
698
BUFFER_SIZE);
699
if(ret < 0){
1176
700
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1178
701
continue;
1179
702
}
1180
if(sret == 0){
703
if(ret == 0){
1181
704
/* got EOF */
1182
705
proc->eof = true;
1183
706
} else {
1184
proc->buffer_length += (size_t) sret;
707
proc->buffer_length += (size_t) ret;
1185
708
}
1186
709
}
1187
710
}
1188
711
1189
1190
fallback:
1191
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1194
/* Fallback if all plugins failed, none are found or an error
1195
occured */
712
if(process_list == NULL){
1196
713
bool bret;
1197
714
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
715
char *passwordbuffer = getpass("Password: ");
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1203
len--;
1204
}
1205
bret = print_out_password(passwordbuffer, len);
716
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1206
717
if(not bret){
1207
718
perror("print_out_password");
1208
exitstatus = EX_IOERR;
719
exitstatus = EXIT_FAILURE;
720
goto end;
1209
721
}
1210
722
}
723
724
end:
1211
725
1212
726
/* Restore old signal handler */
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
if(ret == -1){
1215
perror("sigaction");
1216
exitstatus = EX_OSERR;
1217
}
1218
1219
if(custom_argv != NULL){
1220
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1221
free(*arg);
1222
}
1223
free(custom_argv);
727
sigaction(SIGCHLD, &old_sigchld_action, NULL);
728
729
free(plus_argv);
730
731
/* Free the plugin list */
732
for(plugin *next; plugin_list != NULL; plugin_list = next){
733
next = plugin_list->next;
734
free(plugin_list->argv);
735
free(plugin_list);
1224
736
}
1225
737
1226
738
if(dir != NULL){
1227
739
closedir(dir);
1228
740
}
1229
741
1230
/* Kill the processes */
1231
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
if(p->pid != 0){
1233
close(p->fd);
1234
ret = kill(p->pid, SIGTERM);
1235
if(ret == -1 and errno != ESRCH){
1236
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1238
}
742
/* Free the process list and kill the processes */
743
for(process *next; process_list != NULL; process_list = next){
744
next = process_list->next;
745
close(process_list->fd);
746
ret = kill(process_list->pid, SIGTERM);
747
if(ret == -1 and errno != ESRCH){
748
/* set-uid proccesses migth not get closed */
749
perror("kill");
1239
750
}
751
free(process_list->buffer);
752
free(process_list);
1240
753
}
1241
754
1242
755
/* Wait for any remaining child processes to terminate */
1243
do {
756
do{
1244
757
ret = wait(NULL);
1245
758
} while(ret >= 0);
1246
759
if(errno != ECHILD){
1247
760
perror("wait");
1248
761
}
1249
762
1250
free_plugin_list();
1251
1252
free(plugindir);
1253
free(argfile);
1254
1255
763
return exitstatus;
1256
764
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0