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- Committer: Teddy Hogeborn
- Date: 2012-01-01 20:45:53 UTC
- Revision ID: teddy@recompile.se-20120101204553-f1zlty873gswtf5n
* README: Hint that the intro(8mandos) manual page is in the server
package.
package.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
41
WEXITSTATUS(), WTERMSIG(),
42
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
72
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
73
#include <errno.h> /* errno */
74
74
#include <error.h> /* error() */
75
#include <fnmatch.h> /* fnmatch() */
76
75
77
76
#define BUFFER_SIZE 256
78
77
106
105
107
106
/* Gets an existing plugin based on name,
108
107
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
108
static plugin *getplugin(char *name){
111
109
/* Check for existing plugin with that name */
112
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
173
171
}
174
172
175
173
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
174
__attribute__((nonnull))
177
175
static bool add_to_char_array(const char *new, char ***array,
178
176
int *len){
179
177
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
178
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
185
182
/* Malloc check */
186
if(new_array == NULL){
183
if(*array == NULL){
187
184
return false;
188
185
}
189
*array = new_array;
190
186
/* Make a copy of the new string */
191
187
char *copy;
192
188
do {
204
200
}
205
201
206
202
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
203
__attribute__((nonnull(2)))
208
204
static bool add_argument(plugin *p, const char *arg){
209
205
if(p == NULL){
210
206
return false;
213
209
}
214
210
215
211
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
212
__attribute__((nonnull(2)))
217
213
static bool add_environment(plugin *p, const char *def, bool replace){
218
214
if(p == NULL){
219
215
return false;
221
217
/* namelen = length of name of environment variable */
222
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
219
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
226
222
/* It already exists */
227
223
if(replace){
228
char *new_envdef;
224
char *new;
229
225
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
233
229
return false;
234
230
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
231
*e = new;
232
strcpy(*e, def);
237
233
}
238
234
return true;
239
235
}
246
242
* Descriptor Flags".
247
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
248
244
*/
249
__attribute__((warn_unused_result))
250
245
static int set_cloexec_flag(int fd){
251
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
247
/* If reading the flags failed, return error indication now. */
294
289
}
295
290
296
291
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
292
__attribute__((nonnull))
298
293
static bool print_out_password(const char *buffer, size_t length){
299
294
ssize_t ret;
300
295
for(size_t written = 0; written < length; written += (size_t)ret){
348
343
char *plugindir = NULL;
349
344
char *argfile = NULL;
350
345
FILE *conffp;
346
size_t d_name_len;
351
347
DIR *dir = NULL;
352
348
struct dirent *dirst;
353
349
struct stat st;
363
359
.sa_flags = SA_NOCLDSTOP };
364
360
char **custom_argv = NULL;
365
361
int custom_argc = 0;
366
int dir_fd;
367
362
368
363
/* Establish a signal handler */
369
364
sigemptyset(&sigchld_action.sa_mask);
440
435
break;
441
436
}
442
437
}
443
errno = 0;
444
438
}
445
439
break;
446
440
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
441
add_environment(getplugin(NULL), arg, true);
450
442
break;
451
443
case 'o': /* --options-for */
452
444
{
469
461
break;
470
462
}
471
463
}
472
errno = 0;
473
464
}
474
465
break;
475
466
case 'E': /* --env-for */
487
478
errno = EINVAL;
488
479
break;
489
480
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
481
add_environment(getplugin(arg), envdef, true);
493
482
}
494
483
break;
495
484
case 'd': /* --disable */
497
486
plugin *p = getplugin(arg);
498
487
if(p != NULL){
499
488
p->disabled = true;
500
errno = 0;
501
489
}
502
490
}
503
491
break;
506
494
plugin *p = getplugin(arg);
507
495
if(p != NULL){
508
496
p->disabled = false;
509
errno = 0;
510
497
}
511
498
}
512
499
break;
513
500
case 128: /* --plugin-dir */
514
501
free(plugindir);
515
502
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
503
break;
520
504
case 129: /* --config-file */
521
505
/* This is already done by parse_opt_config_file() */
529
513
break;
530
514
}
531
515
uid = (uid_t)tmp_id;
532
errno = 0;
533
516
break;
534
517
case 131: /* --groupid */
535
518
tmp_id = strtoimax(arg, &tmp, 10);
540
523
break;
541
524
}
542
525
gid = (gid_t)tmp_id;
543
errno = 0;
544
526
break;
545
527
case 132: /* --debug */
546
528
debug = true;
594
576
case 129: /* --config-file */
595
577
free(argfile);
596
578
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
579
break;
601
580
case 130: /* --userid */
602
581
case 131: /* --groupid */
685
664
}
686
665
687
666
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
667
custom_argv = realloc(custom_argv, sizeof(char *)
668
* ((unsigned int) custom_argc + 1));
669
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
672
free(org_line);
673
goto fallback;
701
674
}
702
675
custom_argv[custom_argc-1] = new_arg;
703
676
custom_argv[custom_argc] = NULL;
780
753
<http://bugs.debian.org/633582> */
781
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
755
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
756
error(0, errno, "open");
786
757
} else {
787
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
759
if(ret == -1){
800
771
}
801
772
802
773
/* Lower permissions */
803
ret = setgid(gid);
774
setgid(gid);
804
775
if(ret == -1){
805
776
error(0, errno, "setgid");
806
777
}
811
782
812
783
/* Open plugin directory with close_on_exec flag */
813
784
{
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
821
803
if(dir_fd == -1){
822
804
error(0, errno, "Could not open plugin dir");
823
805
exitstatus = EX_UNAVAILABLE;
862
844
break;
863
845
}
864
846
847
d_name_len = strlen(dirst->d_name);
848
865
849
/* Ignore dotfiles, backup files and other junk */
866
850
{
867
851
bool bad_name = false;
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
871
NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
886
}
887
bad_name = true;
888
break;
889
}
890
}
852
853
const char const *bad_prefixes[] = { ".", "#", NULL };
854
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
856
".dpkg-old",
857
".dpkg-bak",
858
".dpkg-divert", NULL };
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
860
size_t pre_len = strlen(*pre);
861
if((d_name_len >= pre_len)
862
and strncmp((dirst->d_name), *pre, pre_len) == 0){
863
if(debug){
864
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
865
" with bad prefix %s\n", dirst->d_name, *pre);
866
}
867
bad_name = true;
868
break;
869
}
870
}
871
if(bad_name){
872
continue;
873
}
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
size_t suf_len = strlen(*suf);
876
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
878
== 0)){
879
if(debug){
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
881
" with bad suffix %s\n", dirst->d_name, *suf);
882
}
883
bad_name = true;
884
break;
885
}
886
}
887
891
888
if(bad_name){
892
889
continue;
893
890
}
894
891
}
895
892
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
897
#ifdef O_CLOEXEC
898
O_CLOEXEC
899
#else /* not O_CLOEXEC */
900
0
901
#endif /* not O_CLOEXEC */
902
);
903
if(plugin_fd == -1){
904
error(0, errno, "Could not open plugin");
905
continue;
893
char *filename;
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
897
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
906
901
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
910
902
if(ret < 0){
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
903
error(0, errno, "asprintf");
913
904
continue;
914
905
}
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
906
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
917
908
if(ret == -1){
918
909
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
910
free(filename);
920
911
continue;
921
912
}
922
913
923
914
/* Ignore non-executable files */
924
915
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
927
917
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
" with bad type or mode\n", filename);
931
920
}
932
TEMP_FAILURE_RETRY(close(plugin_fd));
921
free(filename);
933
922
continue;
934
923
}
935
924
936
925
plugin *p = getplugin(dirst->d_name);
937
926
if(p == NULL){
938
927
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
928
free(filename);
940
929
continue;
941
930
}
942
931
if(p->disabled){
944
933
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
945
934
dirst->d_name);
946
935
}
947
TEMP_FAILURE_RETRY(close(plugin_fd));
936
free(filename);
948
937
continue;
949
938
}
950
939
{
964
953
}
965
954
}
966
955
}
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
956
/* If this plugin has any environment variables, we will call
957
using execve and need to duplicate the environment from this
958
process, too. */
969
959
if(p->environ[0] != NULL){
970
960
for(char **e = environ; *e != NULL; e++){
971
961
if(not add_environment(p, *e, false)){
1037
1027
above and must now close it manually here. */
1038
1028
closedir(dir);
1039
1029
}
1040
if(fexecve(plugin_fd, p->argv,
1041
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1042
error(0, errno, "fexecve for %s/%s",
1043
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1044
_exit(EX_OSERR);
1030
if(p->environ[0] == NULL){
1031
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
1034
}
1035
} else {
1036
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
1039
}
1045
1040
}
1046
1041
/* no return */
1047
1042
}
1048
1043
/* Parent process */
1049
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1050
1045
pipe */
1051
TEMP_FAILURE_RETRY(close(plugin_fd));
1046
free(filename);
1052
1047
plugin *new_plugin = getplugin(dirst->d_name);
1053
1048
if(new_plugin == NULL){
1054
1049
error(0, errno, "getplugin");
1076
1071
goto fallback;
1077
1072
}
1078
1073
1079
#if defined (__GNUC__) and defined (__GLIBC__)
1080
#if not __GLIBC_PREREQ(2, 16)
1081
#pragma GCC diagnostic push
1082
#pragma GCC diagnostic ignored "-Wsign-conversion"
1083
#endif
1084
#endif
1085
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1086
-Wconversion in GNU libc
1087
before 2.16 */
1088
#if defined (__GNUC__) and defined (__GLIBC__)
1089
#if not __GLIBC_PREREQ(2, 16)
1090
#pragma GCC diagnostic pop
1091
#endif
1092
#endif
1075
-Wconversion */
1093
1076
1094
1077
if(maxfd < new_plugin->fd){
1095
1078
maxfd = new_plugin->fd;
1149
1132
}
1150
1133
1151
1134
/* Remove the plugin */
1152
#if defined (__GNUC__) and defined (__GLIBC__)
1153
#if not __GLIBC_PREREQ(2, 16)
1154
#pragma GCC diagnostic push
1155
#pragma GCC diagnostic ignored "-Wsign-conversion"
1156
#endif
1157
#endif
1158
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1159
-Wconversion in GNU libc
1160
before 2.16 */
1161
#if defined (__GNUC__) and defined (__GLIBC__)
1162
#if not __GLIBC_PREREQ(2, 16)
1163
#pragma GCC diagnostic pop
1164
#endif
1165
#endif
1136
-Wconversion */
1166
1137
1167
1138
/* Block signal while modifying process_list */
1168
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1208
1179
}
1209
1180
1210
1181
/* This process has not completed. Does it have any output? */
1211
#if defined (__GNUC__) and defined (__GLIBC__)
1212
#if not __GLIBC_PREREQ(2, 16)
1213
#pragma GCC diagnostic push
1214
#pragma GCC diagnostic ignored "-Wsign-conversion"
1215
#endif
1216
#endif
1217
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1218
1183
warning from
1219
-Wconversion
1220
in GNU libc
1221
before
1222
2.16 */
1223
#if defined (__GNUC__) and defined (__GLIBC__)
1224
#if not __GLIBC_PREREQ(2, 16)
1225
#pragma GCC diagnostic pop
1226
#endif
1227
#endif
1184
-Wconversion */
1228
1185
/* This process had nothing to say at this time */
1229
1186
proc = proc->next;
1230
1187
continue;
1231
1188
}
1232
1189
/* Before reading, make the process' data buffer large enough */
1233
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1234
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1235
+ (size_t) BUFFER_SIZE);
1236
if(new_buffer == NULL){
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1237
1194
error(0, errno, "malloc");
1238
1195
exitstatus = EX_OSERR;
1239
1196
goto fallback;
1240
1197
}
1241
proc->buffer = new_buffer;
1242
1198
proc->buffer_size += BUFFER_SIZE;
1243
1199
}
1244
1200
/* Read from the process */
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0