19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
30
#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
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
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(),
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
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(),
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
54
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
52
FD_CLOEXEC, openat(), scandirat(),
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
70
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
74
75
#define BUFFER_SIZE 256
76
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
77
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
79
81
const char *argp_program_version = "plugin-runner " VERSION;
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
82
84
typedef struct plugin{
83
85
char *name; /* can be NULL or any plugin name */
486
511
plugin *p = getplugin(arg);
488
513
p->disabled = false;
492
518
case 128: /* --plugin-dir */
494
520
plugindir = strdup(arg);
521
if(plugindir != NULL){
496
525
case 129: /* --config-file */
497
526
/* This is already done by parse_opt_config_file() */
499
528
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
529
tmp_id = strtoimax(arg, &tmp, 10);
501
530
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
531
or tmp_id != (uid_t)tmp_id){
503
532
argp_error(state, "Bad user ID number: \"%s\", using %"
504
533
PRIdMAX, arg, (intmax_t)uid);
509
539
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
540
tmp_id = strtoimax(arg, &tmp, 10);
511
541
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
542
or tmp_id != (gid_t)tmp_id){
513
543
argp_error(state, "Bad group ID number: \"%s\", using %"
514
544
PRIdMAX, arg, (intmax_t)gid);
519
550
case 132: /* --debug */
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
523
561
* These reproduce what we would get without ARGP_NO_HELP
777
char *pluginhelperenv;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
free(pluginhelperenv);
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
795
for(plugin *p = plugin_list; p != NULL; p = p->next){
731
796
fprintf(stderr, "Plugin: %s has %d arguments\n",
732
797
p->name ? p->name : "Global", p->argc - 1);
733
798
for(char **a = p->argv; *a != NULL; a++){
743
/* Strip permissions down to nobody */
809
/* Work around Debian bug #633582:
810
<https://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
814
error(0, errno, "open(\"" PDIR "\")");
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
error(0, errno, "fstat");
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
824
error(0, errno, "fchown");
832
/* Lower permissions */
835
error(0, errno, "setgid");
748
837
ret = setuid(uid);
839
error(0, errno, "setuid");
753
842
/* Open plugin directory with close_on_exec flag */
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
760
#else /* not O_CLOEXEC */
762
#endif /* not O_CLOEXEC */
765
dir_fd = open(plugindir, O_RDONLY |
768
#else /* not O_CLOEXEC */
770
#endif /* not O_CLOEXEC */
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#else /* not O_CLOEXEC */
849
#endif /* not O_CLOEXEC */
773
851
if(dir_fd == -1){
774
perror("Could not open plugin dir");
852
error(0, errno, "Could not open plugin dir");
775
853
exitstatus = EX_UNAVAILABLE;
780
858
/* Set the FD_CLOEXEC flag on the directory */
781
859
ret = set_cloexec_flag(dir_fd);
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
861
error(0, errno, "set_cloexec_flag");
785
862
exitstatus = EX_OSERR;
788
865
#endif /* O_CLOEXEC */
790
dir = fdopendir(dir_fd);
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
879
#pragma GCC diagnostic pop
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
898
exitstatus = EX_OSERR;
799
902
FD_ZERO(&rfds_all);
801
904
/* Read and execute any executable in the plugin directory*/
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
807
/* All directory entries have been processed */
811
exitstatus = EX_IOERR;
817
d_name_len = strlen(dirst->d_name);
819
/* Ignore dotfiles, backup files and other junk */
821
bool bad_name = false;
823
const char const *bad_prefixes[] = { ".", "#", NULL };
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
828
".dpkg-divert", NULL };
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
size_t pre_len = strlen(*pre);
831
if((d_name_len >= pre_len)
832
and strncmp((dirst->d_name), *pre, pre_len) == 0){
834
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
835
" with bad prefix %s\n", dirst->d_name, *pre);
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
size_t suf_len = strlen(*suf);
846
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
851
" with bad suffix %s\n", dirst->d_name, *suf);
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
905
for(int i = 0; i < numplugins; i++){
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
error(0, errno, "Could not open plugin");
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
error(0, errno, "stat");
884
921
/* Ignore non-executable files */
885
922
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
895
plugin *p = getplugin(dirst->d_name);
936
plugin *p = getplugin(direntries[i]->d_name);
938
error(0, errno, "getplugin");
903
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
913
956
for(char **a = g->argv + 1; *a != NULL; a++){
914
957
if(not add_argument(p, *a)){
915
perror("add_argument");
958
error(0, errno, "add_argument");
918
961
/* Add global environment variables */
919
962
for(char **e = g->environ; *e != NULL; e++){
920
963
if(not add_environment(p, *e, false)){
921
perror("add_environment");
964
error(0, errno, "add_environment");
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
929
971
if(p->environ[0] != NULL){
930
972
for(char **e = environ; *e != NULL; e++){
931
973
if(not add_environment(p, *e, false)){
932
perror("add_environment");
974
error(0, errno, "add_environment");
938
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
941
exitstatus = EX_OSERR;
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
996
exitstatus = EX_OSERR;
944
1001
/* Ask OS to automatic close the pipe on exec */
945
1002
ret = set_cloexec_flag(pipefd[0]);
947
perror("set_cloexec_flag");
1004
error(0, errno, "set_cloexec_flag");
948
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
951
1011
ret = set_cloexec_flag(pipefd[1]);
953
perror("set_cloexec_flag");
1013
error(0, errno, "set_cloexec_flag");
954
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1020
#endif /* not O_CLOEXEC */
957
1021
/* Block SIGCHLD until process is safely in process list */
958
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
1023
&sigchld_action.sa_mask,
962
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
963
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
966
1031
/* Starting a new process to be watched */
970
1035
} while(pid == -1 and errno == EINTR);
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
973
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
977
1047
/* this is the child process */
978
1048
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1050
error(0, errno, "sigaction");
981
1051
_exit(EX_OSERR);
983
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
985
perror("sigprocmask");
1055
error(0, errno, "sigprocmask");
986
1056
_exit(EX_OSERR);
989
1059
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1061
error(0, errno, "dup2");
992
1062
_exit(EX_OSERR);
996
/* If dir has no file descriptor, we could not set FD_CLOEXEC
997
above and must now close it manually here. */
1000
if(p->environ[0] == NULL){
1001
if(execv(filename, p->argv) < 0){
1006
if(execve(filename, p->argv, p->environ) < 0){
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1011
1072
/* no return */
1013
1074
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
plugin *new_plugin = getplugin(dirst->d_name);
1075
close(pipefd[1]); /* Close unused write end of pipe */
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1018
1078
if(new_plugin == NULL){
1019
perror("getplugin");
1079
error(0, errno, "getplugin");
1020
1080
ret = (int)(TEMP_FAILURE_RETRY
1021
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
perror("sigprocmask");
1084
error(0, errno, "sigprocmask");
1026
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
1090
free(direntries[i]);
1030
1092
new_plugin->pid = pid;
1031
1093
new_plugin->fd = pipefd[0];
1142
1201
bool bret = print_out_password(proc->buffer,
1143
1202
proc->buffer_length);
1145
perror("print_out_password");
1204
error(0, errno, "print_out_password");
1146
1205
exitstatus = EX_IOERR;
1151
1210
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1212
/* This process had nothing to say at this time */
1156
1213
proc = proc->next;
1159
1216
/* Before reading, make the process' data buffer large enough */
1160
1217
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1165
1222
exitstatus = EX_OSERR;
1225
proc->buffer = new_buffer;
1168
1226
proc->buffer_size += BUFFER_SIZE;
1170
1228
/* Read from the process */