2 * Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file command.c Client authentication and server commands. */
9 #include <netinet/in.h>
10 #include <sys/socket.h>
13 #include <sys/types.h>
15 #include <arpa/inet.h>
24 #include "server.cmdline.h"
37 #include "user_list.h"
38 #include "server.command_list.h"
39 #include "afs.command_list.h"
43 typedef int server_command_handler_t(struct command_context *);
44 static server_command_handler_t SERVER_COMMAND_HANDLERS;
45 server_command_handler_t AFS_COMMAND_HANDLERS;
47 /* Defines one command of para_server. */
48 struct server_command {
49 /* The name of the command. */
51 /* Pointer to the function that handles the command. */
52 server_command_handler_t *handler;
53 /* The privileges a user must have to execute this command. */
55 /* One-line description of the command. */
56 const char *description;
57 /* Summary of the command line options. */
59 /* The long help text. */
63 static struct server_command afs_cmds[] = {DEFINE_AFS_CMD_ARRAY};
64 static struct server_command server_cmds[] = {DEFINE_SERVER_CMD_ARRAY};
66 /** Commands including options must be shorter than this. */
67 #define MAX_COMMAND_LEN 32768
70 extern struct misc_meta_data *mmd;
71 extern struct sender senders[];
72 int send_afs_status(struct command_context *cc, int parser_friendly);
74 static void dummy(__a_unused int s)
78 static void mmd_dup(struct misc_meta_data *new_mmd)
80 mutex_lock(mmd_mutex);
82 mutex_unlock(mmd_mutex);
86 * Compute human readable vss status text.
88 * We can't call vss_playing() and friends here because those functions read
89 * the flags from the primary mmd structure, so calling them from command
90 * handler context would require to take the mmd lock. At the time the function
91 * is called we already took a copy of the mmd structure and want to use the
92 * flags value of the copy for computing the vss status text.
94 static char *vss_status_tohuman(unsigned int flags)
96 if (flags & VSS_PLAYING)
97 return para_strdup("playing");
99 return para_strdup("stopped");
100 return para_strdup("paused");
104 * return human readable permission string. Never returns NULL.
106 static char *cmd_perms_itohuman(unsigned int perms)
108 char *msg = para_malloc(5 * sizeof(char));
110 msg[0] = perms & AFS_READ? 'a' : '-';
111 msg[1] = perms & AFS_WRITE? 'A' : '-';
112 msg[2] = perms & VSS_READ? 'v' : '-';
113 msg[3] = perms & VSS_WRITE? 'V' : '-';
119 * Never returns NULL.
121 static char *vss_get_status_flags(unsigned int flags)
123 char *msg = para_malloc(5 * sizeof(char));
125 msg[0] = (flags & VSS_PLAYING)? 'P' : '_';
126 msg[1] = (flags & VSS_NOMORE)? 'O' : '_';
127 msg[2] = (flags & VSS_NEXT)? 'N' : '_';
128 msg[3] = (flags & VSS_REPOS)? 'R' : '_';
133 static unsigned get_status(struct misc_meta_data *nmmd, int parser_friendly,
136 char *status, *flags; /* vss status info */
137 /* nobody updates our version of "now" */
138 long offset = (nmmd->offset + 500) / 1000;
139 struct timeval current_time;
140 struct para_buffer b = {.flags = parser_friendly? PBF_SIZE_PREFIX : 0};
142 /* report real status */
143 status = vss_status_tohuman(nmmd->vss_status_flags);
144 flags = vss_get_status_flags(nmmd->vss_status_flags);
145 clock_get_realtime(¤t_time);
147 * The calls to WRITE_STATUS_ITEM() below never fail because
148 * b->max_size is zero (unlimited), see para_printf(). However, clang
149 * is not smart enough to prove this and complains nevertheless.
150 * Casting the return value to void silences clang.
152 (void)WRITE_STATUS_ITEM(&b, SI_STATUS, "%s\n", status);
153 (void)WRITE_STATUS_ITEM(&b, SI_STATUS_FLAGS, "%s\n", flags);
154 (void)WRITE_STATUS_ITEM(&b, SI_OFFSET, "%li\n", offset);
155 (void)WRITE_STATUS_ITEM(&b, SI_AFS_MODE, "%s\n", mmd->afs_mode_string);
156 (void)WRITE_STATUS_ITEM(&b, SI_STREAM_START, "%lu.%lu\n",
157 (long unsigned)nmmd->stream_start.tv_sec,
158 (long unsigned)nmmd->stream_start.tv_usec);
159 (void)WRITE_STATUS_ITEM(&b, SI_CURRENT_TIME, "%lu.%lu\n",
160 (long unsigned)current_time.tv_sec,
161 (long unsigned)current_time.tv_usec);
168 static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd)
171 /* this has to match sender.h */
172 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
174 scd->sender_num = -1;
176 return -E_COMMAND_SYNTAX;
177 for (i = 0; senders[i].name; i++)
178 if (!strcmp(senders[i].name, argv[1]))
180 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
181 if (!senders[i].name)
182 return -E_COMMAND_SYNTAX;
184 for (i = 0; subcmds[i]; i++)
185 if (!strcmp(subcmds[i], argv[2]))
188 return -E_COMMAND_SYNTAX;
190 if (!senders[scd->sender_num].client_cmds[scd->cmd_num])
191 return -E_SENDER_CMD;
192 switch (scd->cmd_num) {
196 return -E_COMMAND_SYNTAX;
200 if (argc != 4 || parse_cidr(argv[3], scd->host,
201 sizeof(scd->host), &scd->netmask) == NULL)
202 return -E_COMMAND_SYNTAX;
207 return -E_COMMAND_SYNTAX;
208 return parse_fec_url(argv[3], scd);
210 return -E_COMMAND_SYNTAX;
216 * Send a sideband packet through a blocking file descriptor.
218 * \param scc fd and crypto keys.
219 * \param buf The buffer to send.
220 * \param numbytes The size of \a buf.
221 * \param band The sideband designator of this packet.
222 * \param dont_free If true, never deallocate \a buf.
224 * The nonblock flag must be disabled for the file descriptor given by \a scc.
226 * Stream cipher encryption is automatically activated if necessary via the
227 * sideband transformation, depending on the value of \a band.
231 * \sa \ref send_sb_va().
233 int send_sb(struct stream_cipher_context *scc, void *buf, size_t numbytes,
234 int band, bool dont_free)
237 struct sb_context *sbc;
239 sb_transformation trafo = band < SBD_PROCEED? NULL : sc_trafo;
240 struct sb_buffer sbb = SBB_INIT(band, buf, numbytes);
242 sbc = sb_new_send(&sbb, dont_free, trafo, scc->send);
244 ret = sb_get_send_buffers(sbc, iov);
245 ret = xwritev(scc->fd, iov, ret);
248 } while (sb_sent(sbc, ret) == false);
256 * Create a variable sized buffer and send it as a sideband packet.
258 * \param scc Passed to \ref send_sb.
259 * \param band See \ref send_sb.
260 * \param fmt The format string.
262 * \return The return value of the underlying call to \ref send_sb.
264 __printf_3_4 int send_sb_va(struct stream_cipher_context *scc, int band,
265 const char *fmt, ...)
272 ret = xvasprintf(&msg, fmt, ap);
274 return send_sb(scc, msg, ret, band, false);
278 * Send an error message to a client.
280 * \param cc Client info.
281 * \param err The (positive) error code.
283 * \return The return value of the underlying call to send_sb_va().
285 int send_strerror(struct command_context *cc, int err)
287 return send_sb_va(&cc->scc, SBD_ERROR_LOG, "%s\n", para_strerror(err));
291 * Send a sideband packet through a blocking file descriptor.
293 * \param scc fd and crypto keys.
294 * \param expected_band The expected band designator.
295 * \param max_size Passed to \ref sb_new_recv().
296 * \param result Body of the sideband packet is returned here.
298 * If \a expected_band is not \p SBD_ANY, the band designator of the received
299 * sideband packet is compared to \a expected_band and a mismatch is considered
304 int recv_sb(struct stream_cipher_context *scc,
305 enum sb_designator expected_band,
306 size_t max_size, struct iovec *result)
309 struct sb_context *sbc;
311 struct sb_buffer sbb;
312 sb_transformation trafo;
314 trafo = expected_band != SBD_ANY && expected_band < SBD_PROCEED?
316 sbc = sb_new_recv(max_size, trafo, scc->recv);
318 sb_get_recv_buffer(sbc, &iov);
319 ret = recv_bin_buffer(scc->fd, iov.iov_base, iov.iov_len);
324 ret = sb_received(sbc, ret, &sbb);
331 if (expected_band != SBD_ANY && sbb.band != expected_band)
340 static int com_sender(struct command_context *cc)
344 struct sender_command_data scd;
347 for (i = 0; senders[i].name; i++) {
349 ret = xasprintf(&tmp, "%s%s\n", msg? msg : "",
354 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
356 ret = check_sender_args(cc->argc, cc->argv, &scd);
358 if (scd.sender_num < 0)
360 if (strcmp(cc->argv[2], "status") == 0)
361 msg = senders[scd.sender_num].status();
363 msg = senders[scd.sender_num].help();
364 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
367 switch (scd.cmd_num) {
370 assert(senders[scd.sender_num].resolve_target);
371 ret = senders[scd.sender_num].resolve_target(cc->argv[3], &scd);
376 for (i = 0; i < 10; i++) {
377 mutex_lock(mmd_mutex);
378 if (mmd->sender_cmd_data.cmd_num >= 0) {
379 /* another sender command is active, retry in 100ms */
380 struct timespec ts = {.tv_nsec = 100 * 1000 * 1000};
381 mutex_unlock(mmd_mutex);
382 nanosleep(&ts, NULL);
385 mmd->sender_cmd_data = scd;
386 mutex_unlock(mmd_mutex);
389 return (i < 10)? 1 : -E_LOCK;
393 static int com_si(struct command_context *cc)
399 return -E_COMMAND_SYNTAX;
400 mutex_lock(mmd_mutex);
401 ut = daemon_get_uptime_str(now);
402 ret = xasprintf(&msg,
403 "up: %s\nplayed: %u\n"
406 "connections (active/accepted/total): %u/%u/%u\n"
407 "current loglevel: %s\n"
408 "supported audio formats: %s\n",
412 mmd->active_connections,
416 AUDIO_FORMAT_HANDLERS
418 mutex_unlock(mmd_mutex);
420 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
424 static int com_version(struct command_context *cc)
429 if (cc->argc > 1 && strcmp(cc->argv[1], "-v") == 0)
430 len = xasprintf(&msg, "%s", version_text("server"));
432 len = xasprintf(&msg, "%s\n", version_single_line("server"));
433 return send_sb(&cc->scc, msg, len, SBD_OUTPUT, false);
436 /** These status items are cleared if no audio file is currently open. */
437 #define EMPTY_STATUS_ITEMS \
442 ITEM(ATTRIBUTES_BITMAP) \
443 ITEM(ATTRIBUTES_TXT) \
454 ITEM(SECONDS_TOTAL) \
467 ITEM(AMPLIFICATION) \
470 * Write a list of audio-file related status items with empty values.
472 * This is used by vss when currently no audio file is open.
474 static unsigned empty_status_items(int parser_friendly, char **result)
480 len = xasprintf(&esi,
481 #define ITEM(x) "0004 %02x:\n"
484 #define ITEM(x) , SI_ ## x
489 len = xasprintf(&esi,
490 #define ITEM(x) "%s:\n"
493 #define ITEM(x) ,status_item_list[SI_ ## x]
500 #undef EMPTY_STATUS_ITEMS
503 static int com_stat(struct command_context *cc)
506 struct misc_meta_data tmp, *nmmd = &tmp;
509 int parser_friendly = 0;
511 para_sigaction(SIGUSR1, dummy);
513 for (i = 1; i < cc->argc; i++) {
514 const char *arg = cc->argv[i];
517 if (!strcmp(arg, "--")) {
521 if (!strncmp(arg, "-n=", 3)) {
522 ret = para_atoi32(arg + 3, &num);
527 if (!strcmp(arg, "-p")) {
531 return -E_COMMAND_SYNTAX;
534 return -E_COMMAND_SYNTAX;
537 ret = get_status(nmmd, parser_friendly, &s);
538 ret = send_sb(&cc->scc, s, ret, SBD_OUTPUT, false);
541 if (nmmd->vss_status_flags & VSS_NEXT) {
543 ret = empty_status_items(parser_friendly, &esi);
544 ret = send_sb(&cc->scc, esi, ret, SBD_OUTPUT, false);
548 send_afs_status(cc, parser_friendly);
550 if (num > 0 && !--num)
553 ret = -E_SERVER_CRASH;
561 static int send_list_of_commands(struct command_context *cc, struct server_command *cmd,
566 for (; cmd->name; cmd++) {
567 char *tmp, *perms = cmd_perms_itohuman(cmd->perms);
568 tmp = make_message("%s\t%s\t%s\t%s\n", cmd->name, handler,
569 perms, cmd->description);
571 msg = para_strcat(msg, tmp);
575 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
578 /* returns string that must be freed by the caller */
579 static struct server_command *get_cmd_ptr(const char *name, char **handler)
581 struct server_command *cmd;
583 for (cmd = server_cmds; cmd->name; cmd++)
584 if (!strcmp(cmd->name, name)) {
586 *handler = para_strdup("server"); /* server commands */
589 /* not found, look for commands supported by afs */
590 for (cmd = afs_cmds; cmd->name; cmd++)
591 if (!strcmp(cmd->name, name)) {
593 *handler = para_strdup("afs");
600 static int com_help(struct command_context *cc)
602 struct server_command *cmd;
603 char *perms, *handler, *buf;
607 /* no argument given, print list of commands */
608 if ((ret = send_list_of_commands(cc, server_cmds, "server")) < 0)
610 return send_list_of_commands(cc, afs_cmds, "afs");
612 /* argument given for help */
613 cmd = get_cmd_ptr(cc->argv[1], &handler);
616 perms = cmd_perms_itohuman(cmd->perms);
617 ret = xasprintf(&buf, "%s - %s\n\n"
631 return send_sb(&cc->scc, buf, ret, SBD_OUTPUT, false);
635 static int com_hup(struct command_context *cc)
638 return -E_COMMAND_SYNTAX;
639 kill(getppid(), SIGHUP);
644 static int com_term(struct command_context *cc)
647 return -E_COMMAND_SYNTAX;
648 kill(getppid(), SIGTERM);
652 static int com_play(struct command_context *cc)
655 return -E_COMMAND_SYNTAX;
656 mutex_lock(mmd_mutex);
657 mmd->new_vss_status_flags |= VSS_PLAYING;
658 mmd->new_vss_status_flags &= ~VSS_NOMORE;
659 mutex_unlock(mmd_mutex);
664 static int com_stop(struct command_context *cc)
667 return -E_COMMAND_SYNTAX;
668 mutex_lock(mmd_mutex);
669 mmd->new_vss_status_flags &= ~VSS_PLAYING;
670 mmd->new_vss_status_flags &= ~VSS_REPOS;
671 mmd->new_vss_status_flags |= VSS_NEXT;
672 mutex_unlock(mmd_mutex);
677 static int com_pause(struct command_context *cc)
680 return -E_COMMAND_SYNTAX;
681 mutex_lock(mmd_mutex);
682 if (!vss_paused() && !vss_stopped()) {
684 mmd->new_vss_status_flags &= ~VSS_PLAYING;
685 mmd->new_vss_status_flags &= ~VSS_NEXT;
687 mutex_unlock(mmd_mutex);
692 static int com_next(struct command_context *cc)
695 return -E_COMMAND_SYNTAX;
696 mutex_lock(mmd_mutex);
698 mmd->new_vss_status_flags |= VSS_NEXT;
699 mutex_unlock(mmd_mutex);
704 static int com_nomore(struct command_context *cc)
707 return -E_COMMAND_SYNTAX;
708 mutex_lock(mmd_mutex);
709 if (vss_playing() || vss_paused())
710 mmd->new_vss_status_flags |= VSS_NOMORE;
711 mutex_unlock(mmd_mutex);
716 static int com_ff(struct command_context *cc)
719 int ret, backwards = 0;
724 return -E_COMMAND_SYNTAX;
725 if (!(ret = sscanf(cc->argv[1], "%u%c", &i, &c)))
726 return -E_COMMAND_SYNTAX;
727 if (ret > 1 && c == '-')
728 backwards = 1; /* jmp backwards */
729 mutex_lock(mmd_mutex);
730 ret = -E_NO_AUDIO_FILE;
731 if (!mmd->afd.afhi.chunks_total || !mmd->afd.afhi.seconds_total)
733 promille = (1000 * mmd->current_chunk) / mmd->afd.afhi.chunks_total;
735 promille -= 1000 * i / mmd->afd.afhi.seconds_total;
737 promille += 1000 * i / mmd->afd.afhi.seconds_total;
740 if (promille > 1000) {
741 mmd->new_vss_status_flags |= VSS_NEXT;
744 mmd->repos_request = (mmd->afd.afhi.chunks_total * promille) / 1000;
745 mmd->new_vss_status_flags |= VSS_REPOS;
746 mmd->new_vss_status_flags &= ~VSS_NEXT;
750 mutex_unlock(mmd_mutex);
755 static int com_jmp(struct command_context *cc)
761 return -E_COMMAND_SYNTAX;
762 if (sscanf(cc->argv[1], "%lu", &i) <= 0)
763 return -E_COMMAND_SYNTAX;
764 mutex_lock(mmd_mutex);
765 ret = -E_NO_AUDIO_FILE;
766 if (!mmd->afd.afhi.chunks_total)
770 PARA_INFO_LOG("jumping to %lu%%\n", i);
771 mmd->repos_request = (mmd->afd.afhi.chunks_total * i + 50) / 100;
772 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
773 mmd->chunks_sent, mmd->offset);
774 mmd->new_vss_status_flags |= VSS_REPOS;
775 mmd->new_vss_status_flags &= ~VSS_NEXT;
779 mutex_unlock(mmd_mutex);
783 static int com_tasks(struct command_context *cc)
785 char *tl = server_get_tasks();
789 ret = send_sb(&cc->scc, tl, strlen(tl), SBD_OUTPUT, false);
794 * check if perms are sufficient to exec a command having perms cmd_perms.
795 * Returns 0 if perms are sufficient, -E_PERM otherwise.
797 static int check_perms(unsigned int perms, const struct server_command *cmd_ptr)
799 PARA_DEBUG_LOG("checking permissions\n");
800 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
803 static void reset_signals(void)
805 para_sigaction(SIGCHLD, SIG_IGN);
806 para_sigaction(SIGINT, SIG_DFL);
807 para_sigaction(SIGTERM, SIG_DFL);
808 para_sigaction(SIGHUP, SIG_DFL);
811 struct connection_features {
812 bool sideband_requested;
813 bool aes_ctr128_requested;
816 static int parse_auth_request(char *buf, int len, struct user **u,
817 struct connection_features *cf)
820 char *p, *username, **features = NULL;
821 size_t auth_rq_len = strlen(AUTH_REQUEST_MSG);
824 memset(cf, 0, sizeof(*cf));
825 if (len < auth_rq_len + 2)
826 return -E_AUTH_REQUEST;
827 if (strncmp(buf, AUTH_REQUEST_MSG, auth_rq_len) != 0)
828 return -E_AUTH_REQUEST;
829 username = buf + auth_rq_len;
830 p = strchr(username, ' ');
834 return -E_AUTH_REQUEST;
837 create_argv(p, ",", &features);
838 for (i = 0; features[i]; i++) {
839 if (strcmp(features[i], "sideband") == 0)
840 cf->sideband_requested = true;
841 else if (strcmp(features[i], "aes_ctr128") == 0)
842 cf->aes_ctr128_requested = true;
844 ret = -E_BAD_FEATURE;
849 PARA_DEBUG_LOG("received auth request for user %s\n", username);
850 *u = lookup_user(username);
857 #define HANDSHAKE_BUFSIZE 4096
859 static int run_command(struct command_context *cc, struct iovec *iov,
860 const char *peername)
864 struct server_command *cmd;
866 if (iov->iov_base == NULL || iov->iov_len == 0)
869 p[iov->iov_len - 1] = '\0'; /* just to be sure */
870 cmd = get_cmd_ptr(p, NULL);
873 ret = check_perms(cc->u->perms, cmd);
876 end = iov->iov_base + iov->iov_len;
877 for (i = 0; p < end; i++)
880 cc->argv = para_malloc((cc->argc + 1) * sizeof(char *));
881 for (i = 0, p = iov->iov_base; p < end; i++) {
882 cc->argv[i] = para_strdup(p);
885 cc->argv[cc->argc] = NULL;
886 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name,
887 cc->u->name, peername);
888 ret = cmd->handler(cc);
890 mutex_lock(mmd_mutex);
892 if (ret >= 0 && (cmd->perms & AFS_WRITE))
894 mutex_unlock(mmd_mutex);
899 * Perform user authentication and execute a command.
901 * \param fd The file descriptor to send output to.
902 * \param peername Identifies the connecting peer.
904 * Whenever para_server accepts an incoming tcp connection on the port it
905 * listens on, it forks and the resulting child calls this function.
907 * An RSA-based challenge/response is used to authenticate the peer. It that
908 * authentication succeeds, a random session key is generated and sent back to
909 * the peer, encrypted with its RSA public key. From this point on, all
910 * transfers are crypted with this session key.
912 * Next it is checked if the peer supplied a valid server command or a command
913 * for the audio file selector. If yes, and if the user has sufficient
914 * permissions to execute that command, the function calls the corresponding
915 * command handler which does argument checking and further processing.
917 * In order to cope with a DOS attacks, a timeout is set up which terminates
918 * the function if the connection was not authenticated when the timeout
921 * \sa alarm(2), crypt.c, crypt.h
923 __noreturn void handle_connect(int fd, const char *peername)
926 unsigned char rand_buf[CHALLENGE_SIZE + 2 * SESSION_KEY_LEN];
927 unsigned char challenge_hash[HASH_SIZE];
928 char *command = NULL, *buf = para_malloc(HANDSHAKE_BUFSIZE) /* must be on the heap */;
930 struct command_context cc_struct = {.peer = peername}, *cc = &cc_struct;
932 struct connection_features cf;
936 /* we need a blocking fd here as recv() might return EAGAIN otherwise. */
937 ret = mark_fd_blocking(fd);
940 /* send Welcome message */
941 ret = write_va_buffer(fd, "This is para_server, version "
942 PACKAGE_VERSION ".\n"
943 "Features: sideband,aes_ctr128\n"
947 /* recv auth request line */
948 ret = recv_buffer(fd, buf, HANDSHAKE_BUFSIZE);
951 ret = parse_auth_request(buf, ret, &cc->u, &cf);
954 if (!cf.sideband_requested) { /* sideband is mandatory */
955 PARA_ERROR_LOG("client did not request sideband\n");
956 ret = -E_BAD_FEATURE;
960 get_random_bytes_or_die(rand_buf, sizeof(rand_buf));
961 ret = pub_encrypt(cc->u->pubkey, rand_buf, sizeof(rand_buf),
962 (unsigned char *)buf);
968 * We don't want to reveal our user names, so we send a
969 * challenge to the client even if the user does not exist, and
970 * fail the authentication later.
973 get_random_bytes_or_die((unsigned char *)buf, numbytes);
975 PARA_DEBUG_LOG("sending %u byte challenge + session key (%zu bytes)\n",
976 CHALLENGE_SIZE, numbytes);
977 ret = send_sb(&cc->scc, buf, numbytes, SBD_CHALLENGE, false);
981 ret = recv_sb(&cc->scc, SBD_CHALLENGE_RESPONSE,
982 HANDSHAKE_BUFSIZE, &iov);
986 numbytes = iov.iov_len;
987 PARA_DEBUG_LOG("received %zu bytes challenge response\n", numbytes);
992 * The correct response is the hash of the first CHALLENGE_SIZE bytes
993 * of the random data.
996 if (numbytes != HASH_SIZE)
998 hash_function((char *)rand_buf, CHALLENGE_SIZE, challenge_hash);
999 if (memcmp(challenge_hash, buf, HASH_SIZE))
1001 /* auth successful */
1003 PARA_INFO_LOG("good auth for %s\n", cc->u->name);
1004 /* init stream cipher keys with the second part of the random buffer */
1005 cc->scc.recv = sc_new(rand_buf + CHALLENGE_SIZE, SESSION_KEY_LEN,
1006 cf.aes_ctr128_requested);
1007 cc->scc.send = sc_new(rand_buf + CHALLENGE_SIZE + SESSION_KEY_LEN,
1008 SESSION_KEY_LEN, cf.aes_ctr128_requested);
1009 ret = send_sb(&cc->scc, NULL, 0, SBD_PROCEED, false);
1012 ret = recv_sb(&cc->scc, SBD_COMMAND, MAX_COMMAND_LEN, &iov);
1015 ret = run_command(cc, &iov, peername);
1022 if (send_strerror(cc, -ret) >= 0)
1023 send_sb(&cc->scc, NULL, 0, SBD_EXIT__FAILURE, true);
1025 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1029 mutex_lock(mmd_mutex);
1030 mmd->active_connections--;
1031 mutex_unlock(mmd_mutex);
1033 ret = send_sb(&cc->scc, NULL, 0, SBD_EXIT__SUCCESS, true);
1035 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1037 sc_free(cc->scc.recv);
1038 sc_free(cc->scc.send);
1039 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);