diff options
Diffstat (limited to 'eBones/krb/recvauth.c')
| -rw-r--r-- | eBones/krb/recvauth.c | 290 |
1 files changed, 0 insertions, 290 deletions
diff --git a/eBones/krb/recvauth.c b/eBones/krb/recvauth.c deleted file mode 100644 index 45d68ee..0000000 --- a/eBones/krb/recvauth.c +++ /dev/null @@ -1,290 +0,0 @@ -/* - * Copyright 1987, 1988 by the Massachusetts Institute of Technology. - * For copying and distribution information, please see the file - * <Copyright.MIT>. - * - * from: recvauth.c,v 4.4 90/03/10 19:03:08 jon Exp $"; - * $Id: recvauth.c,v 1.3 1995/07/18 16:39:38 mark Exp $ - */ - -#if 0 -#ifndef lint -static char rcsid[] = -"$Id: recvauth.c,v 1.3 1995/07/18 16:39:38 mark Exp $"; -#endif lint -#endif - -#include <krb.h> -#include <sys/types.h> -#include <netinet/in.h> -#include <syslog.h> -#include <errno.h> -#include <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <strings.h> - - -#define KRB_SENDAUTH_VERS "AUTHV0.1" /* MUST be KRB_SENDAUTH_VLEN - chars */ - -/* - * If the protocol changes, you will need to change the version string - * and make appropriate changes in krb_sendauth.c - * be sure to support old versions of krb_sendauth! - */ - -extern int errno; - -/* - * krb_recvauth() reads (and optionally responds to) a message sent - * using krb_sendauth(). The "options" argument is a bit-field of - * selected options (see "sendauth.c" for options description). - * The only option relevant to krb_recvauth() is KOPT_DO_MUTUAL - * (mutual authentication requested). The "fd" argument supplies - * a file descriptor to read from (and write to, if mutual authenti- - * cation is requested). - * - * Part of the received message will be a Kerberos ticket sent by the - * client; this is read into the "ticket" argument. The "service" and - * "instance" arguments supply the server's Kerberos name. If the - * "instance" argument is the string "*", it is treated as a wild card - * and filled in during the krb_rd_req() call (see read_service_key()). - * - * The "faddr" and "laddr" give the sending (client) and receiving - * (local server) network addresses. ("laddr" may be left NULL unless - * mutual authentication is requested, in which case it must be set.) - * - * The authentication information extracted from the message is returned - * in "kdata". The "filename" argument indicates the file where the - * server's key can be found. (It is passed on to krb_rd_req().) If - * left null, the default "/etc/srvtab" will be used. - * - * If mutual authentication is requested, the session key schedule must - * be computed in order to reply; this schedule is returned in the - * "schedule" argument. A string containing the application version - * number from the received message is returned in "version", which - * should be large enough to hold a KRB_SENDAUTH_VLEN-character string. - * - * See krb_sendauth() for the format of the received client message. - * - * This routine supports another client format, for backward - * compatibility, consisting of: - * - * Size Variable Field - * ---- -------- ----- - * - * string tmp_buf, tkt_len length of ticket, in - * ascii - * - * char ' ' (space char) separator - * - * tkt_len ticket->dat the ticket - * - * This old-style version does not support mutual authentication. - * - * krb_recvauth() first reads the protocol version string from the - * given file descriptor. If it doesn't match the current protocol - * version (KRB_SENDAUTH_VERS), the old-style format is assumed. In - * that case, the string of characters up to the first space is read - * and interpreted as the ticket length, then the ticket is read. - * - * If the first string did match KRB_SENDAUTH_VERS, krb_recvauth() - * next reads the application protocol version string. Then the - * ticket length and ticket itself are read. - * - * The ticket is decrypted and checked by the call to krb_rd_req(). - * If no mutual authentication is required, the result of the - * krb_rd_req() call is retured by this routine. If mutual authenti- - * cation is required, a message in the following format is returned - * on "fd": - * - * Size Variable Field - * ---- -------- ----- - * - * 4 bytes tkt_len length of ticket or -1 - * if error occurred - * - * priv_len tmp_buf "private" message created - * by krb_mk_priv() which - * contains the incremented - * checksum sent by the client - * encrypted in the session - * key. (This field is not - * present in case of error.) - * - * If all goes well, KSUCCESS is returned; otherwise KFAILURE or some - * other error code is returned. - */ - -#ifndef max -#define max(a,b) (((a) > (b)) ? (a) : (b)) -#endif /* max */ - -int -krb_recvauth(options, fd, ticket, service, instance, faddr, laddr, kdata, - filename, schedule, version) -long options; /* bit-pattern of options */ -int fd; /* file descr. to read from */ -KTEXT ticket; /* storage for client's ticket */ -char *service; /* service expected */ -char *instance; /* inst expected (may be filled in) */ -struct sockaddr_in *faddr; /* address of foreign host on fd */ -struct sockaddr_in *laddr; /* local address */ -AUTH_DAT *kdata; /* kerberos data (returned) */ -char *filename; /* name of file with service keys */ -Key_schedule schedule; /* key schedule (return) */ -char *version; /* version string (filled in) */ -{ - - int i, cc, old_vers = 0; - char krb_vers[KRB_SENDAUTH_VLEN + 1]; /* + 1 for the null terminator */ - char *cp; - int rem; - long tkt_len, priv_len; - u_long cksum; - u_char tmp_buf[MAX_KTXT_LEN+max(KRB_SENDAUTH_VLEN+1,21)]; - - /* read the protocol version number */ - if (krb_net_read(fd, krb_vers, KRB_SENDAUTH_VLEN) != - KRB_SENDAUTH_VLEN) - return(errno); - krb_vers[KRB_SENDAUTH_VLEN] = '\0'; - - /* check version string */ - if (strcmp(krb_vers,KRB_SENDAUTH_VERS)) { - /* Assume the old version of sendkerberosdata: send ascii - length, ' ', and ticket. */ - if (options & KOPT_DO_MUTUAL) - return(KFAILURE); /* XXX can't do old style with mutual auth */ - old_vers = 1; - - /* copy what we have read into tmp_buf */ - (void) bcopy(krb_vers, (char *) tmp_buf, KRB_SENDAUTH_VLEN); - - /* search for space, and make it a null */ - for (i = 0; i < KRB_SENDAUTH_VLEN; i++) - if (tmp_buf[i]== ' ') { - tmp_buf[i] = '\0'; - /* point cp to the beginning of the real ticket */ - cp = (char *) &tmp_buf[i+1]; - break; - } - - if (i == KRB_SENDAUTH_VLEN) - /* didn't find the space, keep reading to find it */ - for (; i<20; i++) { - if (read(fd, (char *)&tmp_buf[i], 1) != 1) { - return(KFAILURE); - } - if (tmp_buf[i] == ' ') { - tmp_buf[i] = '\0'; - /* point cp to the beginning of the real ticket */ - cp = (char *) &tmp_buf[i+1]; - break; - } - } - - tkt_len = (long) atoi((char *) tmp_buf); - - /* sanity check the length */ - if ((i==20)||(tkt_len<=0)||(tkt_len>MAX_KTXT_LEN)) - return(KFAILURE); - - if (i < KRB_SENDAUTH_VLEN) { - /* since we already got the space, and part of the ticket, - we read fewer bytes to get the rest of the ticket */ - if (krb_net_read(fd, (char *)(tmp_buf+KRB_SENDAUTH_VLEN), - (int) (tkt_len - KRB_SENDAUTH_VLEN + 1 + i)) - != (int)(tkt_len - KRB_SENDAUTH_VLEN + 1 + i)) - return(errno); - } else { - if (krb_net_read(fd, (char *)(tmp_buf+i), (int)tkt_len) != - (int) tkt_len) - return(errno); - } - ticket->length = tkt_len; - /* copy the ticket into the struct */ - (void) bcopy(cp, (char *) ticket->dat, ticket->length); - - } else { - /* read the application version string */ - if (krb_net_read(fd, version, KRB_SENDAUTH_VLEN) != - KRB_SENDAUTH_VLEN) - return(errno); - version[KRB_SENDAUTH_VLEN] = '\0'; - - /* get the length of the ticket */ - if (krb_net_read(fd, (char *)&tkt_len, sizeof(tkt_len)) != - sizeof(tkt_len)) - return(errno); - - /* sanity check */ - ticket->length = ntohl((unsigned long)tkt_len); - if ((ticket->length <= 0) || (ticket->length > MAX_KTXT_LEN)) { - if (options & KOPT_DO_MUTUAL) { - rem = KFAILURE; - goto mutual_fail; - } else - return(KFAILURE); /* XXX there may still be junk on the fd? */ - } - - /* read the ticket */ - if (krb_net_read(fd, (char *) ticket->dat, ticket->length) - != ticket->length) - return(errno); - } - /* - * now have the ticket. decrypt it to get the authenticated - * data. - */ - rem = krb_rd_req(ticket,service,instance,faddr->sin_addr.s_addr, - kdata,filename); - - if (old_vers) return(rem); /* XXX can't do mutual with old client */ - - /* if we are doing mutual auth, compose a response */ - if (options & KOPT_DO_MUTUAL) { - if (rem != KSUCCESS) - /* the krb_rd_req failed */ - goto mutual_fail; - - /* add one to the (formerly) sealed checksum, and re-seal it - for return to the client */ - cksum = kdata->checksum + 1; - cksum = htonl(cksum); -#ifndef NOENCRYPTION - key_sched((C_Block *)kdata->session,schedule); -#endif - priv_len = krb_mk_priv((unsigned char *)&cksum, - tmp_buf, - (unsigned long) sizeof(cksum), - schedule, - kdata->session, - laddr, - faddr); - if (priv_len < 0) { - /* re-sealing failed; notify the client */ - rem = KFAILURE; /* XXX */ -mutual_fail: - priv_len = -1; - tkt_len = htonl((unsigned long) priv_len); - /* a length of -1 is interpreted as an authentication - failure by the client */ - if ((cc = krb_net_write(fd, (char *)&tkt_len, sizeof(tkt_len))) - != sizeof(tkt_len)) - return(cc); - return(rem); - } else { - /* re-sealing succeeded, send the private message */ - tkt_len = htonl((unsigned long)priv_len); - if ((cc = krb_net_write(fd, (char *)&tkt_len, sizeof(tkt_len))) - != sizeof(tkt_len)) - return(cc); - if ((cc = krb_net_write(fd, (char *)tmp_buf, (int) priv_len)) - != (int) priv_len) - return(cc); - } - } - return(rem); -} |
