1 files changed, 163 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/sendauth.c b/crypto/kerberosIV/lib/krb/sendauth.c
new file mode 100644
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+++ b/crypto/kerberosIV/lib/krb/sendauth.c
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+/* 
+  Copyright (C) 1989 by the Massachusetts Institute of Technology
+
+   Export of this software from the United States of America is assumed
+   to require a specific license from the United States Government.
+   It is the responsibility of any person or organization contemplating
+   export to obtain such a license before exporting.
+
+WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+distribute this software and its documentation for any purpose and
+without fee is hereby granted, provided that the above copyright
+notice appear in all copies and that both that copyright notice and
+this permission notice appear in supporting documentation, and that
+the name of M.I.T. not be used in advertising or publicity pertaining
+to distribution of the software without specific, written prior
+permission.  M.I.T. makes no representations about the suitability of
+this software for any purpose.  It is provided "as is" without express
+or implied warranty.
+
+  */
+
+#include "krb_locl.h"
+
+RCSID("$Id: sendauth.c,v 1.15 1997/04/18 14:11:36 joda Exp $");
+
+/*
+ * krb_sendauth() transmits a ticket over a file descriptor for a
+ * desired service, instance, and realm, doing mutual authentication
+ * with the server if desired.
+ */
+
+/*
+ * The first argument to krb_sendauth() contains a bitfield of
+ * options (the options are defined in "krb.h"):
+ *
+ * KOPT_DONT_CANON	Don't canonicalize instance as a hostname.
+ *			(If this option is not chosen, krb_get_phost()
+ *			is called to canonicalize it.)
+ *
+ * KOPT_DONT_MK_REQ 	Don't request server ticket from Kerberos.
+ *			A ticket must be supplied in the "ticket"
+ *			argument.
+ *			(If this option is not chosen, and there
+ *			is no ticket for the given server in the
+ *			ticket cache, one will be fetched using
+ *			krb_mk_req() and returned in "ticket".)
+ *
+ * KOPT_DO_MUTUAL	Do mutual authentication, requiring that the
+ * 			receiving server return the checksum+1 encrypted
+ *			in the session key.  The mutual authentication
+ *			is done using krb_mk_priv() on the other side
+ *			(see "recvauth.c") and krb_rd_priv() on this
+ *			side.
+ *
+ * The "fd" argument is a file descriptor to write to the remote
+ * server on.  The "ticket" argument is used to store the new ticket
+ * from the krb_mk_req() call. If the KOPT_DONT_MK_REQ options is
+ * chosen, the ticket must be supplied in the "ticket" argument.
+ * The "service", "inst", and "realm" arguments identify the ticket.
+ * If "realm" is null, the local realm is used.
+ *
+ * The following arguments are only needed if the KOPT_DO_MUTUAL option
+ * is chosen:
+ *
+ *   The "checksum" argument is a number that the server will add 1 to
+ *   to authenticate itself back to the client; the "msg_data" argument
+ *   holds the returned mutual-authentication message from the server
+ *   (i.e., the checksum+1); the "cred" structure is used to hold the
+ *   session key of the server, extracted from the ticket file, for use
+ *   in decrypting the mutual authentication message from the server;
+ *   and "schedule" holds the key schedule for that decryption.  The
+ *   the local and server addresses are given in "laddr" and "faddr".
+ *
+ * The application protocol version number (of up to KRB_SENDAUTH_VLEN
+ * characters) is passed in "version".
+ *
+ * If all goes well, KSUCCESS is returned, otherwise some error code.
+ *
+ * The format of the message sent to the server is:
+ *
+ * Size			Variable		Field
+ * ----			--------		-----
+ *
+ * KRB_SENDAUTH_VLEN	KRB_SENDAUTH_VER	sendauth protocol
+ * bytes					version number
+ *
+ * KRB_SENDAUTH_VLEN	version			application protocol
+ * bytes					version number
+ *
+ * 4 bytes		ticket->length		length of ticket
+ *
+ * ticket->length	ticket->dat		ticket itself
+ */
+
+int
+krb_sendauth(int32_t options,	/* bit-pattern of options */
+	     int fd,		/* file descriptor to write onto */
+	     KTEXT ticket,	/* where to put ticket (return); or
+				 * supplied in case of KOPT_DONT_MK_REQ */
+	     char *service,	/* service name, instance, realm */
+	     char *instance,
+	     char *realm,
+	     u_int32_t checksum, /* checksum to include in request */
+	     MSG_DAT *msg_data,	/* mutual auth MSG_DAT (return) */
+	     CREDENTIALS *cred,	/* credentials (return) */
+	     struct des_ks_struct *schedule, /* key schedule (return) */
+	     struct sockaddr_in *laddr, /* local address */
+	     struct sockaddr_in *faddr,	/* address of foreign host on fd */
+	     char *version)	/* version string */
+{
+    int ret;
+    KTEXT_ST buf;
+    char realrealm[REALM_SZ];
+
+    if (realm == NULL) {
+	ret = krb_get_lrealm (realrealm, 1);
+	if (ret != KSUCCESS)
+	    return ret;
+	realm = realrealm;
+    }
+    ret = krb_mk_auth (options, ticket, service, instance, realm, checksum,
+		       version, &buf);
+    if (ret != KSUCCESS)
+	return ret;
+    ret = krb_net_write(fd, buf.dat, buf.length);
+    if(ret < 0)
+	return -1;
+      
+    if (options & KOPT_DO_MUTUAL) {
+	char tmp[4];
+	u_int32_t len;
+	char inst[INST_SZ];
+
+	ret = krb_net_read (fd, tmp, 4);
+	if (ret < 0)
+	    return -1;
+
+	krb_get_int (tmp, &len, 4, 0);
+	if (len == 0xFFFFFFFF || len > sizeof(buf.dat))
+	    return KFAILURE;
+	buf.length = len;
+	ret = krb_net_read (fd, buf.dat, len);
+	if (ret < 0)
+	    return -1;
+
+	if (options & KOPT_DONT_CANON)
+	    strncpy (inst, instance, sizeof(inst));
+	else
+	    strncpy (inst, krb_get_phost(instance), sizeof(inst));
+
+	ret = krb_get_cred (service, inst, realm, cred);
+	if (ret != KSUCCESS)
+	    return ret;
+
+	des_key_sched(&cred->session, schedule);
+
+	ret = krb_check_auth (&buf, checksum, msg_data, &cred->session, 
+			      schedule, laddr, faddr);
+	if (ret != KSUCCESS)
+	    return ret;
+    }
+    return KSUCCESS;
+}