1 /* $Id: mech_plain.c,v 1.1.1.1 2010/11/27 21:23:59 agc Exp $ */ 2 3 /* Copyright (c) 2010 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Mateusz Kocielski. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <saslc.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include "saslc_private.h" 42 #include "mech.h" 43 #include "error.h" 44 45 /* local headers */ 46 47 /* properties */ 48 #define SASLC_PLAIN_AUTHZID "AUTHZID" 49 #define SASLC_PLAIN_AUTHCID "AUTHCID" 50 #define SASLC_PLAIN_PASSWORD "PASSWD" 51 52 #define NUL_DELIM '\x00' 53 #define CRED_MAX_LEN 255 54 55 static int saslc__mech_plain_cont(saslc_sess_t *, const void *, size_t, 56 void **, size_t *); 57 58 /** 59 * @brief doing one step of the sasl authentication 60 * @param sess sasl session 61 * @param in input data 62 * @param inlen input data length 63 * @param out place to store output data 64 * @param outlen output data length 65 * @return MECH_OK - success, 66 * MECH_STEP - more steps are needed, 67 * MECH_ERROR - error 68 */ 69 70 /*ARGSUSED*/ 71 static int 72 saslc__mech_plain_cont(saslc_sess_t *sess, const void *in, size_t inlen, 73 void **out, size_t *outlen) 74 { 75 const char *authzid, *authcid, *passwd; 76 char *outstr; 77 int len; 78 79 authzid = saslc_sess_getprop(sess, SASLC_PLAIN_AUTHZID); 80 if (authzid != NULL && strlen(authzid) > CRED_MAX_LEN) { 81 saslc__error_set(ERR(sess), ERROR_MECH, 82 "authzid should be shorter than 256 characters"); 83 return MECH_ERROR; 84 } 85 86 if ((authcid = saslc_sess_getprop(sess, SASLC_PLAIN_AUTHCID)) 87 == NULL) { 88 saslc__error_set(ERR(sess), ERROR_MECH, 89 "authcid is required for an authentication"); 90 return MECH_ERROR; 91 } 92 if (strlen(authcid) > CRED_MAX_LEN) { 93 saslc__error_set(ERR(sess), ERROR_MECH, 94 "authcid should be shorter than 256 characters"); 95 return MECH_ERROR; 96 } 97 98 if ((passwd = saslc_sess_getprop(sess, SASLC_PLAIN_PASSWORD)) 99 == NULL) { 100 saslc__error_set(ERR(sess), ERROR_MECH, 101 "passwd is required for an authentication"); 102 return MECH_ERROR; 103 } 104 if (strlen(passwd) > CRED_MAX_LEN) { 105 saslc__error_set(ERR(sess), ERROR_MECH, 106 "passwd should be shorter than 256 characters"); 107 return MECH_ERROR; 108 } 109 110 len = asprintf(&outstr, "%s%c%s%c%s", authzid != NULL ? 111 authzid : "", NUL_DELIM, authcid, NUL_DELIM, passwd); 112 if (len == -1) 113 return MECH_ERROR; 114 *out = outstr; 115 *outlen = len + 1; 116 117 return MECH_OK; 118 } 119 120 121 /* mechanism definition */ 122 const saslc__mech_t saslc__mech_plain = { 123 "PLAIN", /* name */ 124 FLAG_PLAINTEXT, /* flags */ 125 saslc__mech_generic_create, /* create */ 126 saslc__mech_plain_cont, /* step */ 127 NULL, /* encode */ 128 NULL, /* decode */ 129 saslc__mech_generic_destroy /* destroy */ 130 }; 131