1 /* 2 * Copyright (c) 2007 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "gsskrb5_locl.h" 35 36 OM_uint32 GSSAPI_CALLCONV 37 _gsskrb5_pseudo_random(OM_uint32 *minor_status, 38 gss_ctx_id_t context_handle, 39 int prf_key, 40 const gss_buffer_t prf_in, 41 ssize_t desired_output_len, 42 gss_buffer_t prf_out) 43 { 44 gsskrb5_ctx ctx = (gsskrb5_ctx)context_handle; 45 krb5_context context; 46 krb5_error_code ret; 47 krb5_crypto crypto; 48 krb5_data input, output; 49 uint32_t num; 50 OM_uint32 junk; 51 unsigned char *p; 52 krb5_keyblock *key = NULL; 53 size_t dol; 54 55 if (ctx == NULL) { 56 *minor_status = 0; 57 return GSS_S_NO_CONTEXT; 58 } 59 60 if (desired_output_len <= 0 || prf_in->length + 4 < prf_in->length) { 61 *minor_status = 0; 62 return GSS_S_FAILURE; 63 } 64 dol = desired_output_len; 65 66 GSSAPI_KRB5_INIT (&context); 67 68 switch(prf_key) { 69 case GSS_C_PRF_KEY_FULL: 70 _gsskrb5i_get_acceptor_subkey(ctx, context, &key); 71 break; 72 case GSS_C_PRF_KEY_PARTIAL: 73 _gsskrb5i_get_initiator_subkey(ctx, context, &key); 74 break; 75 default: 76 _gsskrb5_set_status(EINVAL, "unknown kerberos prf_key"); 77 *minor_status = EINVAL; 78 return GSS_S_FAILURE; 79 } 80 81 if (key == NULL) { 82 _gsskrb5_set_status(EINVAL, "no prf_key found"); 83 *minor_status = EINVAL; 84 return GSS_S_FAILURE; 85 } 86 87 ret = krb5_crypto_init(context, key, 0, &crypto); 88 krb5_free_keyblock (context, key); 89 if (ret) { 90 *minor_status = ret; 91 return GSS_S_FAILURE; 92 } 93 94 prf_out->value = malloc(dol); 95 if (prf_out->value == NULL) { 96 _gsskrb5_set_status(GSS_KRB5_S_KG_INPUT_TOO_LONG, "Out of memory"); 97 *minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG; 98 krb5_crypto_destroy(context, crypto); 99 return GSS_S_FAILURE; 100 } 101 prf_out->length = dol; 102 103 HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); 104 105 input.length = prf_in->length + 4; 106 input.data = malloc(prf_in->length + 4); 107 if (input.data == NULL) { 108 _gsskrb5_set_status(GSS_KRB5_S_KG_INPUT_TOO_LONG, "Out of memory"); 109 *minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG; 110 gss_release_buffer(&junk, prf_out); 111 krb5_crypto_destroy(context, crypto); 112 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); 113 return GSS_S_FAILURE; 114 } 115 memcpy(((uint8_t *)input.data) + 4, prf_in->value, prf_in->length); 116 117 num = 0; 118 p = prf_out->value; 119 while(dol > 0) { 120 size_t tsize; 121 122 _gsskrb5_encode_be_om_uint32(num, input.data); 123 124 ret = krb5_crypto_prf(context, crypto, &input, &output); 125 if (ret) { 126 *minor_status = ret; 127 free(input.data); 128 gss_release_buffer(&junk, prf_out); 129 krb5_crypto_destroy(context, crypto); 130 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); 131 return GSS_S_FAILURE; 132 } 133 134 tsize = min(dol, output.length); 135 memcpy(p, output.data, tsize); 136 p += tsize; 137 dol -= tsize; 138 krb5_data_free(&output); 139 num++; 140 } 141 free(input.data); 142 143 krb5_crypto_destroy(context, crypto); 144 145 HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); 146 147 return GSS_S_COMPLETE; 148 } 149