2 * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include "gsskrb5_locl.h"
37 _gsskrb5_encode_om_uint32(OM_uint32 n, u_char *p)
39 p[0] = (n >> 0) & 0xFF;
40 p[1] = (n >> 8) & 0xFF;
41 p[2] = (n >> 16) & 0xFF;
42 p[3] = (n >> 24) & 0xFF;
47 _gsskrb5_encode_be_om_uint32(OM_uint32 n, u_char *p)
49 p[0] = (n >> 24) & 0xFF;
50 p[1] = (n >> 16) & 0xFF;
51 p[2] = (n >> 8) & 0xFF;
52 p[3] = (n >> 0) & 0xFF;
57 _gsskrb5_decode_om_uint32(const void *ptr, OM_uint32 *n)
59 const u_char *p = ptr;
60 *n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
65 _gsskrb5_decode_be_om_uint32(const void *ptr, OM_uint32 *n)
67 const u_char *p = ptr;
68 *n = (p[0] <<24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0);
72 static krb5_error_code
73 hash_input_chan_bindings (const gss_channel_bindings_t b,
79 ctx = EVP_MD_CTX_create();
80 EVP_DigestInit_ex(ctx, EVP_md5(), NULL);
82 _gsskrb5_encode_om_uint32 (b->initiator_addrtype, num);
83 EVP_DigestUpdate(ctx, num, sizeof(num));
84 _gsskrb5_encode_om_uint32 (b->initiator_address.length, num);
85 EVP_DigestUpdate(ctx, num, sizeof(num));
86 if (b->initiator_address.length)
88 b->initiator_address.value,
89 b->initiator_address.length);
90 _gsskrb5_encode_om_uint32 (b->acceptor_addrtype, num);
91 EVP_DigestUpdate(ctx, num, sizeof(num));
92 _gsskrb5_encode_om_uint32 (b->acceptor_address.length, num);
93 EVP_DigestUpdate(ctx, num, sizeof(num));
94 if (b->acceptor_address.length)
96 b->acceptor_address.value,
97 b->acceptor_address.length);
98 _gsskrb5_encode_om_uint32 (b->application_data.length, num);
99 EVP_DigestUpdate(ctx, num, sizeof(num));
100 if (b->application_data.length)
101 EVP_DigestUpdate(ctx,
102 b->application_data.value,
103 b->application_data.length);
104 EVP_DigestFinal_ex(ctx, p, NULL);
105 EVP_MD_CTX_destroy(ctx);
111 * create a checksum over the chanel bindings in
112 * `input_chan_bindings', `flags' and `fwd_data' and return it in
117 _gsskrb5_create_8003_checksum (
118 OM_uint32 *minor_status,
119 const gss_channel_bindings_t input_chan_bindings,
121 const krb5_data *fwd_data,
127 * see rfc1964 (section 1.1.1 (Initial Token), and the checksum value
129 result->cksumtype = CKSUMTYPE_GSSAPI;
130 if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG))
131 result->checksum.length = 24 + 4 + fwd_data->length;
133 result->checksum.length = 24;
134 result->checksum.data = malloc (result->checksum.length);
135 if (result->checksum.data == NULL) {
136 *minor_status = ENOMEM;
137 return GSS_S_FAILURE;
140 p = result->checksum.data;
141 _gsskrb5_encode_om_uint32 (16, p);
143 if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS) {
146 hash_input_chan_bindings (input_chan_bindings, p);
149 _gsskrb5_encode_om_uint32 (flags, p);
152 if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG)) {
154 *p++ = (1 >> 0) & 0xFF; /* DlgOpt */ /* == 1 */
155 *p++ = (1 >> 8) & 0xFF; /* DlgOpt */ /* == 0 */
156 *p++ = (fwd_data->length >> 0) & 0xFF; /* Dlgth */
157 *p++ = (fwd_data->length >> 8) & 0xFF; /* Dlgth */
158 memcpy(p, (unsigned char *) fwd_data->data, fwd_data->length);
160 p += fwd_data->length;
163 return GSS_S_COMPLETE;
167 * verify the checksum in `cksum' over `input_chan_bindings'
168 * returning `flags' and `fwd_data'
172 _gsskrb5_verify_8003_checksum(
173 OM_uint32 *minor_status,
174 const gss_channel_bindings_t input_chan_bindings,
175 const Checksum *cksum,
179 unsigned char hash[16];
183 static unsigned char zeros[16];
185 /* XXX should handle checksums > 24 bytes */
186 if(cksum->cksumtype != CKSUMTYPE_GSSAPI || cksum->checksum.length < 24) {
188 return GSS_S_BAD_BINDINGS;
191 p = cksum->checksum.data;
192 _gsskrb5_decode_om_uint32(p, &length);
193 if(length != sizeof(hash)) {
195 return GSS_S_BAD_BINDINGS;
200 if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS
201 && memcmp(p, zeros, sizeof(zeros)) != 0) {
202 if(hash_input_chan_bindings(input_chan_bindings, hash) != 0) {
204 return GSS_S_BAD_BINDINGS;
206 if(ct_memcmp(hash, p, sizeof(hash)) != 0) {
208 return GSS_S_BAD_BINDINGS;
214 _gsskrb5_decode_om_uint32(p, flags);
217 if (cksum->checksum.length > 24 && (*flags & GSS_C_DELEG_FLAG)) {
218 if(cksum->checksum.length < 28) {
220 return GSS_S_BAD_BINDINGS;
223 DlgOpt = (p[0] << 0) | (p[1] << 8);
227 return GSS_S_BAD_BINDINGS;
230 fwd_data->length = (p[0] << 0) | (p[1] << 8);
232 if(cksum->checksum.length < 28 + fwd_data->length) {
234 return GSS_S_BAD_BINDINGS;
236 fwd_data->data = malloc(fwd_data->length);
237 if (fwd_data->data == NULL) {
238 *minor_status = ENOMEM;
239 return GSS_S_FAILURE;
241 memcpy(fwd_data->data, p, fwd_data->length);
244 return GSS_S_COMPLETE;