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56 #include "gssapiP_eap.h"
59 rfc4121Flags(gss_ctx_id_t ctx, int receiving)
64 isAcceptor = !CTX_IS_INITIATOR(ctx);
66 isAcceptor = !isAcceptor;
70 flags |= TOK_FLAG_SENDER_IS_ACCEPTOR;
72 if ((ctx->flags & CTX_FLAG_KRB_REAUTH_GSS) &&
73 (ctx->gssFlags & GSS_C_MUTUAL_FLAG))
74 flags |= TOK_FLAG_ACCEPTOR_SUBKEY;
80 gssEapWrapOrGetMIC(OM_uint32 *minor,
84 gss_iov_buffer_desc *iov,
86 enum gss_eap_token_type toktype)
88 krb5_error_code code = 0;
89 gss_iov_buffer_t header;
90 gss_iov_buffer_t padding;
91 gss_iov_buffer_t trailer;
93 unsigned char *outbuf = NULL;
94 unsigned char *tbuf = NULL;
97 unsigned int gssHeaderLen, gssTrailerLen;
98 size_t dataLen, assocDataLen;
99 krb5_context krbContext;
101 if (ctx->encryptionType == ENCTYPE_NULL)
102 return GSS_S_UNAVAILABLE;
104 GSSEAP_KRB_INIT(&krbContext);
106 flags = rfc4121Flags(ctx, FALSE);
108 if (toktype == TOK_TYPE_WRAP) {
109 keyUsage = CTX_IS_INITIATOR(ctx)
110 ? KEY_USAGE_INITIATOR_SEAL
111 : KEY_USAGE_ACCEPTOR_SEAL;
113 keyUsage = CTX_IS_INITIATOR(ctx)
114 ? KEY_USAGE_INITIATOR_SIGN
115 : KEY_USAGE_ACCEPTOR_SIGN;
118 gssEapIovMessageLength(iov, iov_count, &dataLen, &assocDataLen);
120 header = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
121 if (header == NULL) {
123 return GSS_S_FAILURE;
126 padding = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
128 padding->buffer.length = 0;
130 trailer = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
132 if (toktype == TOK_TYPE_WRAP && conf_req_flag) {
133 unsigned int krbHeaderLen, krbTrailerLen, krbPadLen;
135 size_t confDataLen = dataLen - assocDataLen;
137 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
138 KRB5_CRYPTO_TYPE_HEADER, &krbHeaderLen);
142 code = krb5_c_padding_length(krbContext, ctx->encryptionType,
143 confDataLen + 16 /* E(Header) */,
148 if (krbPadLen == 0 && (ctx->gssFlags & GSS_C_DCE_STYLE)) {
149 /* Windows rejects AEAD tokens with non-zero EC */
150 code = krb5_c_block_size(krbContext, ctx->encryptionType, &ec);
156 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
157 KRB5_CRYPTO_TYPE_TRAILER, &krbTrailerLen);
161 gssHeaderLen = 16 /* Header */ + krbHeaderLen;
162 gssTrailerLen = ec + 16 /* E(Header) */ + krbTrailerLen;
164 if (trailer == NULL) {
166 /* Workaround for Windows bug where it rotates by EC + RRC */
167 if (ctx->gssFlags & GSS_C_DCE_STYLE)
169 gssHeaderLen += gssTrailerLen;
172 if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE) {
173 code = gssEapAllocIov(header, (size_t)gssHeaderLen);
174 } else if (header->buffer.length < gssHeaderLen)
175 code = KRB5_BAD_MSIZE;
178 outbuf = (unsigned char *)header->buffer.value;
179 header->buffer.length = (size_t)gssHeaderLen;
181 if (trailer != NULL) {
182 if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
183 code = gssEapAllocIov(trailer, (size_t)gssTrailerLen);
184 else if (trailer->buffer.length < gssTrailerLen)
185 code = KRB5_BAD_MSIZE;
188 trailer->buffer.length = (size_t)gssTrailerLen;
192 store_uint16_be((uint16_t)toktype, outbuf);
195 | (conf_req_flag ? TOK_FLAG_WRAP_CONFIDENTIAL : 0);
199 store_uint16_be(ec, outbuf + 4);
201 store_uint16_be(0, outbuf + 6);
202 store_uint64_be(ctx->sendSeq, outbuf + 8);
205 * EC | copy of header to be encrypted, located in
206 * (possibly rotated) trailer
209 tbuf = (unsigned char *)header->buffer.value + 16; /* Header */
211 tbuf = (unsigned char *)trailer->buffer.value;
213 memset(tbuf, 0xFF, ec);
214 memcpy(tbuf + ec, header->buffer.value, 16);
216 code = gssEapEncrypt(krbContext,
217 ((ctx->gssFlags & GSS_C_DCE_STYLE) != 0),
218 ec, rrc, &ctx->rfc3961Key,
219 keyUsage, 0, iov, iov_count);
224 store_uint16_be(rrc, outbuf + 6);
227 } else if (toktype == TOK_TYPE_WRAP && !conf_req_flag) {
232 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
233 KRB5_CRYPTO_TYPE_CHECKSUM,
238 assert(gssTrailerLen <= 0xFFFF);
240 if (trailer == NULL) {
242 gssHeaderLen += gssTrailerLen;
245 if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
246 code = gssEapAllocIov(header, (size_t)gssHeaderLen);
247 else if (header->buffer.length < gssHeaderLen)
248 code = KRB5_BAD_MSIZE;
251 outbuf = (unsigned char *)header->buffer.value;
252 header->buffer.length = (size_t)gssHeaderLen;
254 if (trailer != NULL) {
255 if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
256 code = gssEapAllocIov(trailer, (size_t)gssTrailerLen);
257 else if (trailer->buffer.length < gssTrailerLen)
258 code = KRB5_BAD_MSIZE;
261 trailer->buffer.length = (size_t)gssTrailerLen;
265 store_uint16_be((uint16_t)toktype, outbuf);
270 if (toktype == TOK_TYPE_WRAP) {
271 /* Use 0 for checksum calculation, substitute
272 * checksum length later.
275 store_uint16_be(0, outbuf + 4);
277 store_uint16_be(0, outbuf + 6);
279 /* MIC and DEL store 0xFF in EC and RRC */
280 store_uint16_be(0xFFFF, outbuf + 4);
281 store_uint16_be(0xFFFF, outbuf + 6);
283 store_uint64_be(ctx->sendSeq, outbuf + 8);
285 code = gssEapSign(krbContext, ctx->checksumType,
286 rrc, &ctx->rfc3961Key, keyUsage,
293 if (toktype == TOK_TYPE_WRAP) {
294 /* Fix up EC field */
295 store_uint16_be(gssTrailerLen, outbuf + 4);
296 /* Fix up RRC field */
297 store_uint16_be(rrc, outbuf + 6);
299 } else if (toktype == TOK_TYPE_MIC) {
301 goto wrap_with_checksum;
302 } else if (toktype == TOK_TYPE_DELETE_CONTEXT) {
304 goto wrap_with_checksum;
313 gssEapReleaseIov(iov, iov_count);
317 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
321 gss_wrap_iov(OM_uint32 *minor,
326 gss_iov_buffer_desc *iov,
329 if (!CTX_IS_ESTABLISHED(ctx))
330 return GSS_S_NO_CONTEXT;
332 return gssEapWrapOrGetMIC(minor, ctx, conf_req_flag, conf_state,
333 iov, iov_count, TOK_TYPE_WRAP);