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56 #include "gssapiP_eap.h"
59 gssEapWrapOrGetMIC(OM_uint32 *minor,
63 gss_iov_buffer_desc *iov,
65 enum gss_eap_token_type toktype)
67 krb5_error_code code = 0;
68 gss_iov_buffer_t header;
69 gss_iov_buffer_t padding;
70 gss_iov_buffer_t trailer;
71 unsigned char acceptorFlag;
72 unsigned char *outbuf = NULL;
73 unsigned char *tbuf = NULL;
76 unsigned int gssHeaderLen, gssTrailerLen;
77 size_t dataLen, assocDataLen;
78 krb5_context krbContext;
80 if (ctx->encryptionType == ENCTYPE_NULL)
81 return GSS_S_UNAVAILABLE;
83 GSSEAP_KRB_INIT(&krbContext);
85 acceptorFlag = CTX_IS_INITIATOR(ctx) ? 0 : TOK_FLAG_SENDER_IS_ACCEPTOR;
89 keyUsage = CTX_IS_INITIATOR(ctx)
90 ? KEY_USAGE_INITIATOR_SEAL
91 : KEY_USAGE_ACCEPTOR_SEAL;
94 keyUsage = KEY_USAGE_CHANNEL_BINDINGS;
98 keyUsage = CTX_IS_INITIATOR(ctx)
99 ? KEY_USAGE_INITIATOR_SIGN
100 : KEY_USAGE_ACCEPTOR_SIGN;
104 gssEapIovMessageLength(iov, iov_count, &dataLen, &assocDataLen);
106 header = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
107 if (header == NULL) {
109 return GSS_S_FAILURE;
112 padding = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
114 padding->buffer.length = 0;
116 trailer = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
118 if (toktype == TOK_TYPE_WRAP && conf_req_flag) {
119 unsigned int krbHeaderLen, krbTrailerLen, krbPadLen;
121 size_t confDataLen = dataLen - assocDataLen;
123 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
124 KRB5_CRYPTO_TYPE_HEADER, &krbHeaderLen);
128 code = krb5_c_padding_length(krbContext, ctx->encryptionType,
129 confDataLen + 16 /* E(Header) */,
134 if (krbPadLen == 0 && (ctx->gssFlags & GSS_C_DCE_STYLE)) {
135 /* Windows rejects AEAD tokens with non-zero EC */
136 code = krb5_c_block_size(krbContext, ctx->encryptionType, &ec);
142 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
143 KRB5_CRYPTO_TYPE_TRAILER, &krbTrailerLen);
147 gssHeaderLen = 16 /* Header */ + krbHeaderLen;
148 gssTrailerLen = ec + 16 /* E(Header) */ + krbTrailerLen;
150 if (trailer == NULL) {
152 /* Workaround for Windows bug where it rotates by EC + RRC */
153 if (ctx->gssFlags & GSS_C_DCE_STYLE)
155 gssHeaderLen += gssTrailerLen;
158 if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE) {
159 code = gssEapAllocIov(header, (size_t)gssHeaderLen);
160 } else if (header->buffer.length < gssHeaderLen)
161 code = KRB5_BAD_MSIZE;
164 outbuf = (unsigned char *)header->buffer.value;
165 header->buffer.length = (size_t)gssHeaderLen;
167 if (trailer != NULL) {
168 if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
169 code = gssEapAllocIov(trailer, (size_t)gssTrailerLen);
170 else if (trailer->buffer.length < gssTrailerLen)
171 code = KRB5_BAD_MSIZE;
174 trailer->buffer.length = (size_t)gssTrailerLen;
178 store_uint16_be((uint16_t)toktype, outbuf);
180 outbuf[2] = (acceptorFlag
181 | (conf_req_flag ? TOK_FLAG_WRAP_CONFIDENTIAL : 0)
182 | (0 ? TOK_FLAG_ACCEPTOR_SUBKEY : 0));
186 store_uint16_be(ec, outbuf + 4);
188 store_uint16_be(0, outbuf + 6);
189 store_uint64_be(ctx->sendSeq, outbuf + 8);
192 * EC | copy of header to be encrypted, located in
193 * (possibly rotated) trailer
196 tbuf = (unsigned char *)header->buffer.value + 16; /* Header */
198 tbuf = (unsigned char *)trailer->buffer.value;
200 memset(tbuf, 0xFF, ec);
201 memcpy(tbuf + ec, header->buffer.value, 16);
203 code = gssEapEncrypt(krbContext,
204 ((ctx->gssFlags & GSS_C_DCE_STYLE) != 0),
205 ec, rrc, &ctx->rfc3961Key,
206 keyUsage, 0, iov, iov_count);
211 store_uint16_be(rrc, outbuf + 6);
214 } else if (toktype == TOK_TYPE_WRAP && !conf_req_flag) {
219 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
220 KRB5_CRYPTO_TYPE_CHECKSUM,
225 assert(gssTrailerLen <= 0xFFFF);
227 if (trailer == NULL) {
229 gssHeaderLen += gssTrailerLen;
232 if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
233 code = gssEapAllocIov(header, (size_t)gssHeaderLen);
234 else if (header->buffer.length < gssHeaderLen)
235 code = KRB5_BAD_MSIZE;
238 outbuf = (unsigned char *)header->buffer.value;
239 header->buffer.length = (size_t)gssHeaderLen;
241 if (trailer != NULL) {
242 if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
243 code = gssEapAllocIov(trailer, (size_t)gssTrailerLen);
244 else if (trailer->buffer.length < gssTrailerLen)
245 code = KRB5_BAD_MSIZE;
248 trailer->buffer.length = (size_t)gssTrailerLen;
252 store_uint16_be((uint16_t)toktype, outbuf);
254 outbuf[2] = (acceptorFlag
255 | (0 ? TOK_FLAG_ACCEPTOR_SUBKEY : 0));
258 if (toktype == TOK_TYPE_WRAP) {
259 /* Use 0 for checksum calculation, substitute
260 * checksum length later.
263 store_uint16_be(0, outbuf + 4);
265 store_uint16_be(0, outbuf + 6);
267 /* MIC and DEL store 0xFF in EC and RRC */
268 store_uint16_be(0xFFFF, outbuf + 4);
269 store_uint16_be(0xFFFF, outbuf + 6);
271 store_uint64_be(ctx->sendSeq, outbuf + 8);
273 code = gssEapSign(krbContext, 0, /* 0 == pick from crypto */
274 rrc, &ctx->rfc3961Key, keyUsage,
279 if (toktype != TOK_TYPE_GSS_CB)
282 if (toktype == TOK_TYPE_WRAP) {
283 /* Fix up EC field */
284 store_uint16_be(gssTrailerLen, outbuf + 4);
285 /* Fix up RRC field */
286 store_uint16_be(rrc, outbuf + 6);
288 } else if (toktype == TOK_TYPE_MIC || toktype == TOK_TYPE_GSS_CB) {
290 goto wrap_with_checksum;
291 } else if (toktype == TOK_TYPE_DELETE_CONTEXT) {
293 goto wrap_with_checksum;
302 gssEapReleaseIov(iov, iov_count);
306 return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
310 gss_wrap_iov(OM_uint32 *minor,
315 gss_iov_buffer_desc *iov,
318 if (!CTX_IS_ESTABLISHED(ctx))
319 return GSS_S_NO_CONTEXT;
321 return gssEapWrapOrGetMIC(minor, ctx, conf_req_flag, conf_state,
322 iov, iov_count, TOK_TYPE_WRAP);