diff options
author | Stefan Metzmacher <metze@samba.org> | 2009-08-11 19:48:50 +0200 |
---|---|---|
committer | Andrew Bartlett <abartlet@samba.org> | 2015-06-24 01:03:16 +0200 |
commit | c245d4f33e233f16aafb29a1737f8f1fa96724d7 (patch) | |
tree | 87ed67de9ad9e59ae831bb459d13bed46200509a /source4 | |
parent | 571a05c64951f28c41c73541f5824458a3bba909 (diff) | |
download | samba-c245d4f33e233f16aafb29a1737f8f1fa96724d7.tar.gz |
heimdal:lib/gssapi/krb5: implement gss_[un]wrap_iov[_length] with arcfour-hmac-md5
Pair-Programmed-With: Andreas Schneider <asn@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Diffstat (limited to 'source4')
-rw-r--r-- | source4/heimdal/lib/gssapi/krb5/aeap.c | 84 | ||||
-rw-r--r-- | source4/heimdal/lib/gssapi/krb5/arcfour.c | 559 |
2 files changed, 640 insertions, 3 deletions
diff --git a/source4/heimdal/lib/gssapi/krb5/aeap.c b/source4/heimdal/lib/gssapi/krb5/aeap.c index 87ca06d450a..fe95ecf0b9c 100644 --- a/source4/heimdal/lib/gssapi/krb5/aeap.c +++ b/source4/heimdal/lib/gssapi/krb5/aeap.c @@ -46,6 +46,9 @@ _gk_wrap_iov(OM_uint32 * minor_status, { const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle; krb5_context context; + OM_uint32 ret; + krb5_keyblock *key; + krb5_keytype keytype; GSSAPI_KRB5_INIT (&context); @@ -54,7 +57,30 @@ _gk_wrap_iov(OM_uint32 * minor_status, conf_req_flag, conf_state, iov, iov_count); - return GSS_S_FAILURE; + HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); + ret = _gsskrb5i_get_token_key(ctx, context, &key); + HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); + if (ret) { + *minor_status = ret; + return GSS_S_FAILURE; + } + krb5_enctype_to_keytype(context, key->keytype, &keytype); + + switch (keytype) { + case KEYTYPE_ARCFOUR: + case KEYTYPE_ARCFOUR_56: + ret = _gssapi_wrap_iov_arcfour(minor_status, ctx, context, + conf_req_flag, conf_state, + iov, iov_count, key); + break; + + default: + ret = GSS_S_FAILURE; + break; + } + + krb5_free_keyblock(context, key); + return ret; } OM_uint32 GSSAPI_CALLCONV @@ -67,6 +93,9 @@ _gk_unwrap_iov(OM_uint32 *minor_status, { const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle; krb5_context context; + OM_uint32 ret; + krb5_keytype keytype; + krb5_keyblock *key; GSSAPI_KRB5_INIT (&context); @@ -74,7 +103,30 @@ _gk_unwrap_iov(OM_uint32 *minor_status, return _gssapi_unwrap_cfx_iov(minor_status, ctx, context, conf_state, qop_state, iov, iov_count); - return GSS_S_FAILURE; + HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); + ret = _gsskrb5i_get_token_key(ctx, context, &key); + HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); + if (ret) { + *minor_status = ret; + return GSS_S_FAILURE; + } + krb5_enctype_to_keytype(context, key->keytype, &keytype); + + switch (keytype) { + case KEYTYPE_ARCFOUR: + case KEYTYPE_ARCFOUR_56: + ret = _gssapi_unwrap_iov_arcfour(minor_status, ctx, context, + conf_state, qop_state, + iov, iov_count, key); + break; + + default: + ret = GSS_S_FAILURE; + break; + } + + krb5_free_keyblock(context, key); + return ret; } OM_uint32 GSSAPI_CALLCONV @@ -88,6 +140,9 @@ _gk_wrap_iov_length(OM_uint32 * minor_status, { const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle; krb5_context context; + OM_uint32 ret; + krb5_keytype keytype; + krb5_keyblock *key; GSSAPI_KRB5_INIT (&context); @@ -96,5 +151,28 @@ _gk_wrap_iov_length(OM_uint32 * minor_status, conf_req_flag, qop_req, conf_state, iov, iov_count); - return GSS_S_FAILURE; + HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); + ret = _gsskrb5i_get_token_key(ctx, context, &key); + HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); + if (ret) { + *minor_status = ret; + return GSS_S_FAILURE; + } + krb5_enctype_to_keytype(context, key->keytype, &keytype); + + switch (keytype) { + case KEYTYPE_ARCFOUR: + case KEYTYPE_ARCFOUR_56: + ret = _gssapi_wrap_iov_length_arcfour(minor_status, ctx, context, + conf_req_flag, qop_req, conf_state, + iov, iov_count); + break; + + default: + ret = GSS_S_FAILURE; + break; + } + + krb5_free_keyblock(context, key); + return ret; } diff --git a/source4/heimdal/lib/gssapi/krb5/arcfour.c b/source4/heimdal/lib/gssapi/krb5/arcfour.c index 13bf1d34653..a61f7686e95 100644 --- a/source4/heimdal/lib/gssapi/krb5/arcfour.c +++ b/source4/heimdal/lib/gssapi/krb5/arcfour.c @@ -824,3 +824,562 @@ _gssapi_wrap_size_arcfour(OM_uint32 *minor_status, return GSS_S_COMPLETE; } + +OM_uint32 +_gssapi_wrap_iov_length_arcfour(OM_uint32 *minor_status, + gsskrb5_ctx ctx, + krb5_context context, + int conf_req_flag, + gss_qop_t qop_req, + int *conf_state, + gss_iov_buffer_desc *iov, + int iov_count) +{ + OM_uint32 major_status; + size_t data_len = 0; + int i; + gss_iov_buffer_desc *header = NULL; + gss_iov_buffer_desc *padding = NULL; + gss_iov_buffer_desc *trailer = NULL; + + *minor_status = 0; + + for (i = 0; i < iov_count; i++) { + switch(GSS_IOV_BUFFER_TYPE(iov[i].type)) { + case GSS_IOV_BUFFER_TYPE_EMPTY: + break; + case GSS_IOV_BUFFER_TYPE_DATA: + data_len += iov[i].buffer.length; + break; + case GSS_IOV_BUFFER_TYPE_HEADER: + if (header != NULL) { + *minor_status = EINVAL; + return GSS_S_FAILURE; + } + header = &iov[i]; + break; + case GSS_IOV_BUFFER_TYPE_TRAILER: + if (trailer != NULL) { + *minor_status = EINVAL; + return GSS_S_FAILURE; + } + trailer = &iov[i]; + break; + case GSS_IOV_BUFFER_TYPE_PADDING: + if (padding != NULL) { + *minor_status = EINVAL; + return GSS_S_FAILURE; + } + padding = &iov[i]; + break; + case GSS_IOV_BUFFER_TYPE_SIGN_ONLY: + break; + default: + *minor_status = EINVAL; + return GSS_S_FAILURE; + } + } + + major_status = _gk_verify_buffers(minor_status, ctx, header, padding, trailer); + if (major_status != GSS_S_COMPLETE) { + return major_status; + } + + if (IS_DCE_STYLE(ctx)) { + size_t len = GSS_ARCFOUR_WRAP_TOKEN_SIZE; + size_t total_len; + _gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM); + header->buffer.length = total_len; + } else { + size_t len; + size_t total_len; + if (padding) { + data_len += 1; /* padding */ + } + len = data_len + GSS_ARCFOUR_WRAP_TOKEN_SIZE; + _gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM); + header->buffer.length = total_len - data_len; + } + + if (trailer) { + trailer->buffer.length = 0; + } + + if (padding) { + padding->buffer.length = 1; + } + + return GSS_S_COMPLETE; +} + +OM_uint32 +_gssapi_wrap_iov_arcfour(OM_uint32 *minor_status, + gsskrb5_ctx ctx, + krb5_context context, + int conf_req_flag, + int *conf_state, + gss_iov_buffer_desc *iov, + int iov_count, + krb5_keyblock *key) +{ + OM_uint32 major_status, junk; + gss_iov_buffer_desc *header, *padding, *trailer; + krb5_error_code kret; + int32_t seq_number; + u_char Klocaldata[16], k6_data[16], *p, *p0; + size_t make_len = 0; + size_t header_len = 0; + size_t data_len = 0; + krb5_keyblock Klocal; + int i; + + header = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER); + padding = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING); + trailer = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER); + + major_status = _gk_verify_buffers(minor_status, ctx, header, padding, trailer); + if (major_status != GSS_S_COMPLETE) { + return major_status; + } + + for (i = 0; i < iov_count; i++) { + switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) { + case GSS_IOV_BUFFER_TYPE_DATA: + break; + default: + continue; + } + + data_len += iov[i].buffer.length; + } + + if (padding) { + data_len += 1; + } + + if (IS_DCE_STYLE(ctx)) { + size_t unwrapped_len; + unwrapped_len = GSS_ARCFOUR_WRAP_TOKEN_SIZE; + _gssapi_encap_length(unwrapped_len, + &make_len, + &header_len, + GSS_KRB5_MECHANISM); + } else { + size_t unwrapped_len; + unwrapped_len = GSS_ARCFOUR_WRAP_TOKEN_SIZE + data_len; + _gssapi_encap_length(unwrapped_len, + &make_len, + &header_len, + GSS_KRB5_MECHANISM); + header_len -= data_len; + } + + if (GSS_IOV_BUFFER_FLAGS(header->type) & GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATE) { + major_status = _gk_allocate_buffer(minor_status, header, + header_len); + if (major_status != GSS_S_COMPLETE) + goto failure; + } else if (header->buffer.length < header_len) { + *minor_status = KRB5_BAD_MSIZE; + major_status = GSS_S_FAILURE; + goto failure; + } else { + header->buffer.length = header_len; + } + + if (padding) { + if (GSS_IOV_BUFFER_FLAGS(padding->type) & GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATE) { + major_status = _gk_allocate_buffer(minor_status, padding, 1); + if (major_status != GSS_S_COMPLETE) + goto failure; + } else if (padding->buffer.length < 1) { + *minor_status = KRB5_BAD_MSIZE; + major_status = GSS_S_FAILURE; + goto failure; + } else { + padding->buffer.length = 1; + } + memset(padding->buffer.value, 1, 1); + } + + if (trailer) { + trailer->buffer.length = 0; + trailer->buffer.value = NULL; + } + + p0 = _gssapi_make_mech_header(header->buffer.value, + make_len, + GSS_KRB5_MECHANISM); + p = p0; + + *p++ = 0x02; /* TOK_ID */ + *p++ = 0x01; + *p++ = 0x11; /* SGN_ALG */ + *p++ = 0x00; + if (conf_req_flag) { + *p++ = 0x10; /* SEAL_ALG */ + *p++ = 0x00; + } else { + *p++ = 0xff; /* SEAL_ALG */ + *p++ = 0xff; + } + *p++ = 0xff; /* Filler */ + *p++ = 0xff; + + p = NULL; + + HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); + krb5_auth_con_getlocalseqnumber(context, + ctx->auth_context, + &seq_number); + _gsskrb5_encode_be_om_uint32(seq_number, p0 + 8); + + krb5_auth_con_setlocalseqnumber(context, + ctx->auth_context, + ++seq_number); + HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); + + memset(p0 + 8 + 4, + (ctx->more_flags & LOCAL) ? 0 : 0xff, + 4); + + krb5_generate_random_block(p0 + 24, 8); /* fill in Confounder */ + + /* Sign Data */ + kret = arcfour_mic_cksum_iov(context, + key, KRB5_KU_USAGE_SEAL, + p0 + 16, 8, /* SGN_CKSUM */ + p0, 8, /* TOK_ID, SGN_ALG, SEAL_ALG, Filler */ + p0 + 24, 8, /* Confounder */ + iov, iov_count, /* Data + SignOnly */ + padding); /* padding */ + if (kret) { + *minor_status = kret; + major_status = GSS_S_FAILURE; + goto failure; + } + + Klocal.keytype = key->keytype; + Klocal.keyvalue.data = Klocaldata; + Klocal.keyvalue.length = sizeof(Klocaldata); + + for (i = 0; i < 16; i++) { + Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0; + } + kret = arcfour_mic_key(context, &Klocal, + p0 + 8, 4, /* SND_SEQ */ + k6_data, sizeof(k6_data)); + memset(Klocaldata, 0, sizeof(Klocaldata)); + if (kret) { + *minor_status = kret; + major_status = GSS_S_FAILURE; + goto failure; + } + + if (conf_req_flag) { + EVP_CIPHER_CTX rc4_key; + + EVP_CIPHER_CTX_init(&rc4_key); + EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1); + + /* Confounder */ + EVP_Cipher(&rc4_key, p0 + 24, p0 + 24, 8); + + /* Seal Data */ + for (i=0; i < iov_count; i++) { + switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) { + case GSS_IOV_BUFFER_TYPE_DATA: + break; + default: + continue; + } + + EVP_Cipher(&rc4_key, iov[i].buffer.value, + iov[i].buffer.value, iov[i].buffer.length); + } + + /* Padding */ + if (padding) { + EVP_Cipher(&rc4_key, padding->buffer.value, + padding->buffer.value, padding->buffer.length); + } + + EVP_CIPHER_CTX_cleanup(&rc4_key); + } + memset(k6_data, 0, sizeof(k6_data)); + + kret = arcfour_mic_key(context, key, + p0 + 16, 8, /* SGN_CKSUM */ + k6_data, sizeof(k6_data)); + if (kret) { + *minor_status = kret; + major_status = GSS_S_FAILURE; + } + + { + EVP_CIPHER_CTX rc4_key; + + EVP_CIPHER_CTX_init(&rc4_key); + EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1); + EVP_Cipher(&rc4_key, p0 + 8, p0 + 8, 8); /* SND_SEQ */ + EVP_CIPHER_CTX_cleanup(&rc4_key); + + memset(k6_data, 0, sizeof(k6_data)); + } + + if (conf_state) + *conf_state = conf_req_flag; + + *minor_status = 0; + return GSS_S_COMPLETE; + +failure: + + gss_release_iov_buffer(&junk, iov, iov_count); + + return major_status; +} + +OM_uint32 +_gssapi_unwrap_iov_arcfour(OM_uint32 *minor_status, + gsskrb5_ctx ctx, + krb5_context context, + int *pconf_state, + gss_qop_t *pqop_state, + gss_iov_buffer_desc *iov, + int iov_count, + krb5_keyblock *key) +{ + OM_uint32 major_status; + gss_iov_buffer_desc *header, *padding, *trailer; + krb5_keyblock Klocal; + uint8_t Klocaldata[16]; + uint8_t k6_data[16], snd_seq[8], Confounder[8]; + uint8_t cksum_data[8]; + uint8_t *_p = NULL; + const uint8_t *p, *p0; + size_t verify_len = 0; + uint32_t seq_number; + size_t hlen = 0; + int conf_state; + int cmp; + size_t i; + krb5_error_code kret; + OM_uint32 ret; + + if (pconf_state != NULL) { + *pconf_state = 0; + } + if (pqop_state != NULL) { + *pqop_state = 0; + } + + header = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER); + padding = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING); + trailer = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER); + + /* Check if the packet is correct */ + major_status = _gk_verify_buffers(minor_status, + ctx, + header, + padding, + trailer); + if (major_status != GSS_S_COMPLETE) { + return major_status; + } + + if (padding != NULL && padding->buffer.length != 1) { + *minor_status = EINVAL; + return GSS_S_FAILURE; + } + + if (IS_DCE_STYLE(context)) { + verify_len = GSS_ARCFOUR_WRAP_TOKEN_SIZE + + GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE; + if (header->buffer.length > verify_len) { + return GSS_S_BAD_MECH; + } + } else { + verify_len = header->buffer.length; + } + _p = header->buffer.value; + + ret = _gssapi_verify_mech_header(&_p, + verify_len, + GSS_KRB5_MECHANISM); + if (ret) { + return ret; + } + p0 = _p; + + /* length of mech header */ + hlen = (p0 - (uint8_t *)header->buffer.value); + hlen += GSS_ARCFOUR_WRAP_TOKEN_SIZE; + + if (hlen > header->buffer.length) { + return GSS_S_BAD_MECH; + } + + p = p0; + + if (memcmp(p, "\x02\x01", 2) != 0) + return GSS_S_BAD_SIG; + p += 2; + if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */ + return GSS_S_BAD_SIG; + p += 2; + + if (memcmp (p, "\x10\x00", 2) == 0) + conf_state = 1; + else if (memcmp (p, "\xff\xff", 2) == 0) + conf_state = 0; + else + return GSS_S_BAD_SIG; + + p += 2; + if (memcmp (p, "\xff\xff", 2) != 0) + return GSS_S_BAD_MIC; + p = NULL; + + kret = arcfour_mic_key(context, + key, + p0 + 16, /* SGN_CKSUM */ + 8, /* SGN_CKSUM_LEN */ + k6_data, + sizeof(k6_data)); + if (kret) { + *minor_status = kret; + return GSS_S_FAILURE; + } + + { + EVP_CIPHER_CTX rc4_key; + + EVP_CIPHER_CTX_init(&rc4_key); + EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1); + EVP_Cipher(&rc4_key, snd_seq, p0 + 8, 8); /* SND_SEQ */ + EVP_CIPHER_CTX_cleanup(&rc4_key); + + memset(k6_data, 0, sizeof(k6_data)); + } + + _gsskrb5_decode_be_om_uint32(snd_seq, &seq_number); + + if (ctx->more_flags & LOCAL) { + cmp = memcmp(&snd_seq[4], "\xff\xff\xff\xff", 4); + } else { + cmp = memcmp(&snd_seq[4], "\x00\x00\x00\x00", 4); + } + if (cmp != 0) { + *minor_status = 0; + return GSS_S_BAD_MIC; + } + + if (ctx->more_flags & LOCAL) { + cmp = memcmp(&snd_seq[4], "\xff\xff\xff\xff", 4); + } else { + cmp = memcmp(&snd_seq[4], "\x00\x00\x00\x00", 4); + } + if (cmp != 0) { + *minor_status = 0; + return GSS_S_BAD_MIC; + } + + /* keyblock */ + Klocal.keytype = key->keytype; + Klocal.keyvalue.data = Klocaldata; + Klocal.keyvalue.length = sizeof(Klocaldata); + + for (i = 0; i < 16; i++) { + Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0; + } + + kret = arcfour_mic_key(context, + &Klocal, + snd_seq, + 4, + k6_data, sizeof(k6_data)); + memset(Klocaldata, 0, sizeof(Klocaldata)); + if (kret) { + *minor_status = kret; + return GSS_S_FAILURE; + } + + if (conf_state == 1) { + EVP_CIPHER_CTX rc4_key; + + EVP_CIPHER_CTX_init(&rc4_key); + EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1); + + /* Confounder */ + EVP_Cipher(&rc4_key, Confounder, p0 + 24, 8); + + /* Data */ + for (i = 0; i < iov_count; i++) { + switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) { + case GSS_IOV_BUFFER_TYPE_DATA: + break; + default: + continue; + } + + EVP_Cipher(&rc4_key, iov[i].buffer.value, + iov[i].buffer.value, iov[i].buffer.length); + } + + /* Padding */ + if (padding) { + EVP_Cipher(&rc4_key, padding->buffer.value, + padding->buffer.value, padding->buffer.length); + } + + EVP_CIPHER_CTX_cleanup(&rc4_key); + } else { + /* Confounder */ + memcpy(Confounder, p0 + 24, 8); + } + memset(k6_data, 0, sizeof(k6_data)); + + /* Prepare the buffer for signing */ + kret = arcfour_mic_cksum_iov(context, + key, KRB5_KU_USAGE_SEAL, + cksum_data, sizeof(cksum_data), + p0, 8, + Confounder, sizeof(Confounder), + iov, iov_count, + padding); + if (kret) { + *minor_status = kret; + return GSS_S_FAILURE; + } + + cmp = memcmp(cksum_data, p0 + 16, 8); /* SGN_CKSUM */ + if (cmp != 0) { + *minor_status = 0; + return GSS_S_BAD_MIC; + } + + if (padding) { + size_t plen; + + ret = _gssapi_verify_pad(&padding->buffer, 1, &plen); + if (ret) { + *minor_status = 0; + return ret; + } + } + + HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex); + ret = _gssapi_msg_order_check(ctx->order, seq_number); + HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex); + if (ret != 0) { + return ret; + } + + if (pconf_state) { + *pconf_state = conf_state; + } + + *minor_status = 0; + return GSS_S_COMPLETE; +} |