OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status, const gsskrb5_ctx context_handle, krb5_context context, const gss_buffer_t input_message_buffer, gss_buffer_t output_message_buffer, int *conf_state, gss_qop_t *qop_state, krb5_keyblock *key) { u_char Klocaldata[16]; krb5_keyblock Klocal; krb5_error_code ret; uint32_t seq_number; size_t datalen; OM_uint32 omret; u_char k6_data[16], SND_SEQ[8], Confounder[8]; u_char cksum_data[8]; u_char *p, *p0; int cmp; int conf_flag; size_t padlen = 0, len; if (conf_state) *conf_state = 0; if (qop_state) *qop_state = 0; p0 = input_message_buffer->value; if (IS_DCE_STYLE(context_handle)) { len = GSS_ARCFOUR_WRAP_TOKEN_SIZE + GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE; if (input_message_buffer->length < len) return GSS_S_BAD_MECH; } else { len = input_message_buffer->length; } omret = _gssapi_verify_mech_header(&p0, len, GSS_KRB5_MECHANISM); if (omret) return omret; /* length of mech header */ len = (p0 - (u_char *)input_message_buffer->value) + GSS_ARCFOUR_WRAP_TOKEN_SIZE; if (len > input_message_buffer->length) return GSS_S_BAD_MECH; /* length of data */ datalen = input_message_buffer->length - len; 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_flag = 1; else if (memcmp (p, "\xff\xff", 2) == 0) conf_flag = 0; else return GSS_S_BAD_SIG; p += 2; if (memcmp (p, "\xff\xff", 2) != 0) return GSS_S_BAD_MIC; p = NULL; ret = arcfour_mic_key(context, key, p0 + 16, 8, /* SGN_CKSUM */ k6_data, sizeof(k6_data)); if (ret) { *minor_status = ret; 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); EVP_CIPHER_CTX_cleanup(&rc4_key); memset(k6_data, 0, sizeof(k6_data)); } _gss_mg_decode_be_uint32(SND_SEQ, &seq_number); if (context_handle->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; } { int i; 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; } ret = arcfour_mic_key(context, &Klocal, SND_SEQ, 4, k6_data, sizeof(k6_data)); memset(Klocaldata, 0, sizeof(Klocaldata)); if (ret) { *minor_status = ret; return GSS_S_FAILURE; } output_message_buffer->value = malloc(datalen); if (output_message_buffer->value == NULL) { *minor_status = ENOMEM; return GSS_S_FAILURE; } output_message_buffer->length = datalen; if(conf_flag) { 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, Confounder, p0 + 24, 8); EVP_Cipher(&rc4_key, output_message_buffer->value, p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE, datalen); EVP_CIPHER_CTX_cleanup(&rc4_key); } else { memcpy(Confounder, p0 + 24, 8); /* Confounder */ memcpy(output_message_buffer->value, p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE, datalen); } memset(k6_data, 0, sizeof(k6_data)); if (!IS_DCE_STYLE(context_handle)) { ret = _gssapi_verify_pad(output_message_buffer, datalen, &padlen); if (ret) { _gsskrb5_release_buffer(minor_status, output_message_buffer); *minor_status = 0; return ret; } output_message_buffer->length -= padlen; } ret = arcfour_mic_cksum(context, key, KRB5_KU_USAGE_SEAL, cksum_data, sizeof(cksum_data), p0, 8, Confounder, sizeof(Confounder), output_message_buffer->value, output_message_buffer->length + padlen); if (ret) { _gsskrb5_release_buffer(minor_status, output_message_buffer); *minor_status = ret; return GSS_S_FAILURE; } cmp = ct_memcmp(cksum_data, p0 + 16, 8); /* SGN_CKSUM */ if (cmp) { _gsskrb5_release_buffer(minor_status, output_message_buffer); *minor_status = 0; return GSS_S_BAD_MIC; } HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex); omret = _gssapi_msg_order_check(context_handle->gk5c.order, seq_number); HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex); if (omret) return omret; if (conf_state) *conf_state = conf_flag; *minor_status = 0; return GSS_S_COMPLETE; }
OM_uint32 _gssapi_wrap_arcfour(OM_uint32 * minor_status, const gsskrb5_ctx context_handle, krb5_context context, int conf_req_flag, gss_qop_t qop_req, const gss_buffer_t input_message_buffer, int * conf_state, gss_buffer_t output_message_buffer, krb5_keyblock *key) { u_char Klocaldata[16], k6_data[16], *p, *p0; size_t len, total_len, datalen; krb5_keyblock Klocal; krb5_error_code ret; int32_t seq_number; if (conf_state) *conf_state = 0; datalen = input_message_buffer->length; if (IS_DCE_STYLE(context_handle)) { len = GSS_ARCFOUR_WRAP_TOKEN_SIZE; _gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM); total_len += datalen; } else { datalen += 1; /* padding */ len = datalen + GSS_ARCFOUR_WRAP_TOKEN_SIZE; _gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM); } output_message_buffer->length = total_len; output_message_buffer->value = malloc (total_len); if (output_message_buffer->value == NULL) { *minor_status = ENOMEM; return GSS_S_FAILURE; } p0 = _gssapi_make_mech_header(output_message_buffer->value, 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(&context_handle->ctx_id_mutex); krb5_auth_con_getlocalseqnumber (context, context_handle->auth_context, &seq_number); _gss_mg_encode_be_uint32(seq_number, p0 + 8); krb5_auth_con_setlocalseqnumber (context, context_handle->auth_context, ++seq_number); HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex); memset (p0 + 8 + 4, (context_handle->more_flags & LOCAL) ? 0 : 0xff, 4); krb5_generate_random_block(p0 + 24, 8); /* fill in Confounder */ /* p points to data */ p = p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE; memcpy(p, input_message_buffer->value, input_message_buffer->length); if (!IS_DCE_STYLE(context_handle)) p[input_message_buffer->length] = 1; /* padding */ ret = arcfour_mic_cksum(context, key, KRB5_KU_USAGE_SEAL, p0 + 16, 8, /* SGN_CKSUM */ p0, 8, /* TOK_ID, SGN_ALG, SEAL_ALG, Filler */ p0 + 24, 8, /* Confounder */ p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE, datalen); if (ret) { *minor_status = ret; _gsskrb5_release_buffer(minor_status, output_message_buffer); return GSS_S_FAILURE; } { int i; 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; } ret = arcfour_mic_key(context, &Klocal, p0 + 8, 4, /* SND_SEQ */ k6_data, sizeof(k6_data)); memset(Klocaldata, 0, sizeof(Klocaldata)); if (ret) { _gsskrb5_release_buffer(minor_status, output_message_buffer); *minor_status = ret; return GSS_S_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); EVP_Cipher(&rc4_key, p0 + 24, p0 + 24, 8 + datalen); EVP_CIPHER_CTX_cleanup(&rc4_key); } memset(k6_data, 0, sizeof(k6_data)); ret = arcfour_mic_key(context, key, p0 + 16, 8, /* SGN_CKSUM */ k6_data, sizeof(k6_data)); if (ret) { _gsskrb5_release_buffer(minor_status, output_message_buffer); *minor_status = ret; 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, p0 + 8, p0 + 8 /* SND_SEQ */, 8); 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; }
OM_uint32 _gssapi_verify_mic_arcfour(OM_uint32 * minor_status, const gsskrb5_ctx context_handle, krb5_context context, const gss_buffer_t message_buffer, const gss_buffer_t token_buffer, gss_qop_t * qop_state, krb5_keyblock *key, const char *type) { krb5_error_code ret; uint32_t seq_number; OM_uint32 omret; u_char SND_SEQ[8], cksum_data[8], *p; char k6_data[16]; int cmp; if (qop_state) *qop_state = 0; p = token_buffer->value; omret = _gsskrb5_verify_header (&p, token_buffer->length, type, GSS_KRB5_MECHANISM); if (omret) return omret; if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */ return GSS_S_BAD_SIG; p += 2; if (memcmp (p, "\xff\xff\xff\xff", 4) != 0) return GSS_S_BAD_MIC; p += 4; ret = arcfour_mic_cksum(context, key, KRB5_KU_USAGE_SIGN, cksum_data, sizeof(cksum_data), p - 8, 8, message_buffer->value, message_buffer->length, NULL, 0); if (ret) { *minor_status = ret; return GSS_S_FAILURE; } ret = arcfour_mic_key(context, key, cksum_data, sizeof(cksum_data), k6_data, sizeof(k6_data)); if (ret) { *minor_status = ret; return GSS_S_FAILURE; } cmp = ct_memcmp(cksum_data, p + 8, 8); if (cmp) { *minor_status = 0; return GSS_S_BAD_MIC; } { EVP_CIPHER_CTX rc4_key; EVP_CIPHER_CTX_init(&rc4_key); EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, (void *)k6_data, NULL, 0); EVP_Cipher(&rc4_key, SND_SEQ, p, 8); EVP_CIPHER_CTX_cleanup(&rc4_key); memset(k6_data, 0, sizeof(k6_data)); } _gss_mg_decode_be_uint32(SND_SEQ, &seq_number); if (context_handle->more_flags & LOCAL) cmp = memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4); else cmp = memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4); memset(SND_SEQ, 0, sizeof(SND_SEQ)); if (cmp != 0) { *minor_status = 0; return GSS_S_BAD_MIC; } HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex); omret = _gssapi_msg_order_check(context_handle->gk5c.order, seq_number); HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex); if (omret) return omret; *minor_status = 0; return GSS_S_COMPLETE; }
OM_uint32 _gssapi_get_mic_arcfour(OM_uint32 * minor_status, const gsskrb5_ctx context_handle, krb5_context context, gss_qop_t qop_req, const gss_buffer_t message_buffer, gss_buffer_t message_token, krb5_keyblock *key) { krb5_error_code ret; int32_t seq_number; size_t len, total_len; u_char k6_data[16], *p0, *p; EVP_CIPHER_CTX rc4_key; _gsskrb5_encap_length (22, &len, &total_len, GSS_KRB5_MECHANISM); message_token->length = total_len; message_token->value = malloc (total_len); if (message_token->value == NULL) { *minor_status = ENOMEM; return GSS_S_FAILURE; } p0 = _gssapi_make_mech_header(message_token->value, len, GSS_KRB5_MECHANISM); p = p0; *p++ = 0x01; /* TOK_ID */ *p++ = 0x01; *p++ = 0x11; /* SGN_ALG */ *p++ = 0x00; *p++ = 0xff; /* Filler */ *p++ = 0xff; *p++ = 0xff; *p++ = 0xff; p = NULL; ret = arcfour_mic_cksum(context, key, KRB5_KU_USAGE_SIGN, p0 + 16, 8, /* SGN_CKSUM */ p0, 8, /* TOK_ID, SGN_ALG, Filer */ message_buffer->value, message_buffer->length, NULL, 0); if (ret) { _gsskrb5_release_buffer(minor_status, message_token); *minor_status = ret; return GSS_S_FAILURE; } ret = arcfour_mic_key(context, key, p0 + 16, 8, /* SGN_CKSUM */ k6_data, sizeof(k6_data)); if (ret) { _gsskrb5_release_buffer(minor_status, message_token); *minor_status = ret; return GSS_S_FAILURE; } HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex); krb5_auth_con_getlocalseqnumber (context, context_handle->auth_context, &seq_number); p = p0 + 8; /* SND_SEQ */ _gss_mg_encode_be_uint32(seq_number, p); krb5_auth_con_setlocalseqnumber (context, context_handle->auth_context, ++seq_number); HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex); memset (p + 4, (context_handle->more_flags & LOCAL) ? 0 : 0xff, 4); EVP_CIPHER_CTX_init(&rc4_key); EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1); EVP_Cipher(&rc4_key, p, p, 8); EVP_CIPHER_CTX_cleanup(&rc4_key); memset(k6_data, 0, sizeof(k6_data)); *minor_status = 0; return GSS_S_COMPLETE; }
OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status, const gss_ctx_id_t context_handle, const gss_buffer_t input_message_buffer, gss_buffer_t output_message_buffer, int *conf_state, gss_qop_t *qop_state, krb5_keyblock *key) { u_char Klocaldata[16]; krb5_keyblock Klocal; krb5_error_code ret; int32_t seq_number; size_t datalen; OM_uint32 omret; char k6_data[16], SND_SEQ[8], Confounder[8]; char cksum_data[8]; u_char *p, *p0; int cmp; int conf_flag; size_t padlen; if (conf_state) *conf_state = 0; if (qop_state) *qop_state = 0; p0 = input_message_buffer->value; omret = _gssapi_verify_mech_header(&p0, input_message_buffer->length, GSS_KRB5_MECHANISM); if (omret) return omret; p = p0; datalen = input_message_buffer->length - (p - ((u_char *)input_message_buffer->value)) - GSS_ARCFOUR_WRAP_TOKEN_SIZE; 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_flag = 1; else if (memcmp (p, "\xff\xff", 2) == 0) conf_flag = 0; else return GSS_S_BAD_SIG; p += 2; if (memcmp (p, "\xff\xff", 2) != 0) return GSS_S_BAD_MIC; p = NULL; ret = arcfour_mic_key(gssapi_krb5_context, key, p0 + 16, 8, /* SGN_CKSUM */ k6_data, sizeof(k6_data)); if (ret) { *minor_status = ret; return GSS_S_FAILURE; } { RC4_KEY rc4_key; RC4_set_key (&rc4_key, sizeof(k6_data), k6_data); RC4 (&rc4_key, 8, p0 + 8, SND_SEQ); /* SND_SEQ */ memset(&rc4_key, 0, sizeof(rc4_key)); memset(k6_data, 0, sizeof(k6_data)); } gssapi_decode_be_om_uint32(SND_SEQ, &seq_number); if (context_handle->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; } { int i; 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; } ret = arcfour_mic_key(gssapi_krb5_context, &Klocal, SND_SEQ, 4, k6_data, sizeof(k6_data)); memset(Klocaldata, 0, sizeof(Klocaldata)); if (ret) { *minor_status = ret; return GSS_S_FAILURE; } output_message_buffer->value = malloc(datalen); if (output_message_buffer->value == NULL) { *minor_status = ENOMEM; return GSS_S_FAILURE; } output_message_buffer->length = datalen; if(conf_flag) { RC4_KEY rc4_key; RC4_set_key (&rc4_key, sizeof(k6_data), k6_data); RC4 (&rc4_key, 8, p0 + 24, Confounder); /* Confounder */ RC4 (&rc4_key, datalen, p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE, output_message_buffer->value); memset(&rc4_key, 0, sizeof(rc4_key)); } else { memcpy(Confounder, p0 + 24, 8); /* Confounder */ memcpy(output_message_buffer->value, p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE, datalen); } memset(k6_data, 0, sizeof(k6_data)); ret = _gssapi_verify_pad(output_message_buffer, datalen, &padlen); if (ret) { gss_release_buffer(minor_status, output_message_buffer); *minor_status = 0; return ret; } output_message_buffer->length -= padlen; ret = arcfour_mic_cksum(key, KRB5_KU_USAGE_SEAL, cksum_data, sizeof(cksum_data), p0, 8, Confounder, sizeof(Confounder), output_message_buffer->value, output_message_buffer->length + padlen); if (ret) { gss_release_buffer(minor_status, output_message_buffer); *minor_status = ret; return GSS_S_FAILURE; } cmp = memcmp(cksum_data, p0 + 16, 8); /* SGN_CKSUM */ if (cmp) { gss_release_buffer(minor_status, output_message_buffer); *minor_status = 0; return GSS_S_BAD_MIC; } HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex); omret = _gssapi_msg_order_check(context_handle->order, seq_number); HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex); if (omret) return omret; if (conf_state) *conf_state = conf_flag; *minor_status = 0; return GSS_S_COMPLETE; }
OM_uint32 _gssapi_verify_mic_arcfour(OM_uint32 * minor_status, const gss_ctx_id_t context_handle, const gss_buffer_t message_buffer, const gss_buffer_t token_buffer, gss_qop_t * qop_state, krb5_keyblock *key, char *type) { krb5_error_code ret; int32_t seq_number; OM_uint32 omret; char cksum_data[8], k6_data[16], SND_SEQ[8]; u_char *p; int cmp; if (qop_state) *qop_state = 0; p = token_buffer->value; omret = gssapi_krb5_verify_header (&p, token_buffer->length, type, GSS_KRB5_MECHANISM); if (omret) return omret; if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */ return GSS_S_BAD_SIG; p += 2; if (memcmp (p, "\xff\xff\xff\xff", 4) != 0) return GSS_S_BAD_MIC; p += 4; ret = arcfour_mic_cksum(key, KRB5_KU_USAGE_SIGN, cksum_data, sizeof(cksum_data), p - 8, 8, message_buffer->value, message_buffer->length, NULL, 0); if (ret) { *minor_status = ret; return GSS_S_FAILURE; } ret = arcfour_mic_key(gssapi_krb5_context, key, cksum_data, sizeof(cksum_data), k6_data, sizeof(k6_data)); if (ret) { *minor_status = ret; return GSS_S_FAILURE; } cmp = memcmp(cksum_data, p + 8, 8); if (cmp) { *minor_status = 0; return GSS_S_BAD_MIC; } { RC4_KEY rc4_key; RC4_set_key (&rc4_key, sizeof(k6_data), k6_data); RC4 (&rc4_key, 8, p, SND_SEQ); memset(&rc4_key, 0, sizeof(rc4_key)); memset(k6_data, 0, sizeof(k6_data)); } gssapi_decode_be_om_uint32(SND_SEQ, &seq_number); if (context_handle->more_flags & LOCAL) cmp = memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4); else cmp = memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4); memset(SND_SEQ, 0, sizeof(SND_SEQ)); if (cmp != 0) { *minor_status = 0; return GSS_S_BAD_MIC; } HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex); omret = _gssapi_msg_order_check(context_handle->order, seq_number); HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex); if (omret) return omret; *minor_status = 0; return GSS_S_COMPLETE; }