/* parsing packets: formats and tools * Copyright (C) 1997 Angelos D. Keromytis. * Copyright (C) 1998-2001 D. Hugh Redelmeier. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. See . * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. */ #include #include #include #include #include #include #include "constants.h" #include "defs.h" #include "log.h" #include "packet.h" #include "whack.h" /* for RC_LOG_SERIOUS */ /* ISAKMP Header: for all messages * layout from RFC 2408 "ISAKMP" section 3.1 * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Initiator ! * ! Cookie ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Responder ! * ! Cookie ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! MjVer ! MnVer ! Exchange Type ! Flags ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Message ID ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isa_fields[] = { { ft_raw, COOKIE_SIZE, "initiator cookie", NULL }, { ft_raw, COOKIE_SIZE, "responder cookie", NULL }, { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_enum, 8/BITS_PER_BYTE, "ISAKMP version", &version_names }, { ft_enum, 8/BITS_PER_BYTE, "exchange type", &exchange_names }, { ft_set, 8/BITS_PER_BYTE, "flags", flag_bit_names }, { ft_raw, 32/BITS_PER_BYTE, "message ID", NULL }, { ft_len, 32/BITS_PER_BYTE, "length", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_hdr_desc = { "ISAKMP Message", isa_fields, sizeof(struct isakmp_hdr) }; /* Generic portion of all ISAKMP payloads. * layout from RFC 2408 "ISAKMP" section 3.2 * This describes the first 32-bit chunk of all payloads. * The previous next payload depends on the actual payload type. * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isag_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_generic_desc = { "ISAKMP Generic Payload", isag_fields, sizeof(struct isakmp_generic) }; /* ISAKMP Data Attribute (generic representation within payloads) * layout from RFC 2408 "ISAKMP" section 3.3 * This is not a payload type. * In TLV format, this is followed by a value field. * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * !A! Attribute Type ! AF=0 Attribute Length ! * !F! ! AF=1 Attribute Value ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * . AF=0 Attribute Value . * . AF=1 Not Transmitted . * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /* Oakley Attributes */ static field_desc isaat_fields_oakley[] = { { ft_af_enum, 16/BITS_PER_BYTE, "af+type", &oakley_attr_names }, { ft_lv, 16/BITS_PER_BYTE, "length/value", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_oakley_attribute_desc = { "ISAKMP Oakley attribute", isaat_fields_oakley, sizeof(struct isakmp_attribute) }; /* IPsec DOI Attributes */ static field_desc isaat_fields_ipsec[] = { { ft_af_enum, 16/BITS_PER_BYTE, "af+type", &ipsec_attr_names }, { ft_lv, 16/BITS_PER_BYTE, "length/value", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_ipsec_attribute_desc = { "ISAKMP IPsec DOI attribute", isaat_fields_ipsec, sizeof(struct isakmp_attribute) }; /* Mode Config Attributes */ static field_desc isaat_fields_modecfg[] = { { ft_af_loose_enum, 16/BITS_PER_BYTE, "ModeCfg attr type", &modecfg_attr_names }, { ft_lv, 16/BITS_PER_BYTE, "length/value", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_modecfg_attribute_desc = { "ISAKMP ModeCfg attribute", isaat_fields_modecfg, sizeof(struct isakmp_attribute) }; /* ISAKMP Security Association Payload * layout from RFC 2408 "ISAKMP" section 3.4 * A variable length Situation follows. * Previous next payload: ISAKMP_NEXT_SA * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Domain of Interpretation (DOI) ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Situation ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isasa_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 32/BITS_PER_BYTE, "DOI", &doi_names }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_sa_desc = { "ISAKMP Security Association Payload", isasa_fields, sizeof(struct isakmp_sa) }; static field_desc ipsec_sit_field[] = { { ft_set, 32/BITS_PER_BYTE, "IPsec DOI SIT", &sit_bit_names }, { ft_end, 0, NULL, NULL } }; struct_desc ipsec_sit_desc = { "IPsec DOI SIT", ipsec_sit_field, sizeof(u_int32_t) }; /* ISAKMP Proposal Payload * layout from RFC 2408 "ISAKMP" section 3.5 * A variable length SPI follows. * Previous next payload: ISAKMP_NEXT_P * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Proposal # ! Protocol-Id ! SPI Size !# of Transforms! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! SPI (variable) ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isap_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_nat, 8/BITS_PER_BYTE, "proposal number", NULL }, { ft_enum, 8/BITS_PER_BYTE, "protocol ID", &protocol_names }, { ft_nat, 8/BITS_PER_BYTE, "SPI size", NULL }, { ft_nat, 8/BITS_PER_BYTE, "number of transforms", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_proposal_desc = { "ISAKMP Proposal Payload", isap_fields, sizeof(struct isakmp_proposal) }; /* ISAKMP Transform Payload * layout from RFC 2408 "ISAKMP" section 3.6 * Variable length SA Attributes follow. * Previous next payload: ISAKMP_NEXT_T * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Transform # ! Transform-Id ! RESERVED2 ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ SA Attributes ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /* PROTO_ISAKMP */ static field_desc isat_fields_isakmp[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_nat, 8/BITS_PER_BYTE, "transform number", NULL }, { ft_enum, 8/BITS_PER_BYTE, "transform ID", &isakmp_transformid_names }, { ft_mbz, 16/BITS_PER_BYTE, NULL, NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_isakmp_transform_desc = { "ISAKMP Transform Payload (ISAKMP)", isat_fields_isakmp, sizeof(struct isakmp_transform) }; /* PROTO_IPSEC_AH */ static field_desc isat_fields_ah[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_nat, 8/BITS_PER_BYTE, "transform number", NULL }, { ft_enum, 8/BITS_PER_BYTE, "transform ID", &ah_transform_names }, { ft_mbz, 16/BITS_PER_BYTE, NULL, NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_ah_transform_desc = { "ISAKMP Transform Payload (AH)", isat_fields_ah, sizeof(struct isakmp_transform) }; /* PROTO_IPSEC_ESP */ static field_desc isat_fields_esp[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_nat, 8/BITS_PER_BYTE, "transform number", NULL }, { ft_enum, 8/BITS_PER_BYTE, "transform ID", &esp_transform_names }, { ft_mbz, 16/BITS_PER_BYTE, NULL, NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_esp_transform_desc = { "ISAKMP Transform Payload (ESP)", isat_fields_esp, sizeof(struct isakmp_transform) }; /* PROTO_IPCOMP */ static field_desc isat_fields_ipcomp[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_nat, 8/BITS_PER_BYTE, "transform number", NULL }, { ft_enum, 8/BITS_PER_BYTE, "transform ID", &ipcomp_transformid_names }, { ft_mbz, 16/BITS_PER_BYTE, NULL, NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_ipcomp_transform_desc = { "ISAKMP Transform Payload (COMP)", isat_fields_ipcomp, sizeof(struct isakmp_transform) }; /* ISAKMP Key Exchange Payload: no fixed fields beyond the generic ones. * layout from RFC 2408 "ISAKMP" section 3.7 * Variable Key Exchange Data follow the generic fields. * Previous next payload: ISAKMP_NEXT_KE * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Key Exchange Data ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct_desc isakmp_keyex_desc = { "ISAKMP Key Exchange Payload", isag_fields, sizeof(struct isakmp_generic) }; /* ISAKMP Identification Payload * layout from RFC 2408 "ISAKMP" section 3.8 * See "struct identity" declared later. * Variable length Identification Data follow. * Previous next payload: ISAKMP_NEXT_ID * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ID Type ! DOI Specific ID Data ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Identification Data ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isaid_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 8/BITS_PER_BYTE, "ID type", &ident_names }, /* ??? depends on DOI? */ { ft_nat, 8/BITS_PER_BYTE, "DOI specific A", NULL }, /* ??? depends on DOI? */ { ft_nat, 16/BITS_PER_BYTE, "DOI specific B", NULL }, /* ??? depends on DOI? */ { ft_end, 0, NULL, NULL } }; struct_desc isakmp_identification_desc = { "ISAKMP Identification Payload", isaid_fields, sizeof(struct isakmp_id) }; /* IPSEC Identification Payload Content * layout from RFC 2407 "IPsec DOI" section 4.6.2 * See struct isakmp_id declared earlier. * Note: Hashing skips the ISAKMP generic payload header * Variable length Identification Data follow. * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ID Type ! Protocol ID ! Port ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ~ Identification Data ~ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isaiid_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 8/BITS_PER_BYTE, "ID type", &ident_names }, { ft_nat, 8/BITS_PER_BYTE, "Protocol ID", NULL }, /* ??? UDP/TCP or 0? */ { ft_nat, 16/BITS_PER_BYTE, "port", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_ipsec_identification_desc = { "ISAKMP Identification Payload (IPsec DOI)", isaiid_fields, sizeof(struct isakmp_ipsec_id) }; /* ISAKMP Certificate Payload: oddball fixed field beyond the generic ones. * layout from RFC 2408 "ISAKMP" section 3.9 * Variable length Certificate Data follow the generic fields. * Previous next payload: ISAKMP_NEXT_CERT. * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Cert Encoding ! ! * +-+-+-+-+-+-+-+-+ ! * ~ Certificate Data ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isacert_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 8/BITS_PER_BYTE, "cert encoding", &cert_type_names }, { ft_end, 0, NULL, NULL } }; /* Note: the size field of isakmp_ipsec_certificate_desc cannot be * sizeof(struct isakmp_cert) because that will rounded up for padding. */ struct_desc isakmp_ipsec_certificate_desc = { "ISAKMP Certificate Payload", isacert_fields, ISAKMP_CERT_SIZE }; /* ISAKMP Certificate Request Payload: oddball field beyond the generic ones. * layout from RFC 2408 "ISAKMP" section 3.10 * Variable length Certificate Types and Certificate Authorities follow. * Previous next payload: ISAKMP_NEXT_CR. * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Cert. Type ! ! * +-+-+-+-+-+-+-+-+ ! * ~ Certificate Authority ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isacr_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 8/BITS_PER_BYTE, "cert type", &cert_type_names }, { ft_end, 0, NULL, NULL } }; /* Note: the size field of isakmp_ipsec_cert_req_desc cannot be * sizeof(struct isakmp_cr) because that will rounded up for padding. */ struct_desc isakmp_ipsec_cert_req_desc = { "ISAKMP Certificate RequestPayload", isacr_fields, ISAKMP_CR_SIZE }; /* ISAKMP Hash Payload: no fixed fields beyond the generic ones. * layout from RFC 2408 "ISAKMP" section 3.11 * Variable length Hash Data follow. * Previous next payload: ISAKMP_NEXT_HASH. * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Hash Data ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct_desc isakmp_hash_desc = { "ISAKMP Hash Payload", isag_fields, sizeof(struct isakmp_generic) }; /* ISAKMP Signature Payload: no fixed fields beyond the generic ones. * layout from RFC 2408 "ISAKMP" section 3.12 * Variable length Signature Data follow. * Previous next payload: ISAKMP_NEXT_SIG. * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Signature Data ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct_desc isakmp_signature_desc = { "ISAKMP Signature Payload", isag_fields, sizeof(struct isakmp_generic) }; /* ISAKMP Nonce Payload: no fixed fields beyond the generic ones. * layout from RFC 2408 "ISAKMP" section 3.13 * Variable length Nonce Data follow. * Previous next payload: ISAKMP_NEXT_NONCE. * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Nonce Data ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct_desc isakmp_nonce_desc = { "ISAKMP Nonce Payload", isag_fields, sizeof(struct isakmp_generic) }; /* ISAKMP Notification Payload * layout from RFC 2408 "ISAKMP" section 3.14 * This is followed by a variable length SPI * and then possibly by variable length Notification Data. * Previous next payload: ISAKMP_NEXT_N * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Domain of Interpretation (DOI) ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Protocol-ID ! SPI Size ! Notify Message Type ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Security Parameter Index (SPI) ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Notification Data ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isan_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 32/BITS_PER_BYTE, "DOI", &doi_names }, { ft_nat, 8/BITS_PER_BYTE, "protocol ID", NULL }, /* ??? really enum: ISAKMP, IPSEC, ESP, ... */ { ft_nat, 8/BITS_PER_BYTE, "SPI size", NULL }, { ft_enum, 16/BITS_PER_BYTE, "Notify Message Type", ¬ification_names }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_notification_desc = { "ISAKMP Notification Payload", isan_fields, sizeof(struct isakmp_notification) }; /* ISAKMP Delete Payload * layout from RFC 2408 "ISAKMP" section 3.15 * This is followed by a variable length SPI. * Previous next payload: ISAKMP_NEXT_D * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Domain of Interpretation (DOI) ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Protocol-Id ! SPI Size ! # of SPIs ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Security Parameter Index(es) (SPI) ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isad_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 32/BITS_PER_BYTE, "DOI", &doi_names }, { ft_nat, 8/BITS_PER_BYTE, "protocol ID", NULL }, /* ??? really enum: ISAKMP, IPSEC */ { ft_nat, 8/BITS_PER_BYTE, "SPI size", NULL }, { ft_nat, 16/BITS_PER_BYTE, "number of SPIs", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_delete_desc = { "ISAKMP Delete Payload", isad_fields, sizeof(struct isakmp_delete) }; /* ISAKMP Vendor ID Payload * layout from RFC 2408 "ISAKMP" section 3.15 * This is followed by a variable length VID. * Previous next payload: ISAKMP_NEXT_VID * 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ! * ~ Vendor ID (VID) ~ * ! ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct_desc isakmp_vendor_id_desc = { "ISAKMP Vendor ID Payload", isag_fields, sizeof(struct isakmp_generic) }; /* MODECFG */ /* * From draft-dukes-ike-mode-cfg 3.2. Attribute Payload 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Next Payload ! RESERVED ! Payload Length ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Type ! RESERVED ! Identifier ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! ! ~ Attributes ~ ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isaattr_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 8/BITS_PER_BYTE, "Attr Msg Type", &attr_msg_type_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_nat, 16/BITS_PER_BYTE, "Identifier", NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_attr_desc = { "ISAKMP Mode Attribute", isaattr_fields, sizeof(struct isakmp_mode_attr) }; /* ISAKMP NAT-Traversal NAT-D * layout from draft-ietf-ipsec-nat-t-ike-01.txt section 3.2 * * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! HASH of the address and port ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct_desc isakmp_nat_d = { "ISAKMP NAT-D Payload", isag_fields, sizeof(struct isakmp_generic) }; /* ISAKMP NAT-Traversal NAT-OA * layout from draft-ietf-ipsec-nat-t-ike-01.txt section 4.2 * * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! Next Payload ! RESERVED ! Payload Length ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! ID Type ! RESERVED ! RESERVED ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * ! IPv4 (4 octets) or IPv6 address (16 octets) ! * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static field_desc isanat_oa_fields[] = { { ft_enum, 8/BITS_PER_BYTE, "next payload type", &payload_names }, { ft_mbz, 8/BITS_PER_BYTE, NULL, NULL }, { ft_len, 16/BITS_PER_BYTE, "length", NULL }, { ft_enum, 8/BITS_PER_BYTE, "ID type", &ident_names }, { ft_mbz, 24/BITS_PER_BYTE, NULL, NULL }, { ft_end, 0, NULL, NULL } }; struct_desc isakmp_nat_oa = { "ISAKMP NAT-OA Payload", isanat_oa_fields, sizeof(struct isakmp_nat_oa) }; /* descriptor for each payload type * * There is a slight problem in that some payloads differ, depending * on the mode. Since this is table only used for top-level payloads, * Proposal and Transform payloads need not be handled. * That leaves only Identification payloads as a problem. * We make all these entries NULL */ struct_desc *const payload_descs[ISAKMP_NEXT_ROOF] = { NULL, /* 0 ISAKMP_NEXT_NONE (No other payload following) */ &isakmp_sa_desc, /* 1 ISAKMP_NEXT_SA (Security Association) */ NULL, /* 2 ISAKMP_NEXT_P (Proposal) */ NULL, /* 3 ISAKMP_NEXT_T (Transform) */ &isakmp_keyex_desc, /* 4 ISAKMP_NEXT_KE (Key Exchange) */ NULL, /* 5 ISAKMP_NEXT_ID (Identification) */ &isakmp_ipsec_certificate_desc, /* 6 ISAKMP_NEXT_CERT (Certificate) */ &isakmp_ipsec_cert_req_desc, /* 7 ISAKMP_NEXT_CR (Certificate Request) */ &isakmp_hash_desc, /* 8 ISAKMP_NEXT_HASH (Hash) */ &isakmp_signature_desc, /* 9 ISAKMP_NEXT_SIG (Signature) */ &isakmp_nonce_desc, /* 10 ISAKMP_NEXT_NONCE (Nonce) */ &isakmp_notification_desc, /* 11 ISAKMP_NEXT_N (Notification) */ &isakmp_delete_desc, /* 12 ISAKMP_NEXT_D (Delete) */ &isakmp_vendor_id_desc, /* 13 ISAKMP_NEXT_VID (Vendor ID) */ &isakmp_attr_desc, /* 14 ISAKMP_NEXT_ATTR (Mode Config) */ NULL, /* 15 */ NULL, /* 16 */ NULL, /* 17 */ NULL, /* 18 */ NULL, /* 19 */ &isakmp_nat_d, /* 20=130 ISAKMP_NEXT_NATD (NAT-D) */ &isakmp_nat_oa, /* 20=131 ISAKMP_NEXT_NATOA (NAT-OA) */ }; void init_pbs(pb_stream *pbs, u_int8_t *start, size_t len, const char *name) { pbs->container = NULL; pbs->desc = NULL; pbs->name = name; pbs->start = pbs->cur = start; pbs->roof = start + len; pbs->lenfld = NULL; pbs->lenfld_desc = NULL; } #ifdef DEBUG /* print a host struct * * This code assumes that the network and host structure * members have the same alignment and size! This requires * that all padding be explicit. */ void DBG_print_struct(const char *label, const void *struct_ptr , struct_desc *sd, bool len_meaningful) { bool immediate = FALSE; const u_int8_t *inp = struct_ptr; field_desc *fp; DBG_log("%s%s:", label, sd->name); for (fp = sd->fields; fp->field_type != ft_end; fp++) { int i = fp->size; u_int32_t n = 0; switch (fp->field_type) { case ft_mbz: /* must be zero */ inp += i; break; case ft_nat: /* natural number (may be 0) */ case ft_len: /* length of this struct and any following crud */ case ft_lv: /* length/value field of attribute */ case ft_enum: /* value from an enumeration */ case ft_loose_enum: /* value from an enumeration with only some names known */ case ft_af_enum: /* Attribute Format + value from an enumeration */ case ft_af_loose_enum: /* Attribute Format + value from an enumeration */ case ft_set: /* bits representing set */ switch (i) { case 8/BITS_PER_BYTE: n = *(const u_int8_t *)inp; break; case 16/BITS_PER_BYTE: n = *(const u_int16_t *)inp; break; case 32/BITS_PER_BYTE: n = *(const u_int32_t *)inp; break; default: bad_case(i); } switch (fp->field_type) { case ft_len: /* length of this struct and any following crud */ case ft_lv: /* length/value field of attribute */ if (!immediate && !len_meaningful) break; /* FALL THROUGH */ case ft_nat: /* natural number (may be 0) */ DBG_log(" %s: %lu", fp->name, (unsigned long)n); break; case ft_af_enum: /* Attribute Format + value from an enumeration */ case ft_af_loose_enum: /* Attribute Format + value from an enumeration */ if ((n & ISAKMP_ATTR_AF_MASK) == ISAKMP_ATTR_AF_TV) immediate = TRUE; /* FALL THROUGH */ case ft_enum: /* value from an enumeration */ case ft_loose_enum: /* value from an enumeration with only some names known */ DBG_log(" %s: %s", fp->name, enum_show(fp->desc, n)); break; case ft_set: /* bits representing set */ DBG_log(" %s: %s", fp->name, bitnamesof(fp->desc, n)); break; default: bad_case(fp->field_type); } inp += i; break; case ft_raw: /* bytes to be left in network-order */ { char m[50]; /* arbitrary limit on name width in log */ snprintf(m, sizeof(m), " %s:", fp->name); DBG_dump(m, inp, i); inp += i; } break; default: bad_case(fp->field_type); } } } static void DBG_prefix_print_struct(const pb_stream *pbs , const char *label, const void *struct_ptr , struct_desc *sd, bool len_meaningful) { /* print out a title, with a prefix of asterisks to show * the nesting level. */ char space[40]; /* arbitrary limit on label+flock-of-* */ size_t len = strlen(label); if (sizeof(space) <= len) { DBG_print_struct(label, struct_ptr, sd, len_meaningful); } else { const pb_stream *p = pbs; char *pre = &space[sizeof(space) - (len + 1)]; strcpy(pre, label); /* put at least one * out */ for (;;) { if (pre <= space) break; *--pre = '*'; if (p == NULL) break; p = p->container; } DBG_print_struct(pre, struct_ptr, sd, len_meaningful); } } #endif /* "parse" a network struct into a host struct. * * This code assumes that the network and host structure * members have the same alignment and size! This requires * that all padding be explicit. * * If obj_pbs is supplied, a new pb_stream is created for the * variable part of the structure (this depends on their * being one length field in the structure). The cursor of this * new PBS is set to after the parsed part of the struct. * * This routine returns TRUE iff it succeeds. */ bool in_struct(void *struct_ptr, struct_desc *sd , pb_stream *ins, pb_stream *obj_pbs) { err_t ugh = NULL; u_int8_t *cur = ins->cur; if (ins->roof - cur < (ptrdiff_t)sd->size) { ugh = builddiag("not enough room in input packet for %s", sd->name); } else { u_int8_t *roof = cur + sd->size; /* may be changed by a length field */ u_int8_t *outp = struct_ptr; bool immediate = FALSE; field_desc *fp; for (fp = sd->fields; ugh == NULL; fp++) { size_t i = fp->size; passert(ins->roof - cur >= (ptrdiff_t)i); passert(cur - ins->cur <= (ptrdiff_t)(sd->size - i)); passert(outp - (cur - ins->cur) == struct_ptr); #if 0 DBG(DBG_PARSING, DBG_log("%d %s" , (int) (cur - ins->cur), fp->name == NULL? "" : fp->name)); #endif switch (fp->field_type) { case ft_mbz: /* must be zero */ for (; i != 0; i--) { if (*cur++ != 0) { ugh = builddiag("byte %d of %s must be zero, but is not" , (int) (cur - ins->cur), sd->name); break; } *outp++ = '\0'; /* probably redundant */ } break; case ft_nat: /* natural number (may be 0) */ case ft_len: /* length of this struct and any following crud */ case ft_lv: /* length/value field of attribute */ case ft_enum: /* value from an enumeration */ case ft_loose_enum: /* value from an enumeration with only some names known */ case ft_af_enum: /* Attribute Format + value from an enumeration */ case ft_af_loose_enum: /* Attribute Format + value from an enumeration */ case ft_set: /* bits representing set */ { u_int32_t n = 0; for (; i != 0; i--) n = (n << BITS_PER_BYTE) | *cur++; switch (fp->field_type) { case ft_len: /* length of this struct and any following crud */ case ft_lv: /* length/value field of attribute */ { u_int32_t len = fp->field_type == ft_len? n : immediate? sd->size : n + sd->size; if (len < sd->size) { ugh = builddiag("%s of %s is smaller than minimum" , fp->name, sd->name); } else if (pbs_left(ins) < len) { ugh = builddiag("%s of %s is larger than can fit" , fp->name, sd->name); } else { roof = ins->cur + len; } break; } case ft_af_loose_enum: /* Attribute Format + value from an enumeration */ if ((n & ISAKMP_ATTR_AF_MASK) == ISAKMP_ATTR_AF_TV) immediate = TRUE; break; case ft_af_enum: /* Attribute Format + value from an enumeration */ if ((n & ISAKMP_ATTR_AF_MASK) == ISAKMP_ATTR_AF_TV) immediate = TRUE; /* FALL THROUGH */ case ft_enum: /* value from an enumeration */ if (enum_name(fp->desc, n) == NULL) { ugh = builddiag("%s of %s has an unknown value: %lu" , fp->name, sd->name, (unsigned long)n); } /* FALL THROUGH */ case ft_loose_enum: /* value from an enumeration with only some names known */ break; case ft_set: /* bits representing set */ if (!testset(fp->desc, n)) { ugh = builddiag("bitset %s of %s has unknown member(s): %s" , fp->name, sd->name, bitnamesof(fp->desc, n)); } break; default: break; } i = fp->size; switch (i) { case 8/BITS_PER_BYTE: *(u_int8_t *)outp = n; break; case 16/BITS_PER_BYTE: *(u_int16_t *)outp = n; break; case 32/BITS_PER_BYTE: *(u_int32_t *)outp = n; break; default: bad_case(i); } outp += i; break; } case ft_raw: /* bytes to be left in network-order */ for (; i != 0; i--) { *outp++ = *cur++; } break; case ft_end: /* end of field list */ passert(cur == ins->cur + sd->size); if (obj_pbs != NULL) { init_pbs(obj_pbs, ins->cur, roof - ins->cur, sd->name); obj_pbs->container = ins; obj_pbs->desc = sd; obj_pbs->cur = cur; } ins->cur = roof; DBG(DBG_PARSING , DBG_prefix_print_struct(ins, "parse ", struct_ptr, sd, TRUE)); return TRUE; default: bad_case(fp->field_type); } } } /* some failure got us here: report it */ loglog(RC_LOG_SERIOUS, ugh); return FALSE; } bool in_raw(void *bytes, size_t len, pb_stream *ins, const char *name) { if (pbs_left(ins) < len) { loglog(RC_LOG_SERIOUS, "not enough bytes left to get %s from %s", name, ins->name); return FALSE; } else { if (bytes == NULL) { DBG(DBG_PARSING , DBG_log("skipping %u raw bytes of %s (%s)" , (unsigned) len, ins->name, name); DBG_dump(name, ins->cur, len)); } else { memcpy(bytes, ins->cur, len); DBG(DBG_PARSING , DBG_log("parsing %u raw bytes of %s into %s" , (unsigned) len, ins->name, name); DBG_dump(name, bytes, len)); } ins->cur += len; return TRUE; } } /* "emit" a host struct into a network packet. * * This code assumes that the network and host structure * members have the same alignment and size! This requires * that all padding be explicit. * * If obj_pbs is non-NULL, its pbs describes a new output stream set up * to contain the object. The cursor will be left at the variable part. * This new stream must subsequently be finalized by close_output_pbs(). * * The value of any field of type ft_len is computed, not taken * from the input struct. The length is actually filled in when * the object's output stream is finalized. If obj_pbs is NULL, * finalization is done by out_struct before it returns. * * This routine returns TRUE iff it succeeds. */ bool out_struct(const void *struct_ptr, struct_desc *sd , pb_stream *outs, pb_stream *obj_pbs) { err_t ugh = NULL; const u_int8_t *inp = struct_ptr; u_int8_t *cur = outs->cur; DBG(DBG_EMITTING , DBG_prefix_print_struct(outs, "emit ", struct_ptr, sd, obj_pbs==NULL)); if (outs->roof - cur < (ptrdiff_t)sd->size) { ugh = builddiag("not enough room left in output packet to place %s" , sd->name); } else { bool immediate = FALSE; pb_stream obj; field_desc *fp; obj.lenfld = NULL; /* until a length field is discovered */ obj.lenfld_desc = NULL; for (fp = sd->fields; ugh == NULL; fp++) { size_t i = fp->size; passert(outs->roof - cur >= (ptrdiff_t)i); passert(cur - outs->cur <= (ptrdiff_t)(sd->size - i)); passert(inp - (cur - outs->cur) == struct_ptr); #if 0 DBG(DBG_EMITTING, DBG_log("%d %s" , (int) (cur - outs->cur), fp->name == NULL? "" : fp->name); #endif switch (fp->field_type) { case ft_mbz: /* must be zero */ inp += i; for (; i != 0; i--) *cur++ = '\0'; break; case ft_nat: /* natural number (may be 0) */ case ft_len: /* length of this struct and any following crud */ case ft_lv: /* length/value field of attribute */ case ft_enum: /* value from an enumeration */ case ft_loose_enum: /* value from an enumeration with only some names known */ case ft_af_enum: /* Attribute Format + value from an enumeration */ case ft_af_loose_enum: /* Attribute Format + value from an enumeration */ case ft_set: /* bits representing set */ { u_int32_t n = 0; switch (i) { case 8/BITS_PER_BYTE: n = *(const u_int8_t *)inp; break; case 16/BITS_PER_BYTE: n = *(const u_int16_t *)inp; break; case 32/BITS_PER_BYTE: n = *(const u_int32_t *)inp; break; default: bad_case(i); } switch (fp->field_type) { case ft_len: /* length of this struct and any following crud */ case ft_lv: /* length/value field of attribute */ if (immediate) break; /* not a length */ /* We can't check the length because it will likely * be filled in after variable part is supplied. * We do record where this is so that it can be * filled in by a subsequent close_output_pbs(). */ passert(obj.lenfld == NULL); /* only one ft_len allowed */ obj.lenfld = cur; obj.lenfld_desc = fp; break; case ft_af_loose_enum: /* Attribute Format + value from an enumeration */ if ((n & ISAKMP_ATTR_AF_MASK) == ISAKMP_ATTR_AF_TV) immediate = TRUE; break; case ft_af_enum: /* Attribute Format + value from an enumeration */ if ((n & ISAKMP_ATTR_AF_MASK) == ISAKMP_ATTR_AF_TV) immediate = TRUE; /* FALL THROUGH */ case ft_enum: /* value from an enumeration */ if (enum_name(fp->desc, n) == NULL) { ugh = builddiag("%s of %s has an unknown value: %lu" , fp->name, sd->name, (unsigned long)n); } /* FALL THROUGH */ case ft_loose_enum: /* value from an enumeration with only some names known */ break; case ft_set: /* bits representing set */ if (!testset(fp->desc, n)) { ugh = builddiag("bitset %s of %s has unknown member(s): %s" , fp->name, sd->name, bitnamesof(fp->desc, n)); } break; default: break; } while (i-- != 0) { cur[i] = (u_int8_t)n; n >>= BITS_PER_BYTE; } inp += fp->size; cur += fp->size; break; } case ft_raw: /* bytes to be left in network-order */ for (; i != 0; i--) *cur++ = *inp++; break; case ft_end: /* end of field list */ passert(cur == outs->cur + sd->size); obj.container = outs; obj.desc = sd; obj.name = sd->name; obj.start = outs->cur; obj.cur = cur; obj.roof = outs->roof; /* limit of possible */ /* obj.lenfld and obj.lenfld_desc already set */ if (obj_pbs == NULL) { close_output_pbs(&obj); /* fill in length field, if any */ } else { /* We set outs->cur to outs->roof so that * any attempt to output something into outs * before obj is closed will trigger an error. */ outs->cur = outs->roof; *obj_pbs = obj; } return TRUE; default: bad_case(fp->field_type); } } } /* some failure got us here: report it */ loglog(RC_LOG_SERIOUS, ugh); /* ??? serious, but errno not relevant */ return FALSE; } bool out_generic(u_int8_t np, struct_desc *sd , pb_stream *outs, pb_stream *obj_pbs) { struct isakmp_generic gen; passert(sd->fields == isakmp_generic_desc.fields); gen.isag_np = np; return out_struct(&gen, sd, outs, obj_pbs); } bool out_generic_raw(u_int8_t np, struct_desc *sd , pb_stream *outs, const void *bytes, size_t len, const char *name) { pb_stream pbs; if (!out_generic(np, sd, outs, &pbs) || !out_raw(bytes, len, &pbs, name)) return FALSE; close_output_pbs(&pbs); return TRUE; } bool out_raw(const void *bytes, size_t len, pb_stream *outs, const char *name) { if (pbs_left(outs) < len) { loglog(RC_LOG_SERIOUS, "not enough room left to place %lu bytes of %s in %s" , (unsigned long) len, name, outs->name); return FALSE; } else { DBG(DBG_EMITTING , DBG_log("emitting %u raw bytes of %s into %s" , (unsigned) len, name, outs->name); DBG_dump(name, bytes, len)); memcpy(outs->cur, bytes, len); outs->cur += len; return TRUE; } } bool out_zero(size_t len, pb_stream *outs, const char *name) { if (pbs_left(outs) < len) { loglog(RC_LOG_SERIOUS, "not enough room left to place %s in %s", name, outs->name); return FALSE; } else { DBG(DBG_EMITTING, DBG_log("emitting %u zero bytes of %s into %s" , (unsigned) len, name, outs->name)); memset(outs->cur, 0x00, len); outs->cur += len; return TRUE; } } /* Record current length. * Note: currently, this may be repeated any number of times; * the last one wins. */ void close_output_pbs(pb_stream *pbs) { if (pbs->lenfld != NULL) { u_int32_t len = pbs_offset(pbs); int i = pbs->lenfld_desc->size; if (pbs->lenfld_desc->field_type == ft_lv) len -= sizeof(struct isakmp_attribute); DBG(DBG_EMITTING, DBG_log("emitting length of %s: %lu" , pbs->name, (unsigned long) len)); while (i-- != 0) { pbs->lenfld[i] = (u_int8_t)len; len >>= BITS_PER_BYTE; } } if (pbs->container != NULL) pbs->container->cur = pbs->cur; /* pass space utilization up */ }