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Extended IKE header for IKEv1 support

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This commit is contained in:
Martin Willi
2012-03-20 17:30:39 +01:00
parent ccdd3a4cee
commit 526b5afb45
4 changed files with 238 additions and 60 deletions
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src/libcharon/encoding/payloads/ike_header.c
+136 -37
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@@ -81,12 +81,27 @@ struct private_ike_header_t {
* TRUE, if this is a response, FALSE if its a Request.
*/
bool response;
/**
* TRUE, if the packet is encrypted (IKEv1).
*/
bool encryption;
/**
* TRUE, if the commit flag is set (IKEv1).
*/
bool commit;
/**
* TRUE, if the auth only flag is set (IKEv1).
*/
bool authonly;
} flags;
/**
* Reserved bits of IKE header
*/
bool reserved[5];
bool reserved[2];
/**
* Associated Message-ID.
@@ -99,9 +114,14 @@ struct private_ike_header_t {
u_int32_t length;
};
ENUM_BEGIN(exchange_type_names, EXCHANGE_TYPE_UNDEFINED, EXCHANGE_TYPE_UNDEFINED,
"EXCHANGE_TYPE_UNDEFINED");
ENUM_NEXT(exchange_type_names, IKE_SA_INIT, IKE_SESSION_RESUME, EXCHANGE_TYPE_UNDEFINED,
ENUM_BEGIN(exchange_type_names, ID_PROT, INFORMATIONAL_V1,
"ID_PROT",
"AUTH_ONLY",
"AGGRESSIVE",
"INFORMATIONAL_V1");
ENUM_NEXT(exchange_type_names, QUICK_MODE, IKE_SESSION_RESUME, INFORMATIONAL_V1,
"QUICK_MODE",
"NEW_GROUP_MODE",
"IKE_SA_INIT",
"IKE_AUTH",
"CREATE_CHILD_SA",
@@ -110,13 +130,18 @@ ENUM_NEXT(exchange_type_names, IKE_SA_INIT, IKE_SESSION_RESUME, EXCHANGE_TYPE_UN
#ifdef ME
ENUM_NEXT(exchange_type_names, ME_CONNECT, ME_CONNECT, IKE_SESSION_RESUME,
"ME_CONNECT");
ENUM_END(exchange_type_names, ME_CONNECT);
ENUM_NEXT(exchange_type_names, EXCHANGE_TYPE_UNDEFINED,
EXCHANGE_TYPE_UNDEFINED, ME_CONNECT,
"EXCHANGE_TYPE_UNDEFINED");
#else
ENUM_END(exchange_type_names, IKE_SESSION_RESUME);
ENUM_NEXT(exchange_type_names, EXCHANGE_TYPE_UNDEFINED,
EXCHANGE_TYPE_UNDEFINED, IKE_SESSION_RESUME,
"EXCHANGE_TYPE_UNDEFINED");
#endif /* ME */
ENUM_END(exchange_type_names, EXCHANGE_TYPE_UNDEFINED);
/**
* Encoding rules to parse or generate a IKEv2-Header.
* Encoding rules to parse or generate a IKE-Header.
*
* The defined offsets are the positions in a object of type
* ike_header_t.
@@ -137,21 +162,19 @@ encoding_rule_t ike_header_encodings[] = {
/* 2 Bit reserved bits */
{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[0]) },
{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[1]) },
/* 3 Bit flags, stored in the fields response, version and initiator */
/* 6 flags */
{ FLAG, offsetof(private_ike_header_t, flags.response) },
{ FLAG, offsetof(private_ike_header_t, flags.version) },
{ FLAG, offsetof(private_ike_header_t, flags.initiator) },
/* 3 Bit reserved bits */
{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[2]) },
{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[3]) },
{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[4]) },
{ FLAG, offsetof(private_ike_header_t, flags.authonly) },
{ FLAG, offsetof(private_ike_header_t, flags.commit) },
{ FLAG, offsetof(private_ike_header_t, flags.encryption)},
/* 4 Byte message id, stored in the field message_id */
{ U_INT_32, offsetof(private_ike_header_t, message_id) },
/* 4 Byte length fied, stored in the field length */
{ HEADER_LENGTH,offsetof(private_ike_header_t, length) },
};
/* 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -172,26 +195,51 @@ encoding_rule_t ike_header_encodings[] = {
METHOD(payload_t, verify, status_t,
private_ike_header_t *this)
{
if ((this->exchange_type < IKE_SA_INIT) ||
((this->exchange_type > INFORMATIONAL)
#ifdef ME
&& (this->exchange_type != ME_CONNECT)
#endif /* ME */
))
switch (this->exchange_type)
{
/* unsupported exchange type */
return FAILED;
case ID_PROT:
case AGGRESSIVE:
if (this->message_id != 0)
{
return FAILED;
}
/* fall */
case AUTH_ONLY:
case INFORMATIONAL_V1:
case QUICK_MODE:
case NEW_GROUP_MODE:
if (this->maj_version != IKEV1_MAJOR_VERSION)
{
return FAILED;
}
break;
case IKE_SA_INIT:
case IKE_AUTH:
case CREATE_CHILD_SA:
case INFORMATIONAL:
case IKE_SESSION_RESUME:
#ifdef ME
case ME_CONNECT:
#endif /* ME */
if (this->maj_version != IKEV2_MAJOR_VERSION)
{
return FAILED;
}
break;
default:
/* unsupported exchange type */
return FAILED;
}
if (this->initiator_spi == 0
#ifdef ME
/* we allow zero spi for INFORMATIONAL exchanges,
* to allow connectivity checks */
&& this->exchange_type != INFORMATIONAL
#endif /* ME */
)
if (this->initiator_spi == 0)
{
/* initiator spi not set */
return FAILED;
#ifdef ME
if (this->exchange_type != INFORMATIONAL)
/* we allow zero spi for INFORMATIONAL exchanges,
* to allow connectivity checks */
#endif /* ME */
{
return FAILED;
}
}
return SUCCESS;
}
@@ -311,6 +359,43 @@ METHOD(ike_header_t, set_initiator_flag, void,
this->flags.initiator = initiator;
}
METHOD(ike_header_t, get_encryption_flag, bool,
private_ike_header_t *this)
{
return this->flags.encryption;
}
METHOD(ike_header_t, set_encryption_flag, void,
private_ike_header_t *this, bool encryption)
{
this->flags.encryption = encryption;
}
METHOD(ike_header_t, get_commit_flag, bool,
private_ike_header_t *this)
{
return this->flags.commit;
}
METHOD(ike_header_t, set_commit_flag, void,
private_ike_header_t *this, bool commit)
{
this->flags.commit = commit;
}
METHOD(ike_header_t, get_authonly_flag, bool,
private_ike_header_t *this)
{
return this->flags.authonly;
}
METHOD(ike_header_t, set_authonly_flag, void,
private_ike_header_t *this, bool authonly)
{
this->flags.authonly = authonly;
}
METHOD(ike_header_t, get_exchange_type, u_int8_t,
private_ike_header_t *this)
{
@@ -373,21 +458,35 @@ ike_header_t *ike_header_create()
.set_version_flag = _set_version_flag,
.get_initiator_flag = _get_initiator_flag,
.set_initiator_flag = _set_initiator_flag,
.get_encryption_flag = _get_encryption_flag,
.set_encryption_flag = _set_encryption_flag,
.get_commit_flag = _get_commit_flag,
.set_commit_flag = _set_commit_flag,
.get_authonly_flag = _get_authonly_flag,
.set_authonly_flag = _set_authonly_flag,
.get_exchange_type = _get_exchange_type,
.set_exchange_type = _set_exchange_type,
.get_message_id = _get_message_id,
.set_message_id = _set_message_id,
.destroy = _destroy,
},
.maj_version = IKE_MAJOR_VERSION,
.min_version = IKE_MINOR_VERSION,
.exchange_type = EXCHANGE_TYPE_UNDEFINED,
.flags = {
.initiator = TRUE,
.version = HIGHER_VERSION_SUPPORTED_FLAG,
},
.length = IKE_HEADER_LENGTH,
.exchange_type = EXCHANGE_TYPE_UNDEFINED,
);
return &this->public;
}
/*
* Described in header.
*/
ike_header_t *ike_header_create_version(int major, int minor)
{
ike_header_t *this = ike_header_create();
this->set_maj_version(this, major);
this->set_min_version(this, minor);
this->set_initiator_flag(this, TRUE);
return this;
}