decode.c File Reference

Code common to EAP-SIM/AKA/AKA' clients and servers. More...

#include <freeradius-devel/io/test_point.h>
#include <freeradius-devel/server/module.h>
#include <freeradius-devel/tls/strerror.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/sha1.h>
#include <freeradius-devel/util/decode.h>
#include <freeradius-devel/eap/types.h>
#include "attrs.h"
#include "base.h"
#include "crypto_priv.h"

Include dependency graph for decode.c:

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Functions
static int	_test_ctx_free (UNUSED fr_aka_sim_ctx_t *ctx)
static int	decode_test_ctx_aka (void **out, TALLOC_CTX *ctx)
static int	decode_test_ctx_sim (void **out, TALLOC_CTX *ctx)
static int	decode_test_ctx_sim_rfc4186 (void **out, TALLOC_CTX *ctx)
int	fr_aka_sim_decode (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_t const *dict, uint8_t const *data, size_t data_len, fr_aka_sim_ctx_t *decode_ctx)
	Decode SIM/AKA/AKA' specific packet data. More...
ssize_t	fr_aka_sim_decode_pair (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *parent, uint8_t const *data, size_t data_len, void *decode_ctx)
	Decode SIM/AKA/AKA' attributes. More...
static int	sim_array_members (size_t *out, size_t len, fr_dict_attr_t const *da)
	Returns the number of array members for arrays with fixed element sizes. More...
static ssize_t	sim_decode_array (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *parent, uint8_t const *data, size_t const attr_len, UNUSED size_t data_len, void *decode_ctx)
static ssize_t	sim_decode_pair_internal (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *parent, uint8_t const *data, size_t data_len, void *decode_ctx)
	Decode SIM/AKA/AKA' attributes. More...
static ssize_t	sim_decode_pair_value (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *parent, uint8_t const *data, size_t const attr_len, size_t const data_len, void *decode_ctx)
	Create any kind of VP from the attribute contents. More...
static ssize_t	sim_decode_tlv (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *parent, uint8_t const *data, size_t const attr_len, size_t data_len, void *decode_ctx)
	Break apart a TLV attribute into individual attributes. More...
static int	sim_iv_extract (uint8_t out[AKA_SIM_IV_SIZE], uint8_t const *in, size_t in_len)
	Extract the IV value from an AT_IV attribute. More...
static ssize_t	sim_value_decrypt (TALLOC_CTX *ctx, uint8_t **out, uint8_t const *data, size_t const attr_len, size_t const data_len, void *decode_ctx)
	Decrypt an AES-128-CBC encrypted attribute. More...
static fr_aka_sim_ctx_t *	test_ctx_init (TALLOC_CTX *ctx, uint8_t const *k_encr, size_t k_encr_len)

Variables
fr_test_point_pair_decode_t	aka_tp_decode
fr_test_point_pair_decode_t	sim_tp_decode
fr_test_point_pair_decode_t	sim_tp_decode_rfc4186

Detailed Description

Code common to EAP-SIM/AKA/AKA' clients and servers.

The development of the EAP-SIM support was funded by Internet Foundation Austria (http://www.nic.at/ipa).

Copyright

2003 Michael Richardson (mcr@s.nosp@m.ande.nosp@m.lman..nosp@m.otta.nosp@m.wa.on.nosp@m..ca)

2003-2016 The FreeRADIUS server project

Definition in file decode.c.

Function Documentation

_test_ctx_free()

static int _test_ctx_free ( UNUSED fr_aka_sim_ctx_t *  ctx )

static

Definition at line 1004 of file decode.c.

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decode_test_ctx_aka()

static int decode_test_ctx_aka ( void **  out, TALLOC_CTX *  ctx  )

static

Definition at line 1043 of file decode.c.

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decode_test_ctx_sim()

static int decode_test_ctx_sim ( void **  out, TALLOC_CTX *  ctx  )

static

Definition at line 1026 of file decode.c.

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decode_test_ctx_sim_rfc4186()

static int decode_test_ctx_sim_rfc4186 ( void **  out, TALLOC_CTX *  ctx  )

static

Definition at line 1059 of file decode.c.

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fr_aka_sim_decode()

int fr_aka_sim_decode	(	TALLOC_CTX *	ctx,
		fr_pair_list_t *	out,
		fr_dict_t const *	dict,
		uint8_t const *	data,
		size_t	data_len,
		fr_aka_sim_ctx_t *	decode_ctx
	)

Decode SIM/AKA/AKA' specific packet data.

Note

data should point to the subtype field in the EAP packet.

Extracts the SUBTYPE and adds it an attribute, then decodes any TLVs in the SIM/AKA/AKA' packet.

0 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Code | Identifier | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Subtype | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

The first byte of the data pointer should be the subtype.

Parameters

[in]	ctx	where to allocate the pairs.
[in]	out	where to write out attributes.
[in]	dict	for looking up attributes.
[in]	data	to convert to pairs.
[in]	data_len	length of data to convert.
[in]	decode_ctx	holds the state of the decoder.

Returns

• 0 on success.
• -1 on failure.

Definition at line 942 of file decode.c.

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fr_aka_sim_decode_pair()

ssize_t fr_aka_sim_decode_pair	(	TALLOC_CTX *	ctx,
		fr_pair_list_t *	out,
		fr_dict_attr_t const *	parent,
		uint8_t const *	data,
		size_t	data_len,
		void *	decode_ctx
	)

Decode SIM/AKA/AKA' attributes.

Parameters

[in]	ctx	to allocate attributes in.
[in]	out	where to insert the attributes.
[in]	parent	for looking up attributes.
[in]	data	data to parse.
[in]	data_len	length of data. For top level attributes packet_ctx must be the length of the packet (so we can hunt for AT_IV), for Sub-TLVs it should be the length of the container value.
[in]	decode_ctx	extra context to pass to the decoder.

Returns

• The number of bytes parsed.
• -1 on error.

Definition at line 909 of file decode.c.

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sim_array_members()

static int sim_array_members ( size_t *  out, size_t  len, fr_dict_attr_t const *  da  )

static

Returns the number of array members for arrays with fixed element sizes.

Parameters

[out]	out	The element length.
[in]	len	the total length of the array.
[in]	da	the specifying the array type.

Returns

• The number of elements in the array on success.
• < 0 on error (array length not a multiple of element size).

Definition at line 250 of file decode.c.

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sim_decode_array()

static ssize_t sim_decode_array ( TALLOC_CTX *  ctx, fr_pair_list_t *  out, fr_dict_attr_t const *  parent, uint8_t const *  data, size_t const  attr_len, UNUSED size_t  data_len, void *  decode_ctx  )

static

Definition at line 297 of file decode.c.

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sim_decode_pair_internal()

static ssize_t sim_decode_pair_internal ( TALLOC_CTX *  ctx, fr_pair_list_t *  out, fr_dict_attr_t const *  parent, uint8_t const *  data, size_t  data_len, void *  decode_ctx  )

static

Decode SIM/AKA/AKA' attributes.

Parameters

[in]	ctx	to allocate attributes in.
[in]	out	where to insert the attributes.
[in]	parent	of current attribute being decoded.
[in]	data	data to parse.
[in]	data_len	length of data. For top level attributes packet_ctx must be the length of the packet (so we can hunt for AT_IV), for Sub-TLVs it should be the length of the container value.
[in]	decode_ctx	extra context to pass to the decoder.

Returns

• The number of bytes parsed.
• -1 on error.

Definition at line 831 of file decode.c.

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sim_decode_pair_value()

static ssize_t sim_decode_pair_value ( TALLOC_CTX *  ctx, fr_pair_list_t *  out, fr_dict_attr_t const *  parent, uint8_t const *  data, size_t const  attr_len, size_t const  data_len, void *  decode_ctx  )

static

Create any kind of VP from the attribute contents.

Parameters

[in]	ctx	to allocate new attributes in.
[in]	out	to add new attributes to.
[in]	parent	the current attribute we're processing.
[in]	data	to parse. Points to the data field of the attribute.
[in]	attr_len	length of the attribute being parsed.
[in]	data_len	length of the remaining data in the packet.
[in]	decode_ctx	IVs, keys etc...

Returns

• Length on success.
• -1 on failure.

Definition at line 525 of file decode.c.

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sim_decode_tlv()

static ssize_t sim_decode_tlv ( TALLOC_CTX *  ctx, fr_pair_list_t *  out, fr_dict_attr_t const *  parent, uint8_t const *  data, size_t const  attr_len, size_t  data_len, void *  decode_ctx  )

static

Break apart a TLV attribute into individual attributes.

Parameters

[in]	ctx	to allocate new attributes in.
[in]	out	to add new attributes to.
[in]	parent	the current attribute TLV attribute we're processing.
[in]	data	to parse. Points to the data field of the attribute.
[in]	attr_len	length of the TLV attribute.
[in]	data_len	remaining data in the packet.
[in]	decode_ctx	IVs, keys etc...

Returns

• Length on success.
• < 0 on malformed attribute.

Definition at line 368 of file decode.c.

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sim_iv_extract()

static int sim_iv_extract ( uint8_t  out[AKA_SIM_IV_SIZE], uint8_t const *  in, size_t  in_len  )

inlinestatic

Extract the IV value from an AT_IV attribute.

SIM uses padding at the start of the attribute to make it a multiple of 4. We need to strip packet_ctx and check that it was set to zero.

Parameters

[out]	out	Where to write IV.
[in]	in	value of AT_IV attribute.
[in]	in_len	the length of the AT_IV attribute (should be 18).

Returns

• 0 on success.
• < 0 on failure (bad IV).

Definition at line 79 of file decode.c.

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sim_value_decrypt()

static ssize_t sim_value_decrypt ( TALLOC_CTX *  ctx, uint8_t **  out, uint8_t const *  data, size_t const  attr_len, size_t const  data_len, void *  decode_ctx  )

static

Decrypt an AES-128-CBC encrypted attribute.

Parameters

[in]	ctx	to allocate decr buffer in.
[out]	out	where to write pointer to decr buffer.
[in]	data	to decrypt.
[in]	attr_len	length of encrypted data.
[in]	data_len	length of data remaining in the packet.
[in]	decode_ctx	containing keys, and the IV (if we already found it).

Returns

• Number of decr bytes decrypted on success.
• < 0 on failure.

Definition at line 115 of file decode.c.

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test_ctx_init()

static fr_aka_sim_ctx_t* test_ctx_init ( TALLOC_CTX *  ctx, uint8_t const *  k_encr, size_t  k_encr_len  )

static

Definition at line 1011 of file decode.c.

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Variable Documentation

aka_tp_decode

fr_test_point_pair_decode_t aka_tp_decode

Initial value:

= {
        .test_ctx       = decode_test_ctx_aka,
        .func           = fr_aka_sim_decode_pair
}

Definition at line 1089 of file decode.c.

sim_tp_decode

fr_test_point_pair_decode_t sim_tp_decode

Initial value:

= {
        .test_ctx       = decode_test_ctx_sim,
        .func           = fr_aka_sim_decode_pair
}

Definition at line 1077 of file decode.c.

sim_tp_decode_rfc4186

fr_test_point_pair_decode_t sim_tp_decode_rfc4186

Initial value:

= {
        .test_ctx       = decode_test_ctx_sim_rfc4186,
        .func           = fr_aka_sim_decode_pair
}

Definition at line 1083 of file decode.c.