decode.c File Reference

Low-Level TACACS+ decoding functions. More...

#include <freeradius-devel/io/test_point.h>
#include <freeradius-devel/protocol/tacacs/tacacs.h>
#include <freeradius-devel/util/debug.h>
#include <freeradius-devel/util/net.h>
#include <freeradius-devel/util/struct.h>
#include "tacacs.h"
#include "attrs.h"

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Macros
#define	ARG_COUNT_CHECK(_msg, _hdr)
#define	BODY(_x)   (((uint8_t const *) pkt) + sizeof(pkt->hdr) + sizeof(pkt->_x))
#define	DECODE_FIELD_STRING16(_da, _field)
#define	DECODE_FIELD_STRING8(_da, _field)
#define	DECODE_FIELD_UINT8(_da, _field)
#define	PACKET_HEADER_CHECK(_msg, _hdr)

Functions
static int	_encode_test_ctx (fr_tacacs_ctx_t *proto_ctx)
static int	decode_test_ctx (void **out, TALLOC_CTX *ctx)
ssize_t	fr_tacacs_decode (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *vendor, uint8_t const *buffer, size_t buffer_len, const uint8_t *original, char const *const secret, size_t secret_len, int *code)
	Decode a TACACS+ packet. More...
static ssize_t	fr_tacacs_decode_proto (TALLOC_CTX *ctx, fr_pair_list_t *out, uint8_t const *data, size_t data_len, void *proto_ctx)
int	fr_tacacs_packet_to_code (fr_tacacs_packet_t const *pkt)
static int	tacacs_decode_args (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *parent, uint8_t arg_cnt, uint8_t const *argv, uint8_t const *attrs, NDEBUG_UNUSED uint8_t const *end)
	Decode a TACACS+ 'arg_N' fields. More...
static int	tacacs_decode_field (TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *da, uint8_t const **field_data, uint16_t field_len, uint8_t const *end)
	Decode a TACACS+ field. More...

Variables
fr_test_point_proto_decode_t	tacacs_tp_decode_proto

Detailed Description

Low-Level TACACS+ decoding functions.

Id

ded0a02c987dc9deebaf8daed7ea73f8ae4245fc

Copyright

2017 The FreeRADIUS server project

2017 Network RADIUS SAS (legal.nosp@m.@net.nosp@m.workr.nosp@m.adiu.nosp@m.s.com)

Definition in file decode.c.

Macro Definition Documentation

ARG_COUNT_CHECK

#define ARG_COUNT_CHECK	(		_msg,
			_hdr
	)

Value:

        do { \
        fr_assert(p == (uint8_t const *) &(_hdr)); \
        if (data_len > (size_t) (end - p)) { \
                fr_strerror_printf("Argument count %u overflows the remaining data (%zu) in the %s packet", _hdr.arg_cnt, end - p, _msg); \
                goto fail; \
        } \
        argv = body; \
        attrs = buffer + FR_HEADER_LENGTH + data_len; \
        body += _hdr.arg_cnt; \
        p = attrs; \
        for (int i = 0; i < _hdr.arg_cnt; i++) { \
                if (_hdr.arg_len[i] > (size_t) (end - p)) { \
                        fr_strerror_printf("Argument %u length %u overflows packet", i, _hdr.arg_len[i]); \
                        goto fail; \
                } \
                p += _hdr.arg_len[i]; \
        } \
} while (0)

Definition at line 140 of file decode.c.

BODY

#define BODY

(

_x

)

(((uint8_t const *) pkt) + sizeof(pkt->hdr) + sizeof(pkt->_x))

Definition at line 176 of file decode.c.

DECODE_FIELD_STRING16

#define DECODE_FIELD_STRING16	(		_da,
			_field
	)

Value:

        do { \
        if (tacacs_decode_field(ctx, out, _da, &p, \
            ntohs(_field), end) < 0) goto fail; \
} while (0)

Definition at line 171 of file decode.c.

DECODE_FIELD_STRING8

#define DECODE_FIELD_STRING8	(		_da,
			_field
	)

Value:

        do { \
        if (tacacs_decode_field(ctx, out, _da, &p, \
            _field, end) < 0) goto fail; \
} while (0)

Definition at line 166 of file decode.c.

DECODE_FIELD_UINT8

#define DECODE_FIELD_UINT8	(		_da,
			_field
	)

Value:

        do { \
        vp = fr_pair_afrom_da(ctx, _da); \
        if (!vp) goto fail; \
        vp->vp_uint8 = _field; \
        fr_pair_append(out, vp); \
} while (0)

Definition at line 159 of file decode.c.

PACKET_HEADER_CHECK

#define PACKET_HEADER_CHECK	(		_msg,
			_hdr
	)

Value:

        do { \
        p = buffer + FR_HEADER_LENGTH; \
        if (sizeof(_hdr) > (size_t) (end - p)) { \
                fr_strerror_printf("Header for %s is too small (%zu < %zu)", _msg, end - (uint8_t const *) pkt, p - (uint8_t const *) pkt); \
                goto fail; \
        } \
        body = p + sizeof(_hdr); \
        data_len = sizeof(_hdr); \
} while (0)

Definition at line 127 of file decode.c.

Function Documentation

_encode_test_ctx()

static int _encode_test_ctx ( fr_tacacs_ctx_t *  proto_ctx )

static

Definition at line 1081 of file decode.c.

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decode_test_ctx()

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

static

Definition at line 1090 of file decode.c.

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fr_tacacs_decode()

ssize_t fr_tacacs_decode	(	TALLOC_CTX *	ctx,
		fr_pair_list_t *	out,
		fr_dict_attr_t const *	vendor,
		uint8_t const *	buffer,
		size_t	buffer_len,
		const uint8_t *	original,
		char const *const	secret,
		size_t	secret_len,
		int *	code
	)

Decode a TACACS+ packet.

4.1. The Authentication START Packet Body

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 +-------------—+-------------—+-------------—+-------------—+ | action | priv_lvl | authen_type | authen_service | +-------------—+-------------—+-------------—+-------------—+ | user_len | port_len | rem_addr_len | data_len | +-------------—+-------------—+-------------—+-------------—+ | user ... +-------------—+-------------—+-------------—+-------------—+ | port ... +-------------—+-------------—+-------------—+-------------—+ | rem_addr ... +-------------—+-------------—+-------------—+-------------—+ | data... +-------------—+-------------—+-------------—+-------------—+

6.1. The Account REQUEST Packet Body

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 +-------------—+-------------—+-------------—+-------------—+ | flags | authen_method | priv_lvl | authen_type | +-------------—+-------------—+-------------—+-------------—+ | authen_service | user_len | port_len | rem_addr_len | +-------------—+-------------—+-------------—+-------------—+ | arg_cnt | arg_1_len | arg_2_len | ... | +-------------—+-------------—+-------------—+-------------—+ | arg_N_len | user ... +-------------—+-------------—+-------------—+-------------—+ | port ... +-------------—+-------------—+-------------—+-------------—+ | rem_addr ... +-------------—+-------------—+-------------—+-------------—+ | arg_1 ... +-------------—+-------------—+-------------—+-------------—+ | arg_2 ... +-------------—+-------------—+-------------—+-------------—+ | ... +-------------—+-------------—+-------------—+-------------—+ | arg_N ... +-------------—+-------------—+-------------—+-------------—+

6.2. The Accounting REPLY Packet Body

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 +-------------—+-------------—+-------------—+-------------—+ | server_msg len | data_len | +-------------—+-------------—+-------------—+-------------—+ | status | server_msg ... +-------------—+-------------—+-------------—+-------------—+ | data ... +-------------—+

Definition at line 409 of file decode.c.

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fr_tacacs_decode_proto()

static ssize_t fr_tacacs_decode_proto ( TALLOC_CTX *  ctx, fr_pair_list_t *  out, uint8_t const *  data, size_t  data_len, void *  proto_ctx  )

static

Definition at line 1069 of file decode.c.

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fr_tacacs_packet_to_code()

int fr_tacacs_packet_to_code

(

fr_tacacs_packet_t const *

pkt

)

Definition at line 36 of file decode.c.

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tacacs_decode_args()

static int tacacs_decode_args ( TALLOC_CTX *  ctx, fr_pair_list_t *  out, fr_dict_attr_t const *  parent, uint8_t  arg_cnt, uint8_t const *  argv, uint8_t const *  attrs, NDEBUG_UNUSED uint8_t const *  end  )

static

Decode a TACACS+ 'arg_N' fields.

Definition at line 181 of file decode.c.

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tacacs_decode_field()

static int tacacs_decode_field ( TALLOC_CTX *  ctx, fr_pair_list_t *  out, fr_dict_attr_t const *  da, uint8_t const **  field_data, uint16_t  field_len, uint8_t const *  end  )

static

Decode a TACACS+ field.

Definition at line 371 of file decode.c.

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Variable Documentation

tacacs_tp_decode_proto

fr_test_point_proto_decode_t tacacs_tp_decode_proto

Initial value:

= {
        .test_ctx       = decode_test_ctx,
        .func           = fr_tacacs_decode_proto
}

Definition at line 1109 of file decode.c.