[457] | 1 | /*
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| 2 | * mppe.h - Definitions for MPPE
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| 3 | *
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| 4 | * Copyright (c) 2008 Paul Mackerras. All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in
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| 15 | * the documentation and/or other materials provided with the
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| 16 | * distribution.
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| 17 | *
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| 18 | * 3. The name(s) of the authors of this software must not be used to
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| 19 | * endorse or promote products derived from this software without
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| 20 | * prior written permission.
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| 21 | *
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| 22 | * 4. Redistributions of any form whatsoever must retain the following
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| 23 | * acknowledgment:
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| 24 | * "This product includes software developed by Paul Mackerras
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| 25 | * <paulus@samba.org>".
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| 26 | *
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| 27 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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| 28 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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| 29 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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| 30 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 31 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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| 32 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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| 33 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 34 | */
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| 35 |
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| 36 | #include "netif/ppp/ppp_opts.h"
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| 37 | #if PPP_SUPPORT && MPPE_SUPPORT /* don't build if not configured for use in lwipopts.h */
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| 38 |
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| 39 | #ifndef MPPE_H
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| 40 | #define MPPE_H
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| 41 |
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| 42 | #include "netif/ppp/pppcrypt.h"
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| 43 |
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| 44 | #ifdef __cplusplus
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| 45 | extern "C" {
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| 46 | #endif
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| 47 |
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| 48 | #define MPPE_PAD 4 /* MPPE growth per frame */
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| 49 | #define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */
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| 50 |
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| 51 | /* option bits for ccp_options.mppe */
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| 52 | #define MPPE_OPT_40 0x01 /* 40 bit */
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| 53 | #define MPPE_OPT_128 0x02 /* 128 bit */
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| 54 | #define MPPE_OPT_STATEFUL 0x04 /* stateful mode */
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| 55 | /* unsupported opts */
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| 56 | #define MPPE_OPT_56 0x08 /* 56 bit */
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| 57 | #define MPPE_OPT_MPPC 0x10 /* MPPC compression */
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| 58 | #define MPPE_OPT_D 0x20 /* Unknown */
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| 59 | #define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D)
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| 60 | #define MPPE_OPT_UNKNOWN 0x40 /* Bits !defined in RFC 3078 were set */
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| 61 |
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| 62 | /*
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| 63 | * This is not nice ... the alternative is a bitfield struct though.
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| 64 | * And unfortunately, we cannot share the same bits for the option
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| 65 | * names above since C and H are the same bit. We could do a u_int32
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| 66 | * but then we have to do a lwip_htonl() all the time and/or we still need
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| 67 | * to know which octet is which.
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| 68 | */
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| 69 | #define MPPE_C_BIT 0x01 /* MPPC */
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| 70 | #define MPPE_D_BIT 0x10 /* Obsolete, usage unknown */
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| 71 | #define MPPE_L_BIT 0x20 /* 40-bit */
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| 72 | #define MPPE_S_BIT 0x40 /* 128-bit */
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| 73 | #define MPPE_M_BIT 0x80 /* 56-bit, not supported */
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| 74 | #define MPPE_H_BIT 0x01 /* Stateless (in a different byte) */
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| 75 |
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| 76 | /* Does not include H bit; used for least significant octet only. */
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| 77 | #define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT)
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| 78 |
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| 79 | /* Build a CI from mppe opts (see RFC 3078) */
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| 80 | #define MPPE_OPTS_TO_CI(opts, ci) \
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| 81 | do { \
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| 82 | u_char *ptr = ci; /* u_char[4] */ \
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| 83 | \
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| 84 | /* H bit */ \
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| 85 | if (opts & MPPE_OPT_STATEFUL) \
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| 86 | *ptr++ = 0x0; \
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| 87 | else \
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| 88 | *ptr++ = MPPE_H_BIT; \
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| 89 | *ptr++ = 0; \
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| 90 | *ptr++ = 0; \
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| 91 | \
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| 92 | /* S,L bits */ \
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| 93 | *ptr = 0; \
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| 94 | if (opts & MPPE_OPT_128) \
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| 95 | *ptr |= MPPE_S_BIT; \
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| 96 | if (opts & MPPE_OPT_40) \
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| 97 | *ptr |= MPPE_L_BIT; \
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| 98 | /* M,D,C bits not supported */ \
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| 99 | } while (/* CONSTCOND */ 0)
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| 100 |
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| 101 | /* The reverse of the above */
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| 102 | #define MPPE_CI_TO_OPTS(ci, opts) \
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| 103 | do { \
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| 104 | const u_char *ptr = ci; /* u_char[4] */ \
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| 105 | \
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| 106 | opts = 0; \
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| 107 | \
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| 108 | /* H bit */ \
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| 109 | if (!(ptr[0] & MPPE_H_BIT)) \
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| 110 | opts |= MPPE_OPT_STATEFUL; \
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| 111 | \
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| 112 | /* S,L bits */ \
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| 113 | if (ptr[3] & MPPE_S_BIT) \
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| 114 | opts |= MPPE_OPT_128; \
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| 115 | if (ptr[3] & MPPE_L_BIT) \
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| 116 | opts |= MPPE_OPT_40; \
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| 117 | \
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| 118 | /* M,D,C bits */ \
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| 119 | if (ptr[3] & MPPE_M_BIT) \
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| 120 | opts |= MPPE_OPT_56; \
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| 121 | if (ptr[3] & MPPE_D_BIT) \
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| 122 | opts |= MPPE_OPT_D; \
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| 123 | if (ptr[3] & MPPE_C_BIT) \
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| 124 | opts |= MPPE_OPT_MPPC; \
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| 125 | \
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| 126 | /* Other bits */ \
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| 127 | if (ptr[0] & ~MPPE_H_BIT) \
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| 128 | opts |= MPPE_OPT_UNKNOWN; \
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| 129 | if (ptr[1] || ptr[2]) \
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| 130 | opts |= MPPE_OPT_UNKNOWN; \
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| 131 | if (ptr[3] & ~MPPE_ALL_BITS) \
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| 132 | opts |= MPPE_OPT_UNKNOWN; \
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| 133 | } while (/* CONSTCOND */ 0)
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| 134 |
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| 135 | /* Shared MPPE padding between MSCHAP and MPPE */
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| 136 | #define SHA1_PAD_SIZE 40
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| 137 |
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| 138 | static const u8_t mppe_sha1_pad1[SHA1_PAD_SIZE] = {
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| 139 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 140 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 141 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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| 142 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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| 143 | };
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| 144 | static const u8_t mppe_sha1_pad2[SHA1_PAD_SIZE] = {
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| 145 | 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
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| 146 | 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
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| 147 | 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
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| 148 | 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2
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| 149 | };
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| 150 |
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| 151 | /*
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| 152 | * State for an MPPE (de)compressor.
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| 153 | */
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| 154 | typedef struct ppp_mppe_state {
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| 155 | lwip_arc4_context arc4;
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| 156 | u8_t master_key[MPPE_MAX_KEY_LEN];
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| 157 | u8_t session_key[MPPE_MAX_KEY_LEN];
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| 158 | u8_t keylen; /* key length in bytes */
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| 159 | /* NB: 128-bit == 16, 40-bit == 8!
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| 160 | * If we want to support 56-bit, the unit has to change to bits
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| 161 | */
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| 162 | u8_t bits; /* MPPE control bits */
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| 163 | u16_t ccount; /* 12-bit coherency count (seqno) */
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| 164 | u16_t sanity_errors; /* take down LCP if too many */
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| 165 | unsigned int stateful :1; /* stateful mode flag */
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| 166 | unsigned int discard :1; /* stateful mode packet loss flag */
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| 167 | } ppp_mppe_state;
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| 168 |
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| 169 | void mppe_set_key(ppp_pcb *pcb, ppp_mppe_state *state, u8_t *key);
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| 170 | void mppe_init(ppp_pcb *pcb, ppp_mppe_state *state, u8_t options);
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| 171 | void mppe_comp_reset(ppp_pcb *pcb, ppp_mppe_state *state);
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| 172 | err_t mppe_compress(ppp_pcb *pcb, ppp_mppe_state *state, struct pbuf **pb, u16_t protocol);
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| 173 | void mppe_decomp_reset(ppp_pcb *pcb, ppp_mppe_state *state);
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| 174 | err_t mppe_decompress(ppp_pcb *pcb, ppp_mppe_state *state, struct pbuf **pb);
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| 175 |
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| 176 | #ifdef __cplusplus
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| 177 | }
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| 178 | #endif
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| 179 |
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| 180 | #endif /* MPPE_H */
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| 181 | #endif /* PPP_SUPPORT && MPPE_SUPPORT */
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