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annotate kex.h @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 5916af64acd4
children c9b5017b0a7b
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #ifndef DROPBEAR_KEX_H_
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26 #define DROPBEAR_KEX_H_
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28 #include "includes.h"
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29 #include "algo.h"
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30 #include "signkey.h"
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31
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32 void send_msg_kexinit(void);
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33 void recv_msg_kexinit(void);
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34 void send_msg_newkeys(void);
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35 void recv_msg_newkeys(void);
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36 void kexfirstinitialise(void);
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37 void finish_kexhashbuf(void);
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39 struct kex_dh_param *gen_kexdh_param(void);
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40 void free_kexdh_param(struct kex_dh_param *param);
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41 void kexdh_comb_key(struct kex_dh_param *param, mp_int *dh_pub_them,
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42 sign_key *hostkey);
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44 #if DROPBEAR_ECDH
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45 struct kex_ecdh_param *gen_kexecdh_param(void);
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46 void free_kexecdh_param(struct kex_ecdh_param *param);
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47 void kexecdh_comb_key(struct kex_ecdh_param *param, buffer *pub_them,
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48 sign_key *hostkey);
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49 #endif
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50
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51 #if DROPBEAR_CURVE25519
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52 struct kex_curve25519_param *gen_kexcurve25519_param(void);
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53 void free_kexcurve25519_param(struct kex_curve25519_param *param);
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54 void kexcurve25519_comb_key(const struct kex_curve25519_param *param, const buffer *pub_them,
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55 sign_key *hostkey);
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56 #endif
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57
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58 #ifndef DISABLE_ZLIB
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59 int is_compress_trans(void);
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60 int is_compress_recv(void);
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61 #endif
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63 void recv_msg_kexdh_init(void); /* server */
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65 void send_msg_kexdh_init(void); /* client */
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66 void recv_msg_kexdh_reply(void); /* client */
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68 struct KEXState {
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69
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70 unsigned sentkexinit : 1; /*set when we've sent/recv kexinit packet */
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71 unsigned recvkexinit : 1;
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72 unsigned them_firstfollows : 1; /* true when first_kex_packet_follows is set */
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73 unsigned sentnewkeys : 1; /* set once we've send MSG_NEWKEYS (will be cleared once we have also received */
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74 unsigned recvnewkeys : 1; /* set once we've received MSG_NEWKEYS (cleared once we have also sent */
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75
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76 unsigned donefirstkex : 1; /* Set to 1 after the first kex has completed,
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77 ie the transport layer has been set up */
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78
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79 unsigned our_first_follows_matches : 1;
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80
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81 time_t lastkextime; /* time of the last kex */
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82 unsigned int datatrans; /* data transmitted since last kex */
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83 unsigned int datarecv; /* data received since last kex */
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84
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85 };
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86
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87 struct kex_dh_param {
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88 mp_int pub; /* e */
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89 mp_int priv; /* x */
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90 };
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91
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92 #if DROPBEAR_ECDH
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93 struct kex_ecdh_param {
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94 ecc_key key;
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95 };
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96 #endif
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97
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98 #if DROPBEAR_CURVE25519
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99 #define CURVE25519_LEN 32
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100 struct kex_curve25519_param {
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101 unsigned char priv[CURVE25519_LEN];
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102 unsigned char pub[CURVE25519_LEN];
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103 };
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104
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105 /* No header file for curve25519_donna */
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106 int curve25519_donna(unsigned char *out, const unsigned char *secret, const unsigned char *other);
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107 #endif
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108
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109
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110 #define MAX_KEXHASHBUF 2000
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111
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112 #endif /* DROPBEAR_KEX_H_ */