Mercurial > dropbear
annotate signkey.h @ 1715:3974f087d9c0
Disallow leading lines before the ident for server (#102)
Per RFC4253 4.2 clients must be able to process other lines of data
before the version string, server behavior is not defined neither
with MUST/SHOULD nor with MAY.
If server process up to 50 lines too - it may cause too long hanging
session with invalid/evil client that consume host resources and
potentially may lead to DDoS on poor embedded boxes.
Let's require first line from client to be version string and fail
early if it's not - matches both RFC and real OpenSSH behavior.
author | Vladislav Grishenko <themiron@users.noreply.github.com> |
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date | Mon, 15 Jun 2020 18:22:18 +0500 |
parents | d5cdc60db08e |
children | 35d504d59c05 |
rev | line source |
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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_SIGNKEY_H_ |
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26 #define DROPBEAR_SIGNKEY_H_ |
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27 |
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28 #include "buffer.h" |
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29 |
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30 /* Forward declarations */ |
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31 struct dropbear_DSS_Key; |
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32 struct dropbear_RSA_Key; |
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33 struct dropbear_ED25519_Key; |
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34 |
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35 /* Must match with signature_type below */ |
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36 enum signkey_type { |
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37 #if DROPBEAR_RSA |
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38 DROPBEAR_SIGNKEY_RSA, |
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39 #endif |
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40 #if DROPBEAR_DSS |
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41 DROPBEAR_SIGNKEY_DSS, |
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42 #endif |
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43 #if DROPBEAR_ECDSA |
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44 DROPBEAR_SIGNKEY_ECDSA_NISTP256, |
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45 DROPBEAR_SIGNKEY_ECDSA_NISTP384, |
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46 DROPBEAR_SIGNKEY_ECDSA_NISTP521, |
857 | 47 #endif /* DROPBEAR_ECDSA */ |
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48 #if DROPBEAR_ED25519 |
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49 DROPBEAR_SIGNKEY_ED25519, |
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50 #endif |
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51 DROPBEAR_SIGNKEY_NUM_NAMED, |
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53 DROPBEAR_SIGNKEY_ANY = 80, |
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54 DROPBEAR_SIGNKEY_NONE = 90, |
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55 }; |
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56 |
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57 /* Must match with signkey_type above, apart from rsa */ |
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58 enum signature_type { |
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59 #if DROPBEAR_DSS |
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60 DROPBEAR_SIGNATURE_DSS = DROPBEAR_SIGNKEY_DSS, |
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61 #endif |
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62 #if DROPBEAR_ECDSA |
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63 DROPBEAR_SIGNATURE_ECDSA_NISTP256 = DROPBEAR_SIGNKEY_ECDSA_NISTP256, |
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64 DROPBEAR_SIGNATURE_ECDSA_NISTP384 = DROPBEAR_SIGNKEY_ECDSA_NISTP384, |
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65 DROPBEAR_SIGNATURE_ECDSA_NISTP521 = DROPBEAR_SIGNKEY_ECDSA_NISTP521, |
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66 #endif /* DROPBEAR_ECDSA */ |
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67 #if DROPBEAR_ED25519 |
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68 DROPBEAR_SIGNATURE_ED25519 = DROPBEAR_SIGNKEY_ED25519, |
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69 #endif |
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70 #if DROPBEAR_RSA_SHA1 |
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71 DROPBEAR_SIGNATURE_RSA_SHA1 = 100, /* ssh-rsa signature (sha1) */ |
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72 #endif |
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73 #if DROPBEAR_RSA_SHA256 |
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74 DROPBEAR_SIGNATURE_RSA_SHA256 = 101, /* rsa-sha2-256 signature. has a ssh-rsa key */ |
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75 #endif |
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76 DROPBEAR_SIGNATURE_NONE = DROPBEAR_SIGNKEY_NONE, |
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77 }; |
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78 |
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79 |
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80 /* Sources for signing keys */ |
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81 typedef enum { |
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82 SIGNKEY_SOURCE_RAW_FILE, |
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83 SIGNKEY_SOURCE_AGENT, |
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84 SIGNKEY_SOURCE_INVALID, |
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85 } signkey_source; |
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86 |
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87 struct SIGN_key { |
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88 |
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90 signkey_source source; |
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91 char *filename; |
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92 |
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93 #if DROPBEAR_DSS |
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94 struct dropbear_DSS_Key * dsskey; |
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95 #endif |
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96 #if DROPBEAR_RSA |
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97 struct dropbear_RSA_Key * rsakey; |
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98 #endif |
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99 #if DROPBEAR_ECDSA |
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100 #if DROPBEAR_ECC_256 |
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101 ecc_key * ecckey256; |
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102 #endif |
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103 #if DROPBEAR_ECC_384 |
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104 ecc_key * ecckey384; |
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105 #endif |
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106 #if DROPBEAR_ECC_521 |
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107 ecc_key * ecckey521; |
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108 #endif |
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110 #if DROPBEAR_ED25519 |
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111 struct dropbear_ED25519_Key * ed25519key; |
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112 #endif |
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113 }; |
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114 |
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115 typedef struct SIGN_key sign_key; |
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116 |
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117 sign_key * new_sign_key(void); |
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118 const char* signkey_name_from_type(enum signkey_type type, unsigned int *namelen); |
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119 enum signkey_type signkey_type_from_name(const char* name, unsigned int namelen); |
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120 const char* signature_name_from_type(enum signature_type type, unsigned int *namelen); |
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121 enum signature_type signature_type_from_name(const char* name, unsigned int namelen); |
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122 enum signkey_type signkey_type_from_signature(enum signature_type sigtype); |
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123 enum signature_type signature_type_from_signkey(enum signkey_type keytype); |
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124 |
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125 int buf_get_pub_key(buffer *buf, sign_key *key, enum signkey_type *type); |
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126 int buf_get_priv_key(buffer* buf, sign_key *key, enum signkey_type *type); |
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127 void buf_put_pub_key(buffer* buf, sign_key *key, enum signkey_type type); |
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128 void buf_put_priv_key(buffer* buf, sign_key *key, enum signkey_type type); |
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129 void sign_key_free(sign_key *key); |
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130 void buf_put_sign(buffer* buf, sign_key *key, enum signature_type sigtype, const buffer *data_buf); |
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131 #if DROPBEAR_SIGNKEY_VERIFY |
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132 int buf_verify(buffer * buf, sign_key *key, enum signature_type expect_sigtype, const buffer *data_buf); |
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133 char * sign_key_fingerprint(const unsigned char* keyblob, unsigned int keybloblen); |
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134 #endif |
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135 int cmp_base64_key(const unsigned char* keyblob, unsigned int keybloblen, |
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136 const unsigned char* algoname, unsigned int algolen, |
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137 const buffer * line, char ** fingerprint); |
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138 |
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139 void** signkey_key_ptr(sign_key *key, enum signkey_type type); |
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141 #endif /* DROPBEAR_SIGNKEY_H_ */ |