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annotate signkey_ossh.c @ 1913:38c6fd7d7a82

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Fix dropbearconvert ecdsa parsing error typo Simplify handling for different key types
author Matt Johnston <matt@ucc.asn.au>
date Tue, 29 Mar 2022 23:55:35 +0800
parents ced53051e200
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1908
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1 #include "includes.h"
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2 #include "dbutil.h"
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3 #include "ssh.h"
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4 #include "signkey_ossh.h"
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5 #include "bignum.h"
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6 #include "ecdsa.h"
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7 #include "sk-ecdsa.h"
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8 #include "sk-ed25519.h"
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9 #include "rsa.h"
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10 #include "dss.h"
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11 #include "ed25519.h"
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12
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13 #if DROPBEAR_RSA
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14 /* OpenSSH raw private RSA format is
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15 string "ssh-rsa"
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16 mpint n
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17 mpint e
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18 mpint d
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19 mpint iqmp (q^-1) mod p
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20 mpint p
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21 mpint q
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22 */
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23
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24 void buf_put_rsa_priv_ossh(buffer *buf, const sign_key *akey) {
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25 const dropbear_rsa_key *key = akey->rsakey;
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26 mp_int iqmp;
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27
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28 dropbear_assert(key != NULL);
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29 if (!(key->p && key->q)) {
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30 dropbear_exit("Pre-0.33 Dropbear keys cannot be converted to OpenSSH keys.\n");
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31 }
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32
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33 m_mp_init(&iqmp);
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34 /* iqmp = (q^-1) mod p */
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35 if (mp_invmod(key->q, key->p, &iqmp) != MP_OKAY) {
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36 dropbear_exit("Bignum error for iqmp\n");
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37 }
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38 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
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39 buf_putmpint(buf, key->n);
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40 buf_putmpint(buf, key->e);
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41 buf_putmpint(buf, key->d);
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42 buf_putmpint(buf, &iqmp);
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43 buf_putmpint(buf, key->p);
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44 buf_putmpint(buf, key->q);
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45 mp_clear(&iqmp);
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46 }
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47
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48 int buf_get_rsa_priv_ossh(buffer *buf, sign_key *akey) {
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49 int ret = DROPBEAR_FAILURE;
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50 dropbear_rsa_key *key = NULL;
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51 mp_int iqmp;
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52
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53 rsa_key_free(akey->rsakey);
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54 akey->rsakey = m_malloc(sizeof(*akey->rsakey));
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55 key = akey->rsakey;
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56 m_mp_alloc_init_multi(&key->e, &key->n, &key->d, &key->p, &key->q, NULL);
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57
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58 buf_eatstring(buf);
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59 m_mp_init(&iqmp);
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60 if (buf_getmpint(buf, key->n) == DROPBEAR_SUCCESS
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61 && buf_getmpint(buf, key->e) == DROPBEAR_SUCCESS
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62 && buf_getmpint(buf, key->d) == DROPBEAR_SUCCESS
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63 && buf_getmpint(buf, &iqmp) == DROPBEAR_SUCCESS
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64 && buf_getmpint(buf, key->p) == DROPBEAR_SUCCESS
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65 && buf_getmpint(buf, key->q) == DROPBEAR_SUCCESS) {
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66 ret = DROPBEAR_SUCCESS;
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67 }
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68 mp_clear(&iqmp);
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69 return ret;
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70 }
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71
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72 #endif /* DROPBEAR_RSA */
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73
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74 #if DROPBEAR_ED25519
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75 /* OpenSSH raw private ed25519 format is
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76 string "ssh-ed25519"
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77 uint32 32
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78 byte[32] pubkey
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79 uint32 64
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80 byte[32] privkey
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81 byte[32] pubkey
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82 */
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83
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84 void buf_put_ed25519_priv_ossh(buffer *buf, const sign_key *akey) {
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85 const dropbear_ed25519_key *key = akey->ed25519key;
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86 dropbear_assert(key != NULL);
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87 buf_putstring(buf, SSH_SIGNKEY_ED25519, SSH_SIGNKEY_ED25519_LEN);
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88 buf_putint(buf, CURVE25519_LEN);
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89 buf_putbytes(buf, key->pub, CURVE25519_LEN);
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90 buf_putint(buf, CURVE25519_LEN*2);
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91 buf_putbytes(buf, key->priv, CURVE25519_LEN);
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92 buf_putbytes(buf, key->pub, CURVE25519_LEN);
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93 }
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94
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95 int buf_get_ed25519_priv_ossh(buffer *buf, sign_key *akey) {
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96 dropbear_ed25519_key *key = NULL;
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97 uint32_t len;
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98
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99 ed25519_key_free(akey->ed25519key);
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100 akey->ed25519key = m_malloc(sizeof(*akey->ed25519key));
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101 key = akey->ed25519key;
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102
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103 /* Parse past the first string and pubkey */
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104 if (buf_get_ed25519_pub_key(buf, key, DROPBEAR_SIGNKEY_ED25519)
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105 == DROPBEAR_FAILURE) {
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106 dropbear_log(LOG_ERR, "Error parsing ed25519 key, pubkey");
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107 return DROPBEAR_FAILURE;
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108 }
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109 len = buf_getint(buf);
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110 if (len != 2*CURVE25519_LEN) {
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111 dropbear_log(LOG_ERR, "Error parsing ed25519 key, bad length");
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112 return DROPBEAR_FAILURE;
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113 }
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114 memcpy(key->priv, buf_getptr(buf, CURVE25519_LEN), CURVE25519_LEN);
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115 buf_incrpos(buf, CURVE25519_LEN);
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116
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117 /* Sanity check */
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118 if (memcmp(buf_getptr(buf, CURVE25519_LEN), key->pub,
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119 CURVE25519_LEN) != 0) {
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120 dropbear_log(LOG_ERR, "Error parsing ed25519 key, mismatch pubkey");
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121 return DROPBEAR_FAILURE;
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122 }
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123 return DROPBEAR_SUCCESS;
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124 }
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125 #endif /* DROPBEAR_ED255219 */
1911
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126
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127 #if DROPBEAR_ECDSA
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128 /* OpenSSH raw private ecdsa format is the same as Dropbear's.
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129 # First part is the same as the SSH wire pubkey format
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130 string "ecdsa-sha2-[identifier]"
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131 string [identifier]
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132 string Q
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133 # With private part appended
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134 mpint d
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135 */
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136
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137 void buf_put_ecdsa_priv_ossh(buffer *buf, const sign_key *key) {
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138 ecc_key **eck = (ecc_key**)signkey_key_ptr((sign_key*)key, key->type);
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139 if (eck && *eck) {
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140 buf_put_ecdsa_priv_key(buf, *eck);
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141 return;
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142 }
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143 dropbear_exit("ecdsa key is not set");
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144 }
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145
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146 int buf_get_ecdsa_priv_ossh(buffer *buf, sign_key *key) {
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147 ecc_key **eck = (ecc_key**)signkey_key_ptr(key, key->type);
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148 if (eck) {
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149 if (*eck) {
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150 ecc_free(*eck);
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151 m_free(*eck);
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152 *eck = NULL;
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153 }
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154 *eck = buf_get_ecdsa_priv_key(buf);
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155 if (*eck) {
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156 return DROPBEAR_SUCCESS;
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157 }
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158 }
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159 return DROPBEAR_FAILURE;
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160 }
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161 #endif /* DROPBEAR_ECDSA */