Mercurial > dropbear
annotate gensignkey.c @ 1528:b9e4fd5a0e72 fuzz
compile fixes
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 21 Feb 2018 21:03:42 +0800 |
parents | 4f8eb331174f |
children | 7402218141d4 |
rev | line source |
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1 #include "includes.h" |
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2 #include "dbutil.h" |
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3 #include "buffer.h" |
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4 #include "ecdsa.h" |
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5 #include "genrsa.h" |
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6 #include "gendss.h" |
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7 #include "signkey.h" |
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8 #include "dbrandom.h" |
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9 |
857 | 10 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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11 static int buf_writefile(buffer * buf, const char * filename) { |
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12 int ret = DROPBEAR_FAILURE; |
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13 int fd = -1; |
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14 |
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15 fd = open(filename, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR); |
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16 if (fd < 0) { |
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17 dropbear_log(LOG_ERR, "Couldn't create new file %s: %s", |
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18 filename, strerror(errno)); |
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19 goto out; |
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20 } |
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21 |
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22 /* write the file now */ |
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23 while (buf->pos != buf->len) { |
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24 int len = write(fd, buf_getptr(buf, buf->len - buf->pos), |
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25 buf->len - buf->pos); |
888 | 26 if (len == -1 && errno == EINTR) { |
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27 continue; |
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28 } |
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29 if (len <= 0) { |
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30 dropbear_log(LOG_ERR, "Failed writing file %s: %s", |
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31 filename, strerror(errno)); |
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32 goto out; |
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33 } |
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34 buf_incrpos(buf, len); |
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35 } |
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36 |
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37 ret = DROPBEAR_SUCCESS; |
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38 |
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39 out: |
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40 if (fd >= 0) { |
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41 if (fsync(fd) != 0) { |
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42 dropbear_log(LOG_ERR, "fsync of %s failed: %s", filename, strerror(errno)); |
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43 } |
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44 m_close(fd); |
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45 } |
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46 return ret; |
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47 } |
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48 |
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49 /* returns 0 on failure */ |
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50 static int get_default_bits(enum signkey_type keytype) |
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51 { |
1250 | 52 switch (keytype) { |
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53 #if DROPBEAR_RSA |
1250 | 54 case DROPBEAR_SIGNKEY_RSA: |
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55 return DROPBEAR_DEFAULT_RSA_SIZE; |
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56 #endif |
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57 #if DROPBEAR_DSS |
1250 | 58 case DROPBEAR_SIGNKEY_DSS: |
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59 /* DSS for SSH only defines 1024 bits */ |
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60 return 1024; |
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61 #endif |
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62 #if DROPBEAR_ECDSA |
1250 | 63 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN: |
64 return ECDSA_DEFAULT_SIZE; | |
65 case DROPBEAR_SIGNKEY_ECDSA_NISTP521: | |
66 return 521; | |
67 case DROPBEAR_SIGNKEY_ECDSA_NISTP384: | |
68 return 384; | |
69 case DROPBEAR_SIGNKEY_ECDSA_NISTP256: | |
70 return 256; | |
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71 #endif |
1250 | 72 default: |
73 return 0; | |
74 } | |
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75 } |
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76 |
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77 int signkey_generate_get_bits(enum signkey_type keytype, int bits) { |
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78 if (bits == 0) |
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79 { |
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80 bits = get_default_bits(keytype); |
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81 } |
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82 return bits; |
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83 } |
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84 |
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85 /* if skip_exist is set it will silently return if the key file exists */ |
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86 int signkey_generate(enum signkey_type keytype, int bits, const char* filename, int skip_exist) |
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87 { |
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88 sign_key * key = NULL; |
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89 buffer *buf = NULL; |
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90 char *fn_temp = NULL; |
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91 int ret = DROPBEAR_FAILURE; |
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92 bits = signkey_generate_get_bits(keytype, bits); |
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93 |
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94 /* now we can generate the key */ |
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95 key = new_sign_key(); |
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96 |
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97 seedrandom(); |
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98 |
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99 switch(keytype) { |
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100 #if DROPBEAR_RSA |
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101 case DROPBEAR_SIGNKEY_RSA: |
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102 key->rsakey = gen_rsa_priv_key(bits); |
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103 break; |
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104 #endif |
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105 #if DROPBEAR_DSS |
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106 case DROPBEAR_SIGNKEY_DSS: |
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107 key->dsskey = gen_dss_priv_key(bits); |
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108 break; |
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109 #endif |
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110 #if DROPBEAR_ECDSA |
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111 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN: |
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112 case DROPBEAR_SIGNKEY_ECDSA_NISTP521: |
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113 case DROPBEAR_SIGNKEY_ECDSA_NISTP384: |
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114 case DROPBEAR_SIGNKEY_ECDSA_NISTP256: |
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115 { |
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116 ecc_key *ecckey = gen_ecdsa_priv_key(bits); |
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117 keytype = ecdsa_signkey_type(ecckey); |
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118 *signkey_key_ptr(key, keytype) = ecckey; |
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119 } |
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120 break; |
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121 #endif |
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122 default: |
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123 dropbear_exit("Internal error"); |
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124 } |
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125 |
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126 seedrandom(); |
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127 |
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128 buf = buf_new(MAX_PRIVKEY_SIZE); |
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129 |
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130 buf_put_priv_key(buf, key, keytype); |
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131 sign_key_free(key); |
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132 key = NULL; |
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133 buf_setpos(buf, 0); |
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134 |
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135 fn_temp = m_malloc(strlen(filename) + 30); |
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136 snprintf(fn_temp, strlen(filename)+30, "%s.tmp%d", filename, getpid()); |
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137 ret = buf_writefile(buf, fn_temp); |
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138 |
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139 if (ret == DROPBEAR_FAILURE) { |
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140 goto out; |
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141 } |
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142 |
1329
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143 if (link(fn_temp, filename) < 0) { |
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144 /* If generating keys on connection (skipexist) it's OK to get EEXIST |
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145 - we probably just lost a race with another connection to generate the key */ |
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146 if (!(skip_exist && errno == EEXIST)) { |
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147 dropbear_log(LOG_ERR, "Failed moving key file to %s: %s", filename, |
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148 strerror(errno)); |
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149 /* XXX fallback to non-atomic copy for some filesystems? */ |
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150 ret = DROPBEAR_FAILURE; |
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151 goto out; |
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152 } |
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153 } |
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154 |
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155 out: |
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156 if (buf) { |
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157 buf_burn(buf); |
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158 buf_free(buf); |
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159 } |
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160 |
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161 if (fn_temp) { |
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162 unlink(fn_temp); |
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163 m_free(fn_temp); |
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164 } |
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165 |
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166 return ret; |
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167 } |