annotate gensignkey.c @ 1370:dd5d7b7141b9 fuzz

create fuzzer .options files
author Matt Johnston <matt@ucc.asn.au>
date Tue, 23 May 2017 22:43:52 +0800
parents bbc0a0ee3843
children 4f8eb331174f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
846
b298bb438625 refactor key generation, make it generate as required.
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parents:
diff changeset
1 #include "includes.h"
b298bb438625 refactor key generation, make it generate as required.
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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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Matt Johnston <matt@ucc.asn.au>
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6 #include "gendss.h"
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7 #include "signkey.h"
858
220f55d540ae rename random.h to dbrandom.h since some OSes have a system random.h
Matt Johnston <matt@ucc.asn.au>
parents: 857
diff changeset
8 #include "dbrandom.h"
846
b298bb438625 refactor key generation, make it generate as required.
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9
b298bb438625 refactor key generation, make it generate as required.
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10 #define RSA_DEFAULT_SIZE 2048
b298bb438625 refactor key generation, make it generate as required.
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11 #define DSS_DEFAULT_SIZE 1024
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12
857
c19acba28590 use oldstyle comments
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13 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
846
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14 static int buf_writefile(buffer * buf, const char * filename) {
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15 int ret = DROPBEAR_FAILURE;
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16 int fd = -1;
b298bb438625 refactor key generation, make it generate as required.
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17
b298bb438625 refactor key generation, make it generate as required.
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18 fd = open(filename, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
b298bb438625 refactor key generation, make it generate as required.
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19 if (fd < 0) {
b298bb438625 refactor key generation, make it generate as required.
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20 dropbear_log(LOG_ERR, "Couldn't create new file %s: %s",
b298bb438625 refactor key generation, make it generate as required.
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21 filename, strerror(errno));
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22 goto out;
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23 }
b298bb438625 refactor key generation, make it generate as required.
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24
b298bb438625 refactor key generation, make it generate as required.
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25 /* write the file now */
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26 while (buf->pos != buf->len) {
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27 int len = write(fd, buf_getptr(buf, buf->len - buf->pos),
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28 buf->len - buf->pos);
888
6e6ae84d3dba Fix check for EINTR
Matt Johnston <matt@ucc.asn.au>
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29 if (len == -1 && errno == EINTR) {
846
b298bb438625 refactor key generation, make it generate as required.
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30 continue;
b298bb438625 refactor key generation, make it generate as required.
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31 }
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32 if (len <= 0) {
b298bb438625 refactor key generation, make it generate as required.
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33 dropbear_log(LOG_ERR, "Failed writing file %s: %s",
b298bb438625 refactor key generation, make it generate as required.
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34 filename, strerror(errno));
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35 goto out;
b298bb438625 refactor key generation, make it generate as required.
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36 }
b298bb438625 refactor key generation, make it generate as required.
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37 buf_incrpos(buf, len);
b298bb438625 refactor key generation, make it generate as required.
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38 }
b298bb438625 refactor key generation, make it generate as required.
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39
b298bb438625 refactor key generation, make it generate as required.
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40 ret = DROPBEAR_SUCCESS;
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41
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42 out:
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43 if (fd >= 0) {
983
2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails
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44 if (fsync(fd) != 0) {
2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails
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45 dropbear_log(LOG_ERR, "fsync of %s failed: %s", filename, strerror(errno));
2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails
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46 }
846
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47 m_close(fd);
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48 }
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49 return ret;
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50 }
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51
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52 /* returns 0 on failure */
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53 static int get_default_bits(enum signkey_type keytype)
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54 {
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
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55 switch (keytype) {
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750ec4ec4cbe Convert #ifdef to #if, other build changes
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56 #if DROPBEAR_RSA
1250
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57 case DROPBEAR_SIGNKEY_RSA:
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58 return RSA_DEFAULT_SIZE;
846
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59 #endif
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60 #if DROPBEAR_DSS
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61 case DROPBEAR_SIGNKEY_DSS:
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62 return DSS_DEFAULT_SIZE;
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63 #endif
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64 #if DROPBEAR_ECDSA
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65 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
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66 return ECDSA_DEFAULT_SIZE;
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67 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
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68 return 521;
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69 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
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70 return 384;
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71 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
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72 return 256;
846
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73 #endif
1250
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74 default:
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75 return 0;
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76 }
846
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77 }
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78
1329
185c14fa504d Use atomic key generation in all cases
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79 /* if skip_exist is set it will silently return if the key file exists */
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80 int signkey_generate(enum signkey_type keytype, int bits, const char* filename, int skip_exist)
846
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81 {
b298bb438625 refactor key generation, make it generate as required.
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82 sign_key * key = NULL;
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83 buffer *buf = NULL;
1329
185c14fa504d Use atomic key generation in all cases
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84 char *fn_temp = NULL;
846
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85 int ret = DROPBEAR_FAILURE;
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86 if (bits == 0)
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87 {
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88 bits = get_default_bits(keytype);
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89 }
b298bb438625 refactor key generation, make it generate as required.
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parents:
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90
b298bb438625 refactor key generation, make it generate as required.
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91 /* now we can generate the key */
b298bb438625 refactor key generation, make it generate as required.
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92 key = new_sign_key();
b298bb438625 refactor key generation, make it generate as required.
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93
852
7540c0822374 Various cleanups and fixes for warnings
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parents: 847
diff changeset
94 seedrandom();
7540c0822374 Various cleanups and fixes for warnings
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diff changeset
95
846
b298bb438625 refactor key generation, make it generate as required.
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parents:
diff changeset
96 switch(keytype) {
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
97 #if DROPBEAR_RSA
846
b298bb438625 refactor key generation, make it generate as required.
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parents:
diff changeset
98 case DROPBEAR_SIGNKEY_RSA:
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
parents:
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99 key->rsakey = gen_rsa_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required.
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parents:
diff changeset
100 break;
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
102 #if DROPBEAR_DSS
846
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parents:
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103 case DROPBEAR_SIGNKEY_DSS:
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 key->dsskey = gen_dss_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required.
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parents:
diff changeset
105 break;
b298bb438625 refactor key generation, make it generate as required.
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parents:
diff changeset
106 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
107 #if DROPBEAR_ECDSA
846
b298bb438625 refactor key generation, make it generate as required.
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parents:
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108 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
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parents:
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109 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
b298bb438625 refactor key generation, make it generate as required.
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parents:
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110 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
b298bb438625 refactor key generation, make it generate as required.
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parents:
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111 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
b298bb438625 refactor key generation, make it generate as required.
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parents:
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112 {
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parents:
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113 ecc_key *ecckey = gen_ecdsa_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required.
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114 keytype = ecdsa_signkey_type(ecckey);
b298bb438625 refactor key generation, make it generate as required.
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115 *signkey_key_ptr(key, keytype) = ecckey;
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116 }
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parents:
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117 break;
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parents:
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118 #endif
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119 default:
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120 dropbear_exit("Internal error");
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121 }
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122
852
7540c0822374 Various cleanups and fixes for warnings
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parents: 847
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123 seedrandom();
7540c0822374 Various cleanups and fixes for warnings
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124
846
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125 buf = buf_new(MAX_PRIVKEY_SIZE);
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parents:
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126
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127 buf_put_priv_key(buf, key, keytype);
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128 sign_key_free(key);
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129 key = NULL;
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130 buf_setpos(buf, 0);
1329
185c14fa504d Use atomic key generation in all cases
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parents: 1295
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131
185c14fa504d Use atomic key generation in all cases
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parents: 1295
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132 fn_temp = m_malloc(strlen(filename) + 30);
185c14fa504d Use atomic key generation in all cases
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diff changeset
133 snprintf(fn_temp, strlen(filename)+30, "%s.tmp%d", filename, getpid());
185c14fa504d Use atomic key generation in all cases
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134 ret = buf_writefile(buf, fn_temp);
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135
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136 if (ret == DROPBEAR_FAILURE) {
185c14fa504d Use atomic key generation in all cases
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137 goto out;
185c14fa504d Use atomic key generation in all cases
Matt Johnston <matt@ucc.asn.au>
parents: 1295
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138 }
846
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parents:
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139
1329
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140 if (link(fn_temp, filename) < 0) {
185c14fa504d Use atomic key generation in all cases
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parents: 1295
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141 /* If generating keys on connection (skipexist) it's OK to get EEXIST
185c14fa504d Use atomic key generation in all cases
Matt Johnston <matt@ucc.asn.au>
parents: 1295
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142 - we probably just lost a race with another connection to generate the key */
185c14fa504d Use atomic key generation in all cases
Matt Johnston <matt@ucc.asn.au>
parents: 1295
diff changeset
143 if (!(skip_exist && errno == EEXIST)) {
185c14fa504d Use atomic key generation in all cases
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parents: 1295
diff changeset
144 dropbear_log(LOG_ERR, "Failed moving key file to %s: %s", filename,
185c14fa504d Use atomic key generation in all cases
Matt Johnston <matt@ucc.asn.au>
parents: 1295
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145 strerror(errno));
185c14fa504d Use atomic key generation in all cases
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parents: 1295
diff changeset
146 /* XXX fallback to non-atomic copy for some filesystems? */
185c14fa504d Use atomic key generation in all cases
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147 ret = DROPBEAR_FAILURE;
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148 goto out;
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149 }
185c14fa504d Use atomic key generation in all cases
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parents: 1295
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150 }
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parents: 1295
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151
185c14fa504d Use atomic key generation in all cases
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152 out:
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153 if (buf) {
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154 buf_burn(buf);
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155 buf_free(buf);
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156 }
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parents: 1295
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157
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158 if (fn_temp) {
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159 unlink(fn_temp);
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160 m_free(fn_temp);
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parents: 1295
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161 }
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parents: 1295
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162
846
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
parents:
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163 return ret;
b298bb438625 refactor key generation, make it generate as required.
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parents:
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164 }