dropbear: gensignkey.c annotate

annotate gensignkey.c @ 1884:75d6a9faf919

Merge pull request #151 from HansH111/pubkeyinfo

author	Matt Johnston <matt@ucc.asn.au>
date	Wed, 16 Mar 2022 10:43:24 +0800
parents	c795520269f9
children	8b4274d34fe8

rev	line source
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 #include "includes.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 #include "dbutil.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 #include "buffer.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 #include "ecdsa.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 #include "genrsa.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 #include "gendss.h"
1659 d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	7 #include "gened25519.h"
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 #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	9 #include "dbrandom.h"
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	11 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
1663 c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	12 static int buf_writefile(buffer * buf, const char * filename, int skip_exist) {
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 int ret = DROPBEAR_FAILURE;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 int fd = -1;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 fd = open(filename, O_RDWR \| O_CREAT \| O_EXCL, S_IRUSR \| S_IWUSR);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 if (fd < 0) {
1663 c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	18 /* If generating keys on connection (skip_exist) it's OK to get EEXIST
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	19 - we probably just lost a race with another connection to generate the key */
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	20 if (skip_exist && errno == EEXIST) {
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	21 ret = DROPBEAR_SUCCESS;
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	22 } else {
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	23 dropbear_log(LOG_ERR, "Couldn't create new file %s: %s",
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	24 filename, strerror(errno));
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	25 }
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	26
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 goto out;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 /* write the file now */
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 while (buf->pos != buf->len) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 int len = write(fd, buf_getptr(buf, buf->len - buf->pos),
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 buf->len - buf->pos);
888 6e6ae84d3dba Fix check for EINTR Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	34 if (len == -1 && errno == EINTR) {
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 continue;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 if (len <= 0) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 dropbear_log(LOG_ERR, "Failed writing file %s: %s",
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39 filename, strerror(errno));
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 goto out;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 buf_incrpos(buf, len);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 ret = DROPBEAR_SUCCESS;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 out:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 if (fd >= 0) {
983 2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails Matt Johnston <matt@ucc.asn.au> parents: 982 diff changeset	49 if (fsync(fd) != 0) {
2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails Matt Johnston <matt@ucc.asn.au> parents: 982 diff changeset	50 dropbear_log(LOG_ERR, "fsync of %s failed: %s", filename, strerror(errno));
2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails Matt Johnston <matt@ucc.asn.au> parents: 982 diff changeset	51 }
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 m_close(fd);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 return ret;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 /* returns 0 on failure */
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58 static int get_default_bits(enum signkey_type keytype)
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 {
1250 2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	60 switch (keytype) {
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	61 #if DROPBEAR_RSA
1250 2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	62 case DROPBEAR_SIGNKEY_RSA:
1438 4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	63 return DROPBEAR_DEFAULT_RSA_SIZE;
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	65 #if DROPBEAR_DSS
1250 2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	66 case DROPBEAR_SIGNKEY_DSS:
1438 4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	67 /* DSS for SSH only defines 1024 bits */
4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	68 return 1024;
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	70 #if DROPBEAR_ECDSA
1250 2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	71 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	72 return ECDSA_DEFAULT_SIZE;
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	73 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	74 return 521;
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	75 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	76 return 384;
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	77 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	78 return 256;
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79 #endif
1659 d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	80 #if DROPBEAR_ED25519
d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	81 case DROPBEAR_SIGNKEY_ED25519:
d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	82 return 256;
d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	83 #endif
1250 2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	84 default:
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	85 return 0;
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 983 diff changeset	86 }
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	87 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	88
1438 4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	89 int signkey_generate_get_bits(enum signkey_type keytype, int bits) {
4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	90 if (bits == 0)
4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	91 {
4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	92 bits = get_default_bits(keytype);
4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	93 }
4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	94 return bits;
4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	95 }
4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	96
1329 185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	97 /* if skip_exist is set it will silently return if the key file exists */
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	98 int signkey_generate(enum signkey_type keytype, int bits, const char* filename, int skip_exist)
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	100 sign_key * key = NULL;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 buffer *buf = NULL;
1329 185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	102 char *fn_temp = NULL;
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 int ret = DROPBEAR_FAILURE;
1438 4f8eb331174f add configuration option for default RSA size. Matt Johnston <matt@ucc.asn.au> parents: 1343 diff changeset	104 bits = signkey_generate_get_bits(keytype, bits);
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 /* now we can generate the key */
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107 key = new_sign_key();
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	109 seedrandom();
7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	110
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 switch(keytype) {
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	112 #if DROPBEAR_RSA
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 case DROPBEAR_SIGNKEY_RSA:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 key->rsakey = gen_rsa_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	117 #if DROPBEAR_DSS
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118 case DROPBEAR_SIGNKEY_DSS:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119 key->dsskey = gen_dss_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	120 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	122 #if DROPBEAR_ECDSA
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	124 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128 ecc_key *ecckey = gen_ecdsa_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 keytype = ecdsa_signkey_type(ecckey);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	130 *signkey_key_ptr(key, keytype) = ecckey;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133 #endif
1659 d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	134 #if DROPBEAR_ED25519
d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	135 case DROPBEAR_SIGNKEY_ED25519:
d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	136 key->ed25519key = gen_ed25519_priv_key(bits);
d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	137 break;
d32bcb5c557d Add Ed25519 support (#91) Vladislav Grishenko <themiron@users.noreply.github.com> parents: 1658 diff changeset	138 #endif
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	139 default:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	140 dropbear_exit("Internal error");
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	141 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	143 seedrandom();
7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	144
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 buf = buf_new(MAX_PRIVKEY_SIZE);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147 buf_put_priv_key(buf, key, keytype);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	148 sign_key_free(key);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	149 key = NULL;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	150 buf_setpos(buf, 0);
1329 185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	151
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	152 fn_temp = m_malloc(strlen(filename) + 30);
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	153 snprintf(fn_temp, strlen(filename)+30, "%s.tmp%d", filename, getpid());
1663 c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	154 ret = buf_writefile(buf, fn_temp, 0);
1329 185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	155
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	156 if (ret == DROPBEAR_FAILURE) {
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	157 goto out;
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	158 }
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159
1329 185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	160 if (link(fn_temp, filename) < 0) {
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	161 /* 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 diff changeset	162 - 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	163 if (!(skip_exist && errno == EEXIST)) {
1663 c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	164 if (errno == EPERM \|\| errno == EACCES) {
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	165 /* Non-atomic fallback when hard-links not allowed or unsupported */
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	166 buf_setpos(buf, 0);
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	167 ret = buf_writefile(buf, filename, skip_exist);
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	168 } else {
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	169 dropbear_log(LOG_ERR, "Failed moving key file to %s: %s", filename,
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	170 strerror(errno));
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	171 ret = DROPBEAR_FAILURE;
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	172 }
c795520269f9 Fallback for key gen without hard link support (#89) Matt Robinson <git@nerdoftheherd.com> parents: 1659 diff changeset	173
1329 185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	174 goto out;
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	175 }
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	176 }
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	177
1658 7402218141d4 bring back fsync_parent_dir Matt Johnston <matt@ucc.asn.au> parents: 1438 diff changeset	178 /* ensure directory update is flushed to disk, otherwise we can end up
7402218141d4 bring back fsync_parent_dir Matt Johnston <matt@ucc.asn.au> parents: 1438 diff changeset	179 with zero-byte hostkey files if the power goes off */
7402218141d4 bring back fsync_parent_dir Matt Johnston <matt@ucc.asn.au> parents: 1438 diff changeset	180 fsync_parent_dir(filename);
7402218141d4 bring back fsync_parent_dir Matt Johnston <matt@ucc.asn.au> parents: 1438 diff changeset	181
1329 185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	182 out:
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	183 if (buf) {
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	184 buf_burn(buf);
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	185 buf_free(buf);
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	186 }
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	187
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	188 if (fn_temp) {
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	189 unlink(fn_temp);
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	190 m_free(fn_temp);
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	191 }
185c14fa504d Use atomic key generation in all cases Matt Johnston <matt@ucc.asn.au> parents: 1295 diff changeset	192
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	193 return ret;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 }

Mercurial > dropbear

annotate gensignkey.c @ 1884:75d6a9faf919