1 /* $OpenBSD: tls_util.c,v 1.2 2015/02/07 23:25:37 reyk Exp $ */ 2 /* 3 * Copyright (c) 2014 Joel Sing <jsing@openbsd.org> 4 * Copyright (c) 2015 Reyk Floeter <reyk@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/stat.h> 20 21 #include <stdlib.h> 22 #include <unistd.h> 23 #include <fcntl.h> 24 25 #include "tls.h" 26 #include "tls_internal.h" 27 28 /* 29 * Extract the host and port from a colon separated value. For a literal IPv6 30 * address the address must be contained with square braces. If a host and 31 * port are successfully extracted, the function will return 0 and the 32 * caller is responsible for freeing the host and port. If no port is found 33 * then the function will return 1, with both host and port being NULL. 34 * On memory allocation failure -1 will be returned. 35 */ 36 int 37 tls_host_port(const char *hostport, char **host, char **port) 38 { 39 char *h, *p, *s; 40 int rv = 1; 41 42 *host = NULL; 43 *port = NULL; 44 45 if ((s = strdup(hostport)) == NULL) 46 goto fail; 47 48 h = p = s; 49 50 /* See if this is an IPv6 literal with square braces. */ 51 if (p[0] == '[') { 52 h++; 53 if ((p = strchr(s, ']')) == NULL) 54 goto done; 55 *p++ = '\0'; 56 } 57 58 /* Find the port seperator. */ 59 if ((p = strchr(p, ':')) == NULL) 60 goto done; 61 62 /* If there is another separator then we have issues. */ 63 if (strchr(p + 1, ':') != NULL) 64 goto done; 65 66 *p++ = '\0'; 67 68 if (asprintf(host, "%s", h) == -1) 69 goto fail; 70 if (asprintf(port, "%s", p) == -1) 71 goto fail; 72 73 rv = 0; 74 goto done; 75 76 fail: 77 free(*host); 78 *host = NULL; 79 free(*port); 80 *port = NULL; 81 rv = -1; 82 83 done: 84 free(s); 85 86 return (rv); 87 } 88 89 static int 90 tls_password_cb(char *buf, int size, int rwflag, void *u) 91 { 92 size_t len; 93 if (u == NULL) { 94 memset(buf, 0, size); 95 return (0); 96 } 97 if ((len = strlcpy(buf, u, size)) >= (size_t)size) 98 return (0); 99 return (len); 100 } 101 102 uint8_t * 103 tls_load_file(const char *name, size_t *len, char *password) 104 { 105 FILE *fp; 106 EVP_PKEY *key = NULL; 107 BIO *bio = NULL; 108 char *data, *buf = NULL; 109 struct stat st; 110 size_t size; 111 int fd = -1; 112 113 *len = 0; 114 115 if ((fd = open(name, O_RDONLY)) == -1) 116 return (NULL); 117 118 /* Just load the file into memory without decryption */ 119 if (password == NULL) { 120 if (fstat(fd, &st) != 0) 121 goto fail; 122 size = (size_t)st.st_size; 123 if ((buf = calloc(1, size + 1)) == NULL) 124 goto fail; 125 if (read(fd, buf, size) != size) 126 goto fail; 127 close(fd); 128 goto done; 129 } 130 131 /* Or read the (possibly) encrypted key from file */ 132 if ((fp = fdopen(fd, "r")) == NULL) 133 goto fail; 134 fd = -1; 135 136 key = PEM_read_PrivateKey(fp, NULL, tls_password_cb, password); 137 fclose(fp); 138 if (key == NULL) 139 goto fail; 140 141 /* Write unencrypted key to memory buffer */ 142 if ((bio = BIO_new(BIO_s_mem())) == NULL) 143 goto fail; 144 if (!PEM_write_bio_PrivateKey(bio, key, NULL, NULL, 0, NULL, NULL)) 145 goto fail; 146 if ((size = BIO_get_mem_data(bio, &data)) <= 0) 147 goto fail; 148 if ((buf = calloc(1, size)) == NULL) 149 goto fail; 150 memcpy(buf, data, size); 151 152 BIO_free_all(bio); 153 EVP_PKEY_free(key); 154 155 done: 156 *len = size; 157 return (buf); 158 159 fail: 160 free(buf); 161 if (fd != -1) 162 close(fd); 163 if (bio != NULL) 164 BIO_free_all(bio); 165 if (key != NULL) 166 EVP_PKEY_free(key); 167 168 return (NULL); 169 } 170