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Diffstat (limited to '')
| -rw-r--r-- | tls_util.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/tls_util.c b/tls_util.c new file mode 100644 index 0000000..b144fb1 --- /dev/null +++ b/tls_util.c @@ -0,0 +1,225 @@ +/* $OpenBSD: tls_util.c,v 1.14 2019/04/13 18:47:58 tb Exp $ */ +/* + * Copyright (c) 2014 Joel Sing <jsing@openbsd.org> + * Copyright (c) 2014 Ted Unangst <tedu@openbsd.org> + * Copyright (c) 2015 Reyk Floeter <reyk@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/stat.h> + +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> + +#include "tls.h" +#include "tls_internal.h" + +static void * +memdup(const void *in, size_t len) +{ + void *out; + + if ((out = malloc(len)) == NULL) + return NULL; + memcpy(out, in, len); + return out; +} + +int +tls_set_mem(char **dest, size_t *destlen, const void *src, size_t srclen) +{ + free(*dest); + *dest = NULL; + *destlen = 0; + if (src != NULL) { + if ((*dest = memdup(src, srclen)) == NULL) + return -1; + *destlen = srclen; + } + return 0; +} + +int +tls_set_string(const char **dest, const char *src) +{ + free((char *)*dest); + *dest = NULL; + if (src != NULL) + if ((*dest = strdup(src)) == NULL) + return -1; + return 0; +} + +/* + * Extract the host and port from a colon separated value. For a literal IPv6 + * address the address must be contained with square braces. If a host and + * port are successfully extracted, the function will return 0 and the + * caller is responsible for freeing the host and port. If no port is found + * then the function will return 1, with both host and port being NULL. + * On memory allocation failure -1 will be returned. + */ +int +tls_host_port(const char *hostport, char **host, char **port) +{ + char *h, *p, *s; + int rv = 1; + + *host = NULL; + *port = NULL; + + if ((s = strdup(hostport)) == NULL) + goto err; + + h = p = s; + + /* See if this is an IPv6 literal with square braces. */ + if (p[0] == '[') { + h++; + if ((p = strchr(s, ']')) == NULL) + goto done; + *p++ = '\0'; + } + + /* Find the port seperator. */ + if ((p = strchr(p, ':')) == NULL) + goto done; + + /* If there is another separator then we have issues. */ + if (strchr(p + 1, ':') != NULL) + goto done; + + *p++ = '\0'; + + if (asprintf(host, "%s", h) == -1) { + *host = NULL; + goto err; + } + if (asprintf(port, "%s", p) == -1) { + *port = NULL; + goto err; + } + + rv = 0; + goto done; + + err: + free(*host); + *host = NULL; + free(*port); + *port = NULL; + rv = -1; + + done: + free(s); + + return (rv); +} + +int +tls_password_cb(char *buf, int size, int rwflag, void *u) +{ + size_t len; + + if (size < 0) + return (0); + + if (u == NULL) { + memset(buf, 0, size); + return (0); + } + + if ((len = strlcpy(buf, u, size)) >= (size_t)size) + return (0); + + return (len); +} + +uint8_t * +tls_load_file(const char *name, size_t *len, char *password) +{ + FILE *fp; + EVP_PKEY *key = NULL; + BIO *bio = NULL; + char *data; + uint8_t *buf = NULL; + struct stat st; + size_t size = 0; + int fd = -1; + ssize_t n; + + *len = 0; + + if ((fd = open(name, O_RDONLY)) == -1) + return (NULL); + + /* Just load the file into memory without decryption */ + if (password == NULL) { + if (fstat(fd, &st) != 0) + goto err; + if (st.st_size < 0) + goto err; + size = (size_t)st.st_size; + if ((buf = malloc(size)) == NULL) + goto err; + n = read(fd, buf, size); + if (n < 0 || (size_t)n != size) + goto err; + close(fd); + goto done; + } + + /* Or read the (possibly) encrypted key from file */ + if ((fp = fdopen(fd, "r")) == NULL) + goto err; + fd = -1; + + key = PEM_read_PrivateKey(fp, NULL, tls_password_cb, password); + fclose(fp); + if (key == NULL) + goto err; + + /* Write unencrypted key to memory buffer */ + if ((bio = BIO_new(BIO_s_mem())) == NULL) + goto err; + if (!PEM_write_bio_PrivateKey(bio, key, NULL, NULL, 0, NULL, NULL)) + goto err; + if ((size = BIO_get_mem_data(bio, &data)) <= 0) + goto err; + if ((buf = malloc(size)) == NULL) + goto err; + memcpy(buf, data, size); + + BIO_free_all(bio); + EVP_PKEY_free(key); + + done: + *len = size; + return (buf); + + err: + if (fd != -1) + close(fd); + freezero(buf, size); + BIO_free_all(bio); + EVP_PKEY_free(key); + + return (NULL); +} + +void +tls_unload_file(uint8_t *buf, size_t len) +{ + freezero(buf, len); +} |