377 lines
7.1 KiB
C
377 lines
7.1 KiB
C
/*
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* Copyright (c) 2005 - 2006 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "hx_locl.h"
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RCSID("$ID$");
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int
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_hx509_map_file_os(const char *fn, heim_octet_string *os, struct stat *rsb)
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{
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size_t length;
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void *data;
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int ret;
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ret = _hx509_map_file(fn, &data, &length, rsb);
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os->data = data;
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os->length = length;
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return ret;
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}
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void
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_hx509_unmap_file_os(heim_octet_string *os)
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{
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_hx509_unmap_file(os->data, os->length);
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}
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int
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_hx509_map_file(const char *fn, void **data, size_t *length, struct stat *rsb)
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{
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struct stat sb;
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size_t len;
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ssize_t l;
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int ret;
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void *d;
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int fd;
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*data = NULL;
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*length = 0;
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fd = open(fn, O_RDONLY);
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if (fd < 0)
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return errno;
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if (fstat(fd, &sb) < 0) {
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ret = errno;
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close(fd);
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return ret;
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}
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len = sb.st_size;
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d = malloc(len);
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if (d == NULL) {
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close(fd);
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return ENOMEM;
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}
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l = read(fd, d, len);
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close(fd);
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if (l < 0 || l != len) {
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free(d);
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return EINVAL;
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}
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if (rsb)
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*rsb = sb;
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*data = d;
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*length = len;
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return 0;
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}
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void
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_hx509_unmap_file(void *data, size_t len)
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{
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free(data);
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}
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int
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_hx509_write_file(const char *fn, const void *data, size_t length)
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{
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ssize_t sz;
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const unsigned char *p = data;
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int fd;
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fd = open(fn, O_WRONLY|O_TRUNC|O_CREAT, 0644);
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if (fd < 0)
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return errno;
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do {
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sz = write(fd, p, length);
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if (sz < 0) {
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int saved_errno = errno;
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close(fd);
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return saved_errno;
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}
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if (sz == 0)
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break;
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length -= sz;
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} while (length > 0);
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if (close(fd) == -1)
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return errno;
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return 0;
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}
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/*
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*
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*/
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static void
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header(FILE *f, const char *type, const char *str)
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{
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fprintf(f, "-----%s %s-----\n", type, str);
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}
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int
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hx509_pem_write(hx509_context context, const char *type,
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hx509_pem_header *headers, FILE *f,
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const void *data, size_t size)
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{
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const char *p = data;
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size_t length;
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char *line;
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#define ENCODE_LINE_LENGTH 54
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header(f, "BEGIN", type);
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while (headers) {
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fprintf(f, "%s: %s\n%s",
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headers->header, headers->value,
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headers->next ? "" : "\n");
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headers = headers->next;
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}
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while (size > 0) {
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ssize_t l;
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length = size;
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if (length > ENCODE_LINE_LENGTH)
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length = ENCODE_LINE_LENGTH;
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l = base64_encode(p, length, &line);
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if (l < 0) {
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hx509_set_error_string(context, 0, ENOMEM,
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"malloc - out of memory");
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return ENOMEM;
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}
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size -= length;
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fprintf(f, "%s\n", line);
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p += length;
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free(line);
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}
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header(f, "END", type);
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return 0;
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}
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/*
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*
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*/
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int
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hx509_pem_add_header(hx509_pem_header **headers,
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const char *header, const char *value)
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{
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hx509_pem_header *h;
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h = calloc(1, sizeof(*h));
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if (h == NULL)
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return ENOMEM;
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h->header = strdup(header);
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if (h->header == NULL) {
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free(h);
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return ENOMEM;
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}
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h->value = strdup(value);
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if (h->value == NULL) {
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free(h->header);
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free(h);
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return ENOMEM;
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}
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h->next = *headers;
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*headers = h;
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return 0;
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}
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void
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hx509_pem_free_header(hx509_pem_header *headers)
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{
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hx509_pem_header *h;
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while (headers) {
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h = headers;
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headers = headers->next;
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free(h->header);
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free(h->value);
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free(h);
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}
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}
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/*
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*
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*/
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const char *
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hx509_pem_find_header(const hx509_pem_header *h, const char *header)
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{
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while(h) {
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if (strcmp(header, h->header) == 0)
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return h->value;
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h = h->next;
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}
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return NULL;
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}
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/*
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*
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*/
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int
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hx509_pem_read(hx509_context context,
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FILE *f,
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hx509_pem_read_func func,
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void *ctx)
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{
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hx509_pem_header *headers = NULL;
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char *type = NULL;
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void *data = NULL;
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size_t len = 0;
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char buf[1024];
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int ret = HX509_PARSING_KEY_FAILED;
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enum { BEFORE, SEARCHHEADER, INHEADER, INDATA, DONE } where;
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where = BEFORE;
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while (fgets(buf, sizeof(buf), f) != NULL) {
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char *p;
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int i;
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i = strcspn(buf, "\n");
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if (buf[i] == '\n') {
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buf[i] = '\0';
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if (i > 0)
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i--;
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}
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if (buf[i] == '\r') {
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buf[i] = '\0';
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if (i > 0)
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i--;
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}
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switch (where) {
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case BEFORE:
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if (strncmp("-----BEGIN ", buf, 11) == 0) {
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type = strdup(buf + 11);
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if (type == NULL)
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break;
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p = strchr(type, '-');
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if (p)
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*p = '\0';
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where = SEARCHHEADER;
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}
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break;
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case SEARCHHEADER:
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p = strchr(buf, ':');
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if (p == NULL) {
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where = INDATA;
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goto indata;
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}
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/* FALLTHOUGH */
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case INHEADER:
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if (buf[0] == '\0') {
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where = INDATA;
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break;
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}
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p = strchr(buf, ':');
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if (p) {
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*p++ = '\0';
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while (isspace((int)*p))
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p++;
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ret = hx509_pem_add_header(&headers, buf, p);
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if (ret)
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abort();
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}
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break;
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case INDATA:
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indata:
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if (strncmp("-----END ", buf, 9) == 0) {
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where = DONE;
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break;
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}
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p = emalloc(i);
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i = base64_decode(buf, p);
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if (i < 0) {
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free(p);
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goto out;
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}
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data = erealloc(data, len + i);
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memcpy(((char *)data) + len, p, i);
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free(p);
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len += i;
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break;
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case DONE:
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abort();
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}
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if (where == DONE) {
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ret = (*func)(context, type, headers, data, len, ctx);
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out:
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free(data);
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data = NULL;
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len = 0;
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free(type);
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type = NULL;
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where = BEFORE;
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hx509_pem_free_header(headers);
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headers = NULL;
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if (ret)
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break;
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}
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}
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if (where != BEFORE) {
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hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
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"File ends before end of PEM end tag");
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ret = HX509_PARSING_KEY_FAILED;
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}
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if (data)
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free(data);
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if (type)
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free(type);
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if (headers)
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hx509_pem_free_header(headers);
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return ret;
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}
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