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/* $OpenBSD: sha1.c,v 1.3 2001/11/26 05:04:33 deraadt Exp $ */
/*-
* Copyright (c) 1999 Marc Espie.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Marc Espie for the OpenBSD
* Project.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
* PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <sha1.h>
#include "stand.h"
#include "gzip.h"
#include "extern.h"
/* private context for sha1 signature checker */
struct sha1_checker {
SHA1_CTX context;
const char *id;
const char *filename;
};
#define SHA1_TEMPLATE "SHA1 (%s) = "
#define BUFSIZE (MAXID+sizeof(SHA1_TEMPLATE)+2*SHA1_DIGESTSIZE+1)
/* Finalize SHA1 checksum for our sha1_context into result
(size at least BUFSIZE). Returns the length of the checksum
marker, e.g., SHA1 (id) = xxxxxxxxx
^here
Return 0 for errors.
*/
size_t
sha1_build_checksum(result, n)
char *result;
struct sha1_checker *n;
{
size_t length;
sprintf(result, "SHA1 (%s) = ", n->id);
length = strlen(result);
SHA1End(&n->context, result + length);
strcat(result, "\n");
free(n);
return length;
}
void *
new_sha1_checker(h, sign, userid, envp, filename)
struct mygzip_header *h;
struct signature *sign;
const char *userid;
char *envp[];
/*@observer@*/const char *filename;
{
struct sha1_checker *n;
assert(sign->type == TAG_SHA1);
/* make sure data conforms to what we can handle */
if (sign->length > MAXID || sign->data[sign->length-1] != '\0') {
pwarnx("Corrupted SHA1 header in %s", filename);
return 0;
}
n = malloc(sizeof *n);
if (n == NULL) {
pwarnx("Can't allocate sha1_checker");
return NULL;
}
SHA1Init(&n->context);
n->id = sign->data;
n->filename = filename;
/* copy header, as this is a checksum, we don't strip our own marker */
if (gzip_copy_header(h, sign, sha1_add, n) == 0) {
pwarnx("Unexpected header in %s", filename);
free(n);
return 0;
}
return n;
}
void
sha1_add(arg, buffer, length)
void *arg;
const char *buffer;
size_t length;
{
struct sha1_checker *n = arg;
SHA1Update(&n->context, buffer, length);
}
int
sha1_sign_ok(arg)
void *arg;
{
struct sha1_checker *n = arg;
char buffer[BUFSIZE];
char scan[BUFSIZE];
size_t length;
FILE *f;
int tag_found;
length = sha1_build_checksum(buffer, n);
f= fopen(SHA1_DB_NAME, "r");
tag_found = 0;
if (f == NULL) {
warn("Can't access checksum file %s", SHA1_DB_NAME);
return PKG_BADSIG;
}
while (fgets(scan, sizeof(scan), f) != NULL) {
if (strcmp(scan, buffer) == 0) {
fprintf(stderr, "Checksum ok\n");
return PKG_GOODSIG;
}
if (strncmp(scan, buffer, length) == 0)
tag_found = 1;
}
if (tag_found) {
pwarnx("Checksum incorrect for %s (%s)", n->filename, n->id);
return PKG_BADSIG;
} else {
pwarnx("No checksum found for %s (%s)", n->filename, n->id);
return PKG_SIGUNKNOWN;
}
}
int
retrieve_sha1_marker(filename, sign, userid)
const char *filename;
struct signature **sign;
const char *userid;
{
struct signature *n;
struct mygzip_header h;
FILE *f;
char buffer[1024];
char result[BUFSIZE];
ssize_t length;
struct sha1_checker *checker;
struct signature *old;
*sign = NULL;
if (userid == NULL)
return 0;
n = malloc(sizeof *n);
if (n == NULL)
return 0;
n->data = (char *)userid;
n->length = strlen(n->data)+1;
n->type = TAG_SHA1;
memcpy(n->tag, sha1tag, sizeof sha1tag);
sign_fill_tag(n);
f = fopen(filename, "r");
if (f == NULL) {
free(n);
return 0;
}
if (gzip_read_header(f, &h, sign) == GZIP_NOT_GZIP) {
pwarnx("File %s is not a gzip file\n", filename);
fclose(f);
free(n);
return 0;
}
n->next = *sign;
*sign = n;
checker = new_sha1_checker(&h, *sign, NULL, NULL, filename);
while ((length = fread(buffer, 1, sizeof buffer, f)) > 0)
sha1_add(checker, buffer, length);
if (fclose(f) != 0 || length == -1) {
warn("Problem checksumming %s", filename);
*sign = n->next;
free(n);
return 0;
}
(void)sha1_build_checksum(result, checker);
fputs(result, stderr);
return 1;
}
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