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/*-
* Copyright (c) 2014 Michihiro NAKAJIMA
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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 "archive_platform.h"
__FBSDID("$FreeBSD$");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include "archive_read_private.h"
static void
add_passphrase_to_tail(struct archive_read *a,
struct archive_read_passphrase *p)
{
*a->passphrases.last = p;
a->passphrases.last = &p->next;
p->next = NULL;
}
static struct archive_read_passphrase *
remove_passphrases_from_head(struct archive_read *a)
{
struct archive_read_passphrase *p;
p = a->passphrases.first;
if (p != NULL)
a->passphrases.first = p->next;
return (p);
}
static void
insert_passphrase_to_head(struct archive_read *a,
struct archive_read_passphrase *p)
{
p->next = a->passphrases.first;
a->passphrases.first = p;
if (&a->passphrases.first == a->passphrases.last) {
a->passphrases.last = &p->next;
p->next = NULL;
}
}
static struct archive_read_passphrase *
new_read_passphrase(struct archive_read *a, const char *passphrase)
{
struct archive_read_passphrase *p;
p = malloc(sizeof(*p));
if (p == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory");
return (NULL);
}
p->passphrase = strdup(passphrase);
if (p->passphrase == NULL) {
free(p);
archive_set_error(&a->archive, ENOMEM,
"Can't allocate memory");
return (NULL);
}
return (p);
}
int
archive_read_add_passphrase(struct archive *_a, const char *passphrase)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_passphrase *p;
archive_check_magic(_a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_NEW,
"archive_read_add_passphrase");
if (passphrase == NULL || passphrase[0] == '\0') {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Empty passphrase is unacceptable");
return (ARCHIVE_FAILED);
}
p = new_read_passphrase(a, passphrase);
if (p == NULL)
return (ARCHIVE_FATAL);
add_passphrase_to_tail(a, p);
return (ARCHIVE_OK);
}
int
archive_read_set_passphrase_callback(struct archive *_a, void *client_data,
archive_passphrase_callback *cb)
{
struct archive_read *a = (struct archive_read *)_a;
archive_check_magic(_a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_NEW,
"archive_read_set_passphrase_callback");
a->passphrases.callback = cb;
a->passphrases.client_data = client_data;
return (ARCHIVE_OK);
}
/*
* Call this in advance when you start to get a passphrase for decryption
* for a entry.
*/
void
__archive_read_reset_passphrase(struct archive_read *a)
{
a->passphrases.candidate = -1;
}
/*
* Get a passphrase for decryption.
*/
const char *
__archive_read_next_passphrase(struct archive_read *a)
{
struct archive_read_passphrase *p;
const char *passphrase;
if (a->passphrases.candidate < 0) {
/* Count out how many passphrases we have. */
int cnt = 0;
for (p = a->passphrases.first; p != NULL; p = p->next)
cnt++;
a->passphrases.candidate = cnt;
p = a->passphrases.first;
} else if (a->passphrases.candidate > 1) {
/* Rotate a passphrase list. */
a->passphrases.candidate--;
p = remove_passphrases_from_head(a);
add_passphrase_to_tail(a, p);
/* Pick a new passphrase candidate up. */
p = a->passphrases.first;
} else if (a->passphrases.candidate == 1) {
/* This case is that all candidates failed to decrypt. */
a->passphrases.candidate = 0;
if (a->passphrases.first->next != NULL) {
/* Rotate a passphrase list. */
p = remove_passphrases_from_head(a);
add_passphrase_to_tail(a, p);
}
p = NULL;
} else /* There is no passphrase candidate. */
p = NULL;
if (p != NULL)
passphrase = p->passphrase;
else if (a->passphrases.callback != NULL) {
/* Get a passphrase through a call-back function
* since we tried all passphrases out or we don't
* have it. */
passphrase = a->passphrases.callback(&a->archive,
a->passphrases.client_data);
if (passphrase != NULL) {
p = new_read_passphrase(a, passphrase);
if (p == NULL)
return (NULL);
insert_passphrase_to_head(a, p);
a->passphrases.candidate = 1;
}
} else
passphrase = NULL;
return (passphrase);
}
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