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/* $OpenBSD: tal.c,v 1.8 2019/10/31 08:36:43 claudio Exp $ */
/*
* Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
*
* 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 <netinet/in.h>
#include <assert.h>
#include <err.h>
#include <libgen.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/x509.h>
#include "extern.h"
/*
* Inner function for parsing RFC 7730 from a buffer.
* Returns a valid pointer on success, NULL otherwise.
* The pointer must be freed with tal_free().
*/
static struct tal *
tal_parse_buffer(const char *fn, char *buf)
{
char *nl, *line;
unsigned char *b64 = NULL;
size_t sz;
ssize_t linelen;
int rc = 0, b64sz;
struct tal *tal = NULL;
enum rtype rp;
EVP_PKEY *pkey = NULL;
if ((tal = calloc(1, sizeof(struct tal))) == NULL)
err(EXIT_FAILURE, NULL);
/* Begin with the URI section, comment section already removed. */
while ((nl = strchr(buf, '\n')) != NULL) {
line = buf;
*nl = '\0';
/* advance buffer to next line */
buf = nl + 1;
/* Zero-length line is end of section. */
if (*line == '\0')
break;
/* Append to list of URIs. */
tal->uri = reallocarray(tal->uri,
tal->urisz + 1, sizeof(char *));
if (tal->uri == NULL)
err(EXIT_FAILURE, NULL);
tal->uri[tal->urisz] = strdup(line);
if (tal->uri[tal->urisz] == NULL)
err(EXIT_FAILURE, NULL);
tal->urisz++;
/* Make sure we're a proper rsync URI. */
if (!rsync_uri_parse(NULL, NULL,
NULL, NULL, NULL, NULL, &rp, line)) {
warnx("%s: RFC 7730 section 2.1: "
"failed to parse URL: %s", fn, line);
goto out;
}
if (rp != RTYPE_CER) {
warnx("%s: RFC 7730 section 2.1: "
"not a certificate URL: %s", fn, line);
goto out;
}
}
if (tal->urisz == 0) {
warnx("%s: no URIs in manifest part", fn);
goto out;
} else if (tal->urisz > 1)
warnx("%s: multiple URIs: using the first", fn);
sz = strlen(buf);
if (sz == 0) {
warnx("%s: RFC 7730 section 2.1: subjectPublicKeyInfo: "
"zero-length public key", fn);
goto out;
}
/* Now the BASE64-encoded public key. */
sz = ((sz + 2) / 3) * 4 + 1;
if ((b64 = malloc(sz)) == NULL)
err(EXIT_FAILURE, NULL);
if ((b64sz = b64_pton(buf, b64, sz)) < 0)
errx(EXIT_FAILURE, "b64_pton");
tal->pkey = b64;
tal->pkeysz = b64sz;
/* Make sure it's a valid public key. */
pkey = d2i_PUBKEY(NULL, (const unsigned char **)&b64, b64sz);
if (pkey == NULL) {
cryptowarnx("%s: RFC 7730 section 2.1: subjectPublicKeyInfo: "
"failed public key parse", fn);
goto out;
}
rc = 1;
out:
if (rc == 0) {
tal_free(tal);
tal = NULL;
}
EVP_PKEY_free(pkey);
return tal;
}
/*
* Parse a TAL from a file conformant to RFC 7730.
* Returns the encoded data or NULL on failure.
* Failure can be any number of things: failure to open file, allocate
* memory, bad syntax, etc.
*/
struct tal *
tal_parse(const char *fn, char *buf)
{
struct tal *p;
char *d;
size_t dlen;
p = tal_parse_buffer(fn, buf);
/* extract the TAL basename (without .tal suffix) */
d = basename(fn);
if (d == NULL)
err(EXIT_FAILURE, "%s: basename", fn);
dlen = strlen(d);
if (strcasecmp(d + dlen - 4, ".tal") == 0)
dlen -= 4;
if ((p->descr = malloc(dlen + 1)) == NULL)
err(EXIT_FAILURE, NULL);
memcpy(p->descr, d, dlen);
p->descr[dlen] = 0;
return p;
}
/*
* Free a TAL pointer.
* Safe to call with NULL.
*/
void
tal_free(struct tal *p)
{
size_t i;
if (p == NULL)
return;
if (p->uri != NULL)
for (i = 0; i < p->urisz; i++)
free(p->uri[i]);
free(p->pkey);
free(p->uri);
free(p->descr);
free(p);
}
/*
* Buffer TAL parsed contents for writing.
* See tal_read() for the other side of the pipe.
*/
void
tal_buffer(char **b, size_t *bsz, size_t *bmax, const struct tal *p)
{
size_t i;
io_buf_buffer(b, bsz, bmax, p->pkey, p->pkeysz);
io_str_buffer(b, bsz, bmax, p->descr);
io_simple_buffer(b, bsz, bmax, &p->urisz, sizeof(size_t));
for (i = 0; i < p->urisz; i++)
io_str_buffer(b, bsz, bmax, p->uri[i]);
}
/*
* Read parsed TAL contents from descriptor.
* See tal_buffer() for the other side of the pipe.
* A returned pointer must be freed with tal_free().
*/
struct tal *
tal_read(int fd)
{
size_t i;
struct tal *p;
if ((p = calloc(1, sizeof(struct tal))) == NULL)
err(EXIT_FAILURE, NULL);
io_buf_read_alloc(fd, (void **)&p->pkey, &p->pkeysz);
assert(p->pkeysz > 0);
io_str_read(fd, &p->descr);
io_simple_read(fd, &p->urisz, sizeof(size_t));
assert(p->urisz > 0);
if ((p->uri = calloc(p->urisz, sizeof(char *))) == NULL)
err(EXIT_FAILURE, NULL);
for (i = 0; i < p->urisz; i++)
io_str_read(fd, &p->uri[i]);
return p;
}
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