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/* $Id: fileproc.c,v 1.18 2021/07/12 15:09:20 beck Exp $ */
/*
* Copyright (c) 2016 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 AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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 <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
static int
serialise(const char *real, const char *v, size_t vsz, const char *v2, size_t v2sz)
{
int fd;
char *tmp;
/* create backup hardlink */
if (asprintf(&tmp, "%s.1", real) == -1) {
warn("asprintf");
return 0;
}
(void) unlink(tmp);
if (link(real, tmp) == -1 && errno != ENOENT) {
warn("link");
free(tmp);
return 0;
}
free(tmp);
/*
* Write into backup location, overwriting.
* Then atomically do the rename.
*/
if (asprintf(&tmp, "%s.XXXXXXXXXX", real) == -1) {
warn("asprintf");
return 0;
}
if ((fd = mkstemp(tmp)) == -1) {
warn("mkstemp");
goto out;
}
if (fchmod(fd, 0444) == -1) {
warn("fchmod");
goto out;
}
if ((ssize_t)vsz != write(fd, v, vsz)) {
warnx("write");
goto out;
}
if (v2 != NULL && write(fd, v2, v2sz) != (ssize_t)v2sz) {
warnx("write");
goto out;
}
if (close(fd) == -1)
goto out;
if (rename(tmp, real) == -1) {
warn("%s", real);
goto out;
}
free(tmp);
return 1;
out:
if (fd != -1)
close(fd);
(void) unlink(tmp);
free(tmp);
return 0;
}
int
fileproc(int certsock, const char *certdir, const char *certfile, const char
*chainfile, const char *fullchainfile)
{
char *csr = NULL, *ch = NULL;
size_t chsz, csz;
int rc = 0;
long lval;
enum fileop op;
if (unveil(certdir, "rwc") == -1) {
warn("unveil %s", certdir);
goto out;
}
/*
* rpath and cpath for rename, wpath and cpath for
* writing to the temporary. fattr for fchmod.
*/
if (pledge("stdio cpath wpath rpath fattr", NULL) == -1) {
warn("pledge");
goto out;
}
/* Read our operation. */
op = FILE__MAX;
if ((lval = readop(certsock, COMM_CHAIN_OP)) == 0)
op = FILE_STOP;
else if (lval == FILE_CREATE || lval == FILE_REMOVE)
op = lval;
if (FILE_STOP == op) {
rc = 1;
goto out;
} else if (FILE__MAX == op) {
warnx("unknown operation from certproc");
goto out;
}
/*
* If revoking certificates, just unlink the files.
* We return the special error code of 2 to indicate that the
* certificates were removed.
*/
if (FILE_REMOVE == op) {
if (certfile) {
if (unlink(certfile) == -1 && errno != ENOENT) {
warn("%s", certfile);
goto out;
} else
dodbg("%s: unlinked", certfile);
}
if (chainfile) {
if (unlink(chainfile) == -1 && errno != ENOENT) {
warn("%s", chainfile);
goto out;
} else
dodbg("%s: unlinked", chainfile);
}
if (fullchainfile) {
if (unlink(fullchainfile) == -1 && errno != ENOENT) {
warn("%s", fullchainfile);
goto out;
} else
dodbg("%s: unlinked", fullchainfile);
}
rc = 2;
goto out;
}
/*
* Start by downloading the chain PEM as a buffer.
* This is not NUL-terminated, but we're just going to guess
* that it's well-formed and not actually touch the data.
*/
if ((ch = readbuf(certsock, COMM_CHAIN, &chsz)) == NULL)
goto out;
if (chainfile) {
if (!serialise(chainfile, ch, chsz, NULL, 0))
goto out;
dodbg("%s: created", chainfile);
}
/*
* Next, wait until we receive the DER encoded (signed)
* certificate from the network process.
* This comes as a stream of bytes: we don't know how many, so
* just keep downloading.
*/
if ((csr = readbuf(certsock, COMM_CSR, &csz)) == NULL)
goto out;
if (certfile) {
if (!serialise(certfile, csr, csz, NULL, 0))
goto out;
dodbg("%s: created", certfile);
}
/*
* Finally, create the full-chain file.
* This is just the concatenation of the certificate and chain.
* We return the special error code 2 to indicate that the
* on-file certificates were changed.
*/
if (fullchainfile) {
if (!serialise(fullchainfile, csr, csz, ch,
chsz))
goto out;
dodbg("%s: created", fullchainfile);
}
rc = 2;
out:
close(certsock);
free(csr);
free(ch);
return rc;
}
|
