23c8333d66
end-of-file checks out of the inner base64 loop, and remove the trailing whitespace stripper. The latter was added in rev 1.23 but the actual fix for the problem was in 1.24 -- b64_pton doesn't mind extra whitespace. (However there's a bogus comment in OpenSSH's uuencode.c that also mentions problems with trailing whitespace and b64_pton, but their real problem is the comment field in the key file.)
440 lines
9.8 KiB
C
440 lines
9.8 KiB
C
/*-
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. 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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* 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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* uudecode [file ...]
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*
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* create the specified file, decoding as you go.
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* used with uuencode.
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <pwd.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static const char *infile, *outfile;
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static FILE *infp, *outfp;
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static int base64, cflag, iflag, oflag, pflag, rflag, sflag;
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static void usage(void);
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static int decode(void);
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static int decode2(void);
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static int uu_decode(void);
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static int base64_decode(void);
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int
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main(int argc, char *argv[])
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{
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int rval, ch;
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if (strcmp(basename(argv[0]), "b64decode") == 0)
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base64 = 1;
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while ((ch = getopt(argc, argv, "cimo:prs")) != -1) {
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switch(ch) {
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case 'c':
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if (oflag || rflag)
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usage();
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cflag = 1; /* multiple uudecode'd files */
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break;
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case 'i':
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iflag = 1; /* ask before override files */
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break;
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case 'm':
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base64 = 1;
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break;
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case 'o':
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if (cflag || pflag || rflag || sflag)
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usage();
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oflag = 1; /* output to the specified file */
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sflag = 1; /* do not strip pathnames for output */
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outfile = optarg; /* set the output filename */
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break;
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case 'p':
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if (oflag)
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usage();
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pflag = 1; /* print output to stdout */
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break;
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case 'r':
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if (cflag || oflag)
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usage();
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rflag = 1; /* decode raw data */
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break;
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case 's':
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if (oflag)
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usage();
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sflag = 1; /* do not strip pathnames for output */
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (*argv) {
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rval = 0;
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do {
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infp = fopen(infile = *argv, "r");
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if (infp == NULL) {
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warn("%s", *argv);
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rval = 1;
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continue;
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}
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rval |= decode();
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fclose(infp);
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} while (*++argv);
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} else {
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infile = "stdin";
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infp = stdin;
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rval = decode();
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}
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exit(rval);
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}
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static int
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decode(void)
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{
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int r, v;
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if (rflag) {
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/* relaxed alternative to decode2() */
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outfile = "/dev/stdout";
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outfp = stdout;
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if (base64)
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return (base64_decode());
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else
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return (uu_decode());
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}
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v = decode2();
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if (v == EOF) {
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warnx("%s: missing or bad \"begin\" line", infile);
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return (1);
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}
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for (r = v; cflag; r |= v) {
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v = decode2();
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if (v == EOF)
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break;
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}
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return (r);
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}
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static int
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decode2(void)
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{
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int flags, fd, mode;
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size_t n, m;
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char *p, *q;
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void *handle;
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struct passwd *pw;
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struct stat st;
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char buf[MAXPATHLEN+1];
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base64 = 0;
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/* search for header line */
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for (;;) {
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if (fgets(buf, sizeof(buf), infp) == NULL)
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return (EOF);
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p = buf;
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if (strncmp(p, "begin-base64 ", 13) == 0) {
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base64 = 1;
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p += 13;
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} else if (strncmp(p, "begin ", 6) == 0)
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p += 6;
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else
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continue;
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/* p points to mode */
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q = strchr(p, ' ');
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if (q == NULL)
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continue;
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*q++ = '\0';
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/* q points to filename */
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n = strlen(q);
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while (n > 0 && (q[n-1] == '\n' || q[n-1] == '\r'))
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q[--n] = '\0';
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/* found valid header? */
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if (n > 0)
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break;
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}
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handle = setmode(p);
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if (handle == NULL) {
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warnx("%s: unable to parse file mode", infile);
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return (1);
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}
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mode = getmode(handle, 0) & 0666;
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free(handle);
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if (sflag) {
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/* don't strip, so try ~user/file expansion */
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p = NULL;
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pw = NULL;
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if (*q == '~')
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p = strchr(q, '/');
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if (p != NULL) {
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*p = '\0';
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pw = getpwnam(q + 1);
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*p = '/';
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}
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if (pw != NULL) {
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n = strlen(pw->pw_dir);
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if (buf + n > p) {
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/* make room */
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m = strlen(p);
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if (sizeof(buf) < n + m) {
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warnx("%s: bad output filename",
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infile);
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return (1);
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}
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p = memmove(buf + n, p, m);
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}
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q = memcpy(p - n, pw->pw_dir, n);
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}
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} else if (strcmp(q, "/dev/stdout") != 0) {
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/* strip down to leaf name */
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p = strrchr(q, '/');
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if (p != NULL)
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q = p + 1;
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}
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if (!oflag)
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outfile = q;
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/* POSIX says "/dev/stdout" is a 'magic cookie' not a special file. */
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if (pflag || strcmp(outfile, "/dev/stdout") == 0)
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outfp = stdout;
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else {
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flags = O_WRONLY|O_CREAT|O_EXCL;
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if (lstat(outfile, &st) == 0) {
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if (iflag) {
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warnc(EEXIST, "%s: %s", infile, outfile);
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return (0);
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}
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switch (st.st_mode & S_IFMT) {
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case S_IFREG:
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case S_IFLNK:
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/* avoid symlink attacks */
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if (unlink(outfile) == 0 || errno == ENOENT)
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break;
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warn("%s: unlink %s", infile, outfile);
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return (1);
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case S_IFDIR:
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warnc(EISDIR, "%s: %s", infile, outfile);
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return (1);
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default:
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if (oflag) {
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/* trust command-line names */
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flags &= ~O_EXCL;
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break;
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}
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warnc(EEXIST, "%s: %s", infile, outfile);
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return (1);
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}
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} else if (errno != ENOENT) {
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warn("%s: %s", infile, outfile);
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return (1);
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}
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if ((fd = open(outfile, flags, mode)) < 0 ||
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(outfp = fdopen(fd, "w")) == NULL) {
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warn("%s: %s", infile, outfile);
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return (1);
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}
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}
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if (base64)
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return (base64_decode());
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else
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return (uu_decode());
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}
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static int
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getline(char *buf, size_t size)
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{
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if (fgets(buf, size, infp) != NULL)
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return (2);
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if (!rflag)
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return (0);
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warnx("%s: %s: short file", infile, outfile);
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return (1);
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}
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static int
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checkend(const char *ptr, const char *end, const char *msg)
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{
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size_t n;
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n = strlen(end);
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if (strncmp(ptr, end, n) != 0 ||
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strspn(ptr + n, " \t\r\n") != strlen(ptr + n)) {
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warnx("%s: %s: %s", infile, outfile, msg);
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return (1);
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}
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if (fclose(outfp) != 0) {
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warn("%s: %s", infile, outfile);
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return (1);
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}
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return (0);
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}
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static int
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uu_decode(void)
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{
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int i, ch;
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char *p;
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char buf[MAXPATHLEN+1];
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/* for each input line */
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for (;;) {
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switch (getline(buf, sizeof(buf))) {
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case 0: return (0);
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case 1: return (1);
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}
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#define DEC(c) (((c) - ' ') & 077) /* single character decode */
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#define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) )
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#define OUT_OF_RANGE do { \
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warnx("%s: %s: character out of range: [%d-%d]", \
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infile, outfile, 1 + ' ', 077 + ' ' + 1); \
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return (1); \
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} while (0)
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/*
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* `i' is used to avoid writing out all the characters
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* at the end of the file.
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*/
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p = buf;
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if ((i = DEC(*p)) <= 0)
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break;
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for (++p; i > 0; p += 4, i -= 3)
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if (i >= 3) {
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if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
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IS_DEC(*(p + 2)) && IS_DEC(*(p + 3))))
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OUT_OF_RANGE;
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ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
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putc(ch, outfp);
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ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
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putc(ch, outfp);
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ch = DEC(p[2]) << 6 | DEC(p[3]);
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putc(ch, outfp);
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}
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else {
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if (i >= 1) {
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if (!(IS_DEC(*p) && IS_DEC(*(p + 1))))
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OUT_OF_RANGE;
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ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
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putc(ch, outfp);
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}
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if (i >= 2) {
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if (!(IS_DEC(*(p + 1)) &&
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IS_DEC(*(p + 2))))
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OUT_OF_RANGE;
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ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
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putc(ch, outfp);
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}
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if (i >= 3) {
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if (!(IS_DEC(*(p + 2)) &&
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IS_DEC(*(p + 3))))
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OUT_OF_RANGE;
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ch = DEC(p[2]) << 6 | DEC(p[3]);
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putc(ch, outfp);
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}
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}
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}
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switch (getline(buf, sizeof(buf))) {
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case 0: return (0);
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case 1: return (1);
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default: return (checkend(buf, "end", "no \"end\" line"));
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}
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}
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static int
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base64_decode(void)
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{
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int n;
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char inbuf[MAXPATHLEN+1];
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unsigned char outbuf[MAXPATHLEN * 4];
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for (;;) {
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switch (getline(inbuf, sizeof(inbuf))) {
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case 0: return (0);
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case 1: return (1);
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}
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n = b64_pton(inbuf, outbuf, sizeof(outbuf));
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if (n < 0)
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break;
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fwrite(outbuf, 1, n, outfp);
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}
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return (checkend(inbuf, "====",
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"error decoding base64 input stream"));
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: uudecode [-cimprs] [file ...]\n"
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" uudecode [-i] -o output_file [file]\n"
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" b64decode [-cimprs] [file ...]\n"
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" b64decode [-i] -o output_file [file]\n");
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exit(1);
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}
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