As a trick to be able to access all files passed in arguments (readonly) within the sandbox we first open the root directory, then consider all files as relative to this file descriptor. This might be improved once casper add supports for filesystem. MFC after: 1 month Reviewed by: allanjude Differential Revision: https://reviews.freebsd.org/D7936
224 lines
5.4 KiB
C
224 lines
5.4 KiB
C
/*-
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* Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org>
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* 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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* in this position and unchanged.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/capsicum.h>
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#include <sys/types.h>
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#include <ctype.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 <limits.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 <stringlist.h>
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#include <termios.h>
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#include <unistd.h>
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#define C_OPTION 0x1
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static StringList *includes;
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static void
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usage(void)
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{
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fprintf(stderr, "usage: soelim [-Crtv] [-I dir] [files]\n");
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exit(EXIT_FAILURE);
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}
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static const char *
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relpath(const char *path)
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{
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while (*path == '/' && *path != '\0')
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path++;
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return (path);
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}
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static FILE *
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soelim_fopen(int rootfd, const char *name)
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{
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char path[PATH_MAX];
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size_t i;
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int fd;
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if (strcmp(name, "-") == 0)
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return (stdin);
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if ((fd = openat(rootfd, relpath(name), O_RDONLY)) != -1)
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return (fdopen(fd, "r"));
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if (*name == '/') {
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warn("can't open '%s'", name);
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return (NULL);
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}
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for (i = 0; i < includes->sl_cur; i++) {
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snprintf(path, sizeof(path), "%s/%s", includes->sl_str[i],
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name);
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if ((fd = openat(rootfd, relpath(path), O_RDONLY)) != -1)
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return (fdopen(fd, "r"));
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}
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warn("can't open '%s'", name);
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return (NULL);
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}
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static int
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soelim_file(int rootfd, FILE *f, int flag)
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{
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char *line = NULL;
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char *walk, *cp;
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size_t linecap = 0;
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ssize_t linelen;
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if (f == NULL)
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return (1);
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while ((linelen = getline(&line, &linecap, f)) > 0) {
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if (strncmp(line, ".so", 3) != 0) {
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printf("%s", line);
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continue;
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}
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walk = line + 3;
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if (!isspace(*walk) && ((flag & C_OPTION) == 0)) {
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printf("%s", line);
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continue;
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}
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while (isspace(*walk))
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walk++;
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cp = walk;
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while (*cp != '\0' && !isspace(*cp))
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cp++;
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*cp = 0;
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if (cp < line + linelen)
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cp++;
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if (*walk == '\0') {
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printf("%s", line);
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continue;
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}
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if (soelim_file(rootfd, soelim_fopen(rootfd, walk), flag) == 1) {
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free(line);
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return (1);
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}
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if (*cp != '\0')
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printf("%s", cp);
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}
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free(line);
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fclose(f);
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return (0);
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}
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int
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main(int argc, char **argv)
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{
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int ch, i, rootfd;
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int ret = 0;
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int flags = 0;
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unsigned long cmd;
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char cwd[MAXPATHLEN];
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cap_rights_t rights;
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includes = sl_init();
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sl_add(includes, getcwd(cwd, sizeof(cwd)));
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if (includes == NULL)
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err(EXIT_FAILURE, "sl_init()");
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while ((ch = getopt(argc, argv, "CrtvI:")) != -1) {
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switch (ch) {
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case 'C':
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flags |= C_OPTION;
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break;
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case 'r':
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case 'v':
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case 't':
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/* stub compatibility with groff's soelim */
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break;
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case 'I':
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sl_add(includes, optarg);
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break;
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default:
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sl_free(includes, 0);
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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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cap_rights_init(&rights, CAP_READ, CAP_FSTAT, CAP_IOCTL);
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/*
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* EBADF in case stdin is closed by the caller
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*/
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if (cap_rights_limit(STDIN_FILENO, &rights) < 0 && errno != ENOSYS
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&& errno != EBADF)
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err(EXIT_FAILURE, "unable to limit rights for stdin");
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cap_rights_init(&rights, CAP_WRITE, CAP_FSTAT, CAP_IOCTL);
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if (cap_rights_limit(STDOUT_FILENO, &rights) < 0 && errno != ENOSYS)
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err(EXIT_FAILURE, "unable to limit rights for stdout");
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if (cap_rights_limit(STDERR_FILENO, &rights) < 0 && errno != ENOSYS)
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err(EXIT_FAILURE, "unable to limit rights for stderr");
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rootfd = open("/", O_DIRECTORY | O_RDONLY);
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cap_rights_init(&rights, CAP_READ, CAP_LOOKUP, CAP_FSTAT, CAP_FCNTL);
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if (cap_rights_limit(rootfd, &rights) < 0 && errno != ENOSYS)
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err(EXIT_FAILURE, "unable to limit rights");
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cmd = TIOCGETA;
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if (cap_ioctls_limit(STDOUT_FILENO, &cmd, 1) < 0 && errno != ENOSYS)
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err(EXIT_FAILURE, "unable to limit ioctls for stdout");
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if (cap_ioctls_limit(STDERR_FILENO, &cmd, 1) < 0 && errno != ENOSYS)
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err(EXIT_FAILURE, "unable to limit ioctls for stderr");
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if (cap_ioctls_limit(STDIN_FILENO, &cmd, 1) < 0 && errno != ENOSYS)
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err(EXIT_FAILURE, "unable to limit ioctls for stdin");
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if (cap_enter() < 0 && errno != ENOSYS)
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err(EXIT_FAILURE, "unable to enter capability mode");
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if (argc == 0)
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ret = soelim_file(rootfd, stdin, flags);
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for (i = 0; i < argc; i++)
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ret = soelim_file(rootfd, soelim_fopen(rootfd, argv[i]), flags);
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sl_free(includes, 0);
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close(rootfd);
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return (ret);
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}
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