diff options
Diffstat (limited to 'plugins/sudoers/toke_util.c')
| -rw-r--r-- | plugins/sudoers/toke_util.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/plugins/sudoers/toke_util.c b/plugins/sudoers/toke_util.c new file mode 100644 index 0000000..7db07f8 --- /dev/null +++ b/plugins/sudoers/toke_util.c @@ -0,0 +1,252 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 1996, 1998-2005, 2007-2016 + * Todd C. Miller <Todd.Miller@sudo.ws> + * + * 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. + * + * Sponsored in part by the Defense Advanced Research Projects + * Agency (DARPA) and Air Force Research Laboratory, Air Force + * Materiel Command, USAF, under agreement number F39502-99-1-0512. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <regex.h> + +#include <sudoers.h> +#include <toke.h> +#include <gram.h> + +static size_t arg_len = 0; +static size_t arg_size = 0; + +/* + * Copy the string and collapse any escaped characters. + * Requires that dst have at least len + 1 bytes free. + */ +static void +copy_string(char *dst, const char *src, size_t len) +{ + int h; + + while (len--) { + if (*src == '\\' && len) { + if (src[1] == 'x' && len >= 3 && (h = sudo_hexchar(src + 2)) != -1) { + *dst++ = (char)h; + src += 4; + len -= 3; + } else { + src++; + len--; + *dst++ = *src++; + } + } else { + *dst++ = *src++; + } + } + *dst = '\0'; +} + +bool +fill(const char *src, int ilen) +{ + const size_t len = (size_t)ilen; + char *dst; + debug_decl(fill, SUDOERS_DEBUG_PARSER); + + dst = malloc(len + 1); + if (dst == NULL) { + sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + sudoerserror(NULL); + debug_return_bool(false); + } + parser_leak_add(LEAK_PTR, dst); + copy_string(dst, src, len); + sudoerslval.string = dst; + + debug_return_bool(true); +} + +bool +append(const char *src, int ilen) +{ + const size_t len = (size_t)ilen; + size_t olen = 0; + char *dst; + debug_decl(append, SUDOERS_DEBUG_PARSER); + + if (sudoerslval.string != NULL) { + olen = strlen(sudoerslval.string); + parser_leak_remove(LEAK_PTR, sudoerslval.string); + } + + dst = realloc(sudoerslval.string, olen + len + 1); + if (dst == NULL) { + /* realloc failure, avoid leaking original */ + free(sudoerslval.string); + sudoerslval.string = NULL; + sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + sudoerserror(NULL); + debug_return_bool(false); + } + parser_leak_add(LEAK_PTR, dst); + copy_string(dst + olen, src, len); + sudoerslval.string = dst; + + debug_return_bool(true); +} + +#define SPECIAL(c) \ + ((c) == ',' || (c) == ':' || (c) == '=' || (c) == ' ' || (c) == '\t' || (c) == '#') + +bool +fill_cmnd(const char *src, int ilen) +{ + const size_t len = (size_t)ilen; + char *dst; + size_t i; + debug_decl(fill_cmnd, SUDOERS_DEBUG_PARSER); + + arg_len = arg_size = 0; + + dst = sudoerslval.command.cmnd = malloc(len + 1); + if (dst == NULL) { + sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + sudoerserror(NULL); + debug_return_bool(false); + } + sudoerslval.command.args = NULL; + + if (src[0] == '^') { + /* Copy the regular expression, no escaped sudo-specific characters. */ + memcpy(dst, src, len); + dst[len] = '\0'; + } else { + /* Copy the string and collapse any escaped sudo-specific characters. */ + for (i = 0; i < len; i++) { + if (src[i] == '\\' && i != len - 1 && SPECIAL(src[i + 1])) + *dst++ = src[++i]; + else + *dst++ = src[i]; + } + *dst = '\0'; + + /* Check for sudoedit specified as a fully-qualified path. */ + if ((dst = strrchr(sudoerslval.command.cmnd, '/')) != NULL) { // -V575 + if (strcmp(dst, "/sudoedit") == 0) { + if (sudoers_strict()) { + sudoerserror( + N_("sudoedit should not be specified with a path")); + } + free(sudoerslval.command.cmnd); + if ((sudoerslval.command.cmnd = strdup("sudoedit")) == NULL) { + sudo_warnx(U_("%s: %s"), __func__, + U_("unable to allocate memory")); + debug_return_bool(false); + } + } + } + } + + parser_leak_add(LEAK_PTR, sudoerslval.command.cmnd); + debug_return_bool(true); +} + +bool +fill_args(const char *s, int ilen, bool addspace) +{ + size_t len = (size_t)ilen; + size_t new_len; + char *p; + debug_decl(fill_args, SUDOERS_DEBUG_PARSER); + + if (arg_size == 0) { +#ifdef NO_LEAKS + if (sudoerslval.command.args != NULL) { + sudo_warnx("%s: command.args %p, should be NULL", __func__, + sudoerslval.command.args); + sudoerslval.command.args = NULL; + } +#endif + addspace = 0; + new_len = len; + } else { + new_len = arg_len + len + addspace; + } + + if (new_len >= arg_size) { + /* Allocate in increments of 128 bytes to avoid excessive realloc(). */ + arg_size = (new_len + 1 + 127) & ~127U; + + parser_leak_remove(LEAK_PTR, sudoerslval.command.args); + p = realloc(sudoerslval.command.args, arg_size); + if (p == NULL) { + sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); + goto bad; + } + parser_leak_add(LEAK_PTR, p); + sudoerslval.command.args = p; + } + + /* Efficiently append the arg (with a leading space if needed). */ + p = sudoerslval.command.args + arg_len; + if (addspace) + *p++ = ' '; + len = arg_size - (size_t)(p - sudoerslval.command.args); + if (strlcpy(p, s, len) >= len) { + sudo_warnx(U_("internal error, %s overflow"), __func__); + parser_leak_remove(LEAK_PTR, sudoerslval.command.args); + goto bad; + } + arg_len = new_len; + debug_return_bool(true); +bad: + sudoerserror(NULL); + free(sudoerslval.command.args); + sudoerslval.command.args = NULL; + arg_len = arg_size = 0; + debug_return_bool(false); +} + +/* + * Check to make sure an IPv6 address does not contain multiple instances + * of the string "::". Assumes strlen(s) >= 1. + * Returns true if address is valid else false. + */ +bool +ipv6_valid(const char *s) +{ + int nmatch = 0; + debug_decl(ipv6_valid, SUDOERS_DEBUG_PARSER); + + for (; *s != '\0'; s++) { + if (s[0] == ':' && s[1] == ':') { + if (++nmatch > 1) + break; + } + if (s[0] == '/') + nmatch = 0; /* reset if we hit netmask */ + } + + debug_return_bool(nmatch <= 1); +} |