mirror of https://github.com/sudo-project/sudo.git
120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
/*
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* Copyright (c) 2021 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#if defined(HAVE_STDINT_H)
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# include <stdint.h>
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#elif defined(HAVE_INTTYPES_H)
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# include <inttypes.h>
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#endif
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#include <sudo_compat.h>
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#include <sudo_debug.h>
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#include <sudo_eventlog.h>
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#include <sudo_fatal.h>
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#include <sudo_iolog.h>
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#include <sudo_plugin.h>
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#include <sudo_util.h>
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
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static FILE *
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open_data(const uint8_t *data, size_t size)
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{
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#ifdef HAVE_FMEMOPEN
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/* Operate in-memory. */
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return fmemopen((void *)data, size, "r");
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#else
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char tempfile[] = "/tmp/legacy.XXXXXX";
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size_t nwritten;
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int fd;
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/* Use (unlinked) temporary file. */
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fd = mkstemp(tempfile);
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if (fd == -1)
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return NULL;
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unlink(tempfile);
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nwritten = write(fd, data, size);
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if (nwritten != size) {
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close(fd);
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return NULL;
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}
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lseek(fd, 0, SEEK_SET);
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return fdopen(fd, "r");
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#endif
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}
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static int
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fuzz_conversation(int num_msgs, const struct sudo_conv_message msgs[],
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struct sudo_conv_reply replies[], struct sudo_conv_callback *callback)
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{
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int n;
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for (n = 0; n < num_msgs; n++) {
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const struct sudo_conv_message *msg = &msgs[n];
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switch (msg->msg_type & 0xff) {
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case SUDO_CONV_PROMPT_ECHO_ON:
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case SUDO_CONV_PROMPT_MASK:
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case SUDO_CONV_PROMPT_ECHO_OFF:
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/* input not supported */
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return -1;
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case SUDO_CONV_ERROR_MSG:
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case SUDO_CONV_INFO_MSG:
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/* no output for fuzzers */
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break;
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default:
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return -1;
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}
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}
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return 0;
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}
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int
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LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
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{
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struct eventlog *evlog = NULL;
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FILE *fp;
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initprogname("fuzz_iolog_legacy");
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if (getenv("SUDO_FUZZ_VERBOSE") == NULL)
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sudo_warn_set_conversation(fuzz_conversation);
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fp = open_data(data, size);
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if (fp == NULL)
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return 0;
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/* Parsed contents of an I/O log info file are stored in evlog. */
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evlog = calloc(1, sizeof(*evlog));
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if (evlog != NULL) {
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evlog->runuid = (uid_t)-1;
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evlog->rungid = (gid_t)-1;
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/* Try to parse buffer as a legacy-format I/O log info file. */
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iolog_parse_loginfo_legacy(fp, "fuzz.legacy", evlog);
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eventlog_free(evlog);
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}
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fclose(fp);
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fflush(stdout);
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return 0;
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}
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