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/*
* Copyright (c) 2021-2022 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.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include <netdb.h>
#include <regex.h>
#include <time.h>
#include <unistd.h>
#if defined(HAVE_STDINT_H)
# include <stdint.h>
#elif defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#endif
#include "sudo_compat.h"
#include "sudo_conf.h"
#include "sudo_debug.h"
#include "sudo_eventlog.h"
#include "sudo_fatal.h"
#include "sudo_iolog.h"
#include "sudo_plugin.h"
#include "sudo_util.h"
#include "logsrvd.h"
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
/*
* Stub version that always succeeds for small inputs and fails for large.
* We want to fuzz our parser, not libc's regular expression code.
*/
bool
sudo_regex_compile_v1(void *v, const char *pattern, const char **errstr)
{
regex_t *preg = v;
if (strlen(pattern) > 32) {
*errstr = "invalid regular expression";
return false;
}
/* hopefully avoid regfree() crashes */
memset(preg, 0, sizeof(*preg));
return true;
}
/*
* The fuzzing environment may not have DNS available, this may result
* in long delays that cause a timeout when fuzzing.
* This getaddrinfo() resolves every name as "localhost" (127.0.0.1).
*/
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
/* Avoid compilation errors if getaddrinfo() or freeaddrinfo() are macros. */
# undef getaddrinfo
# undef freeaddrinfo
int
# ifdef HAVE_GETADDRINFO
getaddrinfo(
# else
sudo_getaddrinfo(
# endif
const char *nodename, const char *servname,
const struct addrinfo *hints, struct addrinfo **res)
{
struct addrinfo *ai;
struct in_addr addr;
unsigned short port = 0;
/* Stub getaddrinfo(3) to avoid a DNS timeout in CIfuzz. */
if (servname == NULL) {
/* Must have either nodename or servname. */
if (nodename == NULL)
return EAI_NONAME;
} else {
struct servent *servent;
const char *errstr;
/* Parse servname as a port number or IPv4 TCP service name. */
port = sudo_strtonum(servname, 0, USHRT_MAX, &errstr);
if (errstr != NULL && errno == ERANGE)
return EAI_SERVICE;
if (hints != NULL && ISSET(hints->ai_flags, AI_NUMERICSERV))
return EAI_NONAME;
servent = getservbyname(servname, "tcp");
if (servent == NULL)
return EAI_NONAME;
port = htons(servent->s_port);
}
/* Hard-code IPv4 localhost for fuzzing. */
ai = calloc(1, sizeof(*ai) + sizeof(struct sockaddr_in));
if (ai == NULL)
return EAI_MEMORY;
ai->ai_canonname = strdup("localhost");
if (ai == NULL) {
free(ai);
return EAI_MEMORY;
}
ai->ai_family = AF_INET;
ai->ai_protocol = IPPROTO_TCP;
ai->ai_addrlen = sizeof(struct sockaddr_in);
ai->ai_addr = (struct sockaddr *)(ai + 1);
inet_pton(AF_INET, "127.0.0.1", &addr);
((struct sockaddr_in *)ai->ai_addr)->sin_family = AF_INET;
((struct sockaddr_in *)ai->ai_addr)->sin_addr = addr;
((struct sockaddr_in *)ai->ai_addr)->sin_port = htons(port);
*res = ai;
return 0;
}
void
# ifdef HAVE_GETADDRINFO
freeaddrinfo(struct addrinfo *ai)
# else
sudo_freeaddrinfo(struct addrinfo *ai)
# endif
{
struct addrinfo *next;
while (ai != NULL) {
next = ai->ai_next;
free(ai->ai_canonname);
free(ai);
ai = next;
}
}
#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
static int
fuzz_conversation(int num_msgs, const struct sudo_conv_message msgs[],
struct sudo_conv_reply replies[], struct sudo_conv_callback *callback)
{
int n;
for (n = 0; n < num_msgs; n++) {
const struct sudo_conv_message *msg = &msgs[n];
switch (msg->msg_type & 0xff) {
case SUDO_CONV_PROMPT_ECHO_ON:
case SUDO_CONV_PROMPT_MASK:
case SUDO_CONV_PROMPT_ECHO_OFF:
/* input not supported */
return -1;
case SUDO_CONV_ERROR_MSG:
case SUDO_CONV_INFO_MSG:
/* no output for fuzzers */
break;
default:
return -1;
}
}
return 0;
}
int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
char tempfile[] = "/tmp/logsrvd_conf.XXXXXX";
size_t nwritten;
int fd;
initprogname("fuzz_logsrvd_conf");
if (getenv("SUDO_FUZZ_VERBOSE") == NULL)
sudo_warn_set_conversation(fuzz_conversation);
/* logsrvd_conf_read() uses a conf file path, not an open file. */
fd = mkstemp(tempfile);
if (fd == -1)
return 0;
nwritten = write(fd, data, size);
if (nwritten != size) {
close(fd);
return 0;
}
close(fd);
if (logsrvd_conf_read(tempfile)) {
/* public config getters */
logsrvd_conf_iolog_dir();
logsrvd_conf_iolog_file();
logsrvd_conf_iolog_mode();
logsrvd_conf_pid_file();
logsrvd_conf_relay_address();
logsrvd_conf_relay_connect_timeout();
logsrvd_conf_relay_tcp_keepalive();
logsrvd_conf_relay_timeout();
logsrvd_conf_server_listen_address();
logsrvd_conf_server_tcp_keepalive();
logsrvd_conf_server_timeout();
/* free config */
logsrvd_conf_cleanup();
}
unlink(tempfile);
fflush(stdout);
return 0;
}
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