diff options
Diffstat (limited to 'logsrvd/regress/fuzz')
| -rw-r--r-- | logsrvd/regress/fuzz/fuzz_logsrvd_conf.c | 225 | ||||
| -rw-r--r-- | logsrvd/regress/fuzz/fuzz_logsrvd_conf.dict | 44 |
2 files changed, 269 insertions, 0 deletions
diff --git a/logsrvd/regress/fuzz/fuzz_logsrvd_conf.c b/logsrvd/regress/fuzz/fuzz_logsrvd_conf.c new file mode 100644 index 0000000..dc012be --- /dev/null +++ b/logsrvd/regress/fuzz/fuzz_logsrvd_conf.c @@ -0,0 +1,225 @@ +/* + * 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"; + ssize_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 == -1) { + 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; +} diff --git a/logsrvd/regress/fuzz/fuzz_logsrvd_conf.dict b/logsrvd/regress/fuzz/fuzz_logsrvd_conf.dict new file mode 100644 index 0000000..d9f5d10 --- /dev/null +++ b/logsrvd/regress/fuzz/fuzz_logsrvd_conf.dict @@ -0,0 +1,44 @@ +"[server]" +"listen_address" +"pid_file" +"tcp_keepalive" +"timeout" +"tls_verify" +"tls_checkpeer" +"tls_cacert" +"tls_cert" +"tls_key" +"tls_ciphers_v12" +"tls_ciphers_v13" +"tls_dhparams" + +"[relay]" +"relay_host" +"connect_timeout" + +"[iolog]" +"iolog_dir" +"iolog_file" +"iolog_compress" +"iolog_flush" +"iolog_group" +"iolog_user" +"iolog_mode" +"log_passwords" +"maxseq" +"passprompt_regex" + +"[eventlog]" +"log_type" +"log_format" + +"[syslog]" +"maxlen" +"facility" +"accept_priority" +"reject_priority" +"alert_priority" + +"[logfile]" +"path" +"time_format" |