diff options
Diffstat (limited to 'crypto/krb5/src/tests/fuzzing/fuzz_krb.c')
| -rw-r--r-- | crypto/krb5/src/tests/fuzzing/fuzz_krb.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/crypto/krb5/src/tests/fuzzing/fuzz_krb.c b/crypto/krb5/src/tests/fuzzing/fuzz_krb.c new file mode 100644 index 000000000000..61f16765db58 --- /dev/null +++ b/crypto/krb5/src/tests/fuzzing/fuzz_krb.c @@ -0,0 +1,170 @@ +/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ +/* tests/fuzzing/krb.c - fuzzing harness for miscellaneous libkrb5 functions */ +/* + * Copyright (C) 2024 by Arjun. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "autoconf.h" +#include <k5-int.h> + +#define kMinInputLength 2 +#define kMaxInputLength 512 + +#define ANAME_SZ 40 +#define INST_SZ 40 +#define REALM_SZ 40 + +extern int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size); + +static void +fuzz_deltat(char *data_in) +{ + krb5_deltat result; + krb5_string_to_deltat(data_in, &result); +} + +static void +fuzz_host_string(char *data_in) +{ + krb5_error_code ret; + char *host; + int port = -1; + + ret = k5_parse_host_string(data_in, 0, &host, &port); + if (!ret) + free(host); +} + +static void +fuzz_princ(krb5_context context, char *data_in) +{ + krb5_error_code ret; + krb5_principal p; + char *princ; + + ret = krb5_parse_name(context, data_in, &p); + if (ret) + return; + + ret = krb5_unparse_name(context, p, &princ); + if (!ret) + free(princ); + + krb5_free_principal(context, p); +} + +static void +fuzz_principal_425(krb5_context context, char *data_in) +{ + krb5_principal princ; + krb5_425_conv_principal(context, data_in, data_in, data_in, &princ); + krb5_free_principal(context, princ); +} + +static void +fuzz_principal_524(krb5_context context, char *data_in) +{ + krb5_error_code ret; + krb5_principal princ = 0; + char aname[ANAME_SZ + 1], inst[INST_SZ + 1], realm[REALM_SZ + 1]; + + aname[ANAME_SZ] = inst[INST_SZ] = realm[REALM_SZ] = 0; + + ret = krb5_parse_name(context, data_in, &princ); + if (ret) + return; + + krb5_524_conv_principal(context, princ, aname, inst, realm); + krb5_free_principal(context, princ); +} + +static void +fuzz_timestamp(char *data_in) +{ + krb5_error_code ret; + krb5_timestamp timestamp; + + ret = krb5_string_to_timestamp(data_in, ×tamp); + if (!ret) + ts2tt(timestamp); +} + +/* + * data_in is going to be modified during parsing. + */ +static void +fuzz_enctype_list(char *data_in) +{ + krb5_error_code ret; + krb5_context context; + krb5_enctype *ienc, zero = 0; + + ret = krb5_init_context(&context); + if (ret) + return; + + ret = krb5int_parse_enctype_list(context, "", data_in, &zero, &ienc); + if (!ret) + free(ienc); + + krb5_free_context(context); +} + +extern int +LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) +{ + krb5_error_code ret; + krb5_context context = NULL; + char *data_in; + + if (size < kMinInputLength || size > kMaxInputLength) + return 0; + + ret = krb5_init_context(&context); + if (ret) + return 0; + + data_in = k5memdup0(data, size, &ret); + if (ret) + goto cleanup; + + fuzz_deltat(data_in); + fuzz_host_string(data_in); + fuzz_princ(context, data_in); + fuzz_principal_425(context, data_in); + fuzz_principal_524(context, data_in); + fuzz_timestamp(data_in); + fuzz_enctype_list(data_in); + + free(data_in); + +cleanup: + krb5_free_context(context); + + return 0; +} |