/* ====================================================================

 * Copyright (c) 2003 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer. 

 *

 * 2. 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.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    openssl-core@openssl.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 *

 */

#define _GNU_SOURCE

#include <openssl/rand.h>

#include <openssl/fips_rand.h>

#include <openssl/err.h>

#include <openssl/bio.h>

#include <openssl/hmac.h>

#include <openssl/rsa.h>

#include <string.h>

#include <limits.h>

#include <dlfcn.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include "fips_locl.h"

#ifdef OPENSSL_FIPS

# include <openssl/fips.h>

# include "internal/thread_once.h"

# include "crypto/rand.h"

# ifndef PATH_MAX

#  define PATH_MAX 1024

# endif

static int fips_selftest_fail = 0;

static int fips_mode = 0;

static int fips_started = 0;

static int fips_post = 0;

static int fips_is_owning_thread(void);

static int fips_set_owning_thread(void);

static int fips_clear_owning_thread(void);

static CRYPTO_RWLOCK *fips_lock = NULL;

static CRYPTO_RWLOCK *fips_owning_lock = NULL;

static CRYPTO_ONCE fips_lock_init = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(do_fips_lock_init)

{

    fips_lock = CRYPTO_THREAD_lock_new();

    fips_owning_lock = CRYPTO_THREAD_lock_new();

    return fips_lock != NULL && fips_owning_lock != NULL;

}

# define fips_w_lock()   CRYPTO_THREAD_write_lock(fips_lock)

# define fips_w_unlock() CRYPTO_THREAD_unlock(fips_lock)

# define fips_r_lock()   CRYPTO_THREAD_read_lock(fips_lock)

# define fips_r_unlock() CRYPTO_THREAD_unlock(fips_lock)

static void fips_set_mode(int onoff)

{

    int owning_thread = fips_is_owning_thread();

    if (fips_started) {

        if (!owning_thread)

            fips_w_lock();

        fips_mode = onoff;

        if (!owning_thread)

            fips_w_unlock();

    }

}

int FIPS_module_mode(void)

{

    int ret = 0;

    int owning_thread = fips_is_owning_thread();

    if (fips_started) {

        if (!owning_thread)

            fips_r_lock();

        ret = fips_mode;

        if (!owning_thread)

            fips_r_unlock();

    }

    return ret;

}

/* just a compat symbol - return NULL */

int FIPS_selftest_failed(void)

{

    int ret = 0;

    if (fips_started) {

        int owning_thread = fips_is_owning_thread();

        if (!owning_thread)

            fips_r_lock();

        ret = fips_selftest_fail;

        if (!owning_thread)

            fips_r_unlock();

    }

    return ret;

}

/* Selftest failure fatal exit routine. This will be called

 * during *any* cryptographic operation. It has the minimum

 * overhead possible to avoid too big a performance hit.

 */

void FIPS_selftest_check(void)

{

    if (fips_selftest_fail) {

        OpenSSLDie(__FILE__, __LINE__, "FATAL FIPS SELFTEST FAILURE");

    }

}

void fips_set_selftest_fail(void)

{

    fips_selftest_fail = 1;

}

int fips_in_post(void)

{

    return fips_post;

}

/* we implement what libfipscheck does ourselves */

static int

get_library_path(const char *libname, const char *symbolname, char *path,

                 size_t pathlen)

{

    Dl_info info;

    void *dl, *sym;

    int rv = -1;

    dl = dlopen(libname, RTLD_LAZY);

    if (dl == NULL) {

        return -1;

    }

    sym = dlsym(dl, symbolname);

    if (sym != NULL && dladdr(sym, &info)) {

        strncpy(path, info.dli_fname, pathlen - 1);

        path[pathlen - 1] = '\0';

        rv = 0;

    }

    dlclose(dl);

    return rv;

}

static const char conv[] = "0123456789abcdef";

static char *bin2hex(void *buf, size_t len)

{

    char *hex, *p;

    unsigned char *src = buf;

    hex = malloc(len * 2 + 1);

    if (hex == NULL)

        return NULL;

    p = hex;

    while (len > 0) {

        unsigned c;

        c = *src;

        src++;

        *p = conv[c >> 4];

        ++p;

        *p = conv[c & 0x0f];

        ++p;

        --len;

    }

    *p = '\0';

    return hex;

}

# define HMAC_PREFIX "."

# ifndef HMAC_SUFFIX

#  define HMAC_SUFFIX ".hmac"

# endif

# define READ_BUFFER_LENGTH 16384

static char *make_hmac_path(const char *origpath)

{

    char *path, *p;

    const char *fn;

    path =

        malloc(sizeof(HMAC_PREFIX) + sizeof(HMAC_SUFFIX) + strlen(origpath));

    if (path == NULL) {

        return NULL;

    }

    fn = strrchr(origpath, '/');

    if (fn == NULL) {

        fn = origpath;

    } else {

        ++fn;

    }

    strncpy(path, origpath, fn - origpath);

    p = path + (fn - origpath);

    p = stpcpy(p, HMAC_PREFIX);

    p = stpcpy(p, fn);

    p = stpcpy(p, HMAC_SUFFIX);

    return path;

}

static const char hmackey[] = "orboDeJITITejsirpADONivirpUkvarP";

static int compute_file_hmac(const char *path, void **buf, size_t *hmaclen)

{

    FILE *f = NULL;

    int rv = -1;

    unsigned char rbuf[READ_BUFFER_LENGTH];

    size_t len;

    unsigned int hlen;

    HMAC_CTX *c;

    c = HMAC_CTX_new();

    if (c == NULL)

        return rv;

    f = fopen(path, "r");

    if (f == NULL) {

        goto end;

    }

    if (HMAC_Init_ex(c, hmackey, sizeof(hmackey) - 1, EVP_sha256(), NULL) <= 0) {

        goto end;

    }

    while ((len = fread(rbuf, 1, sizeof(rbuf), f)) != 0) {

        if (HMAC_Update(c, rbuf, len) <= 0) {

            goto end;

        }

    }

    len = sizeof(rbuf);

    /* reuse rbuf for hmac */

    if (HMAC_Final(c, rbuf, &hlen) <= 0) {

        goto end;

    }

    *buf = malloc(hlen);

    if (*buf == NULL) {

        goto end;

    }

    *hmaclen = hlen;

    memcpy(*buf, rbuf, hlen);

    rv = 0;

 end:

    HMAC_CTX_free(c);

    if (f)

        fclose(f);

    return rv;

}

static int FIPSCHECK_verify(const char *path)

{

    int rv = 0;

    FILE *hf;

    char *hmacpath, *p;

    char *hmac = NULL;

    size_t n;

    hmacpath = make_hmac_path(path);

    if (hmacpath == NULL)

        return 0;

    hf = fopen(hmacpath, "r");

    if (hf == NULL) {

        free(hmacpath);

        return 0;

    }

    if (getline(&hmac, &n, hf) > 0) {

        void *buf;

        size_t hmaclen;

        char *hex;

        if ((p = strchr(hmac, '\n')) != NULL)

            *p = '\0';

        if (compute_file_hmac(path, &buf, &hmaclen) < 0) {

            rv = -4;

            goto end;

        }

        if ((hex = bin2hex(buf, hmaclen)) == NULL) {

            free(buf);

            rv = -5;

            goto end;

        }

        if (strcmp(hex, hmac) != 0) {

            rv = -1;

        }

        free(buf);

        free(hex);

    } else {

        rv = -1;

    }

 end:

    free(hmac);

    free(hmacpath);

    fclose(hf);

    if (rv < 0)

        return 0;

    /* check successful */

    return 1;

}

static int verify_checksums(void)

{

    int rv;

    char path[PATH_MAX + 1];

    char *p;

    /* we need to avoid dlopening libssl, assume both libcrypto and libssl

       are in the same directory */

    rv = get_library_path("libcrypto.so." SHLIB_VERSION_NUMBER,

                          "FIPS_mode_set", path, sizeof(path));

    if (rv < 0)

        return 0;

    rv = FIPSCHECK_verify(path);

    if (!rv)

        return 0;

    /* replace libcrypto with libssl */

    while ((p = strstr(path, "libcrypto.so")) != NULL) {

        p = stpcpy(p, "libssl");

        memmove(p, p + 3, strlen(p + 2));

    }

    rv = FIPSCHECK_verify(path);

    if (!rv)

        return 0;

    return 1;

}

# ifndef FIPS_MODULE_PATH

#  define FIPS_MODULE_PATH "/etc/system-fips"

# endif

int FIPS_module_installed(void)

{

    int rv;

    rv = access(FIPS_MODULE_PATH, F_OK);

    if (rv < 0 && errno != ENOENT)

        rv = 0;

    /* Installed == true */

    return !rv || FIPS_module_mode();

}

int FIPS_module_mode_set(int onoff)

{

    int ret = 0;

    if (!RUN_ONCE(&fips_lock_init, do_fips_lock_init))

        return 0;

    fips_w_lock();

    fips_started = 1;

    fips_set_owning_thread();

    if (onoff) {

        fips_selftest_fail = 0;

        /* Don't go into FIPS mode twice, just so we can do automagic

           seeding */

        if (FIPS_module_mode()) {

            FIPSerr(FIPS_F_FIPS_MODULE_MODE_SET,

                    FIPS_R_FIPS_MODE_ALREADY_SET);

            fips_selftest_fail = 1;

            ret = 0;

            goto end;

        }

# ifdef OPENSSL_IA32_SSE2

        {

            extern unsigned int OPENSSL_ia32cap_P[2];

            if ((OPENSSL_ia32cap_P[0] & (1 << 25 | 1 << 26)) !=

                (1 << 25 | 1 << 26)) {

                FIPSerr(FIPS_F_FIPS_MODULE_MODE_SET,

                        FIPS_R_UNSUPPORTED_PLATFORM);

                fips_selftest_fail = 1;

                ret = 0;

                goto end;

            }

        }

# endif

        fips_post = 1;

        if (!FIPS_selftest()) {

            fips_selftest_fail = 1;

            ret = 0;

            goto end;

        }

        if (!verify_checksums()) {

            FIPSerr(FIPS_F_FIPS_MODULE_MODE_SET,

                    FIPS_R_FINGERPRINT_DOES_NOT_MATCH);

            fips_selftest_fail = 1;

            ret = 0;

            goto end;

        }

        fips_post = 0;

        fips_set_mode(onoff);

        /* force RNG reseed with entropy from getrandom() on next call */

        rand_force_reseed();

        ret = 1;

        goto end;

    }

    fips_set_mode(0);

    fips_selftest_fail = 0;

    ret = 1;

 end:

    fips_clear_owning_thread();

    fips_w_unlock();

    return ret;

}

static CRYPTO_THREAD_ID fips_threadid;

static int fips_thread_set = 0;

static int fips_is_owning_thread(void)

{

    int ret = 0;

    if (fips_started) {

        CRYPTO_THREAD_read_lock(fips_owning_lock);

        if (fips_thread_set) {

            CRYPTO_THREAD_ID cur = CRYPTO_THREAD_get_current_id();

            if (CRYPTO_THREAD_compare_id(fips_threadid, cur))

                ret = 1;

        }

        CRYPTO_THREAD_unlock(fips_owning_lock);

    }

    return ret;

}

int fips_set_owning_thread(void)

{

    int ret = 0;

    if (fips_started) {

        CRYPTO_THREAD_write_lock(fips_owning_lock);

        if (!fips_thread_set) {

            fips_threadid = CRYPTO_THREAD_get_current_id();

            ret = 1;

            fips_thread_set = 1;

        }

        CRYPTO_THREAD_unlock(fips_owning_lock);

    }

    return ret;

}

int fips_clear_owning_thread(void)

{

    int ret = 0;

    if (fips_started) {

        CRYPTO_THREAD_write_lock(fips_owning_lock);

        if (fips_thread_set) {

            CRYPTO_THREAD_ID cur = CRYPTO_THREAD_get_current_id();

            if (CRYPTO_THREAD_compare_id(fips_threadid, cur))

                fips_thread_set = 0;

        }

        CRYPTO_THREAD_unlock(fips_owning_lock);

    }

    return ret;

}

#endif