diff options
author | Matt Caswell <matt@openssl.org> | 2019-05-23 14:35:31 +0100 |
---|---|---|
committer | Matt Caswell <matt@openssl.org> | 2019-06-07 12:04:34 +0100 |
commit | da0d114cd962e89b2614f4707902c404acab7ebd (patch) | |
tree | 2114eff6bb5c75d8f83ed33b499efbde92bdb541 /crypto/rand/drbg_lib.c | |
parent | bab6046146c4fc8f088c1aaca11598ede7609c04 (diff) |
Convert drbg_lib to use OPENSSL_CTX for its global data
In preparation for moving the RAND code into the FIPS module we make
drbg_lib.c OPENSSL_CTX aware.
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9039)
Diffstat (limited to 'crypto/rand/drbg_lib.c')
-rw-r--r-- | crypto/rand/drbg_lib.c | 228 |
1 files changed, 137 insertions, 91 deletions
diff --git a/crypto/rand/drbg_lib.c b/crypto/rand/drbg_lib.c index fbe75e66cb..eece882916 100644 --- a/crypto/rand/drbg_lib.c +++ b/crypto/rand/drbg_lib.c @@ -29,49 +29,49 @@ * a much bigger deal than just re-setting an allocated resource.) */ -/* - * The three shared DRBG instances - * - * There are three shared DRBG instances: <master>, <public>, and <private>. - */ - -/* - * The <master> DRBG - * - * Not used directly by the application, only for reseeding the two other - * DRBGs. It reseeds itself by pulling either randomness from os entropy - * sources or by consuming randomness which was added by RAND_add(). - * - * The <master> DRBG is a global instance which is accessed concurrently by - * all threads. The necessary locking is managed automatically by its child - * DRBG instances during reseeding. - */ -static RAND_DRBG *master_drbg; -/* - * The <public> DRBG - * - * Used by default for generating random bytes using RAND_bytes(). - * - * The <public> DRBG is thread-local, i.e., there is one instance per thread. - */ -static CRYPTO_THREAD_LOCAL public_drbg; -/* - * The <private> DRBG - * - * Used by default for generating private keys using RAND_priv_bytes() - * - * The <private> DRBG is thread-local, i.e., there is one instance per thread. - */ -static CRYPTO_THREAD_LOCAL private_drbg; +typedef struct drbg_global_st { + /* + * The three shared DRBG instances + * + * There are three shared DRBG instances: <master>, <public>, and <private>. + */ + /* + * The <master> DRBG + * + * Not used directly by the application, only for reseeding the two other + * DRBGs. It reseeds itself by pulling either randomness from os entropy + * sources or by consuming randomness which was added by RAND_add(). + * + * The <master> DRBG is a global instance which is accessed concurrently by + * all threads. The necessary locking is managed automatically by its child + * DRBG instances during reseeding. + */ + RAND_DRBG *master_drbg; + /* + * The <public> DRBG + * + * Used by default for generating random bytes using RAND_bytes(). + * + * The <public> DRBG is thread-local, i.e., there is one instance per + * thread. + */ + CRYPTO_THREAD_LOCAL public_drbg; + /* + * The <private> DRBG + * + * Used by default for generating private keys using RAND_priv_bytes() + * + * The <private> DRBG is thread-local, i.e., there is one instance per + * thread. + */ + CRYPTO_THREAD_LOCAL private_drbg; +} DRBG_GLOBAL; /* NIST SP 800-90A DRBG recommends the use of a personalization string. */ static const char ossl_pers_string[] = DRBG_DEFAULT_PERS_STRING; -static CRYPTO_ONCE rand_drbg_init = CRYPTO_ONCE_STATIC_INIT; - - #define RAND_DRBG_TYPE_FLAGS ( \ RAND_DRBG_FLAG_MASTER | RAND_DRBG_FLAG_PUBLIC | RAND_DRBG_FLAG_PRIVATE ) @@ -102,9 +102,10 @@ static const unsigned int rand_drbg_used_flags = RAND_DRBG_FLAG_CTR_NO_DF | RAND_DRBG_FLAG_HMAC | RAND_DRBG_TYPE_FLAGS; -static RAND_DRBG *drbg_setup(RAND_DRBG *parent, int drbg_type); +static RAND_DRBG *drbg_setup(OPENSSL_CTX *ctx, RAND_DRBG *parent, int drbg_type); -static RAND_DRBG *rand_drbg_new(int secure, +static RAND_DRBG *rand_drbg_new(OPENSSL_CTX *ctx, + int secure, int type, unsigned int flags, RAND_DRBG *parent); @@ -236,7 +237,8 @@ int RAND_DRBG_set_defaults(int type, unsigned int flags) * * Returns a pointer to the new DRBG instance on success, NULL on failure. */ -static RAND_DRBG *rand_drbg_new(int secure, +static RAND_DRBG *rand_drbg_new(OPENSSL_CTX *ctx, + int secure, int type, unsigned int flags, RAND_DRBG *parent) @@ -249,6 +251,7 @@ static RAND_DRBG *rand_drbg_new(int secure, return NULL; } + drbg->libctx = ctx; drbg->secure = secure && CRYPTO_secure_allocated(drbg); drbg->fork_count = rand_fork_count; drbg->parent = parent; @@ -305,16 +308,27 @@ static RAND_DRBG *rand_drbg_new(int secure, return NULL; } +RAND_DRBG *RAND_DRBG_new_ex(OPENSSL_CTX *ctx, int type, unsigned int flags, + RAND_DRBG *parent) +{ + return rand_drbg_new(ctx, 0, type, flags, parent); +} + RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent) { - return rand_drbg_new(0, type, flags, parent); + return RAND_DRBG_new_ex(NULL, type, flags, parent); } -RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent) +RAND_DRBG *RAND_DRBG_secure_new_ex(OPENSSL_CTX *ctx, int type, + unsigned int flags, RAND_DRBG *parent) { - return rand_drbg_new(1, type, flags, parent); + return rand_drbg_new(ctx, 1, type, flags, parent); } +RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent) +{ + return RAND_DRBG_secure_new_ex(NULL, type, flags, parent); +} /* * Uninstantiate |drbg| and free all memory. */ @@ -943,12 +957,12 @@ void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx) * * Returns a pointer to the new DRBG instance on success, NULL on failure. */ -static RAND_DRBG *drbg_setup(RAND_DRBG *parent, int drbg_type) +static RAND_DRBG *drbg_setup(OPENSSL_CTX *ctx, RAND_DRBG *parent, int drbg_type) { RAND_DRBG *drbg; - drbg = RAND_DRBG_secure_new(rand_drbg_type[drbg_type], - rand_drbg_flags[drbg_type], parent); + drbg = RAND_DRBG_secure_new_ex(ctx, rand_drbg_type[drbg_type], + rand_drbg_flags[drbg_type], parent); if (drbg == NULL) return NULL; @@ -976,59 +990,72 @@ err: } /* - * Initialize the global DRBGs on first use. - * Returns 1 on success, 0 on failure. + * Initialize the OPENSSL_CTX global DRBGs on first use. + * Returns the allocated global data on success or NULL on failure. */ -DEFINE_RUN_ONCE_STATIC(do_rand_drbg_init) +static void *drbg_ossl_ctx_new(OPENSSL_CTX *libctx) { - /* - * ensure that libcrypto is initialized, otherwise the - * DRBG locks are not cleaned up properly - */ - if (!OPENSSL_init_crypto(0, NULL)) - return 0; + DRBG_GLOBAL *dgbl = OPENSSL_zalloc(sizeof(*dgbl)); - if (!CRYPTO_THREAD_init_local(&private_drbg, NULL)) - return 0; + if (dgbl == NULL) + return NULL; - if (!CRYPTO_THREAD_init_local(&public_drbg, NULL)) + if (!CRYPTO_THREAD_init_local(&dgbl->private_drbg, NULL)) goto err1; - master_drbg = drbg_setup(NULL, RAND_DRBG_TYPE_MASTER); - if (master_drbg == NULL) + if (!CRYPTO_THREAD_init_local(&dgbl->public_drbg, NULL)) goto err2; - return 1; + dgbl->master_drbg = drbg_setup(libctx, NULL, RAND_DRBG_TYPE_MASTER); + if (dgbl->master_drbg == NULL) + goto err3; -err2: - CRYPTO_THREAD_cleanup_local(&public_drbg); -err1: - CRYPTO_THREAD_cleanup_local(&private_drbg); - return 0; + return dgbl; + + err3: + CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg); + err2: + CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg); + err1: + OPENSSL_free(dgbl); + return NULL; } -/* Clean up the global DRBGs before exit */ -void rand_drbg_cleanup_int(void) +static void drbg_ossl_ctx_free(void *vdgbl) { - if (master_drbg != NULL) { - RAND_DRBG_free(master_drbg); - master_drbg = NULL; + DRBG_GLOBAL *dgbl = vdgbl; - CRYPTO_THREAD_cleanup_local(&private_drbg); - CRYPTO_THREAD_cleanup_local(&public_drbg); - } + RAND_DRBG_free(dgbl->master_drbg); + CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg); + CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg); + + OPENSSL_free(dgbl); +} + +static const OPENSSL_CTX_METHOD drbg_ossl_ctx_method = { + drbg_ossl_ctx_new, + drbg_ossl_ctx_free, +}; + +static DRBG_GLOBAL *drbg_get_global(OPENSSL_CTX *libctx) +{ + return openssl_ctx_get_data(libctx, OPENSSL_CTX_DRBG_INDEX, + &drbg_ossl_ctx_method); } void drbg_delete_thread_state(void) { + DRBG_GLOBAL *dgbl = drbg_get_global(ctx); RAND_DRBG *drbg; - drbg = CRYPTO_THREAD_get_local(&public_drbg); - CRYPTO_THREAD_set_local(&public_drbg, NULL); + if (dgbl == NULL) + return; + drbg = CRYPTO_THREAD_get_local(&dgbl->public_drbg); + CRYPTO_THREAD_set_local(&dgbl->public_drbg, NULL); RAND_DRBG_free(drbg); - drbg = CRYPTO_THREAD_get_local(&private_drbg); - CRYPTO_THREAD_set_local(&private_drbg, NULL); + drbg = CRYPTO_THREAD_get_local(&dgbl->private_drbg); + CRYPTO_THREAD_set_local(&dgbl->private_drbg, NULL); RAND_DRBG_free(drbg); } @@ -1180,56 +1207,75 @@ static int drbg_status(void) * Returns pointer to the DRBG on success, NULL on failure. * */ -RAND_DRBG *RAND_DRBG_get0_master(void) +RAND_DRBG *OPENSSL_CTX_get0_master_drbg(OPENSSL_CTX *ctx) { - if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) + DRBG_GLOBAL *dgbl = drbg_get_global(ctx); + + if (dgbl == NULL) return NULL; - return master_drbg; + return dgbl->master_drbg; +} + +RAND_DRBG *RAND_DRBG_get0_master(void) +{ + return OPENSSL_CTX_get0_master_drbg(NULL); } /* * Get the public DRBG. * Returns pointer to the DRBG on success, NULL on failure. */ -RAND_DRBG *RAND_DRBG_get0_public(void) +RAND_DRBG *OPENSSL_CTX_get0_public_drbg(OPENSSL_CTX *ctx) { + DRBG_GLOBAL *dgbl = drbg_get_global(ctx); RAND_DRBG *drbg; - if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) + if (dgbl == NULL) return NULL; - drbg = CRYPTO_THREAD_get_local(&public_drbg); + drbg = CRYPTO_THREAD_get_local(&dgbl->public_drbg); if (drbg == NULL) { if (!ossl_init_thread_start(OPENSSL_INIT_THREAD_RAND)) return NULL; - drbg = drbg_setup(master_drbg, RAND_DRBG_TYPE_PUBLIC); - CRYPTO_THREAD_set_local(&public_drbg, drbg); + drbg = drbg_setup(ctx, dgbl->master_drbg, RAND_DRBG_TYPE_PUBLIC); + CRYPTO_THREAD_set_local(&dgbl->public_drbg, drbg); } return drbg; } +RAND_DRBG *RAND_DRBG_get0_public(void) +{ + return OPENSSL_CTX_get0_public_drbg(NULL); +} + /* * Get the private DRBG. * Returns pointer to the DRBG on success, NULL on failure. */ -RAND_DRBG *RAND_DRBG_get0_private(void) +RAND_DRBG *OPENSSL_CTX_get0_private_drbg(OPENSSL_CTX *ctx) { + DRBG_GLOBAL *dgbl = drbg_get_global(ctx); RAND_DRBG *drbg; - if (!RUN_ONCE(&rand_drbg_init, do_rand_drbg_init)) + if (dgbl == NULL) return NULL; - drbg = CRYPTO_THREAD_get_local(&private_drbg); + drbg = CRYPTO_THREAD_get_local(&dgbl->private_drbg); if (drbg == NULL) { if (!ossl_init_thread_start(OPENSSL_INIT_THREAD_RAND)) return NULL; - drbg = drbg_setup(master_drbg, RAND_DRBG_TYPE_PRIVATE); - CRYPTO_THREAD_set_local(&private_drbg, drbg); + drbg = drbg_setup(ctx, dgbl->master_drbg, RAND_DRBG_TYPE_PRIVATE); + CRYPTO_THREAD_set_local(&dgbl->private_drbg, drbg); } return drbg; } +RAND_DRBG *RAND_DRBG_get0_private(void) +{ + return OPENSSL_CTX_get0_private_drbg(NULL); +} + RAND_METHOD rand_meth = { drbg_seed, drbg_bytes, |