Add return values to set_encrypt_key and set_decrypt_key.
git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@519 7dcaeef0-15fb-0310-b436-a5af3365683c
Этот коммит содержится в:
Andreas Schneider
родитель
32fd37d1ad
Коммит
845615cdd8
@ -54,15 +54,21 @@ struct crypto_struct {
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#endif
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unsigned int keysize; /* bytes of key used. != keylen */
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#ifdef HAVE_LIBGCRYPT
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void (*set_encrypt_key)(struct crypto_struct *cipher, void *key, void *IV); /* sets the new key for immediate use */
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void (*set_decrypt_key)(struct crypto_struct *cipher, void *key, void *IV);
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void (*cbc_encrypt)(struct crypto_struct *cipher, void *in, void *out,unsigned long len);
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void (*cbc_decrypt)(struct crypto_struct *cipher, void *in, void *out,unsigned long len);
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/* sets the new key for immediate use */
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int (*set_encrypt_key)(struct crypto_struct *cipher, void *key, void *IV);
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int (*set_decrypt_key)(struct crypto_struct *cipher, void *key, void *IV);
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void (*cbc_encrypt)(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len);
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void (*cbc_decrypt)(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len);
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#elif defined HAVE_LIBCRYPTO
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void (*set_encrypt_key)(struct crypto_struct *cipher, void *key); /* sets the new key for immediate use */
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void (*set_decrypt_key)(struct crypto_struct *cipher, void *key);
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void (*cbc_encrypt)(struct crypto_struct *cipher, void *in, void *out,unsigned long len,void *IV);
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void (*cbc_decrypt)(struct crypto_struct *cipher, void *in, void *out,unsigned long len,void *IV);
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/* sets the new key for immediate use */
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int (*set_encrypt_key)(struct crypto_struct *cipher, void *key);
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int (*set_decrypt_key)(struct crypto_struct *cipher, void *key);
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void (*cbc_encrypt)(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len, void *IV);
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void (*cbc_decrypt)(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len, void *IV);
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#endif
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};
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@ -67,10 +67,17 @@ int packet_decrypt(SSH_SESSION *session, void *data,u32 len) {
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ssh_log(session,SSH_LOG_PACKET, "Decrypting %d bytes", len);
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#ifdef HAVE_LIBGCRYPT
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crypto->set_decrypt_key(crypto,session->current_crypto->decryptkey,session->current_crypto->decryptIV);
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if (crypto->set_decrypt_key(crypto, session->current_crypto->decryptkey,
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session->current_crypto->decryptIV) < 0) {
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SAFE_FREE(out);
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return -1;
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}
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crypto->cbc_decrypt(crypto,data,out,len);
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#elif defined HAVE_LIBCRYPTO
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crypto->set_decrypt_key(crypto,session->current_crypto->decryptkey);
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if (crypto->set_decrypt_key(crypto, session->current_crypto->decryptkey) < 0) {
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SAFE_FREE(out);
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return -1;
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}
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crypto->cbc_decrypt(crypto,data,out,len,session->current_crypto->decryptIV);
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#endif
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@ -105,10 +112,16 @@ unsigned char *packet_encrypt(SSH_SESSION *session, void *data, u32 len) {
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session->send_seq,len);
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#ifdef HAVE_LIBGCRYPT
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crypto->set_encrypt_key(crypto, session->current_crypto->encryptkey,
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session->current_crypto->encryptIV);
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if (crypto->set_encrypt_key(crypto, session->current_crypto->encryptkey,
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session->current_crypto->encryptIV) < 0) {
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SAFE_FREE(out);
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return NULL;
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}
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#elif defined HAVE_LIBCRYPTO
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crypto->set_encrypt_key(crypto, session->current_crypto->encryptkey);
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if (crypto->set_encrypt_key(crypto, session->current_crypto->encryptkey) < 0) {
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SAFE_FREE(out);
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return NULL;
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}
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#endif
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if (session->version == 2) {
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416
libssh/wrapper.c
416
libssh/wrapper.c
@ -39,7 +39,6 @@
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#include <stdio.h>
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#include <string.h>
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/* TODO FIXME */
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static int alloc_key(struct crypto_struct *cipher) {
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cipher->key = malloc(cipher->keylen);
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if (cipher->key == NULL) {
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@ -120,108 +119,188 @@ void hmac_final(HMACCTX c, unsigned char *hashmacbuf, unsigned int *len) {
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}
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/* the wrapper functions for blowfish */
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static void blowfish_set_key(struct crypto_struct *cipher, void *key, void *IV){
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if(cipher->key == NULL) {
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/* TODO FIXME */
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if (alloc_key(cipher) < 0) {
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return;
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}
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gcry_cipher_open(&cipher->key[0],GCRY_CIPHER_BLOWFISH,GCRY_CIPHER_MODE_CBC,0);
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gcry_cipher_setkey(cipher->key[0],key,16);
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gcry_cipher_setiv(cipher->key[0],IV,8);
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static int blowfish_set_key(struct crypto_struct *cipher, void *key, void *IV){
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if (cipher->key == NULL) {
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if (alloc_key(cipher) < 0) {
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return -1;
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}
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}
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static void blowfish_encrypt(struct crypto_struct *cipher, void *in, void *out,unsigned long len){
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gcry_cipher_encrypt(cipher->key[0],out,len,in,len);
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}
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static void blowfish_decrypt(struct crypto_struct *cipher, void *in, void *out, unsigned long len){
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gcry_cipher_decrypt(cipher->key[0],out,len,in,len);
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}
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static void aes_set_key(struct crypto_struct *cipher, void *key, void *IV){
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if(!cipher->key){
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/* TODO FIXME */
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if (alloc_key(cipher) < 0) {
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return;
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}
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switch(cipher->keysize){
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case 128:
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gcry_cipher_open(&cipher->key[0],GCRY_CIPHER_AES128,GCRY_CIPHER_MODE_CBC,0);
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break;
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case 192:
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gcry_cipher_open(&cipher->key[0],GCRY_CIPHER_AES192,GCRY_CIPHER_MODE_CBC,0);
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break;
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case 256:
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gcry_cipher_open(&cipher->key[0],GCRY_CIPHER_AES256,GCRY_CIPHER_MODE_CBC,0);
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break;
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}
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gcry_cipher_setkey(cipher->key[0],key,cipher->keysize/8);
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gcry_cipher_setiv(cipher->key[0], IV, 16);
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if (gcry_cipher_open(&cipher->key[0], GCRY_CIPHER_BLOWFISH,
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GCRY_CIPHER_MODE_CBC, 0)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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}
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static void aes_encrypt(struct crypto_struct *cipher, void *in, void *out, unsigned long len){
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gcry_cipher_encrypt(cipher->key[0],out,len,in,len);
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}
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static void aes_decrypt(struct crypto_struct *cipher, void *in, void *out,unsigned long len){
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gcry_cipher_decrypt(cipher->key[0],out,len,in,len);
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}
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static void des3_set_key(struct crypto_struct *cipher, void *key, void *IV){
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if(!cipher->key){
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/* TODO FIXME */
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if (alloc_key(cipher) < 0) {
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return;
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}
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gcry_cipher_open(&cipher->key[0],GCRY_CIPHER_3DES,GCRY_CIPHER_MODE_CBC,0);
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gcry_cipher_setkey(cipher->key[0],key,24);
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gcry_cipher_setiv(cipher->key[0],IV,8);
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if (gcry_cipher_setkey(cipher->key[0], key, 16)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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}
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static void des3_encrypt(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len){
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gcry_cipher_encrypt(cipher->key[0],out,len,in,len);
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}
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static void des3_decrypt(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len){
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gcry_cipher_decrypt(cipher->key[0],out,len,in,len);
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}
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static void des3_1_set_key(struct crypto_struct *cipher, void *key, void *IV){
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if(!cipher->key){
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/* TODO FIXME */
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if (alloc_key(cipher) < 0) {
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return;
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}
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gcry_cipher_open(&cipher->key[0],GCRY_CIPHER_DES,GCRY_CIPHER_MODE_CBC,0);
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gcry_cipher_setkey(cipher->key[0],key,8);
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gcry_cipher_setiv(cipher->key[0],IV,8);
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gcry_cipher_open(&cipher->key[1],GCRY_CIPHER_DES,GCRY_CIPHER_MODE_CBC,0);
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gcry_cipher_setkey(cipher->key[1],key+8,8);
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gcry_cipher_setiv(cipher->key[1],IV+8,8);
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gcry_cipher_open(&cipher->key[2],GCRY_CIPHER_DES,GCRY_CIPHER_MODE_CBC,0);
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gcry_cipher_setkey(cipher->key[2],key+16,8);
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gcry_cipher_setiv(cipher->key[2],IV+16,8);
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if (gcry_cipher_setiv(cipher->key[0], IV, 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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}
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return 0;
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}
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static void des3_1_encrypt(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len){
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gcry_cipher_encrypt(cipher->key[0],out,len,in,len);
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gcry_cipher_decrypt(cipher->key[1],in,len,out,len);
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gcry_cipher_encrypt(cipher->key[2],out,len,in,len);
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static void blowfish_encrypt(struct crypto_struct *cipher, void *in,
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void *out, unsigned long len) {
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gcry_cipher_encrypt(cipher->key[0], out, len, in, len);
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}
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static void des3_1_decrypt(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len){
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gcry_cipher_decrypt(cipher->key[2],out,len,in,len);
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gcry_cipher_encrypt(cipher->key[1],in,len,out,len);
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gcry_cipher_decrypt(cipher->key[0],out,len,in,len);
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static void blowfish_decrypt(struct crypto_struct *cipher, void *in,
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void *out, unsigned long len) {
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gcry_cipher_decrypt(cipher->key[0], out, len, in, len);
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}
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static int aes_set_key(struct crypto_struct *cipher, void *key, void *IV) {
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if (cipher->key == NULL) {
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if (alloc_key(cipher) < 0) {
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return -1;
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}
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switch (cipher->keysize) {
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case 128:
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if (gcry_cipher_open(&cipher->key[0], GCRY_CIPHER_AES128,
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GCRY_CIPHER_MODE_CBC, 0)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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break;
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case 192:
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if (gcry_cipher_open(&cipher->key[0], GCRY_CIPHER_AES192,
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GCRY_CIPHER_MODE_CBC, 0)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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break;
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case 256:
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if (gcry_cipher_open(&cipher->key[0], GCRY_CIPHER_AES256,
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GCRY_CIPHER_MODE_CBC, 0)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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break;
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}
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if (gcry_cipher_setkey(cipher->key[0], key, cipher->keysize / 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setiv(cipher->key[0], IV, 16)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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}
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return 0;
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}
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static void aes_encrypt(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len) {
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gcry_cipher_encrypt(cipher->key[0], out, len, in, len);
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}
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static void aes_decrypt(struct crypto_struct *cipher, void *in, void *out,
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unsigned long len) {
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gcry_cipher_decrypt(cipher->key[0], out, len, in, len);
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}
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static int des3_set_key(struct crypto_struct *cipher, void *key, void *IV) {
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if (cipher->key == NULL) {
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if (alloc_key(cipher) < 0) {
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return -1;
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}
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if (gcry_cipher_open(&cipher->key[0], GCRY_CIPHER_3DES,
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GCRY_CIPHER_MODE_CBC, 0)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setkey(cipher->key[0], key, 24)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setiv(cipher->key[0], IV, 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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}
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return 0;
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}
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static void des3_encrypt(struct crypto_struct *cipher, void *in,
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void *out, unsigned long len) {
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gcry_cipher_encrypt(cipher->key[0], out, len, in, len);
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}
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static void des3_decrypt(struct crypto_struct *cipher, void *in,
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void *out, unsigned long len) {
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gcry_cipher_decrypt(cipher->key[0], out, len, in, len);
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}
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static int des3_1_set_key(struct crypto_struct *cipher, void *key, void *IV) {
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if (cipher->key == NULL) {
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if (alloc_key(cipher) < 0) {
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return -1;
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}
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if (gcry_cipher_open(&cipher->key[0], GCRY_CIPHER_DES,
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GCRY_CIPHER_MODE_CBC, 0)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setkey(cipher->key[0], key, 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setiv(cipher->key[0], IV, 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_open(&cipher->key[1], GCRY_CIPHER_DES,
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GCRY_CIPHER_MODE_CBC, 0)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setkey(cipher->key[1], key + 8, 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setiv(cipher->key[1], IV + 8, 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_open(&cipher->key[2], GCRY_CIPHER_DES,
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GCRY_CIPHER_MODE_CBC, 0)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setkey(cipher->key[2], key + 16, 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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if (gcry_cipher_setiv(cipher->key[2], IV + 16, 8)) {
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SAFE_FREE(cipher->key);
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return -1;
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}
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}
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return 0;
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}
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static void des3_1_encrypt(struct crypto_struct *cipher, void *in,
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void *out, unsigned long len) {
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gcry_cipher_encrypt(cipher->key[0], out, len, in, len);
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gcry_cipher_decrypt(cipher->key[1], in, len, out, len);
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gcry_cipher_encrypt(cipher->key[2], out, len, in, len);
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}
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static void des3_1_decrypt(struct crypto_struct *cipher, void *in,
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void *out, unsigned long len) {
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gcry_cipher_decrypt(cipher->key[2], out, len, in, len);
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gcry_cipher_encrypt(cipher->key[1], in, len, out, len);
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gcry_cipher_decrypt(cipher->key[0], out, len, in, len);
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}
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/* the table of supported ciphers */
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@ -357,100 +436,123 @@ static void blowfish_set_key(struct crypto_struct *cipher, void *key){
|
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}
|
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}
|
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|
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static void blowfish_encrypt(struct crypto_struct *cipher, void *in, void *out,unsigned long len,void *IV){
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BF_cbc_encrypt(in,out,len,cipher->key,IV,BF_ENCRYPT);
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static void blowfish_encrypt(struct crypto_struct *cipher, void *in,
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void *out, unsigned long len, void *IV) {
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BF_cbc_encrypt(in,out,len,cipher->key,IV,BF_ENCRYPT);
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}
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static void blowfish_decrypt(struct crypto_struct *cipher, void *in, void *out,unsigned long len,void *IV){
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static void blowfish_decrypt(struct crypto_struct *cipher, void *in,
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void *out, unsigned long len, void *IV) {
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BF_cbc_encrypt(in,out,len,cipher->key,IV,BF_DECRYPT);
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}
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#endif
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#endif /* HAS_BLOWFISH */
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|
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#ifdef HAS_AES
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static void aes_set_encrypt_key(struct crypto_struct *cipher, void *key){
|
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if(!cipher->key){
|
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/* TODO FIXME */
|
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if (alloc_key(cipher) < 0) {
|
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return;
|
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}
|
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AES_set_encrypt_key(key,cipher->keysize,cipher->key);
|
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static int aes_set_encrypt_key(struct crypto_struct *cipher, void *key) {
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if (cipher->key == NULL) {
|
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if (alloc_key(cipher) < 0) {
|
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return -1;
|
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}
|
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}
|
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static void aes_set_decrypt_key(struct crypto_struct *cipher, void *key){
|
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if(!cipher->key){
|
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/* TODO FIXME */
|
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if (alloc_key(cipher) < 0) {
|
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return;
|
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}
|
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AES_set_decrypt_key(key,cipher->keysize,cipher->key);
|
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if (AES_set_encrypt_key(key,cipher->keysize,cipher->key) < 0) {
|
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SAFE_FREE(cipher->key);
|
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return -1;
|
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}
|
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}
|
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|
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return 0;
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}
|
||||
static void aes_encrypt(struct crypto_struct *cipher, void *in, void *out, unsigned long len, void *IV){
|
||||
AES_cbc_encrypt(in,out,len,cipher->key,IV,AES_ENCRYPT);
|
||||
static int aes_set_decrypt_key(struct crypto_struct *cipher, void *key) {
|
||||
if (cipher->key == NULL) {
|
||||
if (alloc_key(cipher) < 0) {
|
||||
return -1;
|
||||
}
|
||||
if (AES_set_decrypt_key(key,cipher->keysize,cipher->key) < 0) {
|
||||
SAFE_FREE(cipher->key);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
}
|
||||
static void aes_decrypt(struct crypto_struct *cipher, void *in, void *out, unsigned long len, void *IV){
|
||||
AES_cbc_encrypt(in,out,len,cipher->key,IV,AES_DECRYPT);
|
||||
|
||||
static void aes_encrypt(struct crypto_struct *cipher, void *in, void *out,
|
||||
unsigned long len, void *IV) {
|
||||
AES_cbc_encrypt(in, out, len, cipher->key, IV, AES_ENCRYPT);
|
||||
}
|
||||
#endif
|
||||
|
||||
static void aes_decrypt(struct crypto_struct *cipher, void *in, void *out,
|
||||
unsigned long len, void *IV) {
|
||||
AES_cbc_encrypt(in, out, len, cipher->key, IV, AES_DECRYPT);
|
||||
}
|
||||
#endif /* HAS_AES */
|
||||
|
||||
#ifdef HAS_DES
|
||||
static void des3_set_key(struct crypto_struct *cipher, void *key){
|
||||
if(!cipher->key){
|
||||
/* TODO FIXME */
|
||||
if (alloc_key(cipher) < 0) {
|
||||
return;
|
||||
}
|
||||
DES_set_odd_parity(key);
|
||||
DES_set_odd_parity(key+8);
|
||||
DES_set_odd_parity(key+16);
|
||||
DES_set_key_unchecked(key,cipher->key);
|
||||
DES_set_key_unchecked(key+8,cipher->key+sizeof(DES_key_schedule));
|
||||
DES_set_key_unchecked(key+16,cipher->key+2*sizeof(DES_key_schedule));
|
||||
static int des3_set_key(struct crypto_struct *cipher, void *key) {
|
||||
if (cipher->key == NULL) {
|
||||
if (alloc_key(cipher) < 0) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
DES_set_odd_parity(key);
|
||||
DES_set_odd_parity(key + 8);
|
||||
DES_set_odd_parity(key + 16);
|
||||
DES_set_key_unchecked(key, cipher->key);
|
||||
DES_set_key_unchecked(key + 8, cipher->key + sizeof(DES_key_schedule));
|
||||
DES_set_key_unchecked(key + 16, cipher->key + 2 * sizeof(DES_key_schedule));
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void des3_encrypt(struct crypto_struct *cipher, void *in, void *out,
|
||||
unsigned long len, void *IV){
|
||||
DES_ede3_cbc_encrypt(in,out,len,cipher->key,cipher->key+sizeof(DES_key_schedule),cipher->key+2*sizeof(DES_key_schedule),IV,1);
|
||||
static void des3_encrypt(struct crypto_struct *cipher, void *in,
|
||||
void *out, unsigned long len, void *IV) {
|
||||
DES_ede3_cbc_encrypt(in, out, len, cipher->key,
|
||||
cipher->key + sizeof(DES_key_schedule),
|
||||
cipher->key + 2 * sizeof(DES_key_schedule),
|
||||
IV, 1);
|
||||
}
|
||||
|
||||
static void des3_decrypt(struct crypto_struct *cipher, void *in, void *out,
|
||||
unsigned long len, void *IV){
|
||||
DES_ede3_cbc_encrypt(in,out,len,cipher->key,cipher->key+sizeof(DES_key_schedule),cipher->key+2*sizeof(DES_key_schedule),IV,0);
|
||||
static void des3_decrypt(struct crypto_struct *cipher, void *in,
|
||||
void *out, unsigned long len, void *IV) {
|
||||
DES_ede3_cbc_encrypt(in, out, len, cipher->key,
|
||||
cipher->key + sizeof(DES_key_schedule),
|
||||
cipher->key + 2 * sizeof(DES_key_schedule),
|
||||
IV, 0);
|
||||
}
|
||||
|
||||
static void des3_1_encrypt(struct crypto_struct *cipher, void *in, void *out,
|
||||
unsigned long len, void *IV){
|
||||
static void des3_1_encrypt(struct crypto_struct *cipher, void *in,
|
||||
void *out, unsigned long len, void *IV) {
|
||||
#ifdef DEBUG_CRYPTO
|
||||
ssh_print_hexa("encrypt IV before",IV,24);
|
||||
ssh_print_hexa("Encrypt IV before", IV, 24);
|
||||
#endif
|
||||
DES_ncbc_encrypt(in,out,len, cipher->key, IV, 1);
|
||||
DES_ncbc_encrypt(out,in,len, cipher->key + sizeof(DES_key_schedule),
|
||||
IV+8,0);
|
||||
DES_ncbc_encrypt(in,out,len, cipher->key + 2*sizeof(DES_key_schedule),
|
||||
IV+16,1);
|
||||
DES_ncbc_encrypt(in, out, len, cipher->key, IV, 1);
|
||||
DES_ncbc_encrypt(out, in, len, cipher->key + sizeof(DES_key_schedule),
|
||||
IV + 8, 0);
|
||||
DES_ncbc_encrypt(in, out, len, cipher->key + 2 * sizeof(DES_key_schedule),
|
||||
IV + 16, 1);
|
||||
#ifdef DEBUG_CRYPTO
|
||||
ssh_print_hexa("encrypt IV after",IV,24);
|
||||
ssh_print_hexa("Encrypt IV after", IV, 24);
|
||||
#endif
|
||||
}
|
||||
|
||||
static void des3_1_decrypt(struct crypto_struct *cipher, void *in, void *out,
|
||||
unsigned long len, void *IV){
|
||||
static void des3_1_decrypt(struct crypto_struct *cipher, void *in,
|
||||
void *out, unsigned long len, void *IV) {
|
||||
#ifdef DEBUG_CRYPTO
|
||||
ssh_print_hexa("decrypt IV before",IV,24);
|
||||
ssh_print_hexa("Decrypt IV before", IV, 24);
|
||||
#endif
|
||||
DES_ncbc_encrypt(in,out,len, cipher->key + 2*sizeof(DES_key_schedule),
|
||||
IV, 0);
|
||||
DES_ncbc_encrypt(out,in,len, cipher->key + sizeof(DES_key_schedule),
|
||||
IV+8,1);
|
||||
DES_ncbc_encrypt(in,out,len, cipher->key,
|
||||
IV+16,0);
|
||||
|
||||
DES_ncbc_encrypt(in, out, len, cipher->key + 2 * sizeof(DES_key_schedule),
|
||||
IV, 0);
|
||||
DES_ncbc_encrypt(out, in, len, cipher->key + sizeof(DES_key_schedule),
|
||||
IV + 8, 1);
|
||||
DES_ncbc_encrypt(in, out, len, cipher->key, IV + 16, 0);
|
||||
|
||||
#ifdef DEBUG_CRYPTO
|
||||
ssh_print_hexa("decrypt IV after",IV,24);
|
||||
ssh_print_hexa("Decrypt IV after", IV, 24);
|
||||
#endif
|
||||
}
|
||||
#endif
|
||||
#endif /* HAS_DES */
|
||||
|
||||
/* the table of supported ciphers */
|
||||
static struct crypto_struct ssh_ciphertab[]={
|
||||
static struct crypto_struct ssh_ciphertab[] = {
|
||||
#ifdef HAS_BLOWFISH
|
||||
{ "blowfish-cbc", 8 ,sizeof (BF_KEY),NULL,128,blowfish_set_key,
|
||||
blowfish_set_key,blowfish_encrypt, blowfish_decrypt},
|
||||
|
||||
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Ссылка в новой задаче
Block a user