spp_enc.c 9.38 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
#include <stdio.h>
#include "ssl_locl.h"
#include "openssl/ssl.h"
#ifndef OPENSSL_NO_COMP
#include <openssl/comp.h>
#endif
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/md5.h>
#include <openssl/rand.h>
#ifdef KSSL_DEBUG
#include <openssl/des.h>
#endif

int spp_enc(SSL *s, int send) {
    SPP_SLICE *slice;
    
    if (!(SSL_in_init(s) || s->in_handshake)) {
        if (send) {
            slice = s->write_slice;
        } else {
            slice = s->read_slice;
        }
        // Error if a slice has not been specified for this encrypt/decrypt op
        if (slice == NULL) {
            SSLerr(SSL_F_SPP_ENC,SPP_R_MISSING_SLICE);
            return -1;
        }

        /* If we do not possess the encryption material for this slice, 
         * do not attempt to decrypt. Not Needed, see below. */
        //if (!slice->have_material) {
            /* Copy the still encrypted content to the correct location. */
        //    return 1;
        //}

        /* Pick the right slice, and encrypt with it. */
        /* If we do not have the encryption material, slice->enc_XXX_ctx should be null. 
         * In that case, tls1 applies the null cipher. */
        if (send) {
            s->enc_write_ctx = slice->read_ciph->enc_write_ctx;
        } else if (!send) {
            s->enc_read_ctx = slice->read_ciph->enc_read_ctx;
        }
    }
    return tls1_enc(s, send);
}

int xor_array(unsigned char* dst, unsigned char* src1, unsigned char* src2, size_t len) {
    size_t i;
    for (i = 0; i < len; i++) {
        *(dst++) = *(src1++) ^ *(src2++);
    }
    return 1;
}

int spp_init_slice_st(SSL *s, SPP_SLICE *slice, int which) {
    const EVP_CIPHER *c;
    const EVP_MD *m;    
    int is_exp,cl,k;
    unsigned char key_ex[EVP_MAX_KEY_LENGTH];
    unsigned char iv_ex[EVP_MAX_KEY_LENGTH];
    unsigned char *key, *iv;
    int mac_type;
    EVP_PKEY *mac_key;
    EVP_MD_CTX md;
    mac_type = s->s3->tmp.new_mac_pkey_type;
    m=s->s3->tmp.new_hash;
    key = &(key_ex[0]);
    iv = &(iv_ex[0]);
    is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);    
    c=s->s3->tmp.new_sym_enc;
    
    cl=EVP_CIPHER_key_length(c);
    k=EVP_CIPHER_iv_length(c);
    //printf("Init slice %d\n", slice->slice_id);
    
    if (which & SSL3_CC_READ) {
        //printf("which=read\n");
        if (slice->read_access) {
            // Secret is computed by XORing the material generated by the client and server
            xor_array(key, slice->read_mat, slice->other_read_mat, EVP_MAX_KEY_LENGTH);

            // Generate the encryption contexts.
            //printf("encryption init\n");
            if (slice->read_ciph == NULL) {
                if ((slice->read_ciph=OPENSSL_malloc(sizeof(SPP_CIPH))) == NULL)
                    goto err;
            }
            if ((slice->read_ciph->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
                goto err;
            EVP_CIPHER_CTX_init(slice->read_ciph->enc_read_ctx);
            EVP_CipherInit_ex(slice->read_ciph->enc_read_ctx,c,NULL,key,iv,(which & SSL3_CC_WRITE));

            // And the read mac contexts

            //printf("read mac init\n");
            if ((slice->read_mac=spp_init_mac_st(s, slice->read_mac, key, which)) == NULL) {
                goto err;
            }
        } else {
            if (slice->read_ciph == NULL) {
                if ((slice->read_ciph=OPENSSL_malloc(sizeof(SPP_CIPH))) == NULL)
                    goto err;
            }
            slice->read_ciph->enc_read_ctx = NULL;
        }
        if (slice->write_access) {
            xor_array(key, slice->write_mat, slice->other_write_mat, EVP_MAX_KEY_LENGTH);

            // Generate the write mac context

            //printf("write mac init\n");
            if ((slice->write_mac=spp_init_mac_st(s, slice->write_mac, key, which)) == NULL) {
                goto err;
            }
        }
    } else {
        //printf("which=write\n");
        if (slice->read_access) {
            // Secret is computed by XORing the material generated by the client and server
            xor_array(key, slice->read_mat, slice->other_read_mat, EVP_MAX_KEY_LENGTH);

            // Generate the encryption contexts.

            if (slice->read_ciph == NULL) {
                if ((slice->read_ciph=OPENSSL_malloc(sizeof(SPP_CIPH))) == NULL)
                    goto err;
            }

            //printf("encryption init\n");
            if ((slice->read_ciph->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
                goto err;
            EVP_CIPHER_CTX_init(slice->read_ciph->enc_write_ctx);
            EVP_CipherInit_ex(slice->read_ciph->enc_write_ctx,c,NULL,key,iv,(which & SSL3_CC_WRITE));

            // And the read mac contexts

            //printf("read mac init\n");
            if ((slice->read_mac=spp_init_mac_st(s, slice->read_mac, key, which)) == NULL) {
                goto err;
            }
        } else {
            if (slice->read_ciph == NULL) {
                if ((slice->read_ciph=OPENSSL_malloc(sizeof(SPP_CIPH))) == NULL)
                    goto err;
            }
            slice->read_ciph->enc_write_ctx = NULL;
        }
        if (slice->write_access) {            
            xor_array(key, slice->write_mat, slice->other_write_mat, EVP_MAX_KEY_LENGTH);

            // Generate the write mac context

            //printf("write mac init\n");
            if ((slice->write_mac=spp_init_mac_st(s, slice->write_mac, key, which)) == NULL) {
                goto err;
            }
        }
    }
    return 1;
err:
    printf("Error in slice init\n");
    return -1;
}

SPP_MAC* spp_init_mac_st(SSL* s, SPP_MAC* mac, unsigned char* key, int which) {
    int mac_type;
    EVP_PKEY *mac_key;
    EVP_MD_CTX md;
    const EVP_MD *m;
    
    mac_type = s->s3->tmp.new_mac_pkey_type;
    m=s->s3->tmp.new_hash;
    
    if (mac == NULL) {
        if ((mac=OPENSSL_malloc(sizeof(SPP_MAC))) == NULL) {
            return NULL;
        }
    }
    if (which & SSL3_CC_READ) {
        mac->read_hash = EVP_MD_CTX_create();
        //ssl_replace_hash(&(mac->read_hash),NULL);
        memset(&(mac->read_sequence[0]),0,8);
        mac->read_mac_secret_size = s->s3->tmp.new_mac_secret_size;
        OPENSSL_assert(mac->read_mac_secret_size <= EVP_MAX_MD_SIZE);
        memcpy(&(mac->read_mac_secret[0]), key, mac->read_mac_secret_size);
        mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,&(mac->read_mac_secret[0]),mac->read_mac_secret_size);
        EVP_DigestSignInit(mac->read_hash,NULL,m,NULL,mac_key);
        EVP_PKEY_free(mac_key);
    } else {
        mac->write_hash = EVP_MD_CTX_create();
        //ssl_replace_hash(&(mac->write_hash),NULL);
        memset(&(mac->write_sequence[0]),0,8);
        mac->write_mac_secret_size = s->s3->tmp.new_mac_secret_size;
        OPENSSL_assert(mac->write_mac_secret_size <= EVP_MAX_MD_SIZE);
        memcpy(&(mac->write_mac_secret[0]), key, mac->write_mac_secret_size);
        mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,&(mac->write_mac_secret[0]),mac->write_mac_secret_size);
        EVP_DigestSignInit(mac->write_hash,NULL,m,NULL,mac_key);
        EVP_PKEY_free(mac_key);
    }
    
    return mac;
}

int spp_init_slices_st(SSL *s, int which) {
    int i;
    for (i = 0; i < s->slices_len; i++) {
        if (spp_init_slice_st(s, s->slices[i], which) <= 0)
            return -1;
    }
    return 1;
}

int spp_init_integrity_st(SSL *s) {
    /*if (s->i_mac == NULL) {
        if ((s->i_mac=(SPP_MAC*)OPENSSL_malloc(sizeof(SPP_MAC)))==NULL)
            goto err;
        memset(&(s->i_mac->read_sequence[0]),0,8);
        memset(&(s->i_mac->write_sequence[0]),0,8);
        s->i_mac->read_mac_secret_size = s->s3->read_mac_secret_size;
        s->i_mac->write_mac_secret_size = s->s3->write_mac_secret_size;
        memcpy(&(s->i_mac->read_mac_secret[0]), &(s->s3->read_mac_secret[0]), s->s3->read_mac_secret_size);
        memcpy(&(s->i_mac->write_mac_secret[0]), &(s->s3->write_mac_secret[0]), s->s3->write_mac_secret_size); 
        s->i_mac->read_hash = s->read_hash;
        s->i_mac->write_hash = s->write_hash;
    }*/
    
    return 1;
err:
    return -1;
}

int spp_store_defaults(SSL *s, int which) {
    if (which & SSL3_CC_READ) {
        // MAC ctx
        memset(&(s->def_ctx->read_mac->read_sequence[0]),0,8);
        s->def_ctx->read_mac->read_mac_secret_size = s->s3->read_mac_secret_size;
        memcpy(&(s->def_ctx->read_mac->read_mac_secret[0]), &(s->s3->read_mac_secret[0]), s->s3->read_mac_secret_size);
        s->def_ctx->read_mac->read_hash = s->read_hash;
        s->def_ctx->read_access = 1;
        
        // Encrypt ctx
        s->def_ctx->read_ciph->enc_read_ctx = s->enc_read_ctx;
    } else {
        // MAC ctx
        memset(&(s->def_ctx->read_mac->write_sequence[0]),0,8);
        s->def_ctx->read_mac->write_mac_secret_size = s->s3->write_mac_secret_size;
        memcpy(&(s->def_ctx->read_mac->write_mac_secret[0]), &(s->s3->write_mac_secret[0]), s->s3->write_mac_secret_size); 
        s->def_ctx->read_mac->write_hash = s->write_hash;
        s->def_ctx->write_access = 1;
        
        // Encrypt ctx
        s->def_ctx->read_ciph->enc_write_ctx = s->enc_write_ctx;
    }
    return 1;
}

int spp_change_cipher_state(SSL *s, int which) {
    int ret=1;
    if (!s->proxy) {
        ret = tls1_change_cipher_state(s, which);
        if (ret <= 0) goto end;
        ret = spp_store_defaults(s, which);
        if (ret <= 0) goto end;
    }
    //ret = spp_init_slices_st(s, which);
    //if (ret <= 0) goto end;
end:
    return ret;
}