diff options
Diffstat (limited to 'appl/rsh/common.c')
| -rw-r--r-- | appl/rsh/common.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/appl/rsh/common.c b/appl/rsh/common.c new file mode 100644 index 0000000..84311b0 --- /dev/null +++ b/appl/rsh/common.c @@ -0,0 +1,180 @@ +/* + * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * 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. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 "rsh_locl.h" +RCSID("$Id: common.c 17450 2006-05-05 11:11:43Z lha $"); + +#if defined(KRB4) || defined(KRB5) + +#ifdef KRB5 +int key_usage = 1026; + +void *ivec_in[2]; +void *ivec_out[2]; + +void +init_ivecs(int client, int have_errsock) +{ + size_t blocksize; + + krb5_crypto_getblocksize(context, crypto, &blocksize); + + ivec_in[0] = malloc(blocksize); + memset(ivec_in[0], client, blocksize); + + if(have_errsock) { + ivec_in[1] = malloc(blocksize); + memset(ivec_in[1], 2 | client, blocksize); + } else + ivec_in[1] = ivec_in[0]; + + ivec_out[0] = malloc(blocksize); + memset(ivec_out[0], !client, blocksize); + + if(have_errsock) { + ivec_out[1] = malloc(blocksize); + memset(ivec_out[1], 2 | !client, blocksize); + } else + ivec_out[1] = ivec_out[0]; +} +#endif + + +ssize_t +do_read (int fd, void *buf, size_t sz, void *ivec) +{ + if (do_encrypt) { +#ifdef KRB4 + if (auth_method == AUTH_KRB4) { + return des_enc_read (fd, buf, sz, schedule, &iv); + } else +#endif /* KRB4 */ +#ifdef KRB5 + if(auth_method == AUTH_KRB5) { + krb5_error_code ret; + uint32_t len, outer_len; + int status; + krb5_data data; + void *edata; + + ret = krb5_net_read (context, &fd, &len, 4); + if (ret <= 0) + return ret; + len = ntohl(len); + if (len > sz) + abort (); + /* ivec will be non null for protocol version 2 */ + if(ivec != NULL) + outer_len = krb5_get_wrapped_length (context, crypto, len + 4); + else + outer_len = krb5_get_wrapped_length (context, crypto, len); + edata = malloc (outer_len); + if (edata == NULL) + errx (1, "malloc: cannot allocate %u bytes", outer_len); + ret = krb5_net_read (context, &fd, edata, outer_len); + if (ret <= 0) + return ret; + + status = krb5_decrypt_ivec(context, crypto, key_usage, + edata, outer_len, &data, ivec); + free (edata); + + if (status) + krb5_err (context, 1, status, "decrypting data"); + if(ivec != NULL) { + unsigned long l; + if(data.length < len + 4) + errx (1, "data received is too short"); + _krb5_get_int(data.data, &l, 4); + if(l != len) + errx (1, "inconsistency in received data"); + memcpy (buf, (unsigned char *)data.data+4, len); + } else + memcpy (buf, data.data, len); + krb5_data_free (&data); + return len; + } else +#endif /* KRB5 */ + abort (); + } else + return read (fd, buf, sz); +} + +ssize_t +do_write (int fd, void *buf, size_t sz, void *ivec) +{ + if (do_encrypt) { +#ifdef KRB4 + if(auth_method == AUTH_KRB4) { + return des_enc_write (fd, buf, sz, schedule, &iv); + } else +#endif /* KRB4 */ +#ifdef KRB5 + if(auth_method == AUTH_KRB5) { + krb5_error_code status; + krb5_data data; + unsigned char len[4]; + int ret; + + _krb5_put_int(len, sz, 4); + if(ivec != NULL) { + unsigned char *tmp = malloc(sz + 4); + if(tmp == NULL) + err(1, "malloc"); + _krb5_put_int(tmp, sz, 4); + memcpy(tmp + 4, buf, sz); + status = krb5_encrypt_ivec(context, crypto, key_usage, + tmp, sz + 4, &data, ivec); + free(tmp); + } else + status = krb5_encrypt_ivec(context, crypto, key_usage, + buf, sz, &data, ivec); + + if (status) + krb5_err(context, 1, status, "encrypting data"); + + ret = krb5_net_write (context, &fd, len, 4); + if (ret != 4) + return ret; + ret = krb5_net_write (context, &fd, data.data, data.length); + if (ret != data.length) + return ret; + free (data.data); + return sz; + } else +#endif /* KRB5 */ + abort(); + } else + return write (fd, buf, sz); +} +#endif /* KRB4 || KRB5 */ |
