krb5_error_code
krb5_encrypt_tkt_part(krb5_context context,
const krb5_keyblock *key,
krb5_ticket *ticket)
{
krb5_data *data = 0;
int code;
size_t enclen;
if ((code = encode_krb5_enc_tkt_part(ticket->enc_part2, &data)))
goto Done;
if ((code = krb5_c_encrypt_length(context, key->enctype,
data->length, &enclen)))
goto Done;
ticket->enc_part.ciphertext.length = enclen;
if (!(ticket->enc_part.ciphertext.data = malloc(enclen))) {
code = ENOMEM;
goto Done;
}
if ((code = krb5_c_encrypt(context, key, KRB5_KEYUSAGE_KDC_REP_TICKET,
0, data, &ticket->enc_part))) {
free(ticket->enc_part.ciphertext.data);
ticket->enc_part.ciphertext.data = 0;
}
Done:
if (data) {
if (data->data)
free(data->data);
free(data);
}
return code;
}
krb5_error_code KRB5_CALLCONV
krb5_encrypt(krb5_context context, krb5_const_pointer inptr,
krb5_pointer outptr, size_t size, krb5_encrypt_block *eblock,
krb5_pointer ivec)
{
krb5_data inputd, ivecd;
krb5_enc_data outputd;
size_t blocksize, outlen;
krb5_error_code ret;
if (ivec) {
if ((ret = krb5_c_block_size(context, eblock->key->enctype, &blocksize)))
return(ret);
ivecd.length = blocksize;
ivecd.data = ivec;
}
/* size is the length of the input cleartext data */
inputd.length = size;
inputd.data = inptr;
/* The size of the output buffer isn't part of the old api. Not too
safe. So, we assume here that it's big enough. */
if ((ret = krb5_c_encrypt_length(context, eblock->key->enctype, size,
&outlen)))
return(ret);
outputd.ciphertext.length = outlen;
outputd.ciphertext.data = outptr;
return(krb5_c_encrypt(context, eblock->key, 0, ivec?&ivecd:0,
&inputd, &outputd));
}
krb5_error_code krb5_encrypt_data(krb5_context context, krb5_keyblock *key,
krb5_pointer ivec, krb5_data *data,
krb5_enc_data *enc_data)
{
krb5_error_code ret;
size_t enclen, blocksize;
krb5_data ivecd;
if ((ret = krb5_c_encrypt_length(context, key->enctype, data->length,
&enclen)))
return(ret);
if (ivec) {
if ((ret = krb5_c_block_size(context, key->enctype, &blocksize)))
return(ret);
ivecd.length = blocksize;
ivecd.data = ivec;
}
enc_data->magic = KV5M_ENC_DATA;
enc_data->kvno = 0;
enc_data->enctype = key->enctype;
enc_data->ciphertext.length = enclen;
if ((enc_data->ciphertext.data = malloc(enclen)) == NULL)
return(ENOMEM);
if ((ret = krb5_c_encrypt(context, key, 0, ivec?&ivecd:0, data, enc_data)))
free(enc_data->ciphertext.data);
return(ret);
}
static int gp_encrypt_buffer(krb5_context context, krb5_keyblock *key,
size_t len, void *buf, octet_string *out)
{
int ret;
krb5_data data_in;
krb5_enc_data enc_handle;
data_in.length = len;
data_in.data = buf;
memset(&enc_handle, '\0', sizeof(krb5_enc_data));
ret = krb5_c_encrypt_length(context,
GP_CREDS_HANDLE_KEY_ENCTYPE,
data_in.length,
(size_t *)&enc_handle.ciphertext.length);
if (ret) {
goto done;
}
enc_handle.ciphertext.data = malloc(enc_handle.ciphertext.length);
if (!enc_handle.ciphertext.data) {
ret = ENOMEM;
goto done;
}
ret = krb5_c_encrypt(context,
key,
KRB5_KEYUSAGE_APP_DATA_ENCRYPT,
NULL,
&data_in,
&enc_handle);
if (ret) {
ret = EINVAL;
goto done;
}
ret = gp_conv_octet_string(enc_handle.ciphertext.length,
enc_handle.ciphertext.data,
out);
if (ret) {
goto done;
}
done:
free(enc_handle.ciphertext.data);
return ret;
}
static krb5_error_code
securid_encrypt_track_data_2(krb5_context context, krb5_db_entry *client,
krb5_data *track_data, krb5_data *output)
{
krb5_error_code retval;
size_t olen;
krb5_keyblock sam_key;
krb5_enc_data tmp_enc_data;
output->data = NULL;
retval = get_securid_key(context,client, &sam_key);
if (retval != 0)
return retval;
retval = krb5_c_encrypt_length(context, sam_key.enctype,
track_data->length, &olen);
if (retval != 0)
goto cleanup;
assert(olen <= 65536);
output->length = olen;
output->data = k5alloc(output->length, &retval);
if (retval)
goto cleanup;
tmp_enc_data.ciphertext = *output;
tmp_enc_data.enctype = sam_key.enctype;
tmp_enc_data.kvno = 0;
retval = krb5_c_encrypt(context, &sam_key,
KRB5_KEYUSAGE_PA_SAM_CHALLENGE_TRACKID, 0,
track_data, &tmp_enc_data);
cleanup:
krb5_free_keyblock_contents(context, &sam_key);
if (retval) {
output->length = 0;
free(output->data);
output->data = NULL;
return retval;
}
return 0;
}
krb5_error_code
gss_krb5int_make_seal_token_v3 (krb5_context context,
krb5_gss_ctx_id_rec *ctx,
const gss_buffer_desc * message,
gss_buffer_t token,
int conf_req_flag, int toktype)
{
size_t bufsize = 16;
unsigned char *outbuf = 0;
krb5_error_code err;
int key_usage;
unsigned char acceptor_flag;
const gss_buffer_desc *message2 = message;
#ifdef CFX_EXERCISE
size_t rrc;
#endif
size_t ec;
unsigned short tok_id;
krb5_checksum sum;
krb5_keyblock *key;
ASSERT(toktype != KG_TOK_SEAL_MSG || ctx->enc != 0);
ASSERT(ctx->big_endian == 0);
acceptor_flag = ctx->initiate ? 0 : FLAG_SENDER_IS_ACCEPTOR;
key_usage = (toktype == KG_TOK_WRAP_MSG
? (ctx->initiate
? KG_USAGE_INITIATOR_SEAL
: KG_USAGE_ACCEPTOR_SEAL)
: (ctx->initiate
? KG_USAGE_INITIATOR_SIGN
: KG_USAGE_ACCEPTOR_SIGN));
if (ctx->have_acceptor_subkey) {
key = ctx->acceptor_subkey;
} else {
key = ctx->enc;
}
#ifdef _KERNEL
context->kef_cipher_mt = get_cipher_mech_type(context, key);
context->kef_hash_mt = get_hash_mech_type(context, key);
if ((err = init_key_kef(context->kef_cipher_mt, key))) {
return (GSS_S_FAILURE);
}
#endif /* _KERNEL */
#ifdef CFX_EXERCISE
{
static int initialized = 0;
if (!initialized) {
srand(time(0));
initialized = 1;
}
}
#endif
if (toktype == KG_TOK_WRAP_MSG && conf_req_flag) {
krb5_data plain;
krb5_enc_data cipher;
size_t ec_max;
size_t tlen;
/* 300: Adds some slop. */
if (SIZE_MAX - 300 < message->length)
return ENOMEM;
ec_max = SIZE_MAX - message->length - 300;
if (ec_max > 0xffff)
ec_max = 0xffff;
/*
* EC should really be a multiple (1) of the number of octets that
* the cryptosystem would pad by if we didn't have the filler.
*
* For AES-CTS this will always be 0 and we expect no further
* enctypes, so there should be no issue here.
*/
ec = 0;
plain.length = message->length + 16 + ec;
plain.data = MALLOC(plain.length);
if (plain.data == NULL)
return ENOMEM;
/* Get size of ciphertext. */
if ((err = krb5_c_encrypt_length(context,
ctx->enc->enctype, plain.length, &tlen))) {
FREE(plain.data, plain.length);
return (err);
}
bufsize = 16 + tlen;
/* Allocate space for header plus encrypted data. */
outbuf = MALLOC(bufsize);
if (outbuf == NULL) {
FREE(plain.data, plain.length);
return ENOMEM;
}
/* TOK_ID */
store_16_be(0x0504, outbuf);
/* flags */
outbuf[2] = (acceptor_flag
| (conf_req_flag ? FLAG_WRAP_CONFIDENTIAL : 0)
| (ctx->have_acceptor_subkey ? FLAG_ACCEPTOR_SUBKEY : 0));
/* filler */
outbuf[3] = 0xff;
/* EC */
store_16_be(ec, outbuf+4);
/* RRC */
store_16_be(0, outbuf+6);
store_64_be(ctx->seq_send, outbuf+8);
(void) memcpy(plain.data, message->value, message->length);
(void) memset(plain.data + message->length, 'x', ec);
(void) memcpy(plain.data + message->length + ec, outbuf, 16);
/* Should really use scatter/gather crypto interfaces */
cipher.ciphertext.data = (char *)outbuf + 16;
cipher.ciphertext.length = bufsize - 16;
cipher.enctype = key->enctype;
err = krb5_c_encrypt(context, key, key_usage, 0, &plain, &cipher);
(void) bzero(plain.data, plain.length);
FREE(plain.data, plain.length);
plain.data = 0;
if (err)
goto error;
/* Now that we know we're returning a valid token.... */
ctx->seq_send++;
#ifdef CFX_EXERCISE
rrc = rand() & 0xffff;
if (rotate_left(outbuf+16, bufsize-16,
(bufsize-16) - (rrc % (bufsize - 16))))
store_16_be(rrc, outbuf+6);
/* If the rotate fails, don't worry about it. */
#endif
} else if (toktype == KG_TOK_WRAP_MSG && !conf_req_flag) {
krb5_data plain;
/* Here, message is the application-supplied data; message2 is
what goes into the output token. They may be the same, or
message2 may be empty (for MIC). */
tok_id = 0x0504;
wrap_with_checksum:
plain.length = message->length + 16;
plain.data = MALLOC(message->length + 16);
if (plain.data == NULL)
return ENOMEM;
if (ctx->cksum_size > 0xffff) {
FREE(plain.data, plain.length);
return EINVAL;
}
bufsize = 16 + message2->length + ctx->cksum_size;
outbuf = MALLOC(bufsize);
if (outbuf == NULL) {
FREE(plain.data, plain.length);
plain.data = 0;
err = ENOMEM;
goto error;
}
/* TOK_ID */
store_16_be(tok_id, outbuf);
/* flags */
outbuf[2] = (acceptor_flag
| (ctx->have_acceptor_subkey ? FLAG_ACCEPTOR_SUBKEY : 0));
/* filler */
outbuf[3] = 0xff;
if (toktype == KG_TOK_WRAP_MSG) {
/* Use 0 for checksum calculation, substitute
checksum length later. */
/* EC */
store_16_be(0, outbuf+4);
/* RRC */
store_16_be(0, outbuf+6);
} else {
/* MIC and DEL store 0xFF in EC and RRC. */
store_16_be(0xffff, outbuf+4);
store_16_be(0xffff, outbuf+6);
}
store_64_be(ctx->seq_send, outbuf+8);
(void) memcpy(plain.data, message->value, message->length);
(void) memcpy(plain.data + message->length, outbuf, 16);
/* Fill in the output token -- data contents, if any, and
space for the checksum. */
if (message2->length)
(void) memcpy(outbuf + 16, message2->value, message2->length);
sum.contents = outbuf + 16 + message2->length;
sum.length = ctx->cksum_size;
err = krb5_c_make_checksum(context, ctx->cksumtype, key,
key_usage, &plain, &sum);
bzero(plain.data, plain.length);
FREE(plain.data, plain.length);
plain.data = 0;
if (err) {
bzero(outbuf,bufsize);
err = KRB5KRB_AP_ERR_BAD_INTEGRITY;
goto error;
}
if (sum.length != ctx->cksum_size) {
err = KRB5KRB_AP_ERR_BAD_INTEGRITY;
goto error;
}
(void) memcpy(outbuf + 16 + message2->length, sum.contents,
ctx->cksum_size);
krb5_free_checksum_contents(context, &sum);
sum.contents = 0;
/* Now that we know we're actually generating the token... */
ctx->seq_send++;
if (toktype == KG_TOK_WRAP_MSG) {
#ifdef CFX_EXERCISE
rrc = rand() & 0xffff;
/* If the rotate fails, don't worry about it. */
if (rotate_left(outbuf+16, bufsize-16,
(bufsize-16) - (rrc % (bufsize - 16))))
store_16_be(rrc, outbuf+6);
#endif
/* Fix up EC field. */
store_16_be(ctx->cksum_size, outbuf+4);
} else {
store_16_be(0xffff, outbuf+6);
}
} else if (toktype == KG_TOK_MIC_MSG) {
tok_id = 0x0404;
message2 = &empty_message;
goto wrap_with_checksum;
} else if (toktype == KG_TOK_DEL_CTX) {
/*
* Solaris Kerberos:
* No token should be generated for context deletion. Just
* return.
*/
return 0;
} else {
err = KRB5KRB_AP_ERR_BAD_INTEGRITY;
goto error;
}
token->value = outbuf;
token->length = bufsize;
return 0;
error:
FREE(outbuf, bufsize);
token->value = NULL;
token->length = 0;
return err;
}
/*
* Generate a krb5_key_data set by encrypting keys according to
* enctype/salttype preferences
*/
krb5_error_code ipa_krb5_generate_key_data(krb5_context krbctx,
krb5_principal principal,
krb5_data pwd, int kvno,
krb5_keyblock *kmkey,
int num_encsalts,
krb5_key_salt_tuple *encsalts,
int *_num_keys,
krb5_key_data **_keys)
{
krb5_error_code kerr;
krb5_key_data *keys;
int num_keys;
int i;
num_keys = num_encsalts;
keys = calloc(num_keys, sizeof(krb5_key_data));
if (!keys) {
return ENOMEM;
}
for (i = 0; i < num_keys; i++) {
krb5_keyblock key;
krb5_data salt;
krb5_octet *ptr;
krb5_data plain;
krb5_enc_data cipher;
krb5_int16 t;
size_t len;
salt.data = NULL;
keys[i].key_data_ver = 2; /* we always have a salt */
keys[i].key_data_kvno = kvno;
switch (encsalts[i].ks_salttype) {
case KRB5_KDB_SALTTYPE_ONLYREALM:
if (!principal->realm.data) {
kerr = EINVAL;
goto done;
}
salt.length = principal->realm.length;
salt.data = malloc(salt.length);
if (!salt.data) {
kerr = ENOMEM;
goto done;
}
memcpy(salt.data, principal->realm.data, salt.length);
break;
case KRB5_KDB_SALTTYPE_NOREALM:
kerr = ipa_krb5_principal2salt_norealm(krbctx, principal, &salt);
if (kerr) {
goto done;
}
break;
case KRB5_KDB_SALTTYPE_NORMAL:
kerr = krb5_principal2salt(krbctx, principal, &salt);
if (kerr) {
goto done;
}
break;
case KRB5_KDB_SALTTYPE_SPECIAL:
kerr = ipa_get_random_salt(krbctx, &salt);
if (kerr) {
goto done;
}
break;
case KRB5_KDB_SALTTYPE_V4:
salt.length = 0;
break;
case KRB5_KDB_SALTTYPE_AFS3:
if (!principal->realm.data) {
kerr = EINVAL;
goto done;
}
salt.data = strndup((char *)principal->realm.data,
principal->realm.length);
if (!salt.data) {
kerr = ENOMEM;
goto done;
}
salt.length = SALT_TYPE_AFS_LENGTH; /* special value */
break;
default:
kerr = EINVAL;
goto done;
}
/* need to build the key now to manage the AFS salt.length
* special case */
kerr = krb5_c_string_to_key(krbctx,
encsalts[i].ks_enctype,
&pwd, &salt, &key);
if (kerr) {
krb5_free_data_contents(krbctx, &salt);
goto done;
}
if (salt.length == SALT_TYPE_AFS_LENGTH) {
salt.length = strlen(salt.data);
}
kerr = krb5_c_encrypt_length(krbctx,
kmkey->enctype, key.length, &len);
if (kerr) {
krb5int_c_free_keyblock_contents(krbctx, &key);
krb5_free_data_contents(krbctx, &salt);
goto done;
}
if ((ptr = (krb5_octet *) malloc(2 + len)) == NULL) {
kerr = ENOMEM;
krb5int_c_free_keyblock_contents(krbctx, &key);
krb5_free_data_contents(krbctx, &salt);
goto done;
}
t = htole16(key.length);
memcpy(ptr, &t, 2);
plain.length = key.length;
plain.data = (char *)key.contents;
cipher.ciphertext.length = len;
cipher.ciphertext.data = (char *)ptr+2;
kerr = krb5_c_encrypt(krbctx, kmkey, 0, 0, &plain, &cipher);
if (kerr) {
krb5int_c_free_keyblock_contents(krbctx, &key);
krb5_free_data_contents(krbctx, &salt);
free(ptr);
goto done;
}
/* KrbSalt */
keys[i].key_data_type[1] = encsalts[i].ks_salttype;
if (salt.length) {
keys[i].key_data_length[1] = salt.length;
keys[i].key_data_contents[1] = (krb5_octet *)salt.data;
}
/* EncryptionKey */
keys[i].key_data_type[0] = key.enctype;
keys[i].key_data_length[0] = len + 2;
keys[i].key_data_contents[0] = malloc(len + 2);
if (!keys[i].key_data_contents[0]) {
kerr = ENOMEM;
krb5int_c_free_keyblock_contents(krbctx, &key);
free(ptr);
goto done;
}
memcpy(keys[i].key_data_contents[0], ptr, len + 2);
/* make sure we free the memory used now that we are done with it */
krb5int_c_free_keyblock_contents(krbctx, &key);
free(ptr);
}
*_num_keys = num_keys;
*_keys = keys;
kerr = 0;
done:
if (kerr) {
ipa_krb5_free_key_data(keys, num_keys);
}
return kerr;
}
static krb5_error_code
sam2_process(krb5_context context, krb5_clpreauth_moddata moddata,
krb5_clpreauth_modreq modreq, krb5_get_init_creds_opt *opt,
krb5_clpreauth_callbacks cb, krb5_clpreauth_rock rock,
krb5_kdc_req *request, krb5_data *encoded_request_body,
krb5_data *encoded_previous_request, krb5_pa_data *padata,
krb5_prompter_fct prompter, void *prompter_data,
krb5_pa_data ***out_padata)
{
krb5_error_code retval;
krb5_sam_challenge_2 *sc2 = NULL;
krb5_sam_challenge_2_body *sc2b = NULL;
krb5_data tmp_data;
krb5_data response_data;
char name[100], banner[100], prompt[100], response[100];
krb5_prompt kprompt;
krb5_prompt_type prompt_type;
krb5_data defsalt, *salt;
krb5_checksum **cksum;
krb5_data *scratch = NULL;
krb5_boolean valid_cksum = 0;
krb5_enc_sam_response_enc_2 enc_sam_response_enc_2;
krb5_sam_response_2 sr2;
size_t ciph_len;
krb5_pa_data **sam_padata;
if (prompter == NULL)
return KRB5_LIBOS_CANTREADPWD;
tmp_data.length = padata->length;
tmp_data.data = (char *)padata->contents;
if ((retval = decode_krb5_sam_challenge_2(&tmp_data, &sc2)))
return(retval);
retval = decode_krb5_sam_challenge_2_body(&sc2->sam_challenge_2_body, &sc2b);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
return(retval);
}
if (!sc2->sam_cksum || ! *sc2->sam_cksum) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
return(KRB5_SAM_NO_CHECKSUM);
}
if (sc2b->sam_flags & KRB5_SAM_MUST_PK_ENCRYPT_SAD) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
return(KRB5_SAM_UNSUPPORTED);
}
if (!krb5_c_valid_enctype(sc2b->sam_etype)) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
return(KRB5_SAM_INVALID_ETYPE);
}
/* All of the above error checks are KDC-specific, that is, they */
/* assume a failure in the KDC reply. By returning anything other */
/* than KRB5_KDC_UNREACH, KRB5_PREAUTH_FAILED, */
/* KRB5_LIBOS_PWDINTR, or KRB5_REALM_CANT_RESOLVE, the client will */
/* most likely go on to try the AS_REQ against master KDC */
if (!(sc2b->sam_flags & KRB5_SAM_USE_SAD_AS_KEY)) {
/* We will need the password to obtain the key used for */
/* the checksum, and encryption of the sam_response. */
/* Go ahead and get it now, preserving the ordering of */
/* prompts for the user. */
retval = (*rock->gak_fct)(context, request->client, sc2b->sam_etype,
prompter, prompter_data, rock->salt,
rock->s2kparams, rock->as_key,
*rock->gak_data);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
return(retval);
}
}
snprintf(name, sizeof(name), "%.*s",
SAMDATA(sc2b->sam_type_name, _("SAM Authentication"),
sizeof(name) - 1));
snprintf(banner, sizeof(banner), "%.*s",
SAMDATA(sc2b->sam_challenge_label,
sam_challenge_banner(sc2b->sam_type),
sizeof(banner)-1));
snprintf(prompt, sizeof(prompt), "%s%.*s%s%.*s",
sc2b->sam_challenge.length?"Challenge is [":"",
SAMDATA(sc2b->sam_challenge, "", 20),
sc2b->sam_challenge.length?"], ":"",
SAMDATA(sc2b->sam_response_prompt, "passcode", 55));
response_data.data = response;
response_data.length = sizeof(response);
kprompt.prompt = prompt;
kprompt.hidden = 1;
kprompt.reply = &response_data;
prompt_type = KRB5_PROMPT_TYPE_PREAUTH;
krb5int_set_prompt_types(context, &prompt_type);
if ((retval = ((*prompter)(context, prompter_data, name,
banner, 1, &kprompt)))) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
krb5int_set_prompt_types(context, 0);
return(retval);
}
krb5int_set_prompt_types(context, (krb5_prompt_type *)NULL);
/* Generate salt used by string_to_key() */
salt = rock->salt;
if (((int) salt->length == -1) && (salt->data == NULL)) {
if ((retval =
krb5_principal2salt(context, request->client, &defsalt))) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
return(retval);
}
salt = &defsalt;
} else {
defsalt.length = 0;
}
/* Get encryption key to be used for checksum and sam_response */
if (!(sc2b->sam_flags & KRB5_SAM_USE_SAD_AS_KEY)) {
/* as_key = string_to_key(password) */
if (rock->as_key->length) {
krb5_free_keyblock_contents(context, rock->as_key);
rock->as_key->length = 0;
}
/* generate a key using the supplied password */
retval = krb5_c_string_to_key(context, sc2b->sam_etype,
(krb5_data *)*rock->gak_data, salt,
rock->as_key);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
if (defsalt.length) free(defsalt.data);
return(retval);
}
if (!(sc2b->sam_flags & KRB5_SAM_SEND_ENCRYPTED_SAD)) {
/* as_key = combine_key (as_key, string_to_key(SAD)) */
krb5_keyblock tmp_kb;
retval = krb5_c_string_to_key(context, sc2b->sam_etype,
&response_data, salt, &tmp_kb);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
if (defsalt.length) free(defsalt.data);
return(retval);
}
/* This should be a call to the crypto library some day */
/* key types should already match the sam_etype */
retval = krb5int_c_combine_keys(context, rock->as_key, &tmp_kb,
rock->as_key);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
if (defsalt.length) free(defsalt.data);
return(retval);
}
krb5_free_keyblock_contents(context, &tmp_kb);
}
if (defsalt.length)
free(defsalt.data);
} else {
/* as_key = string_to_key(SAD) */
if (rock->as_key->length) {
krb5_free_keyblock_contents(context, rock->as_key);
rock->as_key->length = 0;
}
/* generate a key using the supplied password */
retval = krb5_c_string_to_key(context, sc2b->sam_etype,
&response_data, salt, rock->as_key);
if (defsalt.length)
free(defsalt.data);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
return(retval);
}
}
/* Now we have a key, verify the checksum on the sam_challenge */
cksum = sc2->sam_cksum;
for (; *cksum; cksum++) {
if (!krb5_c_is_keyed_cksum((*cksum)->checksum_type))
continue;
/* Check this cksum */
retval = krb5_c_verify_checksum(context, rock->as_key,
KRB5_KEYUSAGE_PA_SAM_CHALLENGE_CKSUM,
&sc2->sam_challenge_2_body,
*cksum, &valid_cksum);
if (retval) {
krb5_free_data(context, scratch);
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
return(retval);
}
if (valid_cksum)
break;
}
if (!valid_cksum) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
/*
* Note: We return AP_ERR_BAD_INTEGRITY so upper-level applications
* can interpret that as "password incorrect", which is probably
* the best error we can return in this situation.
*/
return(KRB5KRB_AP_ERR_BAD_INTEGRITY);
}
/* fill in enc_sam_response_enc_2 */
enc_sam_response_enc_2.magic = KV5M_ENC_SAM_RESPONSE_ENC_2;
enc_sam_response_enc_2.sam_nonce = sc2b->sam_nonce;
if (sc2b->sam_flags & KRB5_SAM_SEND_ENCRYPTED_SAD) {
enc_sam_response_enc_2.sam_sad = response_data;
} else {
enc_sam_response_enc_2.sam_sad.data = NULL;
enc_sam_response_enc_2.sam_sad.length = 0;
}
/* encode and encrypt enc_sam_response_enc_2 with as_key */
retval = encode_krb5_enc_sam_response_enc_2(&enc_sam_response_enc_2,
&scratch);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
return(retval);
}
/* Fill in sam_response_2 */
memset(&sr2, 0, sizeof(sr2));
sr2.sam_type = sc2b->sam_type;
sr2.sam_flags = sc2b->sam_flags;
sr2.sam_track_id = sc2b->sam_track_id;
sr2.sam_nonce = sc2b->sam_nonce;
/* Now take care of sr2.sam_enc_nonce_or_sad by encrypting encoded */
/* enc_sam_response_enc_2 from above */
retval = krb5_c_encrypt_length(context, rock->as_key->enctype,
scratch->length, &ciph_len);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
krb5_free_data(context, scratch);
return(retval);
}
sr2.sam_enc_nonce_or_sad.ciphertext.length = ciph_len;
sr2.sam_enc_nonce_or_sad.ciphertext.data =
(char *)malloc(sr2.sam_enc_nonce_or_sad.ciphertext.length);
if (!sr2.sam_enc_nonce_or_sad.ciphertext.data) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
krb5_free_data(context, scratch);
return(ENOMEM);
}
retval = krb5_c_encrypt(context, rock->as_key,
KRB5_KEYUSAGE_PA_SAM_RESPONSE, NULL, scratch,
&sr2.sam_enc_nonce_or_sad);
if (retval) {
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
krb5_free_data(context, scratch);
krb5_free_data_contents(context, &sr2.sam_enc_nonce_or_sad.ciphertext);
return(retval);
}
krb5_free_data(context, scratch);
scratch = NULL;
/* Encode the sam_response_2 */
retval = encode_krb5_sam_response_2(&sr2, &scratch);
krb5_free_sam_challenge_2(context, sc2);
krb5_free_sam_challenge_2_body(context, sc2b);
krb5_free_data_contents(context, &sr2.sam_enc_nonce_or_sad.ciphertext);
if (retval) {
return (retval);
}
/* Almost there, just need to make padata ! */
sam_padata = malloc(2 * sizeof(*sam_padata));
if (sam_padata == NULL) {
krb5_free_data(context, scratch);
return(ENOMEM);
}
sam_padata[0] = malloc(sizeof(krb5_pa_data));
if (sam_padata[0] == NULL) {
krb5_free_data(context, scratch);
free(sam_padata);
return(ENOMEM);
}
sam_padata[0]->magic = KV5M_PA_DATA;
sam_padata[0]->pa_type = KRB5_PADATA_SAM_RESPONSE_2;
sam_padata[0]->length = scratch->length;
sam_padata[0]->contents = (krb5_octet *) scratch->data;
free(scratch);
sam_padata[1] = NULL;
*out_padata = sam_padata;
return(0);
}
krb5_error_code
gss_krb5int_make_seal_token_v3 (krb5_context context,
krb5_gss_ctx_id_rec *ctx,
const gss_buffer_desc * message,
gss_buffer_t token,
int conf_req_flag, int toktype)
{
size_t bufsize = 16;
unsigned char *outbuf = 0;
krb5_error_code err;
int key_usage;
unsigned char acceptor_flag;
const gss_buffer_desc *message2 = message;
#ifdef CFX_EXERCISE
size_t rrc;
#endif
size_t ec;
unsigned short tok_id;
krb5_checksum sum;
krb5_keyblock *key;
krb5_cksumtype cksumtype;
assert(ctx->big_endian == 0);
acceptor_flag = ctx->initiate ? 0 : FLAG_SENDER_IS_ACCEPTOR;
key_usage = (toktype == KG_TOK_WRAP_MSG
? (ctx->initiate
? KG_USAGE_INITIATOR_SEAL
: KG_USAGE_ACCEPTOR_SEAL)
: (ctx->initiate
? KG_USAGE_INITIATOR_SIGN
: KG_USAGE_ACCEPTOR_SIGN));
if (ctx->have_acceptor_subkey) {
key = ctx->acceptor_subkey;
cksumtype = ctx->acceptor_subkey_cksumtype;
} else {
key = ctx->subkey;
cksumtype = ctx->cksumtype;
}
assert(key != NULL);
#ifdef CFX_EXERCISE
{
static int initialized = 0;
if (!initialized) {
srand(time(0));
initialized = 1;
}
}
#endif
if (toktype == KG_TOK_WRAP_MSG && conf_req_flag) {
krb5_data plain;
krb5_enc_data cipher;
size_t ec_max;
/* 300: Adds some slop. */
if (SIZE_MAX - 300 < message->length)
return ENOMEM;
ec_max = SIZE_MAX - message->length - 300;
if (ec_max > 0xffff)
ec_max = 0xffff;
#ifdef CFX_EXERCISE
/* For testing only. For performance, always set ec = 0. */
ec = ec_max & rand();
#else
ec = 0;
#endif
plain.length = message->length + 16 + ec;
plain.data = malloc(message->length + 16 + ec);
if (plain.data == NULL)
return ENOMEM;
/* Get size of ciphertext. */
bufsize = 16 + krb5_encrypt_size (plain.length, key->enctype);
/* Allocate space for header plus encrypted data. */
outbuf = malloc(bufsize);
if (outbuf == NULL) {
free(plain.data);
return ENOMEM;
}
/* TOK_ID */
store_16_be(KG2_TOK_WRAP_MSG, outbuf);
/* flags */
outbuf[2] = (acceptor_flag
| (conf_req_flag ? FLAG_WRAP_CONFIDENTIAL : 0)
| (ctx->have_acceptor_subkey ? FLAG_ACCEPTOR_SUBKEY : 0));
/* filler */
outbuf[3] = 0xff;
/* EC */
store_16_be(ec, outbuf+4);
/* RRC */
store_16_be(0, outbuf+6);
store_64_be(ctx->seq_send, outbuf+8);
memcpy(plain.data, message->value, message->length);
memset(plain.data + message->length, 'x', ec);
memcpy(plain.data + message->length + ec, outbuf, 16);
cipher.ciphertext.data = (char *)outbuf + 16;
cipher.ciphertext.length = bufsize - 16;
cipher.enctype = key->enctype;
err = krb5_c_encrypt(context, key, key_usage, 0, &plain, &cipher);
zap(plain.data, plain.length);
free(plain.data);
plain.data = 0;
if (err)
goto error;
/* Now that we know we're returning a valid token.... */
ctx->seq_send++;
#ifdef CFX_EXERCISE
rrc = rand() & 0xffff;
if (gss_krb5int_rotate_left(outbuf+16, bufsize-16,
(bufsize-16) - (rrc % (bufsize - 16))))
store_16_be(rrc, outbuf+6);
/* If the rotate fails, don't worry about it. */
#endif
} else if (toktype == KG_TOK_WRAP_MSG && !conf_req_flag) {
krb5_data plain;
size_t cksumsize;
/* Here, message is the application-supplied data; message2 is
what goes into the output token. They may be the same, or
message2 may be empty (for MIC). */
tok_id = KG2_TOK_WRAP_MSG;
wrap_with_checksum:
plain.length = message->length + 16;
plain.data = malloc(message->length + 16);
if (plain.data == NULL)
return ENOMEM;
err = krb5_c_checksum_length(context, cksumtype, &cksumsize);
if (err)
goto error;
assert(cksumsize <= 0xffff);
bufsize = 16 + message2->length + cksumsize;
outbuf = malloc(bufsize);
if (outbuf == NULL) {
free(plain.data);
plain.data = 0;
err = ENOMEM;
goto error;
}
/* TOK_ID */
store_16_be(tok_id, outbuf);
/* flags */
outbuf[2] = (acceptor_flag
| (ctx->have_acceptor_subkey ? FLAG_ACCEPTOR_SUBKEY : 0));
/* filler */
outbuf[3] = 0xff;
if (toktype == KG_TOK_WRAP_MSG) {
/* Use 0 for checksum calculation, substitute
checksum length later. */
/* EC */
store_16_be(0, outbuf+4);
/* RRC */
store_16_be(0, outbuf+6);
} else {
/* MIC and DEL store 0xFF in EC and RRC. */
store_16_be(0xffff, outbuf+4);
store_16_be(0xffff, outbuf+6);
}
store_64_be(ctx->seq_send, outbuf+8);
memcpy(plain.data, message->value, message->length);
memcpy(plain.data + message->length, outbuf, 16);
/* Fill in the output token -- data contents, if any, and
space for the checksum. */
if (message2->length)
memcpy(outbuf + 16, message2->value, message2->length);
sum.contents = outbuf + 16 + message2->length;
sum.length = cksumsize;
err = krb5_c_make_checksum(context, cksumtype, key,
key_usage, &plain, &sum);
zap(plain.data, plain.length);
free(plain.data);
plain.data = 0;
if (err) {
zap(outbuf,bufsize);
goto error;
}
if (sum.length != cksumsize)
abort();
memcpy(outbuf + 16 + message2->length, sum.contents, cksumsize);
krb5_free_checksum_contents(context, &sum);
sum.contents = 0;
/* Now that we know we're actually generating the token... */
ctx->seq_send++;
if (toktype == KG_TOK_WRAP_MSG) {
#ifdef CFX_EXERCISE
rrc = rand() & 0xffff;
/* If the rotate fails, don't worry about it. */
if (gss_krb5int_rotate_left(outbuf+16, bufsize-16,
(bufsize-16) - (rrc % (bufsize - 16))))
store_16_be(rrc, outbuf+6);
#endif
/* Fix up EC field. */
store_16_be(cksumsize, outbuf+4);
} else {
store_16_be(0xffff, outbuf+6);
}
} else if (toktype == KG_TOK_MIC_MSG) {
tok_id = KG2_TOK_MIC_MSG;
message2 = &empty_message;
goto wrap_with_checksum;
} else if (toktype == KG_TOK_DEL_CTX) {
tok_id = KG2_TOK_DEL_CTX;
message = message2 = &empty_message;
goto wrap_with_checksum;
} else
abort();
token->value = outbuf;
token->length = bufsize;
return 0;
error:
free(outbuf);
token->value = NULL;
token->length = 0;
return err;
}
int
main ()
{
krb5_context context = 0;
krb5_data in, in2, out, out2, check, check2, state, signdata;
krb5_crypto_iov iov[5];
int i, j, pos;
unsigned int dummy;
size_t len;
krb5_enc_data enc_out, enc_out2;
krb5_keyblock *keyblock;
krb5_key key;
memset(iov, 0, sizeof(iov));
in.data = "This is a test.\n";
in.length = strlen (in.data);
in2.data = "This is another test.\n";
in2.length = strlen (in2.data);
test ("Seeding random number generator",
krb5_c_random_seed (context, &in));
/* Set up output buffers. */
out.data = malloc(2048);
out2.data = malloc(2048);
check.data = malloc(2048);
check2.data = malloc(2048);
if (out.data == NULL || out2.data == NULL
|| check.data == NULL || check2.data == NULL)
abort();
out.magic = KV5M_DATA;
out.length = 2048;
out2.magic = KV5M_DATA;
out2.length = 2048;
check.length = 2048;
check2.length = 2048;
for (i = 0; interesting_enctypes[i]; i++) {
krb5_enctype enctype = interesting_enctypes [i];
printf ("Testing enctype %d\n", enctype);
test ("Initializing a keyblock",
krb5_init_keyblock (context, enctype, 0, &keyblock));
test ("Generating random keyblock",
krb5_c_make_random_key (context, enctype, keyblock));
test ("Creating opaque key from keyblock",
krb5_k_create_key (context, keyblock, &key));
enc_out.ciphertext = out;
enc_out2.ciphertext = out2;
/* We use an intermediate `len' because size_t may be different size
than `int' */
krb5_c_encrypt_length (context, keyblock->enctype, in.length, &len);
enc_out.ciphertext.length = len;
/* Encrypt, decrypt, and see if we got the plaintext back again. */
test ("Encrypting (c)",
krb5_c_encrypt (context, keyblock, 7, 0, &in, &enc_out));
display ("Enc output", &enc_out.ciphertext);
test ("Decrypting",
krb5_c_decrypt (context, keyblock, 7, 0, &enc_out, &check));
test ("Comparing", compare_results (&in, &check));
/* Try again with the opaque-key-using variants. */
memset(out.data, 0, out.length);
test ("Encrypting (k)",
krb5_k_encrypt (context, key, 7, 0, &in, &enc_out));
display ("Enc output", &enc_out.ciphertext);
test ("Decrypting",
krb5_k_decrypt (context, key, 7, 0, &enc_out, &check));
test ("Comparing", compare_results (&in, &check));
/* Check if this enctype supports IOV encryption. */
if ( krb5_c_crypto_length(context, keyblock->enctype,
KRB5_CRYPTO_TYPE_HEADER, &dummy) == 0 ){
/* Set up iovecs for stream decryption. */
memcpy(out2.data, enc_out.ciphertext.data, enc_out.ciphertext.length);
iov[0].flags= KRB5_CRYPTO_TYPE_STREAM;
iov[0].data.data = out2.data;
iov[0].data.length = enc_out.ciphertext.length;
iov[1].flags = KRB5_CRYPTO_TYPE_DATA;
/* Decrypt the encrypted data from above and check it. */
test("IOV stream decrypting (c)",
krb5_c_decrypt_iov( context, keyblock, 7, 0, iov, 2));
test("Comparing results",
compare_results(&in, &iov[1].data));
/* Try again with the opaque-key-using variant. */
memcpy(out2.data, enc_out.ciphertext.data, enc_out.ciphertext.length);
test("IOV stream decrypting (k)",
krb5_k_decrypt_iov( context, key, 7, 0, iov, 2));
test("Comparing results",
compare_results(&in, &iov[1].data));
/* Set up iovecs for AEAD encryption. */
signdata.magic = KV5M_DATA;
signdata.data = (char *) "This should be signed";
signdata.length = strlen(signdata.data);
iov[0].flags = KRB5_CRYPTO_TYPE_HEADER;
iov[1].flags = KRB5_CRYPTO_TYPE_DATA;
iov[1].data = in; /*We'll need to copy memory before encrypt*/
iov[2].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY;
iov[2].data = signdata;
iov[3].flags = KRB5_CRYPTO_TYPE_PADDING;
iov[4].flags = KRB5_CRYPTO_TYPE_TRAILER;
/* "Allocate" data for the iovec buffers from the "out" buffer. */
test("Setting up iov lengths",
krb5_c_crypto_length_iov(context, keyblock->enctype, iov, 5));
for (j=0,pos=0; j <= 4; j++ ){
if (iov[j].flags == KRB5_CRYPTO_TYPE_SIGN_ONLY)
continue;
iov[j].data.data = &out.data[pos];
pos += iov[j].data.length;
}
assert (iov[1].data.length == in.length);
memcpy(iov[1].data.data, in.data, in.length);
/* Encrypt and decrypt in place, and check the result. */
test("iov encrypting (c)",
krb5_c_encrypt_iov(context, keyblock, 7, 0, iov, 5));
assert(iov[1].data.length == in.length);
display("Header", &iov[0].data);
display("Data", &iov[1].data);
display("Padding", &iov[3].data);
display("Trailer", &iov[4].data);
test("iov decrypting",
krb5_c_decrypt_iov(context, keyblock, 7, 0, iov, 5));
test("Comparing results",
compare_results(&in, &iov[1].data));
/* Try again with opaque-key-using variants. */
test("iov encrypting (k)",
krb5_k_encrypt_iov(context, key, 7, 0, iov, 5));
assert(iov[1].data.length == in.length);
display("Header", &iov[0].data);
display("Data", &iov[1].data);
display("Padding", &iov[3].data);
display("Trailer", &iov[4].data);
test("iov decrypting",
krb5_k_decrypt_iov(context, key, 7, 0, iov, 5));
test("Comparing results",
compare_results(&in, &iov[1].data));
}
enc_out.ciphertext.length = out.length;
check.length = 2048;
test ("init_state",
krb5_c_init_state (context, keyblock, 7, &state));
test ("Encrypting with state",
krb5_c_encrypt (context, keyblock, 7, &state, &in, &enc_out));
display ("Enc output", &enc_out.ciphertext);
test ("Encrypting again with state",
krb5_c_encrypt (context, keyblock, 7, &state, &in2, &enc_out2));
display ("Enc output", &enc_out2.ciphertext);
test ("free_state",
krb5_c_free_state (context, keyblock, &state));
test ("init_state",
krb5_c_init_state (context, keyblock, 7, &state));
test ("Decrypting with state",
krb5_c_decrypt (context, keyblock, 7, &state, &enc_out, &check));
test ("Decrypting again with state",
krb5_c_decrypt (context, keyblock, 7, &state, &enc_out2, &check2));
test ("free_state",
krb5_c_free_state (context, keyblock, &state));
test ("Comparing",
compare_results (&in, &check));
test ("Comparing",
compare_results (&in2, &check2));
krb5_free_keyblock (context, keyblock);
krb5_k_free_key (context, key);
}
/* Test the RC4 decrypt fallback from key usage 9 to 8. */
test ("Initializing an RC4 keyblock",
krb5_init_keyblock (context, ENCTYPE_ARCFOUR_HMAC, 0, &keyblock));
test ("Generating random RC4 key",
krb5_c_make_random_key (context, ENCTYPE_ARCFOUR_HMAC, keyblock));
enc_out.ciphertext = out;
krb5_c_encrypt_length (context, keyblock->enctype, in.length, &len);
enc_out.ciphertext.length = len;
check.length = 2048;
test ("Encrypting with RC4 key usage 8",
krb5_c_encrypt (context, keyblock, 8, 0, &in, &enc_out));
display ("Enc output", &enc_out.ciphertext);
test ("Decrypting with RC4 key usage 9",
krb5_c_decrypt (context, keyblock, 9, 0, &enc_out, &check));
test ("Comparing", compare_results (&in, &check));
krb5_free_keyblock (context, keyblock);
free(out.data);
free(out2.data);
free(check.data);
free(check2.data);
return 0;
}
/* Construct a cookie pa-data item using the cookie values from state, or a
* trivial "MIT" cookie if no values are set. */
krb5_error_code
kdc_fast_make_cookie(krb5_context context, struct kdc_request_state *state,
krb5_db_entry *local_tgt,
krb5_const_principal client_princ,
krb5_pa_data **cookie_out)
{
krb5_error_code ret;
krb5_secure_cookie cookie;
krb5_pa_data **contents = state->out_cookie_padata, *pa;
krb5_keyblock *key = NULL;
krb5_timestamp now;
krb5_enc_data enc;
krb5_data *der_cookie = NULL;
krb5_kvno kvno;
size_t ctlen;
*cookie_out = NULL;
memset(&enc, 0, sizeof(enc));
/* Make a trivial cookie if there are no contents to marshal or we don't
* have a TGT entry to encrypt them. */
if (contents == NULL || *contents == NULL || local_tgt == NULL)
return make_padata(KRB5_PADATA_FX_COOKIE, "MIT", 3, cookie_out);
ret = get_cookie_key(context, local_tgt, 0, client_princ, &key, &kvno);
if (ret)
goto cleanup;
/* Encode the cookie. */
ret = krb5_timeofday(context, &now);
if (ret)
goto cleanup;
cookie.time = now;
cookie.data = contents;
ret = encode_krb5_secure_cookie(&cookie, &der_cookie);
if (ret)
goto cleanup;
/* Encrypt the cookie in key. */
ret = krb5_c_encrypt_length(context, key->enctype, der_cookie->length,
&ctlen);
if (ret)
goto cleanup;
ret = alloc_data(&enc.ciphertext, ctlen);
if (ret)
goto cleanup;
ret = krb5_c_encrypt(context, key, KRB5_KEYUSAGE_PA_FX_COOKIE, NULL,
der_cookie, &enc);
if (ret)
goto cleanup;
/* Construct the cookie pa-data entry. */
ret = alloc_padata(KRB5_PADATA_FX_COOKIE, 8 + enc.ciphertext.length, &pa);
memcpy(pa->contents, "MIT1", 4);
store_32_be(kvno, pa->contents + 4);
memcpy(pa->contents + 8, enc.ciphertext.data, enc.ciphertext.length);
*cookie_out = pa;
cleanup:
krb5_free_keyblock(context, key);
if (der_cookie != NULL) {
zapfree(der_cookie->data, der_cookie->length);
free(der_cookie);
}
krb5_free_data_contents(context, &enc.ciphertext);
return ret;
}
/*ARGSUSED*/
static krb5_error_code
krb5_mk_priv_basic(krb5_context context, const krb5_data *userdata, const krb5_keyblock *keyblock, krb5_replay_data *replaydata, krb5_address *local_addr, krb5_address *remote_addr, krb5_pointer i_vector, krb5_data *outbuf)
{
krb5_error_code retval;
krb5_priv privmsg;
krb5_priv_enc_part privmsg_enc_part;
krb5_data *scratch1, *scratch2, ivdata;
size_t blocksize, enclen;
privmsg.enc_part.kvno = 0; /* XXX allow user-set? */
privmsg.enc_part.enctype = keyblock->enctype;
privmsg_enc_part.user_data = *userdata;
privmsg_enc_part.s_address = local_addr;
privmsg_enc_part.r_address = remote_addr;
/* We should check too make sure one exists. */
privmsg_enc_part.timestamp = replaydata->timestamp;
privmsg_enc_part.usec = replaydata->usec;
privmsg_enc_part.seq_number = replaydata->seq;
/* start by encoding to-be-encrypted part of the message */
if ((retval = encode_krb5_enc_priv_part(&privmsg_enc_part, &scratch1)))
return retval;
/* put together an eblock for this encryption */
if ((retval = krb5_c_encrypt_length(context, keyblock->enctype,
scratch1->length, &enclen)))
goto clean_scratch;
privmsg.enc_part.ciphertext.length = enclen;
if (!(privmsg.enc_part.ciphertext.data =
malloc(privmsg.enc_part.ciphertext.length))) {
retval = ENOMEM;
goto clean_scratch;
}
/* call the encryption routine */
if (i_vector) {
if ((retval = krb5_c_block_size(context, keyblock->enctype,
&blocksize)))
goto clean_encpart;
ivdata.length = blocksize;
ivdata.data = i_vector;
}
if ((retval = krb5_c_encrypt(context, keyblock,
KRB5_KEYUSAGE_KRB_PRIV_ENCPART,
i_vector?&ivdata:0,
scratch1, &privmsg.enc_part)))
goto clean_encpart;
if ((retval = encode_krb5_priv(&privmsg, &scratch2)))
goto clean_encpart;
*outbuf = *scratch2;
krb5_xfree(scratch2);
retval = 0;
clean_encpart:
memset(privmsg.enc_part.ciphertext.data, 0,
privmsg.enc_part.ciphertext.length);
free(privmsg.enc_part.ciphertext.data);
privmsg.enc_part.ciphertext.length = 0;
privmsg.enc_part.ciphertext.data = 0;
clean_scratch:
memset(scratch1->data, 0, scratch1->length);
krb5_free_data(context, scratch1);
return retval;
}
int Condor_Auth_Kerberos :: wrap(char* input,
int input_len,
char*& output,
int& output_len)
{
krb5_error_code code;
krb5_data in_data;
krb5_enc_data out_data;
int index, tmp;
size_t blocksize, encrypted_length;
char* encrypted_data = 0;
// make a blank initialization vector
code = krb5_c_block_size(krb_context_, sessionKey_->enctype, &blocksize);
if (code) {
// err
}
// Make the input buffer
in_data.data = input;
in_data.length = input_len;
// Make the output buffer
code = krb5_c_encrypt_length(krb_context_, sessionKey_->enctype, input_len, &encrypted_length);
if(code) {
// err
}
encrypted_data = (char*)malloc(encrypted_length);
if (!encrypted_length) {
// err
}
out_data.ciphertext.data = (char*)encrypted_data;
out_data.ciphertext.length = encrypted_length;
if ((code = krb5_c_encrypt(krb_context_, sessionKey_, 1024, /* key usage */
0, &in_data, &out_data)) != 0) { /* 0 = no ivec */
output = 0;
output_len = 0;
if (out_data.ciphertext.data) {
free(out_data.ciphertext.data);
}
dprintf( D_ALWAYS, "KERBEROS: %s\n", error_message(code) );
return false;
}
output_len = sizeof(out_data.enctype) +
sizeof(out_data.kvno) +
sizeof(out_data.ciphertext.length) +
out_data.ciphertext.length;
output = (char *) malloc(output_len);
index = 0;
tmp = htonl(out_data.enctype);
memcpy(output + index, &tmp, sizeof(out_data.enctype));
index += sizeof(out_data.enctype);
tmp = htonl(out_data.kvno);
memcpy(output + index, &tmp, sizeof(out_data.kvno));
index += sizeof(out_data.kvno);
tmp = htonl(out_data.ciphertext.length);
memcpy(output + index, &tmp, sizeof(out_data.ciphertext.length));
index += sizeof(out_data.ciphertext.length);
if (out_data.ciphertext.data) {
memcpy(output + index, out_data.ciphertext.data,
out_data.ciphertext.length);
free(out_data.ciphertext.data);
}
return TRUE;
}
int
ksm_rgenerate_out_msg(struct snmp_secmod_outgoing_params *parms)
{
krb5_auth_context auth_context = NULL;
krb5_error_code retcode;
krb5_ccache cc = NULL;
int retval = SNMPERR_SUCCESS;
krb5_data outdata, ivector;
krb5_keyblock *subkey = NULL;
#ifdef MIT_NEW_CRYPTO
krb5_data input;
krb5_enc_data output;
unsigned int numcksumtypes;
krb5_cksumtype *cksumtype_array;
#else /* MIT_NEW_CRYPTO */
krb5_encrypt_block eblock;
#endif /* MIT_NEW_CRYPTO */
size_t blocksize, encrypted_length;
unsigned char *encrypted_data = NULL;
int zero = 0, i;
u_char *cksum_pointer, *endp = *parms->wholeMsg;
krb5_cksumtype cksumtype;
krb5_checksum pdu_checksum;
u_char **wholeMsg = parms->wholeMsg;
size_t *offset = parms->wholeMsgOffset, seq_offset;
struct ksm_secStateRef *ksm_state = (struct ksm_secStateRef *)
parms->secStateRef;
int rc;
DEBUGMSGTL(("ksm", "Starting KSM processing\n"));
outdata.length = 0;
outdata.data = NULL;
ivector.length = 0;
ivector.data = NULL;
pdu_checksum.contents = NULL;
if (!ksm_state) {
/*
* If we don't have a ksm_state, then we're a request. Get a
* credential cache and build a ap_req.
*/
retcode = krb5_cc_default(kcontext, &cc);
if (retcode) {
DEBUGMSGTL(("ksm", "KSM: krb5_cc_default failed: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
DEBUGMSGTL(("ksm", "KSM: Set credential cache successfully\n"));
/*
* This seems odd, since we don't need this until later (or earlier,
* depending on how you look at it), but because the most likely
* errors are Kerberos at this point, I'll get this now to save
* time not encoding the rest of the packet.
*
* Also, we need the subkey to encrypt the PDU (if required).
*/
retcode =
krb5_mk_req(kcontext, &auth_context,
AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
(char *) service_name, parms->session->peername, NULL,
cc, &outdata);
if (retcode) {
DEBUGMSGTL(("ksm", "KSM: krb5_mk_req failed: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
DEBUGMSGTL(("ksm", "KSM: ticket retrieved successfully for \"%s/%s\" "
"(may not be actual ticket sname)\n", service_name,
parms->session->peername));
} else {
/*
* Grab the auth_context from our security state reference
*/
auth_context = ksm_state->auth_context;
/*
* Bundle up an AP_REP. Note that we do this only when we
* have a security state reference (which means we're in an agent
* and we're sending a response).
*/
DEBUGMSGTL(("ksm", "KSM: Starting reply processing.\n"));
retcode = krb5_mk_rep(kcontext, auth_context, &outdata);
if (retcode) {
DEBUGMSGTL(("ksm", "KSM: krb5_mk_rep failed: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
DEBUGMSGTL(("ksm", "KSM: Finished with krb5_mk_rep()\n"));
}
/*
* If we have to encrypt the PDU, do that now
*/
if (parms->secLevel == SNMP_SEC_LEVEL_AUTHPRIV) {
DEBUGMSGTL(("ksm", "KSM: Starting PDU encryption.\n"));
/*
* It's weird -
*
* If we're on the manager, it's a local subkey (because that's in
* our AP_REQ)
*
* If we're on the agent, it's a remote subkey (because that comes
* FROM the received AP_REQ).
*/
if (ksm_state)
retcode = krb5_auth_con_getremotesubkey(kcontext, auth_context,
&subkey);
else
retcode = krb5_auth_con_getlocalsubkey(kcontext, auth_context,
&subkey);
if (retcode) {
DEBUGMSGTL(("ksm",
"KSM: krb5_auth_con_getlocalsubkey failed: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
/*
* Note that here we need to handle different things between the
* old and new crypto APIs. First, we need to get the final encrypted
* length of the PDU.
*/
#ifdef MIT_NEW_CRYPTO
retcode = krb5_c_encrypt_length(kcontext, subkey->enctype,
parms->scopedPduLen,
&encrypted_length);
if (retcode) {
DEBUGMSGTL(("ksm",
"Encryption length calculation failed: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
#else /* MIT_NEW_CRYPTO */
krb5_use_enctype(kcontext, &eblock, subkey->enctype);
retcode = krb5_process_key(kcontext, &eblock, subkey);
if (retcode) {
DEBUGMSGTL(("ksm", "krb5_process_key failed: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
encrypted_length = krb5_encrypt_size(parms->scopedPduLen,
eblock.crypto_entry);
#endif /* MIT_NEW_CRYPTO */
encrypted_data = malloc(encrypted_length);
if (!encrypted_data) {
DEBUGMSGTL(("ksm",
"KSM: Unable to malloc %d bytes for encrypt "
"buffer: %s\n", parms->scopedPduLen,
strerror(errno)));
retval = SNMPERR_MALLOC;
#ifndef MIT_NEW_CRYPTO
krb5_finish_key(kcontext, &eblock);
#endif /* ! MIT_NEW_CRYPTO */
goto error;
}
/*
* We need to set up a blank initialization vector for the encryption.
* Use a block of all zero's (which is dependent on the block size
* of the encryption method).
*/
#ifdef MIT_NEW_CRYPTO
retcode = krb5_c_block_size(kcontext, subkey->enctype, &blocksize);
if (retcode) {
DEBUGMSGTL(("ksm",
"Unable to determine crypto block size: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
#else /* MIT_NEW_CRYPTO */
blocksize =
krb5_enctype_array[subkey->enctype]->system->block_length;
#endif /* MIT_NEW_CRYPTO */
ivector.data = malloc(blocksize);
if (!ivector.data) {
DEBUGMSGTL(("ksm", "Unable to allocate %d bytes for ivector\n",
blocksize));
retval = SNMPERR_MALLOC;
goto error;
}
ivector.length = blocksize;
memset(ivector.data, 0, blocksize);
/*
* Finally! Do the encryption!
*/
#ifdef MIT_NEW_CRYPTO
input.data = (char *) parms->scopedPdu;
input.length = parms->scopedPduLen;
output.ciphertext.data = (char *) encrypted_data;
output.ciphertext.length = encrypted_length;
retcode =
krb5_c_encrypt(kcontext, subkey, KSM_KEY_USAGE_ENCRYPTION,
&ivector, &input, &output);
#else /* MIT_NEW_CRYPTO */
retcode = krb5_encrypt(kcontext, (krb5_pointer) parms->scopedPdu,
(krb5_pointer) encrypted_data,
parms->scopedPduLen, &eblock, ivector.data);
krb5_finish_key(kcontext, &eblock);
#endif /* MIT_NEW_CRYPTO */
if (retcode) {
DEBUGMSGTL(("ksm", "KSM: krb5_encrypt failed: %s\n",
error_message(retcode)));
retval = SNMPERR_KRB5;
snmp_set_detail(error_message(retcode));
goto error;
}
*offset = 0;
rc = asn_realloc_rbuild_string(wholeMsg, parms->wholeMsgLen,
offset, 1,
(u_char) (ASN_UNIVERSAL |
ASN_PRIMITIVE |
ASN_OCTET_STR),
encrypted_data,
encrypted_length);
if (rc == 0) {
DEBUGMSGTL(("ksm", "Building encrypted payload failed.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
DEBUGMSGTL(("ksm", "KSM: Encryption complete.\n"));
} else {
/*
* Plaintext PDU (not encrypted)
*/
if (*parms->wholeMsgLen < parms->scopedPduLen) {
DEBUGMSGTL(("ksm", "Not enough room for plaintext PDU.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
}
/*
* Start encoding the msgSecurityParameters
*
* For now, use 0 for the response hint
*/
DEBUGMSGTL(("ksm", "KSM: scopedPdu added to payload\n"));
seq_offset = *offset;
rc = asn_realloc_rbuild_int(wholeMsg, parms->wholeMsgLen,
offset, 1,
(u_char) (ASN_UNIVERSAL |
ASN_PRIMITIVE |
ASN_INTEGER),
(long *) &zero, sizeof(zero));
if (rc == 0) {
DEBUGMSGTL(("ksm", "Building ksm security parameters failed.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
rc = asn_realloc_rbuild_string(wholeMsg, parms->wholeMsgLen,
offset, 1,
(u_char) (ASN_UNIVERSAL |
ASN_PRIMITIVE |
ASN_OCTET_STR),
(u_char *) outdata.data,
outdata.length);
if (rc == 0) {
DEBUGMSGTL(("ksm", "Building ksm AP_REQ failed.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
/*
* Now, we need to pick the "right" checksum algorithm. For old
* crypto, just pick CKSUMTYPE_RSA_MD5_DES; for new crypto, pick
* one of the "approved" ones.
*/
#ifdef MIT_NEW_CRYPTO
retcode = krb5_c_keyed_checksum_types(kcontext, subkey->enctype,
&numcksumtypes, &cksumtype_array);
if (retcode) {
DEBUGMSGTL(("ksm", "Unable to find appropriate keyed checksum: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
if (numcksumtypes <= 0) {
DEBUGMSGTL(("ksm", "We received a list of zero cksumtypes for this "
"enctype (%d)\n", subkey->enctype));
snmp_set_detail("No valid checksum type for this encryption type");
retval = SNMPERR_KRB5;
goto error;
}
/*
* It's not clear to me from the API which checksum you're supposed
* to support, so I'm taking a guess at the first one
*/
cksumtype = cksumtype_array[0];
krb5_free_cksumtypes(kcontext, cksumtype_array);
DEBUGMSGTL(("ksm", "KSM: Choosing checksum type of %d (subkey type "
"of %d)\n", cksumtype, subkey->enctype));
retcode = krb5_c_checksum_length(kcontext, cksumtype, &blocksize);
if (retcode) {
DEBUGMSGTL(("ksm", "Unable to determine checksum length: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
pdu_checksum.length = blocksize;
#else /* MIT_NEW_CRYPTO */
if (ksm_state)
cksumtype = ksm_state->cksumtype;
else
cksumtype = CKSUMTYPE_RSA_MD5_DES;
if (!is_keyed_cksum(cksumtype)) {
DEBUGMSGTL(("ksm", "Checksum type %d is not a keyed checksum\n",
cksumtype));
snmp_set_detail("Checksum is not a keyed checksum");
retval = SNMPERR_KRB5;
goto error;
}
if (!is_coll_proof_cksum(cksumtype)) {
DEBUGMSGTL(("ksm", "Checksum type %d is not a collision-proof "
"checksum\n", cksumtype));
snmp_set_detail("Checksum is not a collision-proof checksum");
retval = SNMPERR_KRB5;
goto error;
}
pdu_checksum.length = krb5_checksum_size(kcontext, cksumtype);
pdu_checksum.checksum_type = cksumtype;
#endif /* MIT_NEW_CRYPTO */
/*
* Note that here, we're just leaving blank space for the checksum;
* we remember where that is, and we'll fill it in later.
*/
*offset += pdu_checksum.length;
memset(*wholeMsg + *parms->wholeMsgLen - *offset, 0, pdu_checksum.length);
cksum_pointer = *wholeMsg + *parms->wholeMsgLen - *offset;
rc = asn_realloc_rbuild_header(wholeMsg, parms->wholeMsgLen,
parms->wholeMsgOffset, 1,
(u_char) (ASN_UNIVERSAL |
ASN_PRIMITIVE |
ASN_OCTET_STR),
pdu_checksum.length);
if (rc == 0) {
DEBUGMSGTL(("ksm", "Building ksm security parameters failed.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
rc = asn_realloc_rbuild_int(wholeMsg, parms->wholeMsgLen,
parms->wholeMsgOffset, 1,
(u_char) (ASN_UNIVERSAL |
ASN_PRIMITIVE |
ASN_OCTET_STR),
(long *) &cksumtype,
sizeof(cksumtype));
if (rc == 0) {
DEBUGMSGTL(("ksm", "Building ksm security parameters failed.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
rc = asn_realloc_rbuild_sequence(wholeMsg, parms->wholeMsgLen,
parms->wholeMsgOffset, 1,
(u_char) (ASN_SEQUENCE |
ASN_CONSTRUCTOR),
*offset - seq_offset);
if (rc == 0) {
DEBUGMSGTL(("ksm", "Building ksm security parameters failed.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
rc = asn_realloc_rbuild_header(wholeMsg, parms->wholeMsgLen,
parms->wholeMsgOffset, 1,
(u_char) (ASN_UNIVERSAL |
ASN_PRIMITIVE |
ASN_OCTET_STR),
*offset - seq_offset);
if (rc == 0) {
DEBUGMSGTL(("ksm", "Building ksm security parameters failed.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
DEBUGMSGTL(("ksm", "KSM: Security parameter encoding completed\n"));
/*
* We're done with the KSM security parameters - now we do the global
* header and wrap up the whole PDU.
*/
if (*parms->wholeMsgLen < parms->globalDataLen) {
DEBUGMSGTL(("ksm", "Building global data failed.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
*offset += parms->globalDataLen;
memcpy(*wholeMsg + *parms->wholeMsgLen - *offset,
parms->globalData, parms->globalDataLen);
rc = asn_realloc_rbuild_sequence(wholeMsg, parms->wholeMsgLen,
offset, 1,
(u_char) (ASN_SEQUENCE |
ASN_CONSTRUCTOR),
*offset);
if (rc == 0) {
DEBUGMSGTL(("ksm", "Building master packet sequence.\n"));
retval = SNMPERR_TOO_LONG;
goto error;
}
DEBUGMSGTL(("ksm", "KSM: PDU master packet encoding complete.\n"));
/*
* Now we need to checksum the entire PDU (since it's built).
*/
pdu_checksum.contents = malloc(pdu_checksum.length);
if (!pdu_checksum.contents) {
DEBUGMSGTL(("ksm", "Unable to malloc %d bytes for checksum\n",
pdu_checksum.length));
retval = SNMPERR_MALLOC;
goto error;
}
/*
* If we didn't encrypt the packet, we haven't yet got the subkey.
* Get that now.
*/
if (!subkey) {
if (ksm_state)
retcode = krb5_auth_con_getremotesubkey(kcontext, auth_context,
&subkey);
else
retcode = krb5_auth_con_getlocalsubkey(kcontext, auth_context,
&subkey);
if (retcode) {
DEBUGMSGTL(("ksm", "krb5_auth_con_getlocalsubkey failed: %s\n",
error_message(retcode)));
snmp_set_detail(error_message(retcode));
retval = SNMPERR_KRB5;
goto error;
}
}
#ifdef MIT_NEW_CRYPTO
input.data = (char *) (*wholeMsg + *parms->wholeMsgLen - *offset);
input.length = *offset;
retcode = krb5_c_make_checksum(kcontext, cksumtype, subkey,
KSM_KEY_USAGE_CHECKSUM, &input,
&pdu_checksum);
#else /* MIT_NEW_CRYPTO */
retcode = krb5_calculate_checksum(kcontext, cksumtype, *wholeMsg +
*parms->wholeMsgLen - *offset,
*offset,
(krb5_pointer) subkey->contents,
subkey->length, &pdu_checksum);
#endif /* MIT_NEW_CRYPTO */
if (retcode) {
DEBUGMSGTL(("ksm", "Calculate checksum failed: %s\n",
error_message(retcode)));
retval = SNMPERR_KRB5;
snmp_set_detail(error_message(retcode));
goto error;
}
DEBUGMSGTL(("ksm", "KSM: Checksum calculation complete.\n"));
memcpy(cksum_pointer, pdu_checksum.contents, pdu_checksum.length);
DEBUGMSGTL(("ksm", "KSM: Writing checksum of %d bytes at offset %d\n",
pdu_checksum.length, cksum_pointer - (*wholeMsg + 1)));
DEBUGMSGTL(("ksm", "KSM: Checksum:"));
for (i = 0; i < pdu_checksum.length; i++)
DEBUGMSG(("ksm", " %02x",
(unsigned int) pdu_checksum.contents[i]));
DEBUGMSG(("ksm", "\n"));
/*
* If we're _not_ called as part of a response (null ksm_state),
* then save the auth_context for later using our cache routines.
*/
if (!ksm_state) {
if ((retval = ksm_insert_cache(parms->pdu->msgid, auth_context,
(u_char *) parms->secName,
parms->secNameLen)) !=
SNMPERR_SUCCESS)
goto error;
auth_context = NULL;
}
DEBUGMSGTL(("ksm", "KSM processing complete!\n"));
error:
if (pdu_checksum.contents)
#ifdef MIT_NEW_CRYPTO
krb5_free_checksum_contents(kcontext, &pdu_checksum);
#else /* MIT_NEW_CRYPTO */
free(pdu_checksum.contents);
#endif /* MIT_NEW_CRYPTO */
if (ivector.data)
free(ivector.data);
if (subkey)
krb5_free_keyblock(kcontext, subkey);
if (encrypted_data)
free(encrypted_data);
if (cc)
krb5_cc_close(kcontext, cc);
if (auth_context && !ksm_state)
krb5_auth_con_free(kcontext, auth_context);
return retval;
}
/*ARGSUSED*/
static
krb5_error_code pa_sam(krb5_context context,
krb5_kdc_req *request,
krb5_pa_data *in_padata,
krb5_pa_data **out_padata,
krb5_data *salt,
krb5_data *s2kparams,
krb5_enctype *etype,
krb5_keyblock *as_key,
krb5_prompter_fct prompter,
void *prompter_data,
krb5_gic_get_as_key_fct gak_fct,
void *gak_data)
{
krb5_error_code ret;
krb5_data tmpsam;
char name[100], banner[100];
char prompt[100], response[100];
krb5_data response_data;
krb5_prompt kprompt;
krb5_prompt_type prompt_type;
krb5_data defsalt;
krb5_sam_challenge *sam_challenge = 0;
krb5_sam_response sam_response;
/* these two get encrypted and stuffed in to sam_response */
krb5_enc_sam_response_enc enc_sam_response_enc;
krb5_data * scratch;
krb5_pa_data * pa;
krb5_enc_data * enc_data;
size_t enclen;
if (prompter == NULL)
return (EIO);
tmpsam.length = in_padata->length;
tmpsam.data = (char *) in_padata->contents;
if ((ret = decode_krb5_sam_challenge(&tmpsam, &sam_challenge)))
return(ret);
if (sam_challenge->sam_flags & KRB5_SAM_MUST_PK_ENCRYPT_SAD) {
krb5_xfree(sam_challenge);
return(KRB5_SAM_UNSUPPORTED);
}
/* If we need the password from the user (USE_SAD_AS_KEY not set), */
/* then get it here. Exception for "old" KDCs with CryptoCard */
/* support which uses the USE_SAD_AS_KEY flag, but still needs pwd */
if (!(sam_challenge->sam_flags & KRB5_SAM_USE_SAD_AS_KEY) ||
(sam_challenge->sam_type == PA_SAM_TYPE_CRYPTOCARD)) {
/* etype has either been set by caller or by KRB5_PADATA_ETYPE_INFO */
/* message from the KDC. If it is not set, pick an enctype that we */
/* think the KDC will have for us. */
if (etype && *etype == 0)
*etype = ENCTYPE_DES_CBC_CRC;
if ((ret = (gak_fct)(context, request->client, *etype, prompter,
prompter_data, salt, s2kparams, as_key, gak_data)))
return(ret);
}
sprintf(name, "%.*s",
SAMDATA(sam_challenge->sam_type_name, "SAM Authentication",
sizeof(name) - 1));
sprintf(banner, "%.*s",
SAMDATA(sam_challenge->sam_challenge_label,
sam_challenge_banner(sam_challenge->sam_type),
sizeof(banner)-1));
/* sprintf(prompt, "Challenge is [%s], %s: ", challenge, prompt); */
sprintf(prompt, "%s%.*s%s%.*s",
sam_challenge->sam_challenge.length?"Challenge is [":"",
SAMDATA(sam_challenge->sam_challenge, "", 20),
sam_challenge->sam_challenge.length?"], ":"",
SAMDATA(sam_challenge->sam_response_prompt, "passcode", 55));
response_data.data = response;
response_data.length = sizeof(response);
kprompt.prompt = prompt;
kprompt.hidden = 1;
kprompt.reply = &response_data;
prompt_type = KRB5_PROMPT_TYPE_PREAUTH;
/* PROMPTER_INVOCATION */
krb5int_set_prompt_types(context, &prompt_type);
if ((ret = ((*prompter)(context, prompter_data, name,
banner, 1, &kprompt)))) {
krb5_xfree(sam_challenge);
krb5int_set_prompt_types(context, 0);
return(ret);
}
krb5int_set_prompt_types(context, 0);
enc_sam_response_enc.sam_nonce = sam_challenge->sam_nonce;
if (sam_challenge->sam_nonce == 0) {
if ((ret = krb5_us_timeofday(context,
&enc_sam_response_enc.sam_timestamp,
&enc_sam_response_enc.sam_usec))) {
krb5_xfree(sam_challenge);
return(ret);
}
sam_response.sam_patimestamp = enc_sam_response_enc.sam_timestamp;
}
/* XXX What if more than one flag is set? */
if (sam_challenge->sam_flags & KRB5_SAM_SEND_ENCRYPTED_SAD) {
/* Most of this should be taken care of before we get here. We */
/* will need the user's password and as_key to encrypt the SAD */
/* and we want to preserve ordering of user prompts (first */
/* password, then SAM data) so that user's won't be confused. */
if (as_key->length) {
krb5_free_keyblock_contents(context, as_key);
as_key->length = 0;
}
/* generate a salt using the requested principal */
if ((salt->length == -1) && (salt->data == NULL)) {
if ((ret = krb5_principal2salt(context, request->client,
&defsalt))) {
krb5_xfree(sam_challenge);
return(ret);
}
salt = &defsalt;
} else {
defsalt.length = 0;
}
/* generate a key using the supplied password */
ret = krb5_c_string_to_key(context, ENCTYPE_DES_CBC_MD5,
(krb5_data *)gak_data, salt, as_key);
if (defsalt.length)
krb5_xfree(defsalt.data);
if (ret) {
krb5_xfree(sam_challenge);
return(ret);
}
/* encrypt the passcode with the key from above */
enc_sam_response_enc.sam_sad = response_data;
} else if (sam_challenge->sam_flags & KRB5_SAM_USE_SAD_AS_KEY) {
/* process the key as password */
if (as_key->length) {
krb5_free_keyblock_contents(context, as_key);
as_key->length = 0;
}
#if 0
if ((salt->length == -1) && (salt->data == NULL)) {
if (ret = krb5_principal2salt(context, request->client,
&defsalt)) {
krb5_xfree(sam_challenge);
return(ret);
}
salt = &defsalt;
} else {
defsalt.length = 0;
}
#else
defsalt.length = 0;
salt = NULL;
#endif
/* XXX As of the passwords-04 draft, no enctype is specified,
the server uses ENCTYPE_DES_CBC_MD5. In the future the
server should send a PA-SAM-ETYPE-INFO containing the enctype. */
ret = krb5_c_string_to_key(context, ENCTYPE_DES_CBC_MD5,
&response_data, salt, as_key);
if (defsalt.length)
krb5_xfree(defsalt.data);
if (ret) {
krb5_xfree(sam_challenge);
return(ret);
}
enc_sam_response_enc.sam_sad.length = 0;
} else {
/* Eventually, combine SAD with long-term key to get
encryption key. */
return KRB5_PREAUTH_BAD_TYPE;
}
/* copy things from the challenge */
sam_response.sam_nonce = sam_challenge->sam_nonce;
sam_response.sam_flags = sam_challenge->sam_flags;
sam_response.sam_track_id = sam_challenge->sam_track_id;
sam_response.sam_type = sam_challenge->sam_type;
sam_response.magic = KV5M_SAM_RESPONSE;
krb5_xfree(sam_challenge);
/* encode the encoded part of the response */
if ((ret = encode_krb5_enc_sam_response_enc(&enc_sam_response_enc,
&scratch)))
return(ret);
/*
* Solaris Kerberos:
* Using new crypto interface now so we can get rid of the
* old modules.
*/
if ((ret = krb5_c_encrypt_length(context, as_key->enctype,
scratch->length, &enclen))) {
krb5_free_data(context, scratch);
return(ret);
}
enc_data = &sam_response.sam_enc_nonce_or_ts;
enc_data->magic = KV5M_ENC_DATA;
enc_data->kvno = 0;
enc_data->enctype = as_key->enctype;
enc_data->ciphertext.length = enclen;
if ((enc_data->ciphertext.data = MALLOC(enclen)) == NULL) {
enc_data->ciphertext.length = 0;
krb5_free_data(context, scratch);
return(ENOMEM);
}
if ((ret = krb5_c_encrypt(context, as_key, 0, 0,
scratch, enc_data))) {
FREE(enc_data->ciphertext.data, enclen);
enc_data->ciphertext.data = NULL;
enc_data->ciphertext.length = 0;
}
krb5_free_data(context, scratch);
if (ret)
return(ret);
/* sam_enc_key is reserved for future use */
sam_response.sam_enc_key.ciphertext.length = 0;
if ((pa = malloc(sizeof(krb5_pa_data))) == NULL)
return(ENOMEM);
if ((ret = encode_krb5_sam_response(&sam_response, &scratch))) {
free(pa);
return(ret);
}
pa->magic = KV5M_PA_DATA;
pa->pa_type = KRB5_PADATA_SAM_RESPONSE;
pa->length = scratch->length;
pa->contents = (krb5_octet *) scratch->data;
*out_padata = pa;
return(0);
}