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Add impersonate.

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@17615 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2006-06-06 14:57:16 +00:00
parent f90b31406f
commit eb409f99aa
1 changed files with 273 additions and 19 deletions
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292
lib/krb5/get_cred.c
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@@ -142,6 +142,7 @@ init_tgs_req (krb5_context context,
krb5_creds *in_creds,
krb5_creds *krbtgt,
unsigned nonce,
const METHOD_DATA *padata,
krb5_keyblock **subkey,
TGS_REQ *t,
krb5_key_usage usage)
@@ -220,12 +221,22 @@ init_tgs_req (krb5_context context,
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
ALLOC_SEQ(t->padata, 1);
ALLOC_SEQ(t->padata, 1 + padata->len);
if (t->padata->val == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
{
int i;
for (i = 0; i < padata->len; i++) {
ret = copy_PA_DATA(&padata->val[i], &t->padata->val[i + 1]);
if (ret) {
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
}
}
{
krb5_auth_context ac;
@@ -268,7 +279,7 @@ init_tgs_req (krb5_context context,
ret = make_pa_tgs_req(context,
ac,
&t->req_body,
t->padata->val,
&t->padata->val[0],
krbtgt,
usage);
if(ret) {
@@ -383,8 +394,9 @@ get_cred_kdc_usage(krb5_context context,
krb5_ccache id,
krb5_kdc_flags flags,
krb5_addresses *addresses,
krb5_creds *in_creds,
krb5_creds *in_creds,
krb5_creds *krbtgt,
krb5_principal impersonate_principal,
krb5_creds *out_creds,
krb5_key_usage usage)
{
@@ -399,9 +411,12 @@ get_cred_kdc_usage(krb5_context context,
size_t len;
Ticket second_ticket;
int send_to_kdc_flags = 0;
METHOD_DATA padata;
krb5_data_zero(&resp);
krb5_data_zero(&enc);
padata.val = NULL;
padata.len = 0;
krb5_generate_random_block(&nonce, sizeof(nonce));
nonce &= 0xffffffff;
@@ -414,6 +429,58 @@ get_cred_kdc_usage(krb5_context context,
return ret;
}
if (impersonate_principal) {
krb5_crypto crypto;
PA_S4U2Self self;
krb5_data data;
void *buf;
size_t size;
self.name = impersonate_principal->name;
self.realm = impersonate_principal->realm;
self.auth = estrdup("Kerberos");
ret = _krb5_s4u2self_to_checksumdata(context, &self, &data);
if (ret) {
free(self.auth);
goto out;
}
ret = krb5_crypto_init(context, &krbtgt->session, 0, &crypto);
if (ret) {
free(self.auth);
krb5_data_free(&data);
goto out;
}
ret = krb5_create_checksum(context,
crypto,
KRB5_KU_TGS_IMPERSONATE,
0,
data.data,
data.length,
&self.cksum);
krb5_crypto_destroy(context, crypto);
krb5_data_free(&data);
if (ret) {
free(self.auth);
goto out;
}
ASN1_MALLOC_ENCODE(PA_S4U2Self, buf, len, &self, &size, ret);
free(self.auth);
free_Checksum(&self.cksum);
if (ret)
goto out;
if (len != size)
krb5_abortx(context, "internal asn1 error");
ret = krb5_padata_add(context, &padata, KRB5_PADATA_S4U2SELF, buf, len);
if (ret)
goto out;
}
ret = init_tgs_req (context,
id,
addresses,
@@ -422,11 +489,14 @@ get_cred_kdc_usage(krb5_context context,
in_creds,
krbtgt,
nonce,
&padata,
&subkey,
&req,
usage);
if(flags.b.enc_tkt_in_skey)
if(flags.b.enc_tkt_in_skey) {
free_METHOD_DATA(&padata);
free_Ticket(&second_ticket);
}
if (ret)
goto out;
@@ -475,7 +545,7 @@ again:
&krbtgt->addresses,
nonce,
TRUE,
flags.b.request_anonymous,
TRUE /* flags.b.request_anonymous */,
decrypt_tkt_with_subkey,
subkey);
krb5_free_kdc_rep(context, &rep);
@@ -497,6 +567,7 @@ again:
}
out:
free_METHOD_DATA(&padata);
krb5_data_free(&resp);
krb5_data_free(&enc);
if(subkey){
@@ -514,16 +585,19 @@ get_cred_kdc(krb5_context context,
krb5_addresses *addresses,
krb5_creds *in_creds,
krb5_creds *krbtgt,
krb5_principal impersonate_principal,
krb5_creds *out_creds)
{
krb5_error_code ret;
ret = get_cred_kdc_usage(context, id, flags, addresses, in_creds,
krbtgt, out_creds, KRB5_KU_TGS_REQ_AUTH);
krbtgt, impersonate_principal, out_creds,
KRB5_KU_TGS_REQ_AUTH);
if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
krb5_clear_error_string (context);
ret = get_cred_kdc_usage(context, id, flags, addresses, in_creds,
krbtgt, out_creds, KRB5_KU_AP_REQ_AUTH);
krbtgt, impersonate_principal, out_creds,
KRB5_KU_AP_REQ_AUTH);
}
return ret;
}
@@ -533,7 +607,7 @@ get_cred_kdc(krb5_context context,
static krb5_error_code
get_cred_kdc_la(krb5_context context, krb5_ccache id, krb5_kdc_flags flags,
krb5_creds *in_creds, krb5_creds *krbtgt,
krb5_creds *out_creds)
krb5_principal impersonate_principal, krb5_creds *out_creds)
{
krb5_error_code ret;
krb5_addresses addresses, *addrs = &addresses;
@@ -543,7 +617,7 @@ get_cred_kdc_la(krb5_context context, krb5_ccache id, krb5_kdc_flags flags,
if(addresses.len == 0)
addrs = NULL;
ret = get_cred_kdc(context, id, flags, addrs,
in_creds, krbtgt, out_creds);
in_creds, krbtgt, impersonate_principal, out_creds);
krb5_free_addresses(context, &addresses);
return ret;
}
@@ -575,7 +649,7 @@ krb5_get_kdc_cred(krb5_context context,
return ret;
}
ret = get_cred_kdc(context, id, flags, addresses,
in_creds, krbtgt, *out_creds);
in_creds, krbtgt, NULL, *out_creds);
krb5_free_creds (context, krbtgt);
if(ret)
free(*out_creds);
@@ -607,7 +681,17 @@ find_cred(krb5_context context,
}
tgts++;
}
krb5_clear_error_string(context);
{
char *str;
ret = krb5_unparse_name(context, server, &str);
if(ret == 0) {
krb5_set_error_string(context, "Matching credential "
"(%s) not found", str);
free(str);
} else {
krb5_clear_error_string(context);
}
}
return KRB5_CC_NOTFOUND;
}
@@ -650,6 +734,7 @@ get_cred_from_kdc_flags(krb5_context context,
krb5_kdc_flags flags,
krb5_ccache ccache,
krb5_creds *in_creds,
krb5_principal impersonate_principal,
krb5_creds **out_creds,
krb5_creds ***ret_tgts)
{
@@ -707,10 +792,12 @@ get_cred_from_kdc_flags(krb5_context context,
if (noaddr)
ret = get_cred_kdc(context, ccache, flags, NULL,
in_creds, &tgts, *out_creds);
in_creds, &tgts,
impersonate_principal, *out_creds);
else
ret = get_cred_kdc_la(context, ccache, flags,
in_creds, &tgts, *out_creds);
in_creds, &tgts,
impersonate_principal, *out_creds);
if (ret) {
free (*out_creds);
*out_creds = NULL;
@@ -731,7 +818,7 @@ get_cred_from_kdc_flags(krb5_context context,
heim_general_string tgt_inst;
ret = get_cred_from_kdc_flags(context, flags, ccache, &tmp_creds,
&tgt, ret_tgts);
NULL, &tgt, ret_tgts);
if(ret) {
krb5_free_principal(context, tmp_creds.server);
krb5_free_principal(context, tmp_creds.client);
@@ -776,10 +863,10 @@ get_cred_from_kdc_flags(krb5_context context,
&noaddr);
if (noaddr)
ret = get_cred_kdc (context, ccache, flags, NULL,
in_creds, tgt, *out_creds);
in_creds, tgt, NULL, *out_creds);
else
ret = get_cred_kdc_la(context, ccache, flags,
in_creds, tgt, *out_creds);
in_creds, tgt, NULL, *out_creds);
if (ret) {
free (*out_creds);
*out_creds = NULL;
@@ -800,7 +887,7 @@ krb5_get_cred_from_kdc_opt(krb5_context context,
krb5_kdc_flags f;
f.i = flags;
return get_cred_from_kdc_flags(context, f, ccache,
in_creds, out_creds, ret_tgts);
in_creds, NULL, out_creds, ret_tgts);
}
krb5_error_code KRB5_LIB_FUNCTION
@@ -879,15 +966,18 @@ krb5_get_credentials_with_flags(krb5_context context,
}
if(options & KRB5_GC_USER_USER)
flags.b.enc_tkt_in_skey = 1;
if (flags.b.enc_tkt_in_skey)
options |= KRB5_GC_NO_STORE;
tgts = NULL;
ret = get_cred_from_kdc_flags(context, flags, ccache,
in_creds, out_creds, &tgts);
in_creds, NULL, out_creds, &tgts);
for(i = 0; tgts && tgts[i]; i++) {
krb5_cc_store_cred(context, ccache, tgts[i]);
krb5_free_creds(context, tgts[i]);
}
free(tgts);
if(ret == 0 && flags.b.enc_tkt_in_skey == 0)
if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
krb5_cc_store_cred(context, ccache, *out_creds);
return ret;
}
@@ -904,3 +994,167 @@ krb5_get_credentials(krb5_context context,
return krb5_get_credentials_with_flags(context, options, flags,
ccache, in_creds, out_creds);
}
struct krb5_get_creds_opt_data {
krb5_principal self;
krb5_flags options;
krb5_enctype enctype;
};
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt)
{
*opt = calloc(1, sizeof(**opt));
if (*opt == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
return 0;
}
void KRB5_LIB_FUNCTION
krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt)
{
if (opt->self)
krb5_free_principal(context, opt->self);
memset(opt, 0, sizeof(*opt));
free(opt);
}
void KRB5_LIB_FUNCTION
krb5_get_creds_opt_set_options(krb5_context context,
krb5_get_creds_opt opt,
krb5_flags options)
{
opt->options = options;
}
void KRB5_LIB_FUNCTION
krb5_get_creds_opt_add_options(krb5_context context,
krb5_get_creds_opt opt,
krb5_flags options)
{
opt->options |= options;
}
void KRB5_LIB_FUNCTION
krb5_get_creds_opt_set_enctype(krb5_context context,
krb5_get_creds_opt opt,
krb5_enctype enctype)
{
opt->enctype = enctype;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_creds_opt_set_impersonate(krb5_context context,
krb5_get_creds_opt opt,
krb5_const_principal self)
{
if (opt->self)
krb5_free_principal(context, opt->self);
return krb5_copy_principal(context, self, &opt->self);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_creds(krb5_context context,
krb5_get_creds_opt opt,
krb5_ccache ccache,
krb5_const_principal inprinc,
krb5_creds **out_creds)
{
krb5_kdc_flags flags;
krb5_flags options;
krb5_creds in_creds;
krb5_error_code ret;
krb5_creds **tgts;
krb5_creds *res_creds;
int i;
memset(&in_creds, 0, sizeof(in_creds));
in_creds.server = rk_UNCONST(inprinc);
ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
if (ret)
return ret;
options = opt->options;
flags.i = 0;
*out_creds = NULL;
res_creds = calloc(1, sizeof(*res_creds));
if (res_creds == NULL) {
krb5_free_principal(context, in_creds.client);
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
if (opt->enctype) {
in_creds.session.keytype = opt->enctype;
options |= KRB5_TC_MATCH_KEYTYPE;
}
/*
* If we got a credential, check if credential is expired before
* returning it.
*/
ret = krb5_cc_retrieve_cred(context,
ccache,
opt->enctype ? KRB5_TC_MATCH_KEYTYPE : 0,
&in_creds, res_creds);
/*
* If we got a credential, check if credential is expired before
* returning it, but only if KRB5_GC_EXPIRED_OK is not set.
*/
if (ret == 0) {
krb5_timestamp timeret;
/* If expired ok, don't bother checking */
if(options & KRB5_GC_EXPIRED_OK) {
*out_creds = res_creds;
krb5_free_principal(context, in_creds.client);
return 0;
}
krb5_timeofday(context, &timeret);
if(res_creds->times.endtime > timeret) {
*out_creds = res_creds;
krb5_free_principal(context, in_creds.client);
return 0;
}
if(options & KRB5_GC_CACHED)
krb5_cc_remove_cred(context, ccache, 0, res_creds);
} else if(ret != KRB5_CC_END) {
free(res_creds);
krb5_free_principal(context, in_creds.client);
return ret;
}
free(res_creds);
if(options & KRB5_GC_CACHED) {
krb5_clear_error_string (context);
krb5_free_principal(context, in_creds.client);
return KRB5_CC_NOTFOUND;
}
if(options & KRB5_GC_USER_USER) {
flags.b.enc_tkt_in_skey = 1;
options |= KRB5_GC_NO_STORE;
}
if (options & KRB5_GC_FORWARDABLE)
flags.b.forwardable = 1;
tgts = NULL;
ret = get_cred_from_kdc_flags(context, flags, ccache,
&in_creds, opt->self, out_creds, &tgts);
krb5_free_principal(context, in_creds.client);
for(i = 0; tgts && tgts[i]; i++) {
krb5_cc_store_cred(context, ccache, tgts[i]);
krb5_free_creds(context, tgts[i]);
}
free(tgts);
if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
krb5_cc_store_cred(context, ccache, *out_creds);
return ret;
}