r8302: import mini HEIMDAL into the tree

(This used to be commit 118be28a7aef233799956615a99d1a2a74dac175)

1 files changed, 427 insertions, 0 deletions

diff --git a/source4/heimdal/lib/krb5/get_for_creds.c b/source4/heimdal/lib/krb5/get_for_creds.c
new file mode 100644
index 0000000000..ea0bc4ad9e
--- /dev/null
+++ b/source4/heimdal/lib/krb5/get_for_creds.c
@@ -0,0 +1,427 @@
+/*
+ * 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 <krb5_locl.h>
+
+RCSID("$Id: get_for_creds.c,v 1.45 2005/06/15 02:44:36 lha Exp $");
+
+static krb5_error_code
+add_addrs(krb5_context context,
+	  krb5_addresses *addr,
+	  struct addrinfo *ai)
+{
+    krb5_error_code ret;
+    unsigned n, i;
+    void *tmp;
+    struct addrinfo *a;
+
+    n = 0;
+    for (a = ai; a != NULL; a = a->ai_next)
+	++n;
+
+    tmp = realloc(addr->val, (addr->len + n) * sizeof(*addr->val));
+    if (tmp == NULL) {
+	krb5_set_error_string(context, "malloc: out of memory");
+	ret = ENOMEM;
+	goto fail;
+    }
+    addr->val = tmp;
+    for (i = addr->len; i < (addr->len + n); ++i) {
+	addr->val[i].addr_type = 0;
+	krb5_data_zero(&addr->val[i].address);
+    }
+    i = addr->len;
+    for (a = ai; a != NULL; a = a->ai_next) {
+	krb5_address ad;
+
+	ret = krb5_sockaddr2address (context, a->ai_addr, &ad);
+	if (ret == 0) {
+	    if (krb5_address_search(context, &ad, addr))
+		krb5_free_address(context, &ad);
+	    else
+		addr->val[i++] = ad;
+	}
+	else if (ret == KRB5_PROG_ATYPE_NOSUPP)
+	    krb5_clear_error_string (context);
+	else
+	    goto fail;
+	addr->len = i;
+    }
+    return 0;
+fail:
+    krb5_free_addresses (context, addr);
+    return ret;
+}
+
+/*
+ * Forward credentials for `client' to host `hostname`,
+ * making them forwardable if `forwardable', and returning the
+ * blob of data to sent in `out_data'.
+ * If hostname == NULL, pick it from `server'
+ */
+
+krb5_error_code KRB5_LIB_FUNCTION
+krb5_fwd_tgt_creds (krb5_context	context,
+		    krb5_auth_context	auth_context,
+		    const char		*hostname,
+		    krb5_principal	client,
+		    krb5_principal	server,
+		    krb5_ccache		ccache,
+		    int			forwardable,
+		    krb5_data		*out_data)
+{
+    krb5_flags flags = 0;
+    krb5_creds creds;
+    krb5_error_code ret;
+    krb5_const_realm client_realm;
+
+    flags |= KDC_OPT_FORWARDED;
+
+    if (forwardable)
+	flags |= KDC_OPT_FORWARDABLE;
+
+    if (hostname == NULL &&
+	krb5_principal_get_type(context, server) == KRB5_NT_SRV_HST) {
+	const char *inst = krb5_principal_get_comp_string(context, server, 0);
+	const char *host = krb5_principal_get_comp_string(context, server, 1);
+
+	if (inst != NULL &&
+	    strcmp(inst, "host") == 0 &&
+	    host != NULL && 
+	    krb5_principal_get_comp_string(context, server, 2) == NULL)
+	    hostname = host;
+    }
+
+    client_realm = krb5_principal_get_realm(context, client);
+    
+    memset (&creds, 0, sizeof(creds));
+    creds.client = client;
+
+    ret = krb5_build_principal(context,
+			       &creds.server,
+			       strlen(client_realm),
+			       client_realm,
+			       KRB5_TGS_NAME,
+			       client_realm,
+			       NULL);
+    if (ret)
+	return ret;
+
+    ret = krb5_get_forwarded_creds (context,
+				    auth_context,
+				    ccache,
+				    flags,
+				    hostname,
+				    &creds,
+				    out_data);
+    return ret;
+}
+
+/*
+ *
+ */
+
+krb5_error_code KRB5_LIB_FUNCTION
+krb5_get_forwarded_creds (krb5_context	    context,
+			  krb5_auth_context auth_context,
+			  krb5_ccache       ccache,
+			  krb5_flags        flags,
+			  const char        *hostname,
+			  krb5_creds        *in_creds,
+			  krb5_data         *out_data)
+{
+    krb5_error_code ret;
+    krb5_creds *out_creds;
+    krb5_addresses addrs, *paddrs;
+    KRB_CRED cred;
+    KrbCredInfo *krb_cred_info;
+    EncKrbCredPart enc_krb_cred_part;
+    size_t len;
+    unsigned char *buf;
+    size_t buf_size;
+    krb5_kdc_flags kdc_flags;
+    krb5_crypto crypto;
+    struct addrinfo *ai;
+    int save_errno;
+    krb5_creds *ticket;
+    char *realm;
+
+    if (in_creds->client && in_creds->client->realm)
+	realm = in_creds->client->realm;
+    else
+	realm = in_creds->server->realm;
+
+    addrs.len = 0;
+    addrs.val = NULL;
+    paddrs = &addrs;
+
+    /*
+     * If tickets are address-less, forward address-less tickets.
+     */
+
+    ret = _krb5_get_krbtgt (context,
+			    ccache,
+			    realm,
+			    &ticket);
+    if(ret == 0) {
+	if (ticket->addresses.len == 0)
+	    paddrs = NULL;
+	krb5_free_creds (context, ticket);
+    }
+    
+    if (paddrs != NULL) {
+
+	ret = getaddrinfo (hostname, NULL, NULL, &ai);
+	if (ret) {
+	    save_errno = errno;
+	    krb5_set_error_string(context, "resolving %s: %s",
+				  hostname, gai_strerror(ret));
+	    return krb5_eai_to_heim_errno(ret, save_errno);
+	}
+	
+	ret = add_addrs (context, &addrs, ai);
+	freeaddrinfo (ai);
+	if (ret)
+	    return ret;
+    }
+    
+    kdc_flags.b = int2KDCOptions(flags);
+
+    ret = krb5_get_kdc_cred (context,
+			     ccache,
+			     kdc_flags,
+			     paddrs,
+			     NULL,
+			     in_creds,
+			     &out_creds);
+    krb5_free_addresses (context, &addrs);
+    if (ret) {
+	return ret;
+    }
+
+    memset (&cred, 0, sizeof(cred));
+    cred.pvno = 5;
+    cred.msg_type = krb_cred;
+    ALLOC_SEQ(&cred.tickets, 1);
+    if (cred.tickets.val == NULL) {
+	ret = ENOMEM;
+	krb5_set_error_string(context, "malloc: out of memory");
+	goto out2;
+    }
+    ret = decode_Ticket(out_creds->ticket.data,
+			out_creds->ticket.length,
+			cred.tickets.val, &len);
+    if (ret)
+	goto out3;
+
+    memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
+    ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1);
+    if (enc_krb_cred_part.ticket_info.val == NULL) {
+	ret = ENOMEM;
+	krb5_set_error_string(context, "malloc: out of memory");
+	goto out4;
+    }
+    
+    if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
+	krb5_timestamp sec;
+	int32_t usec;
+	
+	krb5_us_timeofday (context, &sec, &usec);
+	
+	ALLOC(enc_krb_cred_part.timestamp, 1);
+	if (enc_krb_cred_part.timestamp == NULL) {
+	    ret = ENOMEM;
+	    krb5_set_error_string(context, "malloc: out of memory");
+	    goto out4;
+	}
+	*enc_krb_cred_part.timestamp = sec;
+	ALLOC(enc_krb_cred_part.usec, 1);
+	if (enc_krb_cred_part.usec == NULL) {
+	    ret = ENOMEM;
+	    krb5_set_error_string(context, "malloc: out of memory");
+	    goto out4;
+	}
+	*enc_krb_cred_part.usec      = usec;
+    } else {
+	enc_krb_cred_part.timestamp = NULL;
+	enc_krb_cred_part.usec = NULL;
+    }
+
+    if (auth_context->local_address && auth_context->local_port) {
+	krb5_boolean noaddr;
+	krb5_const_realm srealm;
+
+	srealm = krb5_principal_get_realm(context, out_creds->server);
+	krb5_appdefault_boolean(context, NULL, srealm, "no-addresses", 
+				paddrs == NULL,	&noaddr);
+	if (!noaddr) {
+	    ret = krb5_make_addrport (context,
+				      &enc_krb_cred_part.s_address,
+				      auth_context->local_address,
+				      auth_context->local_port);
+	    if (ret)
+		goto out4;
+	}
+    }
+
+    if (auth_context->remote_address) {
+	if (auth_context->remote_port) {
+	    krb5_boolean noaddr;
+	    krb5_const_realm srealm;
+
+	    srealm = krb5_principal_get_realm(context, out_creds->server);
+	    /* Is this correct, and should we use the paddrs == NULL
+               trick here as well? Having an address-less ticket may
+               indicate that we don't know our own global address, but
+               it does not necessary mean that we don't know the
+               server's. */
+	    krb5_appdefault_boolean(context, NULL, srealm, "no-addresses",
+				    FALSE, &noaddr);
+	    if (!noaddr) {
+		ret = krb5_make_addrport (context,
+					  &enc_krb_cred_part.r_address,
+					  auth_context->remote_address,
+					  auth_context->remote_port);
+		if (ret)
+		    goto out4;
+	    }
+	} else {
+	    ALLOC(enc_krb_cred_part.r_address, 1);
+	    if (enc_krb_cred_part.r_address == NULL) {
+		ret = ENOMEM;
+		krb5_set_error_string(context, "malloc: out of memory");
+		goto out4;
+	    }
+
+	    ret = krb5_copy_address (context, auth_context->remote_address,
+				     enc_krb_cred_part.r_address);
+	    if (ret)
+		goto out4;
+	}
+    }
+
+    /* fill ticket_info.val[0] */
+
+    enc_krb_cred_part.ticket_info.len = 1;
+
+    krb_cred_info = enc_krb_cred_part.ticket_info.val;
+
+    copy_EncryptionKey (&out_creds->session, &krb_cred_info->key);
+    ALLOC(krb_cred_info->prealm, 1);
+    copy_Realm (&out_creds->client->realm, krb_cred_info->prealm);
+    ALLOC(krb_cred_info->pname, 1);
+    copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname);
+    ALLOC(krb_cred_info->flags, 1);
+    *krb_cred_info->flags          = out_creds->flags.b;
+    ALLOC(krb_cred_info->authtime, 1);
+    *krb_cred_info->authtime       = out_creds->times.authtime;
+    ALLOC(krb_cred_info->starttime, 1);
+    *krb_cred_info->starttime      = out_creds->times.starttime;
+    ALLOC(krb_cred_info->endtime, 1);
+    *krb_cred_info->endtime        = out_creds->times.endtime;
+    ALLOC(krb_cred_info->renew_till, 1);
+    *krb_cred_info->renew_till = out_creds->times.renew_till;
+    ALLOC(krb_cred_info->srealm, 1);
+    copy_Realm (&out_creds->server->realm, krb_cred_info->srealm);
+    ALLOC(krb_cred_info->sname, 1);
+    copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname);
+    ALLOC(krb_cred_info->caddr, 1);
+    copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr);
+
+    krb5_free_creds (context, out_creds);
+
+    /* encode EncKrbCredPart */
+
+    ASN1_MALLOC_ENCODE(EncKrbCredPart, buf, buf_size, 
+		       &enc_krb_cred_part, &len, ret);
+    free_EncKrbCredPart (&enc_krb_cred_part);
+    if (ret) {
+	free_KRB_CRED(&cred);
+	return ret;
+    }
+    if(buf_size != len)
+	krb5_abortx(context, "internal error in ASN.1 encoder");
+
+    if (auth_context->flags & KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED) {
+	cred.enc_part.etype = ENCTYPE_NULL;
+	cred.enc_part.kvno = NULL;
+	cred.enc_part.cipher.data = buf;
+	cred.enc_part.cipher.length = buf_size;
+    } else {
+	krb5_keyblock *key;
+
+	if (auth_context->local_subkey)
+	    key = auth_context->local_subkey;
+	else if (auth_context->remote_subkey)
+	    key = auth_context->remote_subkey;
+	else
+	    key = auth_context->keyblock;
+	
+	ret = krb5_crypto_init(context, key, 0, &crypto);
+	if (ret) {
+	    free(buf);
+	    free_KRB_CRED(&cred);
+	    return ret;
+	}
+	ret = krb5_encrypt_EncryptedData (context,
+					  crypto,
+					  KRB5_KU_KRB_CRED,
+					  buf,
+					  len,
+					  0,
+					  &cred.enc_part);
+	free(buf);
+	krb5_crypto_destroy(context, crypto);
+	if (ret) {
+	    free_KRB_CRED(&cred);
+	    return ret;
+	}
+    }
+
+    ASN1_MALLOC_ENCODE(KRB_CRED, buf, buf_size, &cred, &len, ret);
+    free_KRB_CRED (&cred);
+    if (ret)
+	return ret;
+    if(buf_size != len)
+	krb5_abortx(context, "internal error in ASN.1 encoder");
+    out_data->length = len;
+    out_data->data   = buf;
+    return 0;
+ out4:
+    free_EncKrbCredPart(&enc_krb_cred_part);
+ out3:
+    free_KRB_CRED(&cred);
+ out2:
+    krb5_free_creds (context, out_creds);
+    return ret;
+}