r8302: import mini HEIMDAL into the tree

(This used to be commit 118be28a7aef233799956615a99d1a2a74dac175)

1 files changed, 443 insertions, 0 deletions

diff --git a/source4/heimdal/lib/krb5/keytab_krb4.c b/source4/heimdal/lib/krb5/keytab_krb4.c
new file mode 100644
index 0000000000..1a83faca57
--- /dev/null
+++ b/source4/heimdal/lib/krb5/keytab_krb4.c
@@ -0,0 +1,443 @@
+/*
+ * Copyright (c) 1997 - 2002 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: keytab_krb4.c,v 1.13 2005/05/19 04:13:18 lha Exp $");
+
+struct krb4_kt_data {
+    char *filename;
+};
+
+static krb5_error_code
+krb4_kt_resolve(krb5_context context, const char *name, krb5_keytab id)
+{
+    struct krb4_kt_data *d;
+
+    d = malloc (sizeof(*d));
+    if (d == NULL) {
+	krb5_set_error_string (context, "malloc: out of memory");
+	return ENOMEM;
+    }
+    d->filename = strdup (name);
+    if (d->filename == NULL) {
+	free(d);
+	krb5_set_error_string (context, "malloc: out of memory");
+	return ENOMEM;
+    }
+    id->data = d;
+    return 0;
+}
+
+static krb5_error_code
+krb4_kt_get_name (krb5_context context,
+		  krb5_keytab id,
+		  char *name,
+		  size_t name_sz)
+{
+    struct krb4_kt_data *d = id->data;
+
+    strlcpy (name, d->filename, name_sz);
+    return 0;
+}
+
+static krb5_error_code
+krb4_kt_close (krb5_context context,
+	       krb5_keytab id)
+{
+    struct krb4_kt_data *d = id->data;
+
+    free (d->filename);
+    free (d);
+    return 0;
+}
+
+struct krb4_cursor_extra_data {
+    krb5_keytab_entry entry;
+    int num;
+};
+
+static int
+open_flock(const char *filename, int flags, int mode)
+{
+    int lock_mode;
+    int tries = 0;
+    int fd = open(filename, flags, mode);
+    if(fd < 0)
+	return fd;
+    if((flags & O_ACCMODE) == O_RDONLY)
+	lock_mode = LOCK_SH | LOCK_NB;
+    else
+	lock_mode = LOCK_EX | LOCK_NB;
+    while(flock(fd, lock_mode) < 0) {
+	if(++tries < 5) {
+	    sleep(1);
+	} else {
+	    close(fd);
+	    return -1;
+	}
+    }
+    return fd;
+}
+
+
+
+static krb5_error_code
+krb4_kt_start_seq_get_int (krb5_context context,
+			   krb5_keytab id,
+			   int flags,
+			   krb5_kt_cursor *c)
+{
+    struct krb4_kt_data *d = id->data;
+    struct krb4_cursor_extra_data *ed;
+    int ret;
+
+    ed = malloc (sizeof(*ed));
+    if (ed == NULL) {
+	krb5_set_error_string (context, "malloc: out of memory");
+	return ENOMEM;
+    }
+    ed->entry.principal = NULL;
+    ed->num = -1;
+    c->data = ed;
+    c->fd = open_flock (d->filename, flags, 0);
+    if (c->fd < 0) {
+	ret = errno;
+	free (ed);
+	krb5_set_error_string(context, "open(%s): %s", d->filename,
+			      strerror(ret));
+	return ret;
+    }
+    c->sp = krb5_storage_from_fd(c->fd);
+    krb5_storage_set_eof_code(c->sp, KRB5_KT_END);
+    return 0;
+}
+
+static krb5_error_code
+krb4_kt_start_seq_get (krb5_context context,
+		       krb5_keytab id,
+		       krb5_kt_cursor *c)
+{
+    return krb4_kt_start_seq_get_int (context, id, O_BINARY | O_RDONLY, c);
+}
+
+static krb5_error_code
+read_v4_entry (krb5_context context,
+	       struct krb4_kt_data *d,
+	       krb5_kt_cursor *c,
+	       struct krb4_cursor_extra_data *ed)
+{
+    unsigned char des_key[8];
+    krb5_error_code ret;
+    char *service, *instance, *realm;
+    int8_t kvno;
+
+    ret = krb5_ret_stringz(c->sp, &service);
+    if (ret)
+	return ret;
+    ret = krb5_ret_stringz(c->sp, &instance);
+    if (ret) {
+	free (service);
+	return ret;
+    }
+    ret = krb5_ret_stringz(c->sp, &realm);
+    if (ret) {
+	free (service);
+	free (instance);
+	return ret;
+    }
+    ret = krb5_425_conv_principal (context, service, instance, realm,
+				   &ed->entry.principal);
+    free (service);
+    free (instance);
+    free (realm);
+    if (ret)
+	return ret;
+    ret = krb5_ret_int8(c->sp, &kvno);
+    if (ret) {
+	krb5_free_principal (context, ed->entry.principal);
+	return ret;
+    }
+    ret = krb5_storage_read(c->sp, des_key, sizeof(des_key));
+    if (ret < 0) {
+	krb5_free_principal(context, ed->entry.principal);
+	return ret;
+    }
+    if (ret < 8) {
+	krb5_free_principal(context, ed->entry.principal);
+	return EINVAL;
+    }
+    ed->entry.vno = kvno;
+    ret = krb5_data_copy (&ed->entry.keyblock.keyvalue,
+			  des_key, sizeof(des_key));
+    if (ret)
+	return ret;
+    ed->entry.timestamp = time(NULL);
+    ed->num = 0;
+    return 0;
+}
+
+static krb5_error_code
+krb4_kt_next_entry (krb5_context context,
+		    krb5_keytab id,
+		    krb5_keytab_entry *entry,
+		    krb5_kt_cursor *c)
+{
+    krb5_error_code ret;
+    struct krb4_kt_data *d = id->data;
+    struct krb4_cursor_extra_data *ed = c->data;
+    const krb5_enctype keytypes[] = {ETYPE_DES_CBC_MD5,
+				     ETYPE_DES_CBC_MD4,
+				     ETYPE_DES_CBC_CRC};
+
+    if (ed->num == -1) {
+	ret = read_v4_entry (context, d, c, ed);
+	if (ret)
+	    return ret;
+    }
+    ret = krb5_kt_copy_entry_contents (context,
+				       &ed->entry,
+				       entry);
+    if (ret)
+	return ret;
+    entry->keyblock.keytype = keytypes[ed->num];
+    if (++ed->num == 3) {
+	krb5_kt_free_entry (context, &ed->entry);
+	ed->num = -1;
+    }
+    return 0;
+}
+
+static krb5_error_code
+krb4_kt_end_seq_get (krb5_context context,
+		     krb5_keytab id,
+		     krb5_kt_cursor *c)
+{
+    struct krb4_cursor_extra_data *ed = c->data;
+
+    krb5_storage_free (c->sp);
+    if (ed->num != -1)
+	krb5_kt_free_entry (context, &ed->entry);
+    free (c->data);
+    close (c->fd);
+    return 0;
+}
+
+static krb5_error_code
+krb4_store_keytab_entry(krb5_context context, 
+			krb5_keytab_entry *entry, 
+			krb5_storage *sp)
+{
+    krb5_error_code ret;
+#define ANAME_SZ 40
+#define INST_SZ 40
+#define REALM_SZ 40
+    char service[ANAME_SZ];
+    char instance[INST_SZ];
+    char realm[REALM_SZ];
+    ret = krb5_524_conv_principal (context, entry->principal,
+				   service, instance, realm);
+    if (ret)
+	return ret;
+    if (entry->keyblock.keyvalue.length == 8
+	&& entry->keyblock.keytype == ETYPE_DES_CBC_MD5) {
+	ret = krb5_store_stringz(sp, service);
+	ret = krb5_store_stringz(sp, instance);
+	ret = krb5_store_stringz(sp, realm);
+	ret = krb5_store_int8(sp, entry->vno);
+	ret = krb5_storage_write(sp, entry->keyblock.keyvalue.data, 8);
+    }
+    return 0;
+}
+
+static krb5_error_code
+krb4_kt_add_entry (krb5_context context,
+		   krb5_keytab id,
+		   krb5_keytab_entry *entry)
+{
+    struct krb4_kt_data *d = id->data;
+    krb5_storage *sp;
+    krb5_error_code ret;
+    int fd;
+
+    fd = open_flock (d->filename, O_WRONLY | O_APPEND | O_BINARY, 0);
+    if (fd < 0) {
+	fd = open_flock (d->filename,
+		   O_WRONLY | O_APPEND | O_BINARY | O_CREAT, 0600);
+	if (fd < 0) {
+	    ret = errno;
+	    krb5_set_error_string(context, "open(%s): %s", d->filename,
+				  strerror(ret));
+	    return ret;
+	}
+    }
+    sp = krb5_storage_from_fd(fd);
+    krb5_storage_set_eof_code(sp, KRB5_KT_END);
+    if(sp == NULL) {
+	close(fd);
+	return ENOMEM;
+    }
+    ret = krb4_store_keytab_entry(context, entry, sp);
+    krb5_storage_free(sp);
+    if(close (fd) < 0)
+	return errno;
+    return ret;
+}
+
+static krb5_error_code
+krb4_kt_remove_entry(krb5_context context,
+		 krb5_keytab id,
+		 krb5_keytab_entry *entry)
+{
+    struct krb4_kt_data *d = id->data;
+    krb5_error_code ret;
+    krb5_keytab_entry e;
+    krb5_kt_cursor cursor;
+    krb5_storage *sp;
+    int remove_flag = 0;
+    
+    sp = krb5_storage_emem();
+    if (sp == NULL) {
+	krb5_set_error_string(context, "malloc: out of memory");
+	return ENOMEM;
+    }
+    ret = krb5_kt_start_seq_get(context, id, &cursor);
+    if (ret) {
+	krb5_storage_free(sp);
+	return ret;
+    }	
+    while(krb5_kt_next_entry(context, id, &e, &cursor) == 0) {
+	if(!krb5_kt_compare(context, &e, entry->principal, 
+			    entry->vno, entry->keyblock.keytype)) {
+	    ret = krb4_store_keytab_entry(context, &e, sp);
+	    if(ret) {
+		krb5_kt_free_entry(context, &e);
+		krb5_storage_free(sp);
+		return ret;
+	    }
+	} else
+	    remove_flag = 1;
+	krb5_kt_free_entry(context, &e);
+    }
+    krb5_kt_end_seq_get(context, id, &cursor);
+    if(remove_flag) {
+	int fd;
+	unsigned char buf[1024];
+	ssize_t n;
+	krb5_data data;
+	struct stat st;
+
+	krb5_storage_to_data(sp, &data);
+	krb5_storage_free(sp);
+
+	fd = open_flock (d->filename, O_RDWR | O_BINARY, 0);
+	if(fd < 0) {
+	    memset(data.data, 0, data.length);
+	    krb5_data_free(&data);
+	    if(errno == EACCES || errno == EROFS) 
+		return KRB5_KT_NOWRITE;
+	    return errno;
+	}
+
+	if(write(fd, data.data, data.length) != data.length) {
+	    memset(data.data, 0, data.length);
+	    krb5_data_free(&data);
+	    close(fd);
+	    krb5_set_error_string(context, "failed writing to \"%s\"", d->filename);
+	    return errno;
+	}
+	memset(data.data, 0, data.length);
+	if(fstat(fd, &st) < 0) {
+	    krb5_data_free(&data);
+	    close(fd);
+	    krb5_set_error_string(context, "failed getting size of \"%s\"", d->filename);
+	    return errno;
+	}
+	st.st_size -= data.length;
+	memset(buf, 0, sizeof(buf));
+	while(st.st_size > 0) {
+	    n = min(st.st_size, sizeof(buf));
+	    n = write(fd, buf, n);
+	    if(n <= 0) {
+		krb5_data_free(&data);
+		close(fd);
+		krb5_set_error_string(context, "failed writing to \"%s\"", d->filename);
+		return errno;
+		
+	    }
+	    st.st_size -= n;
+	}
+	if(ftruncate(fd, data.length) < 0) {
+	    krb5_data_free(&data);
+	    close(fd);
+	    krb5_set_error_string(context, "failed truncating \"%s\"", d->filename);
+	    return errno;
+	}
+	krb5_data_free(&data);
+	if(close(fd) < 0) {
+	    krb5_set_error_string(context, "error closing \"%s\"", d->filename);
+	    return errno;
+	}
+	return 0;
+    } else {
+	krb5_storage_free(sp);
+	return KRB5_KT_NOTFOUND;
+    }
+}
+
+
+const krb5_kt_ops krb4_fkt_ops = {
+    "krb4",
+    krb4_kt_resolve,
+    krb4_kt_get_name,
+    krb4_kt_close,
+    NULL,			/* get */
+    krb4_kt_start_seq_get,
+    krb4_kt_next_entry,
+    krb4_kt_end_seq_get,
+    krb4_kt_add_entry,		/* add_entry */
+    krb4_kt_remove_entry	/* remove_entry */
+};
+
+const krb5_kt_ops krb5_srvtab_fkt_ops = {
+    "SRVTAB",
+    krb4_kt_resolve,
+    krb4_kt_get_name,
+    krb4_kt_close,
+    NULL,			/* get */
+    krb4_kt_start_seq_get,
+    krb4_kt_next_entry,
+    krb4_kt_end_seq_get,
+    krb4_kt_add_entry,		/* add_entry */
+    krb4_kt_remove_entry	/* remove_entry */
+};