r10596: Move the credentials code into it's own subsystem, and push it under auth/

Andrew Bartlett
(This used to be commit 2e76a4b8efd59c496d64241d654538d3222545c6)

1 files changed, 293 insertions, 0 deletions

diff --git a/source4/auth/credentials/credentials_files.c b/source4/auth/credentials/credentials_files.c
new file mode 100644
index 0000000000..353ff61720
--- /dev/null
+++ b/source4/auth/credentials/credentials_files.c
@@ -0,0 +1,293 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   User credentials handling (as regards on-disk files)
+
+   Copyright (C) Jelmer Vernooij 2005
+   Copyright (C) Tim Potter 2001
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "lib/ldb/include/ldb.h"
+#include "librpc/gen_ndr/ndr_samr.h" /* for struct samrPassword */
+#include "include/secrets.h"
+#include "system/filesys.h"
+
+/**
+ * Read a file descriptor, and parse it for a password (eg from a file or stdin)
+ *
+ * @param credentials Credentials structure on which to set the password
+ * @param fd open file descriptor to read the password from 
+ * @param obtained This enum describes how 'specified' this password is
+ */
+
+BOOL cli_credentials_parse_password_fd(struct cli_credentials *credentials, 
+				       int fd, enum credentials_obtained obtained)
+{
+	char *p;
+	char pass[128];
+
+	for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
+		p && p - pass < sizeof(pass);) {
+		switch (read(fd, p, 1)) {
+		case 1:
+			if (*p != '\n' && *p != '\0') {
+				*++p = '\0'; /* advance p, and null-terminate pass */
+				break;
+			}
+		case 0:
+			if (p - pass) {
+				*p = '\0'; /* null-terminate it, just in case... */
+				p = NULL; /* then force the loop condition to become false */
+				break;
+			} else {
+				fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
+				return False;
+			}
+
+		default:
+			fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
+					fd, strerror(errno));
+			return False;
+		}
+	}
+
+	cli_credentials_set_password(credentials, pass, obtained);
+	return True;
+}
+
+/**
+ * Read a named file, and parse it for a password
+ *
+ * @param credentials Credentials structure on which to set the password
+ * @param file a named file to read the password from 
+ * @param obtained This enum describes how 'specified' this password is
+ */
+
+BOOL cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
+{
+	int fd = open(file, O_RDONLY, 0);
+	BOOL ret;
+
+	if (fd < 0) {
+		fprintf(stderr, "Error opening PASSWD_FILE %s: %s\n",
+				file, strerror(errno));
+		return False;
+	}
+
+	ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
+
+	close(fd);
+	
+	return ret;
+}
+
+/**
+ * Read a named file, and parse it for username, domain, realm and password
+ *
+ * @param credentials Credentials structure on which to set the password
+ * @param file a named file to read the details from 
+ * @param obtained This enum describes how 'specified' this password is
+ */
+
+BOOL cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained) 
+{
+	uint16_t len = 0;
+	char *ptr, *val, *param;
+	char **lines;
+	int i, numlines;
+
+	lines = file_lines_load(file, &numlines, NULL);
+
+	if (lines == NULL)
+	{
+		/* fail if we can't open the credentials file */
+		d_printf("ERROR: Unable to open credentials file!\n");
+		return False;
+	}
+
+	for (i = 0; i < numlines; i++) {
+		len = strlen(lines[i]);
+
+		if (len == 0)
+			continue;
+
+		/* break up the line into parameter & value.
+		 * will need to eat a little whitespace possibly */
+		param = lines[i];
+		if (!(ptr = strchr_m (lines[i], '=')))
+			continue;
+
+		val = ptr+1;
+		*ptr = '\0';
+
+		/* eat leading white space */
+		while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
+			val++;
+
+		if (strwicmp("password", param) == 0) {
+			cli_credentials_set_password(cred, val, obtained);
+		} else if (strwicmp("username", param) == 0) {
+			cli_credentials_set_username(cred, val, obtained);
+		} else if (strwicmp("domain", param) == 0) {
+			cli_credentials_set_domain(cred, val, obtained);
+		} else if (strwicmp("realm", param) == 0) {
+			cli_credentials_set_realm(cred, val, obtained);
+		}
+		memset(lines[i], 0, len);
+	}
+
+	talloc_free(lines);
+
+	return True;
+}
+
+
+/**
+ * Fill in credentials for the machine trust account, from the secrets database.
+ * 
+ * @param cred Credentials structure to fill in
+ * @retval NTSTATUS error detailing any failure
+ */
+NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred)
+{
+	TALLOC_CTX *mem_ctx;
+	
+	struct ldb_context *ldb;
+	int ldb_ret;
+	struct ldb_message **msgs;
+	const char *attrs[] = {
+		"secret",
+		"samAccountName",
+		"flatname",
+		"realm",
+		"secureChannelType",
+		"ntPwdHash",
+		"msDS-KeyVersionNumber",
+		NULL
+	};
+	
+	const char *machine_account;
+	const char *password;
+	const char *domain;
+	const char *realm;
+	enum netr_SchannelType sct;
+	
+	/* ok, we are going to get it now, don't recurse back here */
+	cred->machine_account_pending = False;
+
+	mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password");
+	/* Local secrets are stored in secrets.ldb */
+	ldb = secrets_db_connect(mem_ctx);
+	if (!ldb) {
+		DEBUG(1, ("Could not open secrets.ldb\n"));
+		return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+	}
+
+	/* search for the secret record */
+	ldb_ret = gendb_search(ldb,
+			       mem_ctx, ldb_dn_explode(mem_ctx, SECRETS_PRIMARY_DOMAIN_DN), 
+			       &msgs, attrs,
+			       SECRETS_PRIMARY_DOMAIN_FILTER, 
+			       cli_credentials_get_domain(cred));
+	if (ldb_ret == 0) {
+		DEBUG(1, ("Could not find join record to domain: %s\n",
+			  cli_credentials_get_domain(cred)));
+		talloc_free(mem_ctx);
+		return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+	} else if (ldb_ret != 1) {
+		DEBUG(1, ("Found more than one (%d) join records to domain: %s\n",
+			  ldb_ret, cli_credentials_get_domain(cred)));
+		talloc_free(mem_ctx);
+		return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+	}
+	
+	password = ldb_msg_find_string(msgs[0], "secret", NULL);
+
+	machine_account = ldb_msg_find_string(msgs[0], "samAccountName", NULL);
+
+	if (!machine_account) {
+		DEBUG(1, ("Could not find 'samAccountName' in join record to domain: %s\n",
+			  cli_credentials_get_domain(cred)));
+		talloc_free(mem_ctx);
+		return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+	}
+	
+	sct = ldb_msg_find_int(msgs[0], "secureChannelType", 0);
+	if (!sct) { 
+		DEBUG(1, ("Domain join for acocunt %s did not have a secureChannelType set!\n",
+			  machine_account));
+		return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+	}
+	
+	if (!password) {
+		const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "ntPwdHash");
+		struct samr_Password hash;
+		ZERO_STRUCT(hash);
+		if (nt_password_hash) {
+			memcpy(hash.hash, nt_password_hash->data, 
+			       MIN(nt_password_hash->length, sizeof(hash.hash)));
+		
+			cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
+		} else {
+		
+			DEBUG(1, ("Could not find 'secret' in join record to domain: %s\n",
+				  cli_credentials_get_domain(cred)));
+			talloc_free(mem_ctx);
+			return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
+		}
+	}
+	
+	cli_credentials_set_secure_channel_type(cred, sct);
+
+	domain = ldb_msg_find_string(msgs[0], "flatname", NULL);
+	if (domain) {
+		cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
+	}
+
+	realm = ldb_msg_find_string(msgs[0], "realm", NULL);
+	if (realm) {
+		cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
+	}
+
+	cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
+	if (password) {
+		cli_credentials_set_password(cred, password, CRED_SPECIFIED);
+	}
+
+	cli_credentials_set_kvno(cred, ldb_msg_find_int(msgs[0], "msDS-KeyVersionNumber", 0));
+	
+	talloc_free(mem_ctx);
+	
+	return NT_STATUS_OK;
+}
+
+/**
+ * Ask that when required, the credentials system will be filled with
+ * machine trust account, from the secrets database.
+ * 
+ * @param cred Credentials structure to fill in
+ * @note This function is used to call the above function after, rather 
+ *       than during, popt processing.
+ *
+ */
+void cli_credentials_set_machine_account_pending(struct cli_credentials *cred)
+{
+	cred->machine_account_pending = True;
+}
+