Global system config parser started.

CMakeLists.txt

@@ -48,7 +48,8 @@ INCLUDE_DIRECTORIES(${PAM_INCLUDE_DIR})
 #	src/state.c src/print.c src/passcards.c)
 
 ADD_LIBRARY(libotp SHARED libotp/crypto.c libotp/num.c libotp/ppp.c 
-	libotp/state.c libotp/print.c libotp/passcards.c)
+	libotp/state.c libotp/print.c libotp/passcards.c
+	libotp/config.c)
 
 # As other targets require this include directory...
 INCLUDE_DIRECTORIES(libotp/)

libotp/config.c

@@ -0,0 +1,187 @@
+/**********************************************************************
+ * otpasswd -- One-time password manager and PAM module.
+ * Copyright (C) 2009 by Tomasz bla Fortuna <bla@thera.be>
+ *
+ * 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 3 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 otpasswd. If not, see <http://www.gnu.org/licenses/>.
+ **********************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+
+#include "print.h"
+#include "config.h"
+
+int config_parse(options *opt, const char *config_path)
+{
+	int retval = 1;
+	int line_count = 0;
+	FILE *f;
+
+	char line_buf[CONFIG_MAX_LINE_LEN];
+
+	if (config_path) {
+		f = fopen(config_path, "r");
+	} else {
+		f = fopen(CONFIG_PATH, "r");
+	}
+
+	if (!f) {
+		print_perror(PRINT_ERROR, "Unable to open config file!\n");
+		return 1;
+	}
+
+	do {
+		char *last_char = line_buf + sizeof(line_buf) - 2;
+		/* Mark the end of line */
+		*last_char = '\0';
+
+		/* Read line */
+		if (fgets(line_buf, sizeof(line_buf), f) == NULL)
+			break;
+
+		/* Check line too long condition */
+		if (*last_char != '\n' || *last_char != '\0') {
+			print(PRINT_ERROR, "Line in config file to long");
+			goto error;
+		}
+
+		line_count++;
+
+		/* Omit comments */
+		if (line_buf[0] == '#')
+			continue;
+
+		/* Omit all-whitespace */
+		char *ptr = line_buf;
+		for (; *ptr != '\0' && *ptr == '\n' && *ptr != ' ' &&
+			*ptr != '\t'; ptr++);
+
+		if (*ptr == '\0') {
+			/* We got to the end of line - it's all whitespace.
+			 * Omit it */
+			continue;
+		}
+
+		/* Find = */
+		char *equality = strchr(line_buf, '=');
+
+		if (!equality) {
+			print(PRINT_ERROR, "Syntax error on line %d in config file.", 
+			      line_count);
+			goto error;
+		}
+
+		/* After those two lines equality points to the start
+		 * of argument, and buf_line to the name of variable
+		 * we are setting (nul-terminated)
+		 */
+		*equality = '\0';
+		equality++;
+
+		/* Try to parse argument as int */
+		int arg;
+		int arg_state = sscanf(equality, "%d", &arg);
+
+		/* Helper macro to ensure all parameters
+		 * have correct values */
+#define REQUIRE_ARG(from, to)					\
+	do {							\
+		if (arg_state != 1) {				\
+			print(PRINT_ERROR,			\
+			      "Unable to parse int argument"	\
+			      " in config at line %d\n",	\
+			      line_count);			\
+			goto error;				\
+		}						\
+		if (arg < (from) || arg > (to)) {		\
+			print(PRINT_ERROR,			\
+			      "Number argument (%d) out of"	\
+			      " range (%d;%d) in config "	\
+			      "at line %d.\n",			\
+			      arg, from, to, line_count);	\
+			goto error;				\
+		}						\
+	} while (0)
+
+
+		if (strcasecmp(line_buf, "show") == 0) {
+			REQUIRE_ARG(1,3);
+			opt->show = arg;
+		} else if (strcasecmp(line_buf, "enforce") == 0) {
+			REQUIRE_ARG(0, 1);
+			opt->enforce = arg;
+		} else if (strcasecmp(line_buf, "retry") == 0) {
+			REQUIRE_ARG(0, 3);
+			opt->retry = arg;
+		} else if (strcasecmp(line_buf, "debug") == 0) {
+			REQUIRE_ARG(0, 1);
+			opt->debug = arg;
+		} else if (strcasecmp(line_buf, "oob") == 0) {
+			REQUIRE_ARG(0, 2);
+			opt->oob = arg;
+		} else if (strcasecmp(line_buf, "oob_path") == 0) {
+		} else if (strcasecmp(line_buf, "uid") == 0) {
+			REQUIRE_ARG(0, 9999999);
+			opt->uid = arg;
+		} else if (strcasecmp(line_buf, "gid") == 0) {
+			REQUIRE_ARG(0, 9999999);
+			opt->gid = arg;
+		} else if (strcasecmp(line_buf, "use_global_db") == 0) {
+			REQUIRE_ARG(0, 1);
+			opt->use_global_db = arg;
+		} else if (strcasecmp(line_buf, "global_db") == 0) {
+		} else if (strcasecmp(line_buf, "user_db") == 0) {
+		} else if (strcasecmp(line_buf, "allow_skipping") == 0) {
+			REQUIRE_ARG(0, 1);
+			opt->allow_skipping = arg;
+		} else if (strcasecmp(line_buf, "allow_passode_print") == 0) {
+			REQUIRE_ARG(0, 1);
+			opt->allow_passcode_print = arg;
+		} else if (strcasecmp(line_buf, "allow_key_print") == 0) {
+			REQUIRE_ARG(0, 1);
+			opt->allow_key_print = arg;
+		} else if (strcasecmp(line_buf, "allow_key_generation") == 0) {
+			REQUIRE_ARG(0, 1);
+			opt->allow_key_generation = arg;
+		} else if (strcasecmp(line_buf, "min_passcode_length") == 0) {
+			REQUIRE_ARG(2, 16);
+			opt->min_passcode_length = arg;
+		} else if (strcasecmp(line_buf, "max_passcode_length") == 0) {
+			REQUIRE_ARG(2, 16);
+			opt->max_passcode_length = arg;
+		} else if (strcasecmp(line_buf, "min_alphabet_length") == 0) {
+			REQUIRE_ARG(64, 88);
+			opt->min_alphabet_length = arg;
+		} else if (strcasecmp(line_buf, "max_alphabet_length") == 0) {
+			REQUIRE_ARG(64, 88);
+			opt->max_alphabet_length = arg;
+		} else if (strcasecmp(line_buf, "salt") == 0) {
+			REQUIRE_ARG(0, 2);
+			opt->salt = arg;
+		} else {
+			/* Error */
+			print(PRINT_ERROR, "Unrecognized variable on line %d in config file\n",
+			      line_count);
+		}
+
+	} while (!feof(f));
+
+	/* All ok */
+	retval = 0;
+error:
+	fclose(f);
+	return retval;
+}
+
+

libotp/config.h

@@ -0,0 +1,112 @@
+/**********************************************************************
+ * otpasswd -- One-time password manager and PAM module.
+ * Copyright (C) 2009 by Tomasz bla Fortuna <bla@thera.be>
+ *
+ * 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 3 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 otpasswd. If not, see <http://www.gnu.org/licenses/>.
+ **********************************************************************/
+
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+#define CONFIG_PATH		"/etc/security/otpasswd.conf"
+#define CONFIG_MAX_LINE_LEN	260
+#define CONFIG_DEF_DB_GLOBAL	"/etc/otshadow"
+#define CONFIG_DEF_DB_USER	".otpasswd"
+#define CONFIG_PATH_LEN		200
+
+typedef struct {
+	/*** 
+	 * General configuration 
+	 ***/
+
+	int use_global_db;
+
+	/* Location of global database file */
+	char global_db_path[CONFIG_PATH_LEN];
+
+	/* Location of user database file */
+	char user_db_path[CONFIG_PATH_LEN];
+
+	/***
+	 * PAM Configuration
+	 ***/
+
+	/* Enforced makes any user without key
+	 * fail to login */
+	int enforce;
+
+	/* Do we allow dont-skip? 0 - yes */
+	int secure;
+
+	/* Turns on increased debugging (into syslog) */
+	int debug;
+
+	/* 0 - no retry
+	 * 1 - retry with new passcode
+	 * 2 - retry with the same passcode
+	 * Will always retry 3 times...
+	 */
+	int retry;
+
+	/* Shall we echo entered passcode?
+	 * 1 - user selected
+	 * 0 - (noshow) echo disabled
+	 * 2 - (show) echo enabled
+	 */
+	int show;
+
+	/* 0 - OOB disabled
+	 * 1 - OOB on request
+	 * 2 - OOB on request; request requires password
+	 * 3 - OOB sent during all authentication sessions
+	 */
+	int oob;
+
+	/* Out-Of-Band script path */
+	/* Ensure that size of this field matches sscanf in _parse_options */
+	char oob_path[CONFIG_PATH_LEN];
+
+	/* Parameters determined from the environment and
+	 * not options themselves  */
+	int uid, gid; /* uid, gid of a safe, non-root user who can run OOB script */
+
+	/***
+	 * Policy configuration
+	 ***/
+	/* Implemented */
+
+	/* Not-implemented */
+	int allow_key_generation;
+	int allow_skipping;
+	int allow_passcode_print;
+	int allow_key_print;
+	int min_passcode_length;
+	int max_passcode_length;
+	int min_alphabet_length;
+	int max_alphabet_length;
+	int salt;
+} options;
+
+/* Set all fields to default values */
+extern void config_defaults(options *opt);
+
+/* Parse config file and set fields in struct 
+ * config_path might be NULL to read default config.
+ */ppp
+extern int config_parse(options *opt, const char *config_path);
+
+
+
+
+#endif

utility/otpasswd.c

@@ -90,7 +90,7 @@ static void _usage(int argc, const char **argv)
 		"                                 from 2 to 16 (default: codelength-4)\n"
 		"               list              print current state data\n"
 		"  -p, --password <pass>\n"
-		"               Set static password.\n"
+		"               Set static password. Use empty (i.e. "") to unset.\n"
 		"  -c, --contact <arg>\n"
 		"               Set a contact info (e.g. phone number) with which\n"
 		"               you want to receive current passcode during authentication.\n"