ITS#7284 slappasswd: Add support loading a dynamically loadable module

Add "-o module-path=<pathspec>" and "-o module-load=<filename>"
options to load a dynamically loadable password hash module
(e.g., slapd-sha2).

doc/man/man8/slappasswd.8

@@ -18,7 +18,8 @@ slappasswd \- OpenLDAP password utility
 .BI \-c \ salt-format\fR]
 [\c
 .BR \-n ]
-.B 
+[\c
+.BI \-o \ option\fR[ = value\fR]]
 .LP
 .SH DESCRIPTION
 .LP
@@ -154,6 +155,21 @@ which provides 31 characters of salt.
 .BI \-n
 Omit the trailing newline; useful to pipe the credentials
 into a command.
+.TP
+.BI \-o \ option\fR[ = value\fR]
+Specify an
+.I option
+with a(n optional)
+.IR value .
+Possible generic options/values are:
+.LP
+.nf
+              module\-path=<pathspec> (see `\fBmodulepath\fP' in slapd.conf(5))
+              module\-load=<filename> (see `\fBmoduleload\fP' in slapd.conf(5))
+
+.in
+You can load a dynamically loadable password hash module by
+using this option.
 .SH LIMITATIONS
 The practice of storing hashed passwords in userPassword violates
 Standard Track (RFC 4519) schema specifications and may hinder

servers/slapd/slappasswd.c

@@ -40,6 +40,8 @@
 #include "slap.h"
 
 static int	verbose = 0;
+static char	*modulepath = NULL;
+static char	*moduleload = NULL;
 
 static void
 usage(const char *s)
@@ -50,6 +52,9 @@ usage(const char *s)
 		"  -g\t\tgenerate random password\n"
 		"  -h hash\tpassword scheme\n"
 		"  -n\t\tomit trailing newline\n"
+		"  -o <opt>[=val] specify an option with a(n optional) value\n"
+		"  \tmodule-path=<pathspec>\n"
+		"  \tmodule-load=<filename>\n"
 		"  -s secret\tnew password\n"
 		"  -u\t\tgenerate RFC2307 values (default)\n"
 		"  -v\t\tincrease verbosity\n"
@@ -59,9 +64,39 @@ usage(const char *s)
 	exit( EXIT_FAILURE );
 }
 
+static int
+parse_slappasswdopt( void )
+{
+	size_t	len = 0;
+	char	*p;
+
+	p = strchr( optarg, '=' );
+	if ( p != NULL ) {
+		len = p - optarg;
+		p++;
+	}
+
+	if ( strncasecmp( optarg, "module-path", len ) == 0 ) {
+		if ( modulepath )
+			ch_free( modulepath );
+		modulepath = ch_strdup( p );
+
+	} else if ( strncasecmp( optarg, "module-load", len ) == 0 ) {
+		if ( moduleload )
+			ch_free( moduleload );
+		moduleload = ch_strdup( p );
+
+	} else {
+		return -1;
+	}
+
+	return 0;
+}
+
 int
 slappasswd( int argc, char *argv[] )
 {
+	int rc = EXIT_SUCCESS;
 #ifdef LUTIL_SHA1_BYTES
 	char	*default_scheme = "{SSHA}";
 #else
@@ -79,8 +114,15 @@ slappasswd( int argc, char *argv[] )
 	struct berval passwd = BER_BVNULL;
 	struct berval hash;
 
+#ifdef LDAP_DEBUG
+	/* tools default to "none", so that at least LDAP_DEBUG_ANY
+	 * messages show up; use -d 0 to reset */
+	slap_debug = LDAP_DEBUG_NONE;
+#endif
+	ldap_syslog = 0;
+
 	while( (i = getopt( argc, argv,
-		"c:d:gh:ns:T:vu" )) != EOF )
+		"c:d:gh:no:s:T:vu" )) != EOF )
 	{
 		switch (i) {
 		case 'c':	/* crypt salt format */
@@ -117,6 +159,12 @@ slappasswd( int argc, char *argv[] )
 			newline = "";
 			break;
 
+		case 'o':
+			if ( parse_slappasswdopt() ) {
+				usage ( progname );
+			}
+			break;
+
 		case 's':	/* new password (secret) */
 			if ( pwfile != NULL ) {
 				fprintf( stderr, "Option -s incompatible with -T\n" );
@@ -163,11 +211,29 @@ slappasswd( int argc, char *argv[] )
 
 	if( argc - optind != 0 ) {
 		usage( progname );
-	} 
+	}
+
+#ifdef SLAPD_MODULES
+	if ( module_init() != 0 ) {
+		fprintf( stderr, "%s: module_init failed\n", progname );
+		return EXIT_FAILURE;
+	}
+
+	if ( modulepath && module_path(modulepath) ) {
+		rc = EXIT_FAILURE;
+		goto destroy;
+	}
+
+	if ( moduleload && module_load(moduleload, 0, NULL) ) {
+		rc = EXIT_FAILURE;
+		goto destroy;
+	}
+#endif
 
 	if( pwfile != NULL ) {
 		if( lutil_get_filed_password( pwfile, &passwd )) {
-			return EXIT_FAILURE;
+			rc = EXIT_FAILURE;
+			goto destroy;
 		}
 	} else if ( BER_BVISEMPTY( &passwd )) {
 		if( newpw == NULL ) {
@@ -178,7 +244,8 @@ slappasswd( int argc, char *argv[] )
 	
 			if( strcmp( newpw, cknewpw )) {
 				fprintf( stderr, "Password values do not match\n" );
-				return EXIT_FAILURE;
+				rc = EXIT_FAILURE;
+				goto destroy;
 			}
 		}
 
@@ -194,16 +261,24 @@ slappasswd( int argc, char *argv[] )
 		fprintf( stderr,
 			"Password generation failed for scheme %s: %s\n",
 			scheme, text ? text : "" );
-		return EXIT_FAILURE;
+		rc = EXIT_FAILURE;
+		goto destroy;
 	}
 
 	if( lutil_passwd( &hash, &passwd, NULL, &text ) ) {
 		fprintf( stderr, "Password verification failed. %s\n",
 			text ? text : "" );
-		return EXIT_FAILURE;
+		rc = EXIT_FAILURE;
+		goto destroy;
 	}
 
 print_pw:;
 	printf( "%s%s" , hash.bv_val, newline );
-	return EXIT_SUCCESS;
+
+destroy:;
+#ifdef SLAPD_MODULES
+	module_kill();
+#endif
+
+	return rc;
 }