Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 204 insertions, 0 deletions

diff --git a/src/util/dict_unix.c b/src/util/dict_unix.c
new file mode 100644
index 0000000..4635344
--- /dev/null
+++ b/src/util/dict_unix.c
@@ -0,0 +1,204 @@
+/*++
+/* NAME
+/*	dict_unix 3
+/* SUMMARY
+/*	dictionary manager interface to UNIX tables
+/* SYNOPSIS
+/*	#include <dict_unix.h>
+/*
+/*	DICT	*dict_unix_open(map, dummy, dict_flags)
+/*	const char *map;
+/*	int	dummy;
+/*	int	dict_flags;
+/* DESCRIPTION
+/*	dict_unix_open() makes the specified UNIX table accessible via
+/*	the generic dictionary operations described in dict_open(3).
+/*	The \fIdummy\fR argument is not used.
+/*
+/*	Known map names:
+/* .IP passwd.byname
+/*	The table is the UNIX password database. The key is a login name.
+/*	The result is a password file entry in passwd(5) format.
+/* .IP group.byname
+/*	The table is the UNIX group database. The key is a group name.
+/*	The result is a group file entry in group(5) format.
+/* SEE ALSO
+/*	dict(3) generic dictionary manager
+/* DIAGNOSTICS
+/*	Fatal errors: out of memory, unknown map name, attempt to update map.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <pwd.h>
+#include <grp.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "mymalloc.h"
+#include "vstring.h"
+#include "stringops.h"
+#include "dict.h"
+#include "dict_unix.h"
+
+/* Application-specific. */
+
+typedef struct {
+    DICT    dict;			/* generic members */
+} DICT_UNIX;
+
+/* dict_unix_getpwnam - find password table entry */
+
+static const char *dict_unix_getpwnam(DICT *dict, const char *key)
+{
+    struct passwd *pwd;
+    static VSTRING *buf;
+    static int sanity_checked;
+
+    dict->error = 0;
+
+    /*
+     * Optionally fold the key.
+     */
+    if (dict->flags & DICT_FLAG_FOLD_FIX) {
+	if (dict->fold_buf == 0)
+	    dict->fold_buf = vstring_alloc(10);
+	vstring_strcpy(dict->fold_buf, key);
+	key = lowercase(vstring_str(dict->fold_buf));
+    }
+    if ((pwd = getpwnam(key)) == 0) {
+	if (sanity_checked == 0) {
+	    sanity_checked = 1;
+	    errno = 0;
+	    if (getpwuid(0) == 0) {
+		msg_warn("cannot access UNIX password database: %m");
+		dict->error = DICT_ERR_RETRY;
+	    }
+	}
+	return (0);
+    } else {
+	if (buf == 0)
+	    buf = vstring_alloc(10);
+	sanity_checked = 1;
+	vstring_sprintf(buf, "%s:%s:%ld:%ld:%s:%s:%s",
+			pwd->pw_name, pwd->pw_passwd, (long) pwd->pw_uid,
+			(long) pwd->pw_gid, pwd->pw_gecos, pwd->pw_dir,
+			pwd->pw_shell);
+	return (vstring_str(buf));
+    }
+}
+
+/* dict_unix_getgrnam - find group table entry */
+
+static const char *dict_unix_getgrnam(DICT *dict, const char *key)
+{
+    struct group *grp;
+    static VSTRING *buf;
+    char  **cpp;
+    static int sanity_checked;
+
+    dict->error = 0;
+
+    /*
+     * Optionally fold the key.
+     */
+    if (dict->flags & DICT_FLAG_FOLD_FIX) {
+	if (dict->fold_buf == 0)
+	    dict->fold_buf = vstring_alloc(10);
+	vstring_strcpy(dict->fold_buf, key);
+	key = lowercase(vstring_str(dict->fold_buf));
+    }
+    if ((grp = getgrnam(key)) == 0) {
+	if (sanity_checked == 0) {
+	    sanity_checked = 1;
+	    errno = 0;
+	    if (getgrgid(0) == 0) {
+		msg_warn("cannot access UNIX group database: %m");
+		dict->error = DICT_ERR_RETRY;
+	    }
+	}
+	return (0);
+    } else {
+	if (buf == 0)
+	    buf = vstring_alloc(10);
+	sanity_checked = 1;
+	vstring_sprintf(buf, "%s:%s:%ld:",
+			grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);
+	for (cpp = grp->gr_mem; *cpp; cpp++) {
+	    vstring_strcat(buf, *cpp);
+	    if (cpp[1])
+		VSTRING_ADDCH(buf, ',');
+	}
+	VSTRING_TERMINATE(buf);
+	return (vstring_str(buf));
+    }
+}
+
+/* dict_unix_close - close UNIX map */
+
+static void dict_unix_close(DICT *dict)
+{
+    if (dict->fold_buf)
+	vstring_free(dict->fold_buf);
+    dict_free(dict);
+}
+
+/* dict_unix_open - open UNIX map */
+
+DICT   *dict_unix_open(const char *map, int open_flags, int dict_flags)
+{
+    DICT_UNIX *dict_unix;
+    struct dict_unix_lookup {
+	char   *name;
+	const char *(*lookup) (DICT *, const char *);
+    };
+    static struct dict_unix_lookup dict_unix_lookup[] = {
+	"passwd.byname", dict_unix_getpwnam,
+	"group.byname", dict_unix_getgrnam,
+	0,
+    };
+    struct dict_unix_lookup *lp;
+
+    /*
+     * Sanity checks.
+     */
+    if (open_flags != O_RDONLY)
+	return (dict_surrogate(DICT_TYPE_UNIX, map, open_flags, dict_flags,
+			       "%s:%s map requires O_RDONLY access mode",
+			       DICT_TYPE_UNIX, map));
+
+    /*
+     * "Open" the database.
+     */
+    for (lp = dict_unix_lookup; /* void */ ; lp++) {
+	if (lp->name == 0)
+	    return (dict_surrogate(DICT_TYPE_UNIX, map, open_flags, dict_flags,
+			      "unknown table: %s:%s", DICT_TYPE_UNIX, map));
+	if (strcmp(map, lp->name) == 0)
+	    break;
+    }
+    dict_unix = (DICT_UNIX *) dict_alloc(DICT_TYPE_UNIX, map,
+					 sizeof(*dict_unix));
+    dict_unix->dict.lookup = lp->lookup;
+    dict_unix->dict.close = dict_unix_close;
+    dict_unix->dict.flags = dict_flags | DICT_FLAG_FIXED;
+    if (dict_flags & DICT_FLAG_FOLD_FIX)
+	dict_unix->dict.fold_buf = vstring_alloc(10);
+    dict_unix->dict.owner.status = DICT_OWNER_TRUSTED;
+
+    return (DICT_DEBUG (&dict_unix->dict));
+}