Adding upstream version 1.8.27.upstream/1.8.27upstream

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

1 files changed, 232 insertions, 0 deletions

diff --git a/plugins/sudoers/group_plugin.c b/plugins/sudoers/group_plugin.c
new file mode 100644
index 0000000..21d6510
--- /dev/null
+++ b/plugins/sudoers/group_plugin.c
@@ -0,0 +1,232 @@
+/*
+ * Copyright (c) 2010-2018 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <unistd.h>
+#include <time.h>
+#include <ctype.h>
+#include <errno.h>
+#include <pwd.h>
+
+#include "sudoers.h"
+#include "sudo_dso.h"
+
+#if defined(HAVE_DLOPEN) || defined(HAVE_SHL_LOAD)
+
+static void *group_handle;
+static struct sudoers_group_plugin *group_plugin;
+const char *path_plugin_dir = _PATH_SUDO_PLUGIN_DIR;
+
+/*
+ * Load the specified plugin and run its init function.
+ * Returns -1 if unable to open the plugin, else it returns
+ * the value from the plugin's init function.
+ */
+int
+group_plugin_load(char *plugin_info)
+{
+    struct stat sb;
+    char *args, path[PATH_MAX];
+    char **argv = NULL;
+    int len, rc = -1;
+    debug_decl(group_plugin_load, SUDOERS_DEBUG_UTIL)
+
+    /*
+     * Fill in .so path and split out args (if any).
+     */
+    if ((args = strpbrk(plugin_info, " \t")) != NULL) {
+	len = snprintf(path, sizeof(path), "%s%.*s",
+	    (*plugin_info != '/') ? path_plugin_dir : "",
+	    (int)(args - plugin_info), plugin_info);
+	args++;
+    } else {
+	len = snprintf(path, sizeof(path), "%s%s",
+	    (*plugin_info != '/') ? path_plugin_dir : "", plugin_info);
+    }
+    if (len <= 0 || (size_t)len >= sizeof(path)) {
+	errno = ENAMETOOLONG;
+	sudo_warn("%s%s",
+	    (*plugin_info != '/') ? path_plugin_dir : "", plugin_info);
+	goto done;
+    }
+
+    /* Sanity check plugin path. */
+    if (stat(path, &sb) != 0) {
+	sudo_warn("%s", path);
+	goto done;
+    }
+    if (sb.st_uid != ROOT_UID) {
+	sudo_warnx(U_("%s must be owned by uid %d"), path, ROOT_UID);
+	goto done;
+    }
+    if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
+	sudo_warnx(U_("%s must only be writable by owner"), path);
+	goto done;
+    }
+
+    /* Open plugin and map in symbol. */
+    group_handle = sudo_dso_load(path, SUDO_DSO_LAZY|SUDO_DSO_GLOBAL);
+    if (!group_handle) {
+	const char *errstr = sudo_dso_strerror();
+	sudo_warnx(U_("unable to load %s: %s"), path,
+	    errstr ? errstr : "unknown error");
+	goto done;
+    }
+    group_plugin = sudo_dso_findsym(group_handle, "group_plugin");
+    if (group_plugin == NULL) {
+	sudo_warnx(U_("unable to find symbol \"group_plugin\" in %s"), path);
+	goto done;
+    }
+
+    if (SUDO_API_VERSION_GET_MAJOR(group_plugin->version) != GROUP_API_VERSION_MAJOR) {
+	sudo_warnx(U_("%s: incompatible group plugin major version %d, expected %d"),
+	    path, SUDO_API_VERSION_GET_MAJOR(group_plugin->version),
+	    GROUP_API_VERSION_MAJOR);
+	goto done;
+    }
+
+    /*
+     * Split args into a vector if specified.
+     */
+    if (args != NULL) {
+	int ac = 0;
+	bool wasblank = true;
+	char *cp, *last;
+
+        for (cp = args; *cp != '\0'; cp++) {
+            if (isblank((unsigned char)*cp)) {
+                wasblank = true;
+            } else if (wasblank) {
+                wasblank = false;
+                ac++;
+            }
+        }
+	if (ac != 0) {
+	    argv = reallocarray(NULL, ac, sizeof(char *));
+	    if (argv == NULL) {
+		sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+		goto done;
+	    }
+	    ac = 0;
+	    for ((cp = strtok_r(args, " \t", &last)); cp != NULL; (cp = strtok_r(NULL, " \t", &last)))
+		argv[ac++] = cp;
+	}
+    }
+
+    rc = (group_plugin->init)(GROUP_API_VERSION, sudo_printf, argv);
+
+done:
+    free(argv);
+
+    if (rc != true) {
+	if (group_handle != NULL) {
+	    sudo_dso_unload(group_handle);
+	    group_handle = NULL;
+	    group_plugin = NULL;
+	}
+    }
+
+    debug_return_int(rc);
+}
+
+void
+group_plugin_unload(void)
+{
+    debug_decl(group_plugin_unload, SUDOERS_DEBUG_UTIL)
+
+    if (group_plugin != NULL) {
+	(group_plugin->cleanup)();
+	group_plugin = NULL;
+    }
+    if (group_handle != NULL) {
+	sudo_dso_unload(group_handle);
+	group_handle = NULL;
+    }
+    debug_return;
+}
+
+int
+group_plugin_query(const char *user, const char *group,
+    const struct passwd *pwd)
+{
+    debug_decl(group_plugin_query, SUDOERS_DEBUG_UTIL)
+
+    if (group_plugin == NULL)
+	debug_return_int(false);
+    debug_return_int((group_plugin->query)(user, group, pwd));
+}
+
+#else /* !HAVE_DLOPEN && !HAVE_SHL_LOAD */
+
+/*
+ * No loadable shared object support.
+ */
+
+int
+group_plugin_load(char *plugin_info)
+{
+    debug_decl(group_plugin_load, SUDOERS_DEBUG_UTIL)
+    debug_return_int(false);
+}
+
+void
+group_plugin_unload(void)
+{
+    debug_decl(group_plugin_unload, SUDOERS_DEBUG_UTIL)
+    debug_return;
+}
+
+int
+group_plugin_query(const char *user, const char *group,
+    const struct passwd *pwd)
+{
+    debug_decl(group_plugin_query, SUDOERS_DEBUG_UTIL)
+    debug_return_int(false);
+}
+
+#endif /* HAVE_DLOPEN || HAVE_SHL_LOAD */
+
+/*
+ * Group plugin sudoers callback.
+ */
+bool
+cb_group_plugin(const union sudo_defs_val *sd_un)
+{
+    bool rc = true;
+    debug_decl(cb_group_plugin, SUDOERS_DEBUG_PLUGIN)
+
+    /* Unload any existing group plugin before loading a new one. */
+    group_plugin_unload();
+    if (sd_un->str != NULL)
+	rc = group_plugin_load(sd_un->str);
+    debug_return_bool(rc);
+}