Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream

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

1 files changed, 264 insertions, 0 deletions

diff --git a/plugins/sudoers/sudo_nss.c b/plugins/sudoers/sudo_nss.c
new file mode 100644
index 0000000..a48bb67
--- /dev/null
+++ b/plugins/sudoers/sudo_nss.c
@@ -0,0 +1,264 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2007-2015 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <ctype.h>
+
+#include "sudoers.h"
+
+extern struct sudo_nss sudo_nss_file;
+#ifdef HAVE_LDAP
+extern struct sudo_nss sudo_nss_ldap;
+#endif
+#ifdef HAVE_SSSD
+extern struct sudo_nss sudo_nss_sss;
+#endif
+
+/* Make sure we have not already inserted the nss entry. */
+#define SUDO_NSS_CHECK_UNUSED(nss, tag)					       \
+    if (nss.entries.tqe_next != NULL || nss.entries.tqe_prev != NULL) {      \
+	sudo_warnx("internal error: nsswitch entry \"%s\" already in use",     \
+	    tag);							       \
+	continue;							       \
+    }
+
+#if (defined(HAVE_LDAP) || defined(HAVE_SSSD)) && defined(_PATH_NSSWITCH_CONF)
+/*
+ * Read in /etc/nsswitch.conf
+ * Returns a tail queue of matches.
+ */
+struct sudo_nss_list *
+sudo_read_nss(void)
+{
+    FILE *fp;
+    char *line = NULL;
+    size_t linesize = 0;
+#ifdef HAVE_SSSD
+    bool saw_sss = false;
+#endif
+#ifdef HAVE_LDAP
+    bool saw_ldap = false;
+#endif
+    bool saw_files = false;
+    bool got_match = false;
+    static struct sudo_nss_list snl = TAILQ_HEAD_INITIALIZER(snl);
+    debug_decl(sudo_read_nss, SUDOERS_DEBUG_NSS);
+
+    if ((fp = fopen(_PATH_NSSWITCH_CONF, "r")) == NULL)
+	goto nomatch;
+
+    while (sudo_parseln(&line, &linesize, NULL, fp, 0) != -1) {
+	char *cp, *last;
+
+	/* Skip blank or comment lines */
+	if (*line == '\0')
+	    continue;
+
+	/* Look for a line starting with "sudoers:" */
+	if (strncasecmp(line, "sudoers:", 8) != 0)
+	    continue;
+
+	/* Parse line */
+	for ((cp = strtok_r(line + 8, " \t", &last)); cp != NULL; (cp = strtok_r(NULL, " \t", &last))) {
+	    if (strcasecmp(cp, "files") == 0 && !saw_files) {
+		SUDO_NSS_CHECK_UNUSED(sudo_nss_file, "files");
+		TAILQ_INSERT_TAIL(&snl, &sudo_nss_file, entries);
+		got_match = saw_files = true;
+#ifdef HAVE_LDAP
+	    } else if (strcasecmp(cp, "ldap") == 0 && !saw_ldap) {
+		SUDO_NSS_CHECK_UNUSED(sudo_nss_ldap, "ldap");
+		TAILQ_INSERT_TAIL(&snl, &sudo_nss_ldap, entries);
+		got_match = saw_ldap = true;
+#endif
+#ifdef HAVE_SSSD
+	    } else if (strcasecmp(cp, "sss") == 0 && !saw_sss) {
+		SUDO_NSS_CHECK_UNUSED(sudo_nss_sss, "sss");
+		TAILQ_INSERT_TAIL(&snl, &sudo_nss_sss, entries);
+		got_match = saw_sss = true;
+#endif
+	    } else if (strcasecmp(cp, "[NOTFOUND=return]") == 0 && got_match) {
+		/* NOTFOUND affects the most recent entry */
+		TAILQ_LAST(&snl, sudo_nss_list)->ret_if_notfound = true;
+		got_match = false;
+	    } else if (strcasecmp(cp, "[SUCCESS=return]") == 0 && got_match) {
+		/* SUCCESS affects the most recent entry */
+		TAILQ_LAST(&snl, sudo_nss_list)->ret_if_found = true;
+		got_match = false;
+	    } else
+		got_match = false;
+	}
+	/* Only parse the first "sudoers:" line */
+	break;
+    }
+    free(line);
+    fclose(fp);
+
+nomatch:
+    /* Default to files only if no matches */
+    if (TAILQ_EMPTY(&snl))
+	TAILQ_INSERT_TAIL(&snl, &sudo_nss_file, entries);
+
+    debug_return_ptr(&snl);
+}
+
+#else /* (HAVE_LDAP || HAVE_SSSD) && _PATH_NSSWITCH_CONF */
+
+# if (defined(HAVE_LDAP) || defined(HAVE_SSSD)) && defined(_PATH_NETSVC_CONF)
+
+/*
+ * Read in /etc/netsvc.conf (like nsswitch.conf on AIX)
+ * Returns a tail queue of matches.
+ */
+struct sudo_nss_list *
+sudo_read_nss(void)
+{
+    FILE *fp;
+    char *cp, *ep, *last, *line = NULL;
+    size_t linesize = 0;
+#ifdef HAVE_SSSD
+    bool saw_sss = false;
+#endif
+    bool saw_files = false;
+    bool saw_ldap = false;
+    bool got_match = false;
+    static struct sudo_nss_list snl = TAILQ_HEAD_INITIALIZER(snl);
+    debug_decl(sudo_read_nss, SUDOERS_DEBUG_NSS);
+
+    if ((fp = fopen(_PATH_NETSVC_CONF, "r")) == NULL)
+	goto nomatch;
+
+    while (sudo_parseln(&line, &linesize, NULL, fp, 0) != -1) {
+	/* Skip blank or comment lines */
+	if (*(cp = line) == '\0')
+	    continue;
+
+	/* Look for a line starting with "sudoers = " */
+	if (strncasecmp(cp, "sudoers", 7) != 0)
+	    continue;
+	cp += 7;
+	while (isspace((unsigned char)*cp))
+	    cp++;
+	if (*cp++ != '=')
+	    continue;
+
+	/* Parse line */
+	for ((cp = strtok_r(cp, ",", &last)); cp != NULL; (cp = strtok_r(NULL, ",", &last))) {
+	    /* Trim leading whitespace. */
+	    while (isspace((unsigned char)*cp))
+		cp++;
+
+	    if (!saw_files && strncasecmp(cp, "files", 5) == 0 &&
+		(isspace((unsigned char)cp[5]) || cp[5] == '\0')) {
+		TAILQ_INSERT_TAIL(&snl, &sudo_nss_file, entries);
+		got_match = saw_files = true;
+		ep = &cp[5];
+#ifdef HAVE_LDAP
+	    } else if (!saw_ldap && strncasecmp(cp, "ldap", 4) == 0 &&
+		(isspace((unsigned char)cp[4]) || cp[4] == '\0')) {
+		TAILQ_INSERT_TAIL(&snl, &sudo_nss_ldap, entries);
+		got_match = saw_ldap = true;
+		ep = &cp[4];
+#endif
+#ifdef HAVE_SSSD
+	    } else if (!saw_sss && strncasecmp(cp, "sss", 3) == 0 &&
+		(isspace((unsigned char)cp[3]) || cp[3] == '\0')) {
+		TAILQ_INSERT_TAIL(&snl, &sudo_nss_sss, entries);
+		got_match = saw_sss = true;
+		ep = &cp[3];
+#endif
+	    } else {
+		got_match = false;
+	    }
+
+	    /* check for = auth qualifier */
+	    if (got_match && *ep) {
+		cp = ep;
+		while (isspace((unsigned char)*cp) || *cp == '=')
+		    cp++;
+		if (strncasecmp(cp, "auth", 4) == 0 &&
+		    (isspace((unsigned char)cp[4]) || cp[4] == '\0')) {
+		    TAILQ_LAST(&snl, sudo_nss_list)->ret_if_found = true;
+		}
+	    }
+	}
+	/* Only parse the first "sudoers" line */
+	break;
+    }
+    fclose(fp);
+
+nomatch:
+    /* Default to files only if no matches */
+    if (TAILQ_EMPTY(&snl))
+	TAILQ_INSERT_TAIL(&snl, &sudo_nss_file, entries);
+
+    debug_return_ptr(&snl);
+}
+
+# else /* !_PATH_NETSVC_CONF && !_PATH_NSSWITCH_CONF */
+
+/*
+ * Non-nsswitch.conf version with hard-coded order.
+ */
+struct sudo_nss_list *
+sudo_read_nss(void)
+{
+    static struct sudo_nss_list snl = TAILQ_HEAD_INITIALIZER(snl);
+    debug_decl(sudo_read_nss, SUDOERS_DEBUG_NSS);
+
+#  ifdef HAVE_SSSD
+    TAILQ_INSERT_TAIL(&snl, &sudo_nss_sss, entries);
+#  endif
+#  ifdef HAVE_LDAP
+    TAILQ_INSERT_TAIL(&snl, &sudo_nss_ldap, entries);
+#  endif
+    TAILQ_INSERT_TAIL(&snl, &sudo_nss_file, entries);
+
+    debug_return_ptr(&snl);
+}
+
+# endif /* !HAVE_LDAP || !_PATH_NETSVC_CONF */
+
+#endif /* HAVE_LDAP && _PATH_NSSWITCH_CONF */
+
+bool
+sudo_nss_can_continue(struct sudo_nss *nss, int match)
+{
+    debug_decl(sudo_nss_should_continue, SUDOERS_DEBUG_NSS);
+
+    /* Handle [NOTFOUND=return] */
+    if (nss->ret_if_notfound && match == UNSPEC)
+	debug_return_bool(false);
+
+    /* Handle [SUCCESS=return] */
+    if (nss->ret_if_found && match != UNSPEC)
+	debug_return_bool(false);
+
+    debug_return_bool(true);
+}