Imported Upstream version 1.8.3

[debian/sudo] / plugins / sudoers / match_addr.c

diff --git a/plugins/sudoers/match_addr.c b/plugins/sudoers/match_addr.c
new file mode 100644 (file)
index 0000000..f4bc731
--- /dev/null
+++ b/plugins/sudoers/match_addr.c
@@ -0,0 +1,195 @@
+/*
+ * Copyright (c) 1996, 1998-2005, 2007-2011
+ *     Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * 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.
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif /* STDC_HEADERS */
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include "sudoers.h"
+#include "interfaces.h"
+
+static int
+addr_matches_if(char *n)
+{
+    union sudo_in_addr_un addr;
+    struct interface *ifp;
+#ifdef HAVE_IN6_ADDR
+    int j;
+#endif
+    int family;
+
+#ifdef HAVE_IN6_ADDR
+    if (inet_pton(AF_INET6, n, &addr.ip6) > 0) {
+       family = AF_INET6;
+    } else
+#endif
+    {
+       family = AF_INET;
+       addr.ip4.s_addr = inet_addr(n);
+    }
+
+    for (ifp = interfaces; ifp != NULL; ifp = ifp->next) {
+       if (ifp->family != family)
+           continue;
+       switch(family) {
+           case AF_INET:
+               if (ifp->addr.ip4.s_addr == addr.ip4.s_addr ||
+                   (ifp->addr.ip4.s_addr & ifp->netmask.ip4.s_addr)
+                   == addr.ip4.s_addr)
+                   return TRUE;
+               break;
+#ifdef HAVE_IN6_ADDR
+           case AF_INET6:
+               if (memcmp(ifp->addr.ip6.s6_addr, addr.ip6.s6_addr,
+                   sizeof(addr.ip6.s6_addr)) == 0)
+                   return TRUE;
+               for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
+                   if ((ifp->addr.ip6.s6_addr[j] & ifp->netmask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
+                       break;
+               }
+               if (j == sizeof(addr.ip6.s6_addr))
+                   return TRUE;
+#endif
+       }
+    }
+
+    return FALSE;
+}
+
+static int
+addr_matches_if_netmask(char *n, char *m)
+{
+    int i;
+    union sudo_in_addr_un addr, mask;
+    struct interface *ifp;
+#ifdef HAVE_IN6_ADDR
+    int j;
+#endif
+    int family;
+
+#ifdef HAVE_IN6_ADDR
+    if (inet_pton(AF_INET6, n, &addr.ip6) > 0)
+       family = AF_INET6;
+    else
+#endif
+    {
+       family = AF_INET;
+       addr.ip4.s_addr = inet_addr(n);
+    }
+
+    if (family == AF_INET) {
+       if (strchr(m, '.')) {
+           mask.ip4.s_addr = inet_addr(m);
+       } else {
+           i = atoi(m);
+           if (i == 0)
+               mask.ip4.s_addr = 0;
+           else if (i == 32)
+               mask.ip4.s_addr = 0xffffffff;
+           else
+               mask.ip4.s_addr = 0xffffffff - (1 << (32 - i)) + 1;
+           mask.ip4.s_addr = htonl(mask.ip4.s_addr);
+       }
+       addr.ip4.s_addr &= mask.ip4.s_addr;
+    }
+#ifdef HAVE_IN6_ADDR
+    else {
+       if (inet_pton(AF_INET6, m, &mask.ip6) <= 0) {
+           j = atoi(m);
+           for (i = 0; i < sizeof(addr.ip6.s6_addr); i++) {
+               if (j < i * 8)
+                   mask.ip6.s6_addr[i] = 0;
+               else if (i * 8 + 8 <= j)
+                   mask.ip6.s6_addr[i] = 0xff;
+               else
+                   mask.ip6.s6_addr[i] = 0xff00 >> (j - i * 8);
+               addr.ip6.s6_addr[i] &= mask.ip6.s6_addr[i];
+           }
+       }
+    }
+#endif /* HAVE_IN6_ADDR */
+
+    for (ifp = interfaces; ifp != NULL; ifp = ifp->next) {
+       if (ifp->family != family)
+           continue;
+       switch(family) {
+           case AF_INET:
+               if ((ifp->addr.ip4.s_addr & mask.ip4.s_addr) == addr.ip4.s_addr)
+                   return TRUE;
+#ifdef HAVE_IN6_ADDR
+           case AF_INET6:
+               for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
+                   if ((ifp->addr.ip6.s6_addr[j] & mask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
+                       break;
+               }
+               if (j == sizeof(addr.ip6.s6_addr))
+                   return TRUE;
+#endif /* HAVE_IN6_ADDR */
+       }
+    }
+
+    return FALSE;
+}
+
+/*
+ * Returns TRUE if "n" is one of our ip addresses or if
+ * "n" is a network that we are on, else returns FALSE.
+ */
+int
+addr_matches(char *n)
+{
+    char *m;
+    int retval;
+
+    /* If there's an explicit netmask, use it. */
+    if ((m = strchr(n, '/'))) {
+       *m++ = '\0';
+       retval = addr_matches_if_netmask(n, m);
+       *(m - 1) = '/';
+    } else
+       retval = addr_matches_if(n);
+
+    return retval;
+}