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blino |
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diff -up Linux-PAM-1.1.3/modules/pam_console/pam_console.c.abstract Linux-PAM-1.1.3/modules/pam_console/pam_console.c |
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--- Linux-PAM-1.1.3/modules/pam_console/pam_console.c.abstract 2008-12-16 13:37:52.000000000 +0100 |
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+++ Linux-PAM-1.1.3/modules/pam_console/pam_console.c 2010-11-01 17:01:55.000000000 +0100 |
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@@ -34,6 +34,8 @@ |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/param.h> |
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+#include <sys/socket.h> |
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+#include <sys/un.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <stdio.h> |
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@@ -136,6 +138,32 @@ check_one_console_name(const char *name, |
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} |
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static int |
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+try_xsocket(const char *path, size_t len) { |
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+ int fd; |
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+ union { |
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+ struct sockaddr sa; |
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+ struct sockaddr_un su; |
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+ } addr; |
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+ |
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+ fd = socket(AF_UNIX, SOCK_STREAM, 0); |
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+ if (fd < 0) |
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+ return 0; |
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+ |
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+ memset(&addr, 0, sizeof(addr)); |
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+ addr.su.sun_family = AF_UNIX; |
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+ |
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+ if (len > sizeof(addr.su.sun_path)) |
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+ return 0; |
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+ memcpy(addr.su.sun_path, path, len); |
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+ if (connect(fd, &addr.sa, sizeof(addr.su)) == 0) { |
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+ close(fd); |
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+ return 1; |
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+ } |
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+ close(fd); |
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+ return 0; |
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+} |
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+ |
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+static int |
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check_console_name(pam_handle_t *pamh, const char *consolename, int nonroot_ok, int on_set) { |
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int found = 0; |
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int statted = 0; |
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@@ -186,22 +214,29 @@ check_console_name(pam_handle_t *pamh, c |
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if (!statted && (consolename[0] == ':')) { |
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int l; |
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char *dot = NULL; |
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- strcpy(full_path, "/tmp/.X11-unix/X"); |
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- l = sizeof(full_path) - 1 - strlen(full_path); |
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+ char *path = full_path + 1; |
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+ |
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+ full_path[0] = '\0'; |
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+ strcpy(path, "/tmp/.X11-unix/X"); |
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+ l = sizeof(full_path) - 2 - strlen(path); |
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dot = strchr(consolename + 1, '.'); |
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if (dot != NULL) { |
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l = (l < dot - consolename - 1) ? l : dot - consolename - 1; |
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} |
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- strncat(full_path, consolename + 1, l); |
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+ strncat(path, consolename + 1, l); |
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full_path[sizeof(full_path) - 1] = '\0'; |
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- _pam_log(pamh, LOG_DEBUG, TRUE, "checking possible console \"%s\"", |
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- full_path); |
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- if (lstat(full_path, &st) != -1) { |
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+ _pam_log(pamh, LOG_DEBUG, TRUE, "checking possible X socket \"%s\"", |
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+ path); |
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+ |
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+ /* this will work because st.st_uid is 0 */ |
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+ if (try_xsocket(full_path, strlen(path)+1)) { |
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+ statted = 1; |
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+ } else if (try_xsocket(path, strlen(path))) { |
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statted = 1; |
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} |
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else if (!on_set) { /* there is no X11 socket in case of X11 crash */ |
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_pam_log(pamh, LOG_DEBUG, TRUE, "can't find X11 socket to examine for %s probably due to X crash", consolename); |
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- statted = 1; /* this will work because st.st_uid is 0 */ |
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+ statted = 1; |
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} |
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} |
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