pam_loginuid: make it return PAM_IGNORE in containers
This commit is contained in:
Tomas Mraz
parent
9b30e30268
commit
1368ecb1ca
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@ -0,0 +1,151 @@
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diff -up Linux-PAM-1.1.8/modules/pam_loginuid/pam_loginuid.c.container Linux-PAM-1.1.8/modules/pam_loginuid/pam_loginuid.c
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--- Linux-PAM-1.1.8/modules/pam_loginuid/pam_loginuid.c.container 2013-06-18 16:11:21.000000000 +0200
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+++ Linux-PAM-1.1.8/modules/pam_loginuid/pam_loginuid.c 2014-01-27 17:24:53.000000000 +0100
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@@ -47,25 +47,56 @@
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/*
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* This function writes the loginuid to the /proc system. It returns
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- * 0 on success and 1 on failure.
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+ * PAM_SUCCESS on success,
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+ * PAM_IGNORE when /proc/self/loginuid does not exist,
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+ * PAM_SESSION_ERR in case of any other error.
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*/
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static int set_loginuid(pam_handle_t *pamh, uid_t uid)
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{
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- int fd, count, rc = 0;
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- char loginuid[24];
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+ int fd, count, rc = PAM_SESSION_ERR;
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+ char loginuid[24], buf[24];
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+ static const char host_uid_map[] = " 0 0 4294967295\n";
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+ char uid_map[sizeof(host_uid_map)];
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+
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+ /* loginuid in user namespaces currently isn't writable and in some
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+ case, not even readable, so consider any failure as ignorable (but try
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+ anyway, in case we hit a kernel which supports it). */
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+ fd = open("/proc/self/uid_map", O_RDONLY);
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+ if (fd >= 0) {
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+ count = pam_modutil_read(fd, uid_map, sizeof(uid_map));
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+ if (strncmp(uid_map, host_uid_map, count) != 0)
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+ rc = PAM_IGNORE;
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+ close(fd);
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+ }
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- count = snprintf(loginuid, sizeof(loginuid), "%lu", (unsigned long)uid);
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- fd = open("/proc/self/loginuid", O_NOFOLLOW|O_WRONLY|O_TRUNC);
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+ fd = open("/proc/self/loginuid", O_NOFOLLOW|O_RDWR);
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if (fd < 0) {
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- if (errno != ENOENT) {
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- rc = 1;
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- pam_syslog(pamh, LOG_ERR,
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- "Cannot open /proc/self/loginuid: %m");
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+ if (errno == ENOENT) {
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+ rc = PAM_IGNORE;
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+ }
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+ if (rc != PAM_IGNORE) {
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+ pam_syslog(pamh, LOG_ERR, "Cannot open %s: %m",
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+ "/proc/self/loginuid");
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}
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return rc;
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}
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- if (pam_modutil_write(fd, loginuid, count) != count)
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- rc = 1;
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+
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+ count = snprintf(loginuid, sizeof(loginuid), "%lu", (unsigned long)uid);
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+ if (pam_modutil_read(fd, buf, sizeof(buf)) == count &&
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+ memcmp(buf, loginuid, count) == 0) {
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+ rc = PAM_SUCCESS;
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+ goto done; /* already correct */
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+ }
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+ if (lseek(fd, 0, SEEK_SET) == 0 && ftruncate(fd, 0) == 0 &&
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+ pam_modutil_write(fd, loginuid, count) == count) {
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+ rc = PAM_SUCCESS;
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+ } else {
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+ if (rc != PAM_IGNORE) {
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+ pam_syslog(pamh, LOG_ERR, "Error writing %s: %m",
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+ "/proc/self/loginuid");
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+ }
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+ }
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+ done:
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close(fd);
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return rc;
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}
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@@ -165,6 +196,7 @@ _pam_loginuid(pam_handle_t *pamh, int fl
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{
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const char *user = NULL;
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struct passwd *pwd;
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+ int ret;
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#ifdef HAVE_LIBAUDIT
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int require_auditd = 0;
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#endif
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@@ -183,9 +215,14 @@ _pam_loginuid(pam_handle_t *pamh, int fl
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return PAM_SESSION_ERR;
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}
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- if (set_loginuid(pamh, pwd->pw_uid)) {
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- pam_syslog(pamh, LOG_ERR, "set_loginuid failed\n");
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- return PAM_SESSION_ERR;
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+ ret = set_loginuid(pamh, pwd->pw_uid);
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+ switch (ret) {
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+ case PAM_SUCCESS:
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+ case PAM_IGNORE:
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+ break;
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+ default:
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+ pam_syslog(pamh, LOG_ERR, "set_loginuid failed");
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+ return ret;
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}
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#ifdef HAVE_LIBAUDIT
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@@ -195,11 +232,12 @@ _pam_loginuid(pam_handle_t *pamh, int fl
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argv++;
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}
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- if (require_auditd)
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- return check_auditd();
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- else
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+ if (require_auditd) {
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+ int rc = check_auditd();
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+ return rc != PAM_SUCCESS ? rc : ret;
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+ } else
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#endif
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- return PAM_SUCCESS;
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+ return ret;
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}
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/*
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diff -up Linux-PAM-1.1.8/modules/pam_loginuid/pam_loginuid.8.xml.container Linux-PAM-1.1.8/modules/pam_loginuid/pam_loginuid.8.xml
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--- Linux-PAM-1.1.8/modules/pam_loginuid/pam_loginuid.8.xml.container 2013-06-18 16:11:21.000000000 +0200
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+++ Linux-PAM-1.1.8/modules/pam_loginuid/pam_loginuid.8.xml 2014-05-22 11:33:14.000000000 +0200
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@@ -69,14 +69,31 @@
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<para>
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<variablelist>
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<varlistentry>
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+ <term>PAM_SUCCESS</term>
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+ <listitem>
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+ <para>
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+ The loginuid value is set and auditd is running if check requested.
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+ </para>
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+ </listitem>
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+ </varlistentry>
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+ <varlistentry>
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+ <term>PAM_IGNORE</term>
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+ <listitem>
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+ <para>
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+ The /proc/self/loginuid file is not present on the system or the
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+ login process runs inside uid namespace and kernel does not support
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+ overwriting loginuid.
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+ </para>
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+ </listitem>
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+ </varlistentry>
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+ <varlistentry>
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<term>PAM_SESSION_ERR</term>
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<listitem>
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<para>
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- An error occurred during session management.
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+ Any other error prevented setting loginuid or auditd is not running.
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</para>
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</listitem>
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</varlistentry>
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-
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</variablelist>
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</para>
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</refsect1>
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7
pam.spec
7
pam.spec
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@ -3,7 +3,7 @@
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Summary: An extensible library which provides authentication for applications
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Name: pam
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Version: 1.1.8
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Release: 10%{?dist}
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Release: 11%{?dist}
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# The library is BSD licensed with option to relicense as GPLv2+
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# - this option is redundant as the BSD license allows that anyway.
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# pam_timestamp, pam_loginuid, and pam_console modules are GPLv2+.
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@ -47,6 +47,7 @@ Patch33: pam-1.1.8-translation-updates.patch
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Patch34: pam-1.1.8-canonicalize-username.patch
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Patch35: pam-1.1.8-cve-2013-7041.patch
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Patch36: pam-1.1.8-cve-2014-2583.patch
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Patch37: pam-1.1.8-loginuid-container.patch
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%define _pamlibdir %{_libdir}
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%define _moduledir %{_libdir}/security
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@ -127,6 +128,7 @@ mv pam-redhat-%{pam_redhat_version}/* modules
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%patch34 -p1 -b .canonicalize
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%patch35 -p1 -b .case
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%patch36 -p1 -b .timestamp-ruser
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%patch37 -p1 -b .container
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%build
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autoreconf -i
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@ -375,6 +377,9 @@ fi
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%doc doc/adg/*.txt doc/adg/html
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%changelog
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* Thu May 22 2014 Tomáš Mráz <tmraz@redhat.com> 1.1.8-11
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- pam_loginuid: make it return PAM_IGNORE in containers
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* Mon Mar 31 2014 Tomáš Mráz <tmraz@redhat.com> 1.1.8-10
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- fix CVE-2014-2583: potential path traversal issue in pam_timestamp
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