rpm/rpm-4.16.1.3-add-fapolicyd-plugin.patch

commit 39595ccee321497dc3b08c7cab8a10304345429c
Author: Radovan Sroka <rsroka@redhat.com>
Date:   Tue Oct 27 16:18:04 2020 +0100

    Added fapolicyd rpm plugin
    
    Fapolicyd (File Access Policy Daemon) implements application whitelisting
    to decide file access rights. Applications that are known via a reputation
    source are allowed access while unknown applications are not.
    
    The rpm plugin allows us to use rpm database as a source of trust.
    We used dnf plugin since the beggining but it only provides notification
    when transaction ends. With "integrity checking" requirement we need
    a continual addition of files which are installed during the system
    update. With fapolicyd rpm plugin we can allow using of recently
    added/updated files in scriptlets during rpm transaction.
    
    The fapolicyd plugin gathers metadata of currently installed files.
    It sends the information about files and about ongoing rpm transaction
    to the fapolicyd daemon. The information is written to Linux pipe which
    is placed in /var/run/fapolicyd/fapolicyd.fifo.
    
    The data format is "%s %lu %64s\n". [path, size, sha256]
    
    The fapolicyd rpm plugin can be enabled with "--with-fapolicyd"
    configure option.
    
    Related PRs:
    https://github.com/linux-application-whitelisting/fapolicyd/pull/105
    https://github.com/linux-application-whitelisting/fapolicyd/pull/106
    
    Signed-off-by: Radovan Sroka <rsroka@redhat.com>

    Backported into 4.16.1.3, together with commit
    6d61b7118adcc14631b7ee5163a481472af940b8 (covscan fix)

diff -up rpm-4.16.1.3/configure.ac.orig rpm-4.16.1.3/configure.ac
--- rpm-4.16.1.3/configure.ac.orig	2021-03-22 11:05:07.311635968 +0100
+++ rpm-4.16.1.3/configure.ac	2021-07-22 16:18:29.352006782 +0200
@@ -891,6 +891,14 @@ AS_IF([test "$enable_plugins" != no],[
 AM_CONDITIONAL(IMA, [test "x$ac_cv_func_lsetxattr" = xyes])
 
 #=================
+# Check for fapolicyd support
+AC_ARG_WITH(fapolicyd,
+AS_HELP_STRING([--with-fapolicyd],[build with File Access Policy Daemon support]),
+with_fapolicyd=$withval,
+with_fapolicyd=auto)
+AM_CONDITIONAL(FAPOLICYD,[test "$with_fapolicyd" = yes])
+
+#=================
 # Check for audit library.
 AC_ARG_WITH(audit,
 AS_HELP_STRING([--with-audit],[Linux audit plugin]),
diff -up rpm-4.16.1.3/doc/Makefile.am.orig rpm-4.16.1.3/doc/Makefile.am
--- rpm-4.16.1.3/doc/Makefile.am.orig	2020-06-23 14:13:01.895628382 +0200
+++ rpm-4.16.1.3/doc/Makefile.am	2021-07-22 16:18:29.352006782 +0200
@@ -25,6 +25,9 @@ endif
 if IMA
 man_man8_DATA += rpm-plugin-ima.8
 endif
+if FAPOLICYD
+man_man8_DATA += rpm-plugin-fapolicyd.8
+endif
 if SELINUX
 man_man8_DATA += rpm-plugin-selinux.8
 endif
@@ -37,6 +40,8 @@ endif
 EXTRA_DIST += rpm-plugins.8 rpm-plugin-prioreset.8 rpm-plugin-syslog.8 
 EXTRA_DIST += rpm-plugin-audit.8 rpm-plugin-systemd-inhibit.8 
 EXTRA_DIST += rpm-plugin-ima.8 rpm-plugin-selinux.8 rpm2archive.8
+EXTRA_DIST += rpm-plugin-fapolicyd.8
+
 
 man_fr_man8dir = $(mandir)/fr/man8
 man_fr_man8_DATA = fr/rpm.8
diff -up rpm-4.16.1.3/doc/rpm-plugin-fapolicyd.8.orig rpm-4.16.1.3/doc/rpm-plugin-fapolicyd.8
--- rpm-4.16.1.3/doc/rpm-plugin-fapolicyd.8.orig	2021-07-22 16:18:29.353006800 +0200
+++ rpm-4.16.1.3/doc/rpm-plugin-fapolicyd.8	2021-07-22 16:18:29.353006800 +0200
@@ -0,0 +1,21 @@
+'\" t
+.TH "RPM-FAPOLICYD" "8" "28 Jan 2021" "Red Hat, Inc."
+.SH NAME
+rpm-plugin-fapolicyd \- Fapolicyd plugin for the RPM Package Manager
+
+.SH Description
+
+The plugin gathers metadata of currently installed files. It sends the
+information about files and about ongoing rpm transaction to the fapolicyd daemon.
+The information is written to Linux pipe which is placed in
+/var/run/fapolicyd/fapolicyd.fifo.
+
+.SH Configuration
+
+There are currently no options for this plugin in particular. See
+.BR rpm-plugins (8)
+on how to control plugins in general.
+
+.SH SEE ALSO
+.IR fapolicyd (8)
+.IR rpm-plugins (8)
diff -up rpm-4.16.1.3/macros.in.orig rpm-4.16.1.3/macros.in
--- rpm-4.16.1.3/macros.in.orig	2021-07-22 16:18:20.525844141 +0200
+++ rpm-4.16.1.3/macros.in	2021-07-22 16:19:36.196238525 +0200
@@ -1208,6 +1208,7 @@ package or when debugging this package.\
 %__transaction_selinux		%{__plugindir}/selinux.so
 %__transaction_syslog		%{__plugindir}/syslog.so
 %__transaction_ima		%{__plugindir}/ima.so
+%__transaction_fapolicyd	%{__plugindir}/fapolicyd.so
 %__transaction_prioreset	%{__plugindir}/prioreset.so
 %__transaction_audit		%{__plugindir}/audit.so
 
diff -up rpm-4.16.1.3/Makefile.am.orig rpm-4.16.1.3/Makefile.am
--- rpm-4.16.1.3/Makefile.am.orig	2021-07-22 16:18:29.350006745 +0200
+++ rpm-4.16.1.3/Makefile.am	2021-07-22 16:19:18.223907346 +0200
@@ -14,6 +14,7 @@ DISTCHECK_CONFIGURE_FLAGS = \
 	--with-audit \
 	--with-selinux \
 	--with-imaevm \
+	--with-fapolicyd \
 	--disable-dependency-tracking
 
 include $(top_srcdir)/rpm.am
diff -up rpm-4.16.1.3/plugins/fapolicyd.c.orig rpm-4.16.1.3/plugins/fapolicyd.c
--- rpm-4.16.1.3/plugins/fapolicyd.c.orig	2021-07-22 16:18:29.356006855 +0200
+++ rpm-4.16.1.3/plugins/fapolicyd.c	2021-07-22 16:18:35.380117862 +0200
@@ -0,0 +1,191 @@
+#include "system.h"
+
+#include <rpm/rpmts.h>
+#include <rpm/rpmlog.h>
+#include "lib/rpmplugin.h"
+
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+struct fapolicyd_data {
+    int fd;
+    long changed_files;
+    const char * fifo_path;
+};
+
+static struct fapolicyd_data fapolicyd_state = {
+    .fd = -1,
+    .changed_files = 0,
+    .fifo_path = "/run/fapolicyd/fapolicyd.fifo",
+};
+
+static rpmRC open_fifo(struct fapolicyd_data* state)
+{
+    int fd = -1;
+    struct stat s;
+
+    fd = open(state->fifo_path, O_RDWR);
+    if (fd == -1) {
+        rpmlog(RPMLOG_DEBUG, "Open: %s -> %s\n", state->fifo_path, strerror(errno));
+        goto bad;
+    }
+
+    if (stat(state->fifo_path, &s) == -1) {
+        rpmlog(RPMLOG_DEBUG, "Stat: %s -> %s\n", state->fifo_path, strerror(errno));
+        goto bad;
+    }
+
+    if (!S_ISFIFO(s.st_mode)) {
+        rpmlog(RPMLOG_DEBUG, "File: %s exists but it is not a pipe!\n", state->fifo_path);
+        goto bad;
+    }
+
+    /* keep only file's permition bits */
+    mode_t mode = s.st_mode & ~S_IFMT;
+
+    /* we require pipe to have 0660 permission */
+    if (mode != 0660) {
+        rpmlog(RPMLOG_ERR, "File: %s has %o instead of 0660 \n",
+               state->fifo_path,
+               mode );
+        goto bad;
+    }
+
+    state->fd = fd;
+    /* considering success */
+    return RPMRC_OK;
+
+ bad:
+    if (fd >= 0)
+        close(fd);
+    return RPMRC_FAIL;
+}
+
+static rpmRC write_fifo(struct fapolicyd_data* state, const char * str)
+{
+    ssize_t len = strlen(str);
+    ssize_t written = 0;
+    ssize_t n = 0;
+
+    while (written < len) {
+        if ((n = write(state->fd, str + written, len - written)) < 0) {
+            if (errno == EINTR || errno == EAGAIN)
+                continue;
+            rpmlog(RPMLOG_DEBUG, "Write: %s -> %s\n", state->fifo_path, strerror(errno));
+            goto bad;
+        }
+        written += n;
+    }
+
+    return RPMRC_OK;
+
+ bad:
+    return RPMRC_FAIL;
+}
+
+static rpmRC fapolicyd_init(rpmPlugin plugin, rpmts ts)
+{
+    if (rpmtsFlags(ts) & (RPMTRANS_FLAG_TEST|RPMTRANS_FLAG_BUILD_PROBS))
+        goto end;
+
+    if (!rstreq(rpmtsRootDir(ts), "/"))
+        goto end;
+
+    (void) open_fifo(&fapolicyd_state);
+
+ end:
+    return RPMRC_OK;
+}
+
+static void fapolicyd_cleanup(rpmPlugin plugin)
+{
+    if (fapolicyd_state.fd > 0)
+        (void) close(fapolicyd_state.fd);
+
+    fapolicyd_state.fd = -1;
+}
+
+static rpmRC fapolicyd_tsm_post(rpmPlugin plugin, rpmts ts, int res)
+{
+    if (rpmtsFlags(ts) & (RPMTRANS_FLAG_TEST|RPMTRANS_FLAG_BUILD_PROBS))
+        goto end;
+
+    /* we are ready */
+    if (fapolicyd_state.fd > 0) {
+        /* send a signal that transaction is over */
+        (void) write_fifo(&fapolicyd_state, "1\n");
+        /* flush cache */
+        (void) write_fifo(&fapolicyd_state, "2\n");
+    }
+
+ end:
+    return RPMRC_OK;
+}
+
+static rpmRC fapolicyd_scriptlet_pre(rpmPlugin plugin, const char *s_name,
+                                     int type)
+{
+    if (fapolicyd_state.fd == -1)
+        goto end;
+
+    if (fapolicyd_state.changed_files > 0) {
+        /* send signal to flush cache */
+        (void) write_fifo(&fapolicyd_state, "2\n");
+
+        /* optimize flushing */
+        /* flush only when there was an actual change */
+        fapolicyd_state.changed_files = 0;
+    }
+
+ end:
+    return RPMRC_OK;
+}
+
+static rpmRC fapolicyd_fsm_file_prepare(rpmPlugin plugin, rpmfi fi,
+                                        const char *path, const char *dest,
+                                        mode_t file_mode, rpmFsmOp op)
+{
+    /* not ready  */
+    if (fapolicyd_state.fd == -1)
+        goto end;
+
+    rpmFileAction action = XFO_ACTION(op);
+
+    /* Ignore skipped files and unowned directories */
+    if (XFA_SKIPPING(action) || (op & FAF_UNOWNED)) {
+        rpmlog(RPMLOG_DEBUG, "fapolicyd skipping early: path %s dest %s\n",
+               path, dest);
+        goto end;
+    }
+
+    if (!S_ISREG(rpmfiFMode(fi))) {
+        rpmlog(RPMLOG_DEBUG, "fapolicyd skipping non regular: path %s dest %s\n",
+               path, dest);
+        goto end;
+    }
+
+    fapolicyd_state.changed_files++;
+
+    char buffer[4096];
+
+    rpm_loff_t size = rpmfiFSize(fi);
+    char * sha = rpmfiFDigestHex(fi, NULL);
+
+    snprintf(buffer, 4096, "%s %lu %64s\n", dest, size, sha);
+    (void) write_fifo(&fapolicyd_state, buffer);
+
+    free(sha);
+
+ end:
+    return RPMRC_OK;
+}
+
+struct rpmPluginHooks_s fapolicyd_hooks = {
+    .init = fapolicyd_init,
+    .cleanup = fapolicyd_cleanup,
+    .scriptlet_pre = fapolicyd_scriptlet_pre,
+    .tsm_post = fapolicyd_tsm_post,
+    .fsm_file_prepare = fapolicyd_fsm_file_prepare,
+};
diff -up rpm-4.16.1.3/plugins/Makefile.am.orig rpm-4.16.1.3/plugins/Makefile.am
--- rpm-4.16.1.3/plugins/Makefile.am.orig	2021-07-22 16:18:23.022890155 +0200
+++ rpm-4.16.1.3/plugins/Makefile.am	2021-07-22 16:18:55.797494098 +0200
@@ -43,6 +43,12 @@ ima_la_LIBADD = $(top_builddir)/lib/libr
 plugins_LTLIBRARIES += ima.la
 endif
 
+if FAPOLICYD
+fapolicyd_la_sources = fapolicyd.c
+fapolicyd_la_LIBADD = $(top_builddir)/lib/librpm.la $(top_builddir)/rpmio/librpmio.la
+plugins_LTLIBRARIES += fapolicyd.la
+endif
+
 if AUDIT
 audit_la_sources = audit.c
 audit_la_LIBADD = $(top_builddir)/lib/librpm.la $(top_builddir)/rpmio/librpmio.la @WITH_AUDIT_LIB@