Rewrite dpkginfo probe without using APT

.github/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
     - name: Install Deps
       run: |
         sudo apt-get update
-        sudo apt-get -y install lcov swig xsltproc rpm-common lua5.3 libpcre2-dev libyaml-dev libapt-pkg-dev libdbus-1-dev libdbus-glib-1-dev libcurl4-openssl-dev libgcrypt-dev libselinux1-dev libgconf2-dev libacl1-dev libblkid-dev libcap-dev libxml2-dev libxslt1-dev libxml-parser-perl libxml-xpath-perl libperl-dev librpm-dev librtmp-dev libxmlsec1-dev libxmlsec1-openssl python3-dbusmock python3-pytest
+        sudo apt-get -y install lcov swig xsltproc rpm-common lua5.3 libpcre2-dev libyaml-dev libdbus-1-dev libdbus-glib-1-dev libcurl4-openssl-dev libgcrypt-dev libselinux1-dev libgconf2-dev libacl1-dev libblkid-dev libcap-dev libxml2-dev libxslt1-dev libxml-parser-perl libxml-xpath-perl libperl-dev librpm-dev librtmp-dev libxmlsec1-dev libxmlsec1-openssl python3-dbusmock python3-pytest
         sudo apt-get -y remove rpm
 
     # Runs a set of commands using the runners shell
@@ -57,7 +57,7 @@ jobs:
       image: fedora:latest
     steps:
     - name: Install Deps
-      run: dnf install -y cmake git dbus-devel GConf2-devel libacl-devel libblkid-devel libcap-devel libcurl-devel libgcrypt-devel libselinux-devel libxml2-devel libxslt-devel libattr-devel make openldap-devel pcre2-devel perl-XML-Parser perl-XML-XPath perl-devel python3-devel python3-dbusmock rpm-devel swig bzip2-devel gcc-c++ libyaml-devel xmlsec1-devel xmlsec1-openssl-devel hostname bzip2 lua rpm-build which strace apt-devel python3-pytest
+      run: dnf install -y cmake git dbus-devel GConf2-devel libacl-devel libblkid-devel libcap-devel libcurl-devel libgcrypt-devel libselinux-devel libxml2-devel libxslt-devel libattr-devel make openldap-devel pcre2-devel perl-XML-Parser perl-XML-XPath perl-devel python3-devel python3-dbusmock rpm-devel swig bzip2-devel gcc-c++ libyaml-devel xmlsec1-devel xmlsec1-openssl-devel hostname bzip2 lua rpm-build which strace python3-pytest
     - name: Checkout
       uses: actions/checkout@v3
       with:

.github/workflows/codeql.yml

@@ -32,7 +32,7 @@ jobs:
     - name: Install Deps
       run: |
         sudo apt-get update
-        sudo apt-get -y install lcov swig xsltproc rpm-common lua5.3 libyaml-dev libapt-pkg-dev libdbus-1-dev libdbus-glib-1-dev libcurl4-openssl-dev libgcrypt-dev libselinux1-dev libgconf2-dev libacl1-dev libblkid-dev libcap-dev libxml2-dev libxslt1-dev libxml-parser-perl libxml-xpath-perl libperl-dev librpm-dev librtmp-dev libxmlsec1-dev libxmlsec1-openssl python3-dbusmock
+        sudo apt-get -y install lcov swig xsltproc rpm-common lua5.3 libyaml-dev libdbus-1-dev libdbus-glib-1-dev libcurl4-openssl-dev libgcrypt-dev libselinux1-dev libgconf2-dev libacl1-dev libblkid-dev libcap-dev libxml2-dev libxslt1-dev libxml-parser-perl libxml-xpath-perl libperl-dev librpm-dev librtmp-dev libxmlsec1-dev libxmlsec1-openssl python3-dbusmock
         sudo apt-get -y remove rpm
 
     # Initializes the CodeQL tools for scanning.

CMakeLists.txt

@@ -299,7 +299,7 @@ cmake_dependent_option(OPENSCAP_PROBE_UNIX_UNAME "Unix uname probe" ON "ENABLE_P
 cmake_dependent_option(OPENSCAP_PROBE_UNIX_XINETD "Unix xinetd probe" ON "ENABLE_PROBES_UNIX" OFF)
 
 # LINUX PROBES
-cmake_dependent_option(OPENSCAP_PROBE_LINUX_DPKGINFO "Linux dpkginfo probe" ON "ENABLE_PROBES_LINUX; APTPKG_FOUND" OFF)
+cmake_dependent_option(OPENSCAP_PROBE_LINUX_DPKGINFO "Linux dpkginfo probe" ON "ENABLE_PROBES_LINUX" OFF)
 cmake_dependent_option(OPENSCAP_PROBE_LINUX_IFLISTENERS "Linux iflisteners probe" ON "ENABLE_PROBES_LINUX" OFF)
 cmake_dependent_option(OPENSCAP_PROBE_LINUX_INETLISTENINGSERVERS "Linux inetlisteningservers probe" ON "ENABLE_PROBES_LINUX" OFF)
 cmake_dependent_option(OPENSCAP_PROBE_LINUX_PARTITION "Linux partition probe" ON "ENABLE_PROBES_LINUX; BLKID_FOUND" OFF)
@@ -433,7 +433,7 @@ message(STATUS "  Unix xinetd probe: ${OPENSCAP_PROBE_UNIX_XINETD}")
 message(STATUS " ")
 
 message(STATUS "Linux probes: ${ENABLE_PROBES_LINUX}")
-message(STATUS "  Linux dpkginfo probe (depends on aptpkg): ${OPENSCAP_PROBE_LINUX_DPKGINFO}")
+message(STATUS "  Linux dpkginfo probe: ${OPENSCAP_PROBE_LINUX_DPKGINFO}")
 message(STATUS "  Linux iflisteners probe: ${OPENSCAP_PROBE_LINUX_IFLISTENERS}")
 message(STATUS "  Linux inetlisteningservers probe: ${OPENSCAP_PROBE_LINUX_INETLISTENINGSERVERS}")
 message(STATUS "  Linux partition probe (depends on blkid): ${OPENSCAP_PROBE_LINUX_PARTITION}")

docs/developer/developer.adoc

@@ -66,7 +66,7 @@ sudo dnf install \
 cmake dbus-devel GConf2-devel libacl-devel libblkid-devel libcap-devel libcurl-devel \
 libgcrypt-devel libselinux-devel libxml2-devel libxslt-devel libattr-devel make openldap-devel \
 pcre-devel perl-XML-Parser perl-XML-XPath perl-devel python3-devel python3-dbusmock rpm-devel swig \
-bzip2-devel gcc-c++ libyaml-devel xmlsec1-devel xmlsec1-openssl-devel apt-devel
+bzip2-devel gcc-c++ libyaml-devel xmlsec1-devel xmlsec1-openssl-devel
 ----
 
 On RHEL 8+ / CentOS 8+, the command to install the build dependencies is:
@@ -85,7 +85,7 @@ On Ubuntu 16.04, Debian 8 or Debian 9, the command to install the build dependen
 sudo apt-get install -y cmake libdbus-1-dev libdbus-glib-1-dev libcurl4-openssl-dev \
 libgcrypt20-dev libselinux1-dev libxslt1-dev libgconf2-dev libacl1-dev libblkid-dev \
 libcap-dev libxml2-dev libldap2-dev libpcre3-dev python-dev swig libxml-parser-perl \
-libxml-xpath-perl libperl-dev libbz2-dev librpm-dev g++ libapt-pkg-dev libyaml-dev \
+libxml-xpath-perl libperl-dev libbz2-dev librpm-dev g++ libyaml-dev \
 libxmlsec1-dev libxmlsec1-openssl
 ----
 

openscap.spec

@@ -13,9 +13,6 @@ BuildRequires:  cmake >= 2.6
 BuildRequires:  gcc
 BuildRequires:  gcc-c++
 BuildRequires:  swig libxml2-devel libxslt-devel perl-generators perl-XML-Parser
-%if 0%{?fedora}
-BuildRequires:  apt-devel
-%endif
 BuildRequires:  rpm-devel
 BuildRequires:  libgcrypt-devel
 %if 0%{?fedora}
@@ -47,9 +44,6 @@ Requires:       libacl
 Requires:       libblkid
 Requires:       libcap
 Requires:       libselinux
-%if 0%{?fedora}
-Requires:       apt-libs
-%endif
 Requires:       openldap
 Requires:       popt
 # Fedora has procps-ng, which provides procps

src/CMakeLists.txt

@@ -115,9 +115,6 @@ endif()
 if(DBUS_FOUND)
 	target_link_libraries(openscap ${DBUS_LIBRARIES})
 endif()
-if(APTPKG_FOUND)
-	target_link_libraries(openscap ${APTPKG_LIBRARIES})
-endif()
 if(ACL_FOUND)
 	target_link_libraries(openscap ${ACL_LIBRARY})
 endif()

src/OVAL/probes/probe-table.c

@@ -257,7 +257,7 @@ static const probe_table_entry_t probe_table[] = {
 	{OVAL_INDEPENDENT_YAML_FILE_CONTENT, NULL, yamlfilecontent_probe_main, NULL, yamlfilecontent_probe_offline_mode_supported},
 #endif
 #ifdef OPENSCAP_PROBE_LINUX_DPKGINFO
-	{OVAL_LINUX_DPKG_INFO, dpkginfo_probe_init, dpkginfo_probe_main, dpkginfo_probe_fini, dpkginfo_probe_offline_mode_supported},
+	{OVAL_LINUX_DPKG_INFO, NULL, dpkginfo_probe_main, NULL, dpkginfo_probe_offline_mode_supported},
 #endif
 #ifdef OPENSCAP_PROBE_LINUX_IFLISTENERS
 	{OVAL_LINUX_IFLISTENERS, NULL, iflisteners_probe_main, NULL, NULL},

src/OVAL/probes/unix/linux/CMakeLists.txt

@@ -1,13 +1,10 @@
 if(OPENSCAP_PROBE_LINUX_DPKGINFO)
 	list(APPEND LINUX_PROBES_SOURCES
-		"dpkginfo-helper.cxx"
+		"dpkginfo-helper.c"
 		"dpkginfo-helper.h"
 		"dpkginfo_probe.c"
 		"dpkginfo_probe.h"
 	)
-	list(APPEND LINUX_PROBES_INCLUDE_DIRECTORIES
-		${APTPKG_INCLUDE_DIR}
-	)
 endif()
 
 if(OPENSCAP_PROBE_LINUX_IFLISTENERS)

src/OVAL/probes/unix/linux/dpkginfo-helper.c

@@ -0,0 +1,179 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+
+#include "debug_priv.h"
+#include "dpkginfo-helper.h"
+
+#define DPKG_STATUS_BUFFER_SIZE 4096
+
+static char* trimleft(char *str)
+{
+	while (isspace((unsigned char)*str))
+		str++;
+
+	if (*str == 0)
+		return str;
+
+	return str;
+}
+
+static int version(struct dpkginfo_reply_t *reply)
+{
+	char *evr, *epoch, *version, *release;
+
+	if (reply->evr == NULL)
+		return -1;
+
+	evr = strdup(reply->evr);
+	if (evr == NULL)
+		return -1;
+
+	if ((epoch = strchr(evr, ':')) != NULL) {
+		*epoch++ = '\0';
+		reply->epoch = strdup(evr);
+		if (reply->epoch == NULL)
+			goto err;
+	} else {
+		reply->epoch = strdup("0");
+		if (reply->epoch == NULL)
+			goto err;
+		epoch = evr;
+	}
+
+	version = epoch;
+	if ((release = strchr(version, '-')) != NULL) {
+		*release++ = '\0';
+		reply->release = strdup(release);
+		if (reply->release == NULL)
+			goto err;
+	}
+	reply->version = strdup(version);
+	if (reply->version == NULL)
+		goto err;
+
+	free(evr);
+	return 0;
+err:
+	free(evr);
+	return -1;
+}
+
+struct dpkginfo_reply_t* dpkginfo_get_by_name(const char *name, int *err)
+{
+	FILE *f;
+	char buf[DPKG_STATUS_BUFFER_SIZE], path[PATH_MAX], *root, *key, *value;
+	struct dpkginfo_reply_t *reply;
+
+	*err = 0;
+	reply = NULL;
+
+	root = getenv("OSCAP_PROBE_ROOT");
+	if (root != NULL)
+		snprintf(path, PATH_MAX, "%s/var/lib/dpkg/status", root);
+	else
+		snprintf(path, PATH_MAX, "/var/lib/dpkg/status");
+
+	f = fopen(path, "r");
+	if (f == NULL) {
+		dW("%s not found.", path);
+		*err = -1;
+		return NULL;
+	}
+
+	dD("Searching package \"%s\".", name);
+
+	while (fgets(buf, DPKG_STATUS_BUFFER_SIZE, f)) {
+		if (buf[0] == '\n') {
+			// New package entry.
+			if (reply != NULL) {
+				// Package found.
+				goto out;
+			}
+			continue;
+		}
+		if (isspace(buf[0])) {
+			// Ignore line beginning by a space.
+			continue;
+		}
+		buf[strcspn(buf, "\n")] = 0;
+		key = buf;
+		value = strchr(buf, ':');
+		if (value == NULL) {
+			// Ignore truncated line.
+			continue;
+		}
+		*value++ = '\0';
+		value = trimleft(value);
+		// Package should be the first line.
+		if (strcmp(key, "Package") == 0) {
+			if (strcmp(value, name) == 0) {
+				if (reply != NULL)
+					continue;
+				reply = calloc(1, sizeof(*reply));
+				if (reply == NULL)
+					goto err;
+				reply->name = strdup(value);
+				if (reply->name == NULL)
+					goto err;
+			}
+		} else if (reply != NULL) {
+			if (strcmp(key, "Status") == 0) {
+				if (strcmp(value, "install") != 0) {
+					// Package deinstalled.
+					dD("Package \"%s\" has been deinstalled.", name);
+					dpkginfo_free_reply(reply);
+					reply = NULL;
+					continue;
+				}
+			} else if (strcmp(key, "Architecture") == 0) {
+				reply->arch = strdup(value);
+				if (reply->arch == NULL)
+					goto err;
+			} else if (strcmp(key, "Version") == 0) {
+				reply->evr = strdup(value);
+				if (reply->evr == NULL)
+					goto err;
+				if (version(reply) < 0)
+					goto err;
+			}
+		}
+	}
+
+	// Reached end of file.
+
+out:
+	if (reply != NULL) {
+		// Package found.
+		dD("Package \"%s\" found (arch=%s evr=%s epoch=%s version=%s release=%s).",
+			name, reply->arch, reply->evr, reply->epoch, reply->version, reply->release);
+		*err = 1;
+	}
+	fclose(f);
+	return reply;
+err:
+	dW("Insufficient memory available to allocate duplicate string.");
+	fclose(f);
+	dpkginfo_free_reply(reply);
+	*err = -1;
+	return NULL;
+}
+
+void dpkginfo_free_reply(struct dpkginfo_reply_t *reply)
+{
+	if (reply) {
+		free(reply->name);
+		free(reply->arch);
+		free(reply->epoch);
+		free(reply->release);
+		free(reply->version);
+		free(reply->evr);
+		free(reply);
+	}
+}