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From 0e48a7161be7fbabc02ba05407131be2595e9b6d Mon Sep 17 00:00:00 2001
From: Matej Tyc <matyc@redhat.com>
Date: Tue, 1 Dec 2020 18:46:20 +0100
Subject: [PATCH 1/4] Implement possibility to scan by sudoers.
- The remote scanning dialog got a "user is sudoer" checkbox.
- Dry run can make use of sudo in connection with oscap-ssh.
- The scanning procedure uses sudo invocation as part of the ssh command.
---
include/OscapScannerRemoteSsh.h | 2 ++
include/RemoteMachineComboBox.h | 2 ++
src/MainWindow.cpp | 4 ++++
src/OscapScannerRemoteSsh.cpp | 28 +++++++++++++++++++------
src/RemoteMachineComboBox.cpp | 7 +++++++
ui/RemoteMachineComboBox.ui | 36 +++++++++++++++++++++++++++++----
6 files changed, 69 insertions(+), 10 deletions(-)
diff --git a/include/OscapScannerRemoteSsh.h b/include/OscapScannerRemoteSsh.h
index d2aa7013..69eedfe4 100644
--- a/include/OscapScannerRemoteSsh.h
+++ b/include/OscapScannerRemoteSsh.h
@@ -36,6 +36,7 @@ class OscapScannerRemoteSsh : public OscapScannerBase
OscapScannerRemoteSsh();
virtual ~OscapScannerRemoteSsh();
+ void setUserIsSudoer(bool userIsSudoer);
virtual void setTarget(const QString& target);
virtual void setSession(ScanningSession* session);
@@ -57,6 +58,7 @@ class OscapScannerRemoteSsh : public OscapScannerBase
void removeRemoteDirectory(const QString& path, const QString& desc);
SshConnection mSshConnection;
+ bool mUserIsSudoer;
};
#endif
diff --git a/include/RemoteMachineComboBox.h b/include/RemoteMachineComboBox.h
index 41a9643c..3b338127 100644
--- a/include/RemoteMachineComboBox.h
+++ b/include/RemoteMachineComboBox.h
@@ -44,6 +44,7 @@ class RemoteMachineComboBox : public QWidget
void setRecentMachineCount(unsigned int count);
unsigned int getRecentMachineCount() const;
+ bool userIsSudoer() const;
public slots:
void notifyTargetUsed(const QString& target);
@@ -65,6 +66,7 @@ class RemoteMachineComboBox : public QWidget
QStringList mRecentTargets;
QComboBox* mRecentComboBox;
+ QCheckBox* mUserIsSudoer;
};
#endif
diff --git a/src/MainWindow.cpp b/src/MainWindow.cpp
index c9a0937b..236cfde1 100644
--- a/src/MainWindow.cpp
+++ b/src/MainWindow.cpp
@@ -678,6 +678,7 @@ void MainWindow::scanAsync(ScannerMode scannerMode)
// In the OscapScannerRemoteSsh class the port will be parsed out again...
const QString target = mUI.localMachineRadioButton->isChecked() ?
"localhost" : mUI.remoteMachineDetails->getTarget();
+ const bool userIsSudoer = mUI.remoteMachineDetails->userIsSudoer();
bool fetchRemoteResources = mUI.fetchRemoteResourcesCheckbox->isChecked();
try
@@ -689,7 +690,10 @@ void MainWindow::scanAsync(ScannerMode scannerMode)
if (target == "localhost")
mScanner = new OscapScannerLocal();
else
+ {
mScanner = new OscapScannerRemoteSsh();
+ ((OscapScannerRemoteSsh *)mScanner)->setUserIsSudoer(userIsSudoer);
+ }
mScanner->setTarget(target);
diff --git a/src/OscapScannerRemoteSsh.cpp b/src/OscapScannerRemoteSsh.cpp
index dcfd6d5f..d20faf59 100644
--- a/src/OscapScannerRemoteSsh.cpp
+++ b/src/OscapScannerRemoteSsh.cpp
@@ -37,7 +37,8 @@ extern "C"
OscapScannerRemoteSsh::OscapScannerRemoteSsh():
OscapScannerBase(),
- mSshConnection(this)
+ mSshConnection(this),
+ mUserIsSudoer(false)
{
mSshConnection.setCancelRequestSource(&mCancelRequested);
}
@@ -87,6 +88,11 @@ void OscapScannerRemoteSsh::setTarget(const QString& target)
mSshConnection.setPort(port);
}
+void OscapScannerRemoteSsh::setUserIsSudoer(bool userIsSudoer)
+{
+ mUserIsSudoer = userIsSudoer;
+}
+
void OscapScannerRemoteSsh::setSession(ScanningSession* session)
{
OscapScannerBase::setSession(session);
@@ -99,6 +105,10 @@ void OscapScannerRemoteSsh::setSession(ScanningSession* session)
QStringList OscapScannerRemoteSsh::getCommandLineArgs() const
{
QStringList args("oscap-ssh");
+ if (mUserIsSudoer)
+ {
+ args.append("--sudo");
+ }
args.append(mSshConnection.getTarget());
args.append(QString::number(mSshConnection.getPort()));
@@ -235,19 +245,19 @@ void OscapScannerRemoteSsh::evaluate()
if (mScannerMode == SM_OFFLINE_REMEDIATION)
{
- args = buildOfflineRemediationArgs(inputFile,
+ args.append(buildOfflineRemediationArgs(inputFile,
resultFile,
reportFile,
- arfFile);
+ arfFile));
}
else
{
- args = buildEvaluationArgs(inputFile,
+ args.append(buildEvaluationArgs(inputFile,
tailoringFile,
resultFile,
reportFile,
arfFile,
- mScannerMode == SM_SCAN_ONLINE_REMEDIATION);
+ mScannerMode == SM_SCAN_ONLINE_REMEDIATION));
}
const QString sshCmd = args.join(" ");
@@ -255,8 +265,14 @@ void OscapScannerRemoteSsh::evaluate()
emit infoMessage(QObject::tr("Starting the remote process..."));
QProcess process(this);
+ QString sudo;
+ if (mUserIsSudoer)
+ {
+ // tell sudo not to bother to read password from the terminal
+ sudo = " sudo -n";
+ }
- process.start(SCAP_WORKBENCH_LOCAL_SSH_PATH, baseArgs + QStringList(QString("cd '%1'; " SCAP_WORKBENCH_REMOTE_OSCAP_PATH " %2").arg(workingDir).arg(sshCmd)));
+ process.start(SCAP_WORKBENCH_LOCAL_SSH_PATH, baseArgs + QStringList(QString("cd '%1';" "%2 " SCAP_WORKBENCH_REMOTE_OSCAP_PATH " %3").arg(workingDir).arg(sudo).arg(sshCmd)));
process.waitForStarted();
if (process.state() != QProcess::Running)
diff --git a/src/RemoteMachineComboBox.cpp b/src/RemoteMachineComboBox.cpp
index 46d1b7d1..7b402344 100644
--- a/src/RemoteMachineComboBox.cpp
+++ b/src/RemoteMachineComboBox.cpp
@@ -41,6 +41,8 @@ RemoteMachineComboBox::RemoteMachineComboBox(QWidget* parent):
this, SLOT(updateHostPort(int))
);
+ mUserIsSudoer = mUI.userIsSudoer;
+
setRecentMachineCount(5);
syncFromQSettings();
@@ -51,6 +53,11 @@ RemoteMachineComboBox::~RemoteMachineComboBox()
delete mQSettings;
}
+bool RemoteMachineComboBox::userIsSudoer() const
+{
+ return mUserIsSudoer->isChecked();
+}
+
QString RemoteMachineComboBox::getTarget() const
{
return QString("%1:%2").arg(mUI.host->text()).arg(mUI.port->value());
diff --git a/ui/RemoteMachineComboBox.ui b/ui/RemoteMachineComboBox.ui
index 780d06ce..f9e9665c 100644
--- a/ui/RemoteMachineComboBox.ui
+++ b/ui/RemoteMachineComboBox.ui
@@ -6,15 +6,24 @@
<rect>
<x>0</x>
<y>0</y>
- <width>553</width>
- <height>29</height>
+ <width>609</width>
+ <height>42</height>
</rect>
</property>
<property name="windowTitle">
<string>RemoteMachineComboBox</string>
</property>
<layout class="QHBoxLayout" name="horizontalLayout">
- <property name="margin">
+ <property name="leftMargin">
+ <number>0</number>
+ </property>
+ <property name="topMargin">
+ <number>0</number>
+ </property>
+ <property name="rightMargin">
+ <number>0</number>
+ </property>
+ <property name="bottomMargin">
<number>0</number>
</property>
<item>
@@ -73,8 +82,17 @@
</item>
<item>
<widget class="QSpinBox" name="port">
+ <property name="enabled">
+ <bool>true</bool>
+ </property>
+ <property name="sizePolicy">
+ <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
+ <horstretch>0</horstretch>
+ <verstretch>0</verstretch>
+ </sizepolicy>
+ </property>
<property name="buttonSymbols">
- <enum>QAbstractSpinBox::UpDownArrows</enum>
+ <enum>QAbstractSpinBox::NoButtons</enum>
</property>
<property name="minimum">
<number>1</number>
@@ -87,6 +105,16 @@
</property>
</widget>
</item>
+ <item>
+ <widget class="QCheckBox" name="userIsSudoer">
+ <property name="toolTip">
+ <string>Check if the remote user doesn't have root privileges, but they can perform administrative tasks using paswordless sudo.</string>
+ </property>
+ <property name="text">
+ <string>user is sudoer</string>
+ </property>
+ </widget>
+ </item>
<item>
<widget class="QComboBox" name="recentComboBox">
<property name="sizePolicy">
From 1fd9bc807f1c76452c0803436efd311000d7470b Mon Sep 17 00:00:00 2001
From: Matej Tyc <matyc@redhat.com>
Date: Wed, 27 Jan 2021 14:33:04 +0100
Subject: [PATCH 2/4] Updated message handling of sudo-related issues.
---
include/OscapScannerRemoteSsh.h | 5 +++++
src/OscapScannerRemoteSsh.cpp | 23 +++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/include/OscapScannerRemoteSsh.h b/include/OscapScannerRemoteSsh.h
index 69eedfe4..280a69da 100644
--- a/include/OscapScannerRemoteSsh.h
+++ b/include/OscapScannerRemoteSsh.h
@@ -43,6 +43,11 @@ class OscapScannerRemoteSsh : public OscapScannerBase
virtual QStringList getCommandLineArgs() const;
virtual void evaluate();
+ protected:
+
+ virtual void selectError(MessageType& kind, const QString& message);
+ virtual void processError(QString& message);
+
private:
void ensureConnected();
diff --git a/src/OscapScannerRemoteSsh.cpp b/src/OscapScannerRemoteSsh.cpp
index d20faf59..69b51373 100644
--- a/src/OscapScannerRemoteSsh.cpp
+++ b/src/OscapScannerRemoteSsh.cpp
@@ -344,6 +344,29 @@ void OscapScannerRemoteSsh::evaluate()
signalCompletion(mCancelRequested);
}
+void OscapScannerRemoteSsh::selectError(MessageType& kind, const QString& message)
+{
+ OscapScannerBase::selectError(kind, message);
+ if (mUserIsSudoer)
+ {
+ if (message.contains(QRegExp("^sudo:")))
+ {
+ kind = MSG_ERROR;
+ }
+ }
+
+}
+
+void OscapScannerRemoteSsh::processError(QString& message)
+{
+ OscapScannerBase::processError(message);
+ if (mUserIsSudoer && message.contains(QRegExp("^sudo:")))
+ {
+ message.replace(QRegExp("^sudo:"), "Error invoking sudo on the host:");
+ message += ".\nOnly passwordless sudo setup on the remote host is supported by scap-workbench.";
+ }
+}
+
void OscapScannerRemoteSsh::ensureConnected()
{
if (mSshConnection.isConnected())
From 57097b3b9d6f85caa96ab2940c29e94f16382252 Mon Sep 17 00:00:00 2001
From: Matej Tyc <matyc@redhat.com>
Date: Thu, 28 Jan 2021 17:12:08 +0100
Subject: [PATCH 3/4] Added documentation about setting up passwordless sudo.
---
doc/user_manual.adoc | 11 +++++++++++
src/OscapScannerRemoteSsh.cpp | 2 ++
2 files changed, 13 insertions(+)
diff --git a/doc/user_manual.adoc b/doc/user_manual.adoc
index 29ebd919..2c8501a0 100644
--- a/doc/user_manual.adoc
+++ b/doc/user_manual.adoc
@@ -363,6 +363,17 @@ files are not supported yet!
.Selecting a remote machine for scanning
image::scanning_remote_machine.png[align="center"]
+The remote user doesn't have to be a superuser - you can setup the remote
+`/etc/sudoers` file (using `visudo`) to enable the paswordless sudo for that particular user,
+and you check the "user is sudoer" checkbox.
+
+For example, if the scanning user is `oscap-user`, that would involve putting
+
+ oscap-user ALL=(root) NOPASSWD: /usr/bin/oscap xccdf eval *
+
+user specification into the `sudoers` file, or into a separate file
+that is included by `sudoers` s.a. `/etc/sudoers.d/99-oscap-user`.
+
=== Enable Online Remediation (optional)
****
diff --git a/src/OscapScannerRemoteSsh.cpp b/src/OscapScannerRemoteSsh.cpp
index 69b51373..7fa38b2e 100644
--- a/src/OscapScannerRemoteSsh.cpp
+++ b/src/OscapScannerRemoteSsh.cpp
@@ -364,6 +364,8 @@ void OscapScannerRemoteSsh::processError(QString& message)
{
message.replace(QRegExp("^sudo:"), "Error invoking sudo on the host:");
message += ".\nOnly passwordless sudo setup on the remote host is supported by scap-workbench.";
+ message += " \nTo configure a non-privileged user oscap-user to run only the oscap binary as root, "
+ "add this User Specification to your sudoers file: oscap-user ALL=(root) NOPASSWD: /usr/bin/oscap xccdf eval *";
}
}
From e8daecc80ad54e95de764728f0cbe4863a67be0d Mon Sep 17 00:00:00 2001
From: Matej Tyc <matyc@redhat.com>
Date: Thu, 28 Jan 2021 17:45:09 +0100
Subject: [PATCH 4/4] Added suport for the sudoers checkbox to history.
Recent remote scans now encode the sudo mode into the "target" that is
stored in the recent remote hosts list.
---
include/OscapScannerRemoteSsh.h | 3 ++-
include/RemoteMachineComboBox.h | 2 +-
src/MainWindow.cpp | 5 ++++-
src/OscapScannerRemoteSsh.cpp | 30 +++++++++++++++++++++++-------
src/RemoteMachineComboBox.cpp | 17 +++++++++++------
5 files changed, 41 insertions(+), 16 deletions(-)
diff --git a/include/OscapScannerRemoteSsh.h b/include/OscapScannerRemoteSsh.h
index 280a69da..50214b80 100644
--- a/include/OscapScannerRemoteSsh.h
+++ b/include/OscapScannerRemoteSsh.h
@@ -31,11 +31,12 @@ class OscapScannerRemoteSsh : public OscapScannerBase
Q_OBJECT
public:
- static void splitTarget(const QString& in, QString& target, unsigned short& port);
+ static void splitTarget(const QString& in, QString& target, unsigned short& port, bool& userIsSudoer);
OscapScannerRemoteSsh();
virtual ~OscapScannerRemoteSsh();
+ bool getUserIsSudoer() const;
void setUserIsSudoer(bool userIsSudoer);
virtual void setTarget(const QString& target);
virtual void setSession(ScanningSession* session);
diff --git a/include/RemoteMachineComboBox.h b/include/RemoteMachineComboBox.h
index 3b338127..c2d946c9 100644
--- a/include/RemoteMachineComboBox.h
+++ b/include/RemoteMachineComboBox.h
@@ -47,7 +47,7 @@ class RemoteMachineComboBox : public QWidget
bool userIsSudoer() const;
public slots:
- void notifyTargetUsed(const QString& target);
+ void notifyTargetUsed(const QString& target, bool userIsSudoer);
void clearHistory();
protected slots:
diff --git a/src/MainWindow.cpp b/src/MainWindow.cpp
index 236cfde1..496e1724 100644
--- a/src/MainWindow.cpp
+++ b/src/MainWindow.cpp
@@ -763,7 +763,10 @@ void MainWindow::scanAsync(ScannerMode scannerMode)
);
if (target != "localhost")
- mUI.remoteMachineDetails->notifyTargetUsed(mScanner->getTarget());
+ {
+ bool userIsSudoer = ((OscapScannerRemoteSsh *)mScanner)->getUserIsSudoer();
+ mUI.remoteMachineDetails->notifyTargetUsed(mScanner->getTarget(), userIsSudoer);
+ }
mScanThread->start();
}
diff --git a/src/OscapScannerRemoteSsh.cpp b/src/OscapScannerRemoteSsh.cpp
index 7fa38b2e..b1c4426f 100644
--- a/src/OscapScannerRemoteSsh.cpp
+++ b/src/OscapScannerRemoteSsh.cpp
@@ -46,7 +46,7 @@ OscapScannerRemoteSsh::OscapScannerRemoteSsh():
OscapScannerRemoteSsh::~OscapScannerRemoteSsh()
{}
-void OscapScannerRemoteSsh::splitTarget(const QString& in, QString& target, unsigned short& port)
+void OscapScannerRemoteSsh::splitTarget(const QString& in, QString& target, unsigned short& port, bool& userIsSudoer)
{
// NB: We dodge a bullet here because the editor will always pass a port
// as the last component. A lot of checking and parsing does not need
@@ -56,10 +56,19 @@ void OscapScannerRemoteSsh::splitTarget(const QString& in, QString& target, unsi
// being there and always being the last component.
// FIXME: Ideally, this should split from the right side and stop after one split
- QStringList split = in.split(':');
+ userIsSudoer = false;
+ QStringList sudoerSplit = in.split(' ');
+ if (sudoerSplit.size() > 1)
+ {
+ if (sudoerSplit.at(1) == "sudo")
+ {
+ userIsSudoer = true;
+ }
+ }
+ QStringList hostPortSplit = sudoerSplit.at(0).split(':');
- const QString portString = split.back();
- split.removeLast();
+ const QString portString = hostPortSplit.back();
+ hostPortSplit.removeLast();
{
bool status = false;
@@ -69,25 +78,32 @@ void OscapScannerRemoteSsh::splitTarget(const QString& in, QString& target, unsi
port = status ? portCandidate : 22;
}
- target = split.join(":");
+ target = hostPortSplit.join(":");
}
void OscapScannerRemoteSsh::setTarget(const QString& target)
{
- OscapScannerBase::setTarget(target);
+ QStringList sudoerSplit = target.split(' ');
+ OscapScannerBase::setTarget(sudoerSplit.at(0));
if (mSshConnection.isConnected())
mSshConnection.disconnect();
QString cleanTarget;
unsigned short port;
+ bool userIsSudoer;
- splitTarget(target, cleanTarget, port);
+ splitTarget(target, cleanTarget, port, userIsSudoer);
mSshConnection.setTarget(cleanTarget);
mSshConnection.setPort(port);
}
+bool OscapScannerRemoteSsh::getUserIsSudoer() const
+{
+ return mUserIsSudoer;
+}
+
void OscapScannerRemoteSsh::setUserIsSudoer(bool userIsSudoer)
{
mUserIsSudoer = userIsSudoer;
diff --git a/src/RemoteMachineComboBox.cpp b/src/RemoteMachineComboBox.cpp
index 7b402344..127bdac7 100644
--- a/src/RemoteMachineComboBox.cpp
+++ b/src/RemoteMachineComboBox.cpp
@@ -30,7 +30,7 @@ RemoteMachineComboBox::RemoteMachineComboBox(QWidget* parent):
#if (QT_VERSION >= QT_VERSION_CHECK(4, 7, 0))
// placeholder text is only supported in Qt 4.7 onwards
- mUI.host->setPlaceholderText(QObject::tr("username@hostname"));
+ mUI.host->setPlaceholderText(QObject::tr("username@hostname [sudo]"));
#endif
mQSettings = new QSettings(this);
@@ -77,11 +77,12 @@ unsigned int RemoteMachineComboBox::getRecentMachineCount() const
return mRecentTargets.size();
}
-void RemoteMachineComboBox::notifyTargetUsed(const QString& target)
+void RemoteMachineComboBox::notifyTargetUsed(const QString& target, bool userIsSudoer)
{
QString host;
unsigned short port;
- OscapScannerRemoteSsh::splitTarget(target, host, port);
+ bool placeholder;
+ OscapScannerRemoteSsh::splitTarget(target, host, port, placeholder);
// skip invalid suggestions
if (host.isEmpty() || port == 0)
@@ -90,7 +91,8 @@ void RemoteMachineComboBox::notifyTargetUsed(const QString& target)
const unsigned int machineCount = getRecentMachineCount();
// this moves target to the beginning of the list if it was in the list already
- mRecentTargets.prepend(target);
+ QString targetWithSudo = target + (userIsSudoer ? " sudo" : "");
+ mRecentTargets.prepend(targetWithSudo);
mRecentTargets.removeDuplicates();
setRecentMachineCount(machineCount);
@@ -106,6 +108,7 @@ void RemoteMachineComboBox::clearHistory()
{
mUI.host->setText("");
mUI.port->setValue(22);
+ mUI.userIsSudoer->setChecked(false);
const unsigned int machineCount = getRecentMachineCount();
mRecentTargets.clear();
@@ -167,6 +170,7 @@ void RemoteMachineComboBox::updateHostPort(int index)
{
mUI.host->setText("");
mUI.port->setValue(22);
+ mUI.userIsSudoer->setChecked(false);
return;
}
@@ -179,10 +183,11 @@ void RemoteMachineComboBox::updateHostPort(int index)
QString host;
unsigned short port;
+ bool userIsSudoer;
- OscapScannerRemoteSsh::splitTarget(target, host, port);
+ OscapScannerRemoteSsh::splitTarget(target, host, port, userIsSudoer);
mUI.host->setText(host);
mUI.port->setValue(port);
-
+ mUI.userIsSudoer->setChecked(userIsSudoer);
}
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