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# Debugging Tips
A lot of behaviour in this authentication process relies on functions in the KRB5 system libraries. This page aims to
document how to create a debuggable build of MIT KRB5.
## Debugging MIT KRB5
```bash
# docker run --rm -it fedora:34 /bin/bash
dnf install -y \
autoconf \
automake \
byacc \
diffutils \
findutils \
gcc \
gettext \
git \
libtool \
libunistring-devel \
make \
openssl-devel \
python \
python-devel \
python-pip \
zlib-devel
pushd /tmp
git clone https://github.com/krb5/krb5.git
pushd krb5/src
autoreconf -f -i
./configure CFLAGS=-g
make CFLAGS=-g
make install DESTDIR=/opt/krb5-src
export PATH=/opt/krb5-src/usr/local/bin:$PATH
export LD_LIBRARY_PATH=/opt/krb5-src/usr/local/lib:$LD_LIBRARY_PATH
popd
git clone https://github.com/gssapi/gss-ntlmssp.git
pushd gss-ntlmssp
autoreconf -f -i
CFLAGS="-I/opt/krb5-src/usr/local/include -g" \
LDFLAGS="-L/opt/krb5-src/usr/local/lib -Wl,-rpath=/opt/krb5-src/usr/local/lib" \
./configure \
--prefix=/opt/gss-ntlmssp \
--with-wbclient=no \
--with-manpages=no
echo "gssntlmssp_v1 1.3.6.1.4.1.311.2.2.10 /opt/gss-ntlmssp/lib/gssntlmssp/gssntlmssp.so" > /tmp/krb-mechs.conf
export GSS_MECH_CONFIG=/tmp/krb-mechs.conf
git clone https://github.com/pythongssapi/python-gssapi.git
pushd python-gssapi
pip install Cython wheel
GSSAPI_LINKER_ARGS="-L/opt/krb5-src/usr/local/lib -L/usr/local/lib -Wl,--enable-new-dtags -Wl,-rpath -Wl,/opt/krb5-src/usr/local/lib -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err" \
GSSAPI_COMPILER_ARGS="-I/opt/krb5-src/usr/local/include -I/usr/local/include -DHAS_GSSAPI_EXT_H" \
python setup.py bdist_wheel
pip install dist/gssapi-*.whl
popd
popd
```
## Debugging Heimdal KRb5
```bash
# docker run --rm -it fedora:34 /bin/bash
dnf install -y \
autoconf \
automake \
byacc \
flex \
libtool \
make \
ncurses-devel \
perl-JSON \
python \
python-devel \
python-pip \
texinfo \
git
pushd /tmp
git clone https://github.com/heimdal/heimdal.git
pushd heimdal
autoreconf -f -i
./configure CFLAGS=-g --prefix="/opt/heimdal-src" --disable-otp
# https://github.com/heimdal/heimdal/issues/794
cp ./lib/libedit/src/vis.h include/
make CFLAGS=-g
make install
popd
git clone https://github.com/pythongssapi/python-gssapi.git
pushd python-gssapi
pip install Cython wheel
GSSAPI_LINKER_ARGS="$(/opt/heimdal-src/bin/krb5-config --libs gssapi)" \
GSSAPI_COMPILER_ARGS="$(/opt/heimdal-src/bin/krb5-config --cflags gssapi)" \
GSSAPI_MAIN_LIB="/opt/heimdal-src/lib/libgssapi.so" \
python setup.py bdist_wheel
pip install dist/gssapi-*.whl
popd
popd
```
## Setting up Linux KDC
Here are some commands to run to set up a KDC inside a docker container. This is mostly just a way to test out various
scenarios against the different packages. The username created is `admin@DOMAIN.LOCAL` with the password `password`.
### MIT KRB5
```bash
HOSTNAME=$(hostname)
REALM=domain.local
USERNAME=admin
PASSWORD=password
yum install -y epel-release
yum install -y \
gcc \
gssntlmssp \
krb5-devel \
krb5-server \
krb5-workstation \
python3 \
python3-devel \
python3-pip \
vim
echo -e "127.0.0.1\t$HOSTNAME.$REALM" >> /etc/hosts
cat > /etc/krb5.conf <<EOL
[libdefaults]
default_realm = ${REALM^^}
dns_lookup_realm = false
dns_lookup_kdc = false
[realms]
${REALM^^} = {
kdc = ${HOSTNAME,,}.${REALM,,}
admin_server = ${HOSTNAME,,}.${REALM,,}
}
[domain_realm]
.${REALM,,} = ${REALM^^}
${REALM,,} = ${REALM^^}
EOL
echo -e "*/*@${REALM^^}\t*" > /var/kerberos/krb5kdc/kadm5.acl
# Create the new realm
echo -e "$PASSWORD\n$PASSWORD" | /usr/sbin/kdb5_util create -r ${REALM^^}
# Create the user principal
kadmin.local -q "addprinc -pw $PASSWORD $USERNAME"
# Create the SPNs and add it to the /etc/krb5.keytab
kadmin.local -q "addprinc -randkey host/$HOSTNAME@${REALM^^}"
kadmin.local -q "ktadd -k /etc/krb5.keytab host/$HOSTNAME@${REALM^^}"
kadmin.local -q "addprinc -randkey host/${HOSTNAME^^}@${REALM^^}"
kadmin.local -q "ktadd -k /etc/krb5.keytab host/${HOSTNAME^^}@${REALM^^}"
# Start the KDC service
/usr/sbin/krb5kdc
pip3 install gssapi
```
### Heimdal
```bash
HOSTNAME=$(hostname)
REALM=domain.local
USERNAME=admin
PASSWORD=password
yum install -y epel-release
yum install -y \
gcc \
heimdal-devel \
heimdal-libs \
heimdal-path \
heimdal-server \
heimdal-workstation \
python3 \
python3-devel \
python3-pip \
vim
source /etc/profile # Ensure the Heimdal binaries are in the PATH
echo -e "127.0.0.1\t$HOSTNAME.$REALM" >> /etc/hosts
cat > /etc/krb5.conf <<EOL
[libdefaults]
default_realm = ${REALM^^}
dns_lookup_realm = false
dns_lookup_kdc = false
[realms]
${REALM^^} = {
kdc = ${HOSTNAME,,}.${REALM,,}
admin_server = ${HOSTNAME,,}.${REALM,,}
}
[domain_realm]
.${REALM,,} = ${REALM^^}
${REALM,,} = ${REALM^^}
EOL
echo -e "*/*@${REALM^^}\t*" > /var/heimdal/kadmind.acl
# Create the new realm
echo -e "\n\n" | kadmin -l init ${REALM^^}
# Create the user principal
kadmin -l add --use-defaults --password=$PASSWORD $USERNAME
# Create the SPNs and add it to the /etc/krb5.keytab
kadmin -l add --random-key --use-defaults host/$HOSTNAME@${REALM^^}
kadmin -l ext --keytab=/etc/krb5.keytab host/$HOSTNAME@${REALM^^}
kadmin -l add --random-key --use-defaults host/${HOSTNAME^^}@${REALM^^}
kadmin -l ext --keytab=/etc/krb5.keytab host/${HOSTNAME^^}@${REALM^^}
# Start the KDC service
/usr/libexec/kdc --detach
pip3 install gssapi
```
|
