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  • Committer: Teddy Hogeborn
  • Date: 2024-11-17 16:53:00 UTC
  • mto: This revision was merged to the branch mainline in revision 412.
  • Revision ID: teddy@recompile.se-20241117165300-02hxm96s8cj9528e
mandos: Avoid closing configured server network socket

If we are passed a pre-created created network socket as a file
descriptor, we must avoid later closing it (when stdin, stdout and
stderr are dup2()ed over with /dev/null) by making sure that the
network file descriptor is not 0, 1, or 2, by creating a new file
descriptor if necessary.

However, when we create a new file descriptor we must check that the
new file descriptor is not 0, 1, or 2 either, and try again until we
get a suitable file descriptor.

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Lines of Context:
dracut-module/module-setup.sh
 
1
#!/bin/sh
 
2
#
 
3
# This file should be present in the root file system directory
 
4
# /usr/lib/dracut/modules.d/90mandos.  When dracut creates the
 
5
# initramfs image, dracut will source this file and run the shell
 
6
# functions defined in this file: "install", "check", "depends",
 
7
# "cmdline", and "installkernel".
 
8
# 
 
9
# Despite the above #!/bin/sh line and the executable flag, this file
 
10
# is not executed; this file is sourced by dracut when creating the
 
11
# initramfs image file.
 
12
 
 
13
mandos_libdir(){
 
14
    for dir in /usr/lib \
 
15
        "/usr/lib/`dpkg-architecture -qDEB_HOST_MULTIARCH 2>/dev/null`" \
 
16
        "`rpm --eval='%{_libdir}' 2>/dev/null`" /usr/local/lib; do
 
17
        if [ -d "$dir"/mandos ]; then
 
18
            echo "$dir"/mandos
 
19
            return
 
20
        fi
 
21
    done
 
22
    # Mandos not found
 
23
    return 1
 
24
}
 
25
 
 
26
mandos_keydir(){
 
27
    for dir in /etc/keys/mandos /etc/mandos/keys; do
 
28
        if [ -d "$dir" ]; then
 
29
            echo "$dir"
 
30
            return
 
31
        fi
 
32
    done
 
33
    # Mandos key directory not found
 
34
    return 1
 
35
}
 
36
 
 
37
check(){
 
38
    if [ "${hostonly:-no}" = "no" ]; then
 
39
        dwarning "Mandos: Dracut not in hostonly mode"
 
40
        return 1
 
41
    fi
 
42
 
 
43
    local libdir=`mandos_libdir`
 
44
    if [ -z "$libdir" ]; then
 
45
        dwarning "Mandos lib directory not found"
 
46
        return 1
 
47
    fi
 
48
 
 
49
    local keydir=`mandos_keydir`
 
50
    if [ -z "$keydir" ]; then
 
51
        dwarning "Mandos key directory not found"
 
52
        return 1
 
53
    fi
 
54
}
 
55
 
 
56
install(){
 
57
    chmod go+w,+t "$initdir"/tmp
 
58
    local libdir=`mandos_libdir`
 
59
    local keydir=`mandos_keydir`
 
60
    set `{ getent passwd _mandos \
 
61
        || getent passwd nobody \
 
62
        || echo ::65534:65534:::; } \
 
63
        | cut --delimiter=: --fields=3,4 --only-delimited \
 
64
        --output-delimiter=" "`
 
65
    local mandos_user="$1"
 
66
    local mandos_group="$2"
 
67
    inst "${libdir}" /lib/mandos
 
68
    if dracut_module_included "systemd"; then
 
69
        plugindir=/lib/mandos
 
70
        inst "${libdir}/plugins.d/mandos-client" \
 
71
             "${plugindir}/mandos-client"
 
72
        chmod u-s "${initdir}/${plugindir}/mandos-client"
 
73
        inst "${moddir}/ask-password-mandos.service" \
 
74
             "${systemdsystemunitdir}/ask-password-mandos.service"
 
75
        if [ -d /etc/systemd/system/ask-password-mandos.service.d ]; then
 
76
            inst /etc/systemd/system/ask-password-mandos.service.d
 
77
            inst_multiple -o /etc/systemd/system/ask-password-mandos.service.d/*.conf
 
78
        fi
 
79
        if [ ${mandos_user} != 65534 ]; then
 
80
            sed --in-place \
 
81
                --expression="s,^ExecStart=/lib/mandos/password-agent ,&--user=${mandos_user} ," \
 
82
                "${initdir}/${systemdsystemunitdir}/ask-password-mandos.service"
 
83
        fi
 
84
        if [ ${mandos_group} != 65534 ]; then
 
85
            sed --in-place \
 
86
                --expression="s,^ExecStart=/lib/mandos/password-agent ,&--group=${mandos_group} ," \
 
87
                "${initdir}/${systemdsystemunitdir}/ask-password-mandos.service"
 
88
        fi
 
89
    else
 
90
        inst_hook cmdline 20 "$moddir"/cmdline-mandos.sh
 
91
        plugindir=/lib/mandos/plugins.d
 
92
        inst "${libdir}/plugin-runner" /lib/mandos/plugin-runner
 
93
        inst /etc/mandos/plugin-runner.conf
 
94
        sed --in-place \
 
95
            --expression='1i--options-for=mandos-client:--pubkey=/etc/mandos/keys/pubkey.txt,--seckey=/etc/mandos/keys/seckey.txt,--tls-pubkey=/etc/mandos/keys/tls-pubkey.pem,--tls-privkey=/etc/mandos/keys/tls-privkey.pem' \
 
96
            "${initdir}/etc/mandos/plugin-runner.conf"
 
97
        if [ ${mandos_user} != 65534 ]; then
 
98
            sed --in-place --expression="1i--userid=${mandos_user}" \
 
99
                "${initdir}/etc/mandos/plugin-runner.conf"
 
100
        fi
 
101
        if [ ${mandos_group} != 65534 ]; then
 
102
            sed --in-place \
 
103
                --expression="1i--groupid=${mandos_group}" \
 
104
                "${initdir}/etc/mandos/plugin-runner.conf"
 
105
        fi
 
106
        inst "${libdir}/plugins.d" "$plugindir"
 
107
        chown ${mandos_user}:${mandos_group} "${initdir}/${plugindir}"
 
108
        # Copy the packaged plugins
 
109
        for file in "$libdir"/plugins.d/*; do
 
110
            base="`basename \"$file\"`"
 
111
            # Is this plugin overridden?
 
112
            if [ -e "/etc/mandos/plugins.d/$base" ]; then
 
113
                continue
 
114
            fi
 
115
            case "$base" in
 
116
                *~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
 
117
                    : ;;
 
118
                "*") dwarning "Mandos client plugin directory is empty." >&2 ;;
 
119
                askpass-fifo) : ;; # Ignore packaged for dracut
 
120
                *) inst "${file}" "${plugindir}/${base}" ;;
 
121
            esac
 
122
        done
 
123
        # Copy any user-supplied plugins
 
124
        for file in /etc/mandos/plugins.d/*; do
 
125
            base="`basename \"$file\"`"
 
126
            case "$base" in
 
127
                *~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
 
128
                    : ;;
 
129
                "*") : ;;
 
130
                *) inst "$file" "${plugindir}/${base}" ;;
 
131
            esac
 
132
        done
 
133
        # Copy any user-supplied plugin helpers
 
134
        for file in /etc/mandos/plugin-helpers/*; do
 
135
            base="`basename \"$file\"`"
 
136
            case "$base" in
 
137
                *~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
 
138
                    : ;;
 
139
                "*") : ;;
 
140
                *) inst "$file" "/lib/mandos/plugin-helpers/$base";;
 
141
            esac
 
142
        done
 
143
    fi
 
144
    # Copy network hooks
 
145
    for hook in /etc/mandos/network-hooks.d/*; do
 
146
        basename=`basename "$hook"`
 
147
        case "$basename" in
 
148
            "*") continue ;;
 
149
            *[!A-Za-z0-9_.-]*) continue ;;
 
150
            *) test -d "$hook" || inst "$hook" "/lib/mandos/network-hooks.d/$basename" ;;
 
151
        esac
 
152
        if [ -x "$hook" ]; then
 
153
            # Copy any files needed by the network hook
 
154
            MANDOSNETHOOKDIR=/etc/mandos/network-hooks.d MODE=files \
 
155
                VERBOSITY=0 "$hook" files | while read file target; do
 
156
                if [ ! -e "${file}" ]; then
 
157
                    dwarning "WARNING: file ${file} not found, requested by Mandos network hook '${basename}'" >&2
 
158
                fi
 
159
                if [ -z "${target}" ]; then
 
160
                    inst "$file"
 
161
                else
 
162
                    inst "$file" "$target"
 
163
                fi
 
164
            done
 
165
        fi
 
166
    done
 
167
    # Copy the packaged plugin helpers
 
168
    for file in "$libdir"/plugin-helpers/*; do
 
169
        base="`basename \"$file\"`"
 
170
        # Is this plugin overridden?
 
171
        if [ -e "/etc/mandos/plugin-helpers/$base" ]; then
 
172
            continue
 
173
        fi
 
174
        case "$base" in
 
175
            *~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
 
176
                : ;;
 
177
            "*") : ;;
 
178
            *) inst "$file" "/lib/mandos/plugin-helpers/$base";;
 
179
        esac
 
180
    done
 
181
    local gpg=/usr/bin/gpg
 
182
    if [ -e /usr/bin/gpgconf ]; then
 
183
        inst /usr/bin/gpgconf
 
184
        gpg="`/usr/bin/gpgconf|sed --quiet --expression='s/^gpg:[^:]*://p'`"
 
185
        gpgagent="`/usr/bin/gpgconf|sed --quiet --expression='s/^gpg-agent:[^:]*://p'`"
 
186
        # Newer versions of GnuPG 2 requires the gpg-agent binary
 
187
        if [ -e "$gpgagent" ]; then
 
188
            inst "$gpgagent"
 
189
        fi
 
190
    fi
 
191
    inst "$gpg"
 
192
    if dracut_module_included "systemd"; then
 
193
        inst "${moddir}/password-agent" /lib/mandos/password-agent
 
194
        inst "${moddir}/ask-password-mandos.path" \
 
195
             "${systemdsystemunitdir}/ask-password-mandos.path"
 
196
        ln_r "${systemdsystemunitdir}/ask-password-mandos.path" \
 
197
             "${systemdsystemunitdir}/sysinit.target.wants/ask-password-mandos.path"
 
198
    fi
 
199
    # Key files
 
200
    for file in "$keydir"/*; do
 
201
        if [ -d "$file" ]; then
 
202
            continue
 
203
        fi
 
204
        case "$file" in
 
205
            *~|.*|\#*\#|*.dpkg-old|*.dpkg-bak|*.dpkg-new|*.dpkg-divert)
 
206
                : ;;
 
207
            "*") : ;;
 
208
            *)
 
209
                inst "$file" "/etc/mandos/keys/`basename \"$file\"`"
 
210
                chown ${mandos_user}:${mandos_group} \
 
211
                      "${initdir}/etc/mandos/keys/`basename \"$file\"`"
 
212
                if [ `basename "$file"` = dhparams.pem ]; then
 
213
                    # Use Diffie-Hellman parameters file
 
214
                    if dracut_module_included "systemd"; then
 
215
                        sed --in-place \
 
216
                            --expression='/^ExecStart/s/ \$MANDOS_CLIENT_OPTIONS/ --dh-params=\/etc\/mandos\/keys\/dhparams.pem&/' \
 
217
                            "${initdir}/${systemdsystemunitdir}/ask-password-mandos.service"
 
218
                    else
 
219
                        sed --in-place \
 
220
                            --expression="1i--options-for=mandos-client:--dh-params=/etc/mandos/keys/dhparams.pem" \
 
221
                            "${initdir}/etc/mandos/plugin-runner.conf"
 
222
                    fi
 
223
                fi
 
224
                ;;
 
225
        esac
 
226
    done
 
227
}
 
228
 
 
229
installkernel(){
 
230
    instmods =drivers/net
 
231
    hostonly='' instmods ipv6
 
232
    # Copy any kernel modules needed by network hooks
 
233
    for hook in /etc/mandos/network-hooks.d/*; do
 
234
        basename=`basename "$hook"`
 
235
        case "$basename" in
 
236
            "*") continue ;;
 
237
            *[!A-Za-z0-9_.-]*) continue ;;
 
238
        esac
 
239
        if [ -x "$hook" ]; then
 
240
            # Copy and load any modules needed by the network hook
 
241
            MANDOSNETHOOKDIR=/etc/mandos/network-hooks.d MODE=modules \
 
242
                VERBOSITY=0 "$hook" modules | while read module; do
 
243
                if [ -z "${target}" ]; then
 
244
                    instmods "$module"
 
245
                fi
 
246
            done
 
247
        fi
 
248
    done
 
249
}
 
250
 
 
251
depends(){
 
252
    echo crypt
 
253
}
 
254
 
 
255
cmdline(){
 
256
    :
 
257
}