72 lines
2.4 KiB
Bash
72 lines
2.4 KiB
Bash
declare -a hardeningCFlags=()
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declare -A hardeningEnableMap=()
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# Intentionally word-split in case 'NIX_HARDENING_ENABLE' is defined in Nix. The
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# array expansion also prevents undefined variables from causing trouble with
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# `set -u`.
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for flag in ${NIX_HARDENING_ENABLE_@suffixSalt@-}; do
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hardeningEnableMap["$flag"]=1
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done
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# Remove unsupported flags.
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for flag in @hardening_unsupported_flags@; do
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unset -v "hardeningEnableMap[$flag]"
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done
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if (( "${NIX_DEBUG:-0}" >= 1 )); then
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declare -a allHardeningFlags=(fortify stackprotector pie pic strictoverflow format)
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declare -A hardeningDisableMap=()
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# Determine which flags were effectively disabled so we can report below.
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for flag in "${allHardeningFlags[@]}"; do
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if [[ -z "${hardeningEnableMap[$flag]-}" ]]; then
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hardeningDisableMap["$flag"]=1
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fi
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done
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printf 'HARDENING: disabled flags:' >&2
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(( "${#hardeningDisableMap[@]}" )) && printf ' %q' "${!hardeningDisableMap[@]}" >&2
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echo >&2
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if (( "${#hardeningEnableMap[@]}" )); then
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echo 'HARDENING: Is active (not completely disabled with "all" flag)' >&2;
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fi
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fi
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for flag in "${!hardeningEnableMap[@]}"; do
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case $flag in
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fortify)
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if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling fortify >&2; fi
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hardeningCFlags+=('-O2' '-D_FORTIFY_SOURCE=2')
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;;
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stackprotector)
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if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling stackprotector >&2; fi
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hardeningCFlags+=('-fstack-protector-strong' '--param' 'ssp-buffer-size=4')
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;;
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pie)
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if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling CFlags -fPIE >&2; fi
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hardeningCFlags+=('-fPIE')
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if [[ ! ("$*" =~ " -shared " || "$*" =~ " -static ") ]]; then
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if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling LDFlags -pie >&2; fi
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hardeningCFlags+=('-pie')
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fi
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;;
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pic)
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if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling pic >&2; fi
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hardeningCFlags+=('-fPIC')
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;;
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strictoverflow)
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if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling strictoverflow >&2; fi
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hardeningCFlags+=('-fno-strict-overflow')
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;;
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format)
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if (( "${NIX_DEBUG:-0}" >= 1 )); then echo HARDENING: enabling format >&2; fi
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hardeningCFlags+=('-Wformat' '-Wformat-security' '-Werror=format-security')
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;;
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*)
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# Ignore unsupported. Checked in Nix that at least *some*
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# tool supports each flag.
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;;
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esac
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done
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