enarx 0.1.1

Enarx Keep Loader
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// SPDX-License-Identifier: Apache-2.0

use crate::backend::probe::x86_64::{CpuId, Vendor};
use crate::backend::Datum;

use sgx::parameters::{Features, MiscSelect, Xfrm};

use std::arch::x86_64::__cpuid_count;
use std::fs::File;
use std::mem::transmute;
use std::str::from_utf8;

fn humanize(mut size: f64) -> (f64, &'static str) {
    let mut iter = 0;

    while size > 512.0 {
        size /= 1024.0;
        iter += 1;
    }

    let suffix = match iter {
        0 => "",
        1 => "KiB",
        2 => "MiB",
        3 => "GiB",
        4 => "TiB",
        5 => "PiB",
        6 => "EiB",
        7 => "ZiB",
        8 => "YiB",
        _ => panic!("Size unsupported!"),
    };

    (size, suffix)
}

pub const CPUIDS: &[CpuId] = &[
    CpuId {
        name: "CPU Manufacturer",
        leaf: 0x00000000,
        subl: 0x00000000,
        func: |res| {
            let name: [u8; 12] = unsafe { transmute([res.ebx, res.edx, res.ecx]) };
            let name = from_utf8(&name[..]).unwrap();
            (name == "GenuineIntel", Some(name.into()))
        },
        vend: None,
    },
    CpuId {
        name: " SGX Support",
        leaf: 0x00000007,
        subl: 0x00000000,
        func: |res| (res.ebx & (1 << 2) != 0, None),
        vend: Some(Vendor::Intel),
    },
    CpuId {
        name: "  Version 1",
        leaf: 0x00000012,
        subl: 0x00000000,
        func: |res| (res.eax & (1 << 0) != 0, None),
        vend: Some(Vendor::Intel),
    },
    CpuId {
        name: "  Version 2",
        leaf: 0x00000012,
        subl: 0x00000000,
        func: |res| (res.eax & (1 << 1) != 0, None),
        vend: Some(Vendor::Intel),
    },
    CpuId {
        name: "  FLC Support",
        leaf: 0x00000007,
        subl: 0x00000000,
        func: |res| (res.ecx & (1 << 30) != 0, None),
        vend: Some(Vendor::Intel),
    },
    CpuId {
        name: "  Max Size (32-bit)",
        leaf: 0x00000012,
        subl: 0x00000000,
        func: |res| {
            let bits = res.edx as u8;
            let (n, s) = humanize((1u64 << bits) as f64);
            (true, Some(format!("{:.0} {}", n, s)))
        },
        vend: Some(Vendor::Intel),
    },
    CpuId {
        name: "  Max Size (64-bit)",
        leaf: 0x00000012,
        subl: 0x00000000,
        func: |res| {
            let bits = res.edx >> 8 & 0xff;
            let (n, s) = humanize((1u64 << bits) as f64);
            (true, Some(format!("{:.0} {}", n, s)))
        },
        vend: Some(Vendor::Intel),
    },
    CpuId {
        name: "  MiscSelect",
        leaf: 0x00000012,
        subl: 0x00000000,
        func: |res| match MiscSelect::from_bits(res.ebx) {
            Some(ms) => (true, Some(format!("{:?}", ms))),
            None => (false, None),
        },
        vend: Some(Vendor::Intel),
    },
    CpuId {
        name: "  Features",
        leaf: 0x00000012,
        subl: 0x00000001,
        func: |res| match Features::from_bits((res.ebx as u64) << 32 | res.eax as u64) {
            Some(features) => (true, Some(format!("{:?}", features))),
            None => (false, None),
        },
        vend: Some(Vendor::Intel),
    },
    CpuId {
        name: "  Xfrm",
        leaf: 0x00000012,
        subl: 0x00000001,
        func: |res| match Xfrm::from_bits((res.edx as u64) << 32 | res.ecx as u64) {
            Some(flags) => (true, Some(format!("{:?}", flags))),
            None => (false, None),
        },
        vend: Some(Vendor::Intel),
    },
];

pub fn epc_size(max: u32) -> Datum {
    let mut pass = false;
    let mut info = None;

    if max >= 0x00000012 {
        let mut size = 0;

        for i in 2.. {
            let result = unsafe { __cpuid_count(0x00000012, i) };
            if result.eax & 0xf != 1 {
                break;
            }

            let low = result.ecx as u64 & 0xfffff000;
            let high = result.edx as u64 & 0x000fffff;
            size += high << 12 | low;
        }

        let (n, s) = humanize(size as f64);
        info = Some(format!("{:.0} {}", n, s));
        pass = true;
    }

    Datum {
        name: "  EPC Size".into(),
        mesg: None,
        pass,
        info,
    }
}

pub fn dev_sgx_enclave() -> Datum {
    let mut pass = false;

    if File::open("/dev/sgx_enclave").is_ok() {
        pass = true;
    }

    Datum {
        name: "Driver".into(),
        pass,
        info: Some("/dev/sgx_enclave".into()),
        mesg: None,
    }
}