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KLAB EXPERT CAMP Ռൃද খ ً
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ࣗݾհ • ւಓେֶ ใΤϨΫτϩχΫεֶՊ 4 • དྷ͠·͢ • seccamp(2018), SecHack365(2017) খ ً @teru0x1
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ࢲͷςʔϚ RustͰTCPͷ࣮
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ͳͥRUST͔ • CݴޠฒΈͷߴ͍ύϑΥʔϚϯε • ܕ҆શੑɺϝϞϦ҆શੑ - ະఆٛಈ࡞͕ൃੜ͠ͳ͍ - ແޮͳϙΠϯλ࡞͞Εͳ͍ʢ͔ؔΒϩʔΧϧมͷϙΠ ϯλΛฦ͢ͳͲʣ - ίϯύΠϧ௨ͬͨ࣌ͷ҆৺ײ͕͍͢͝ • ߴ͍දݱྗ(ΫϩʔδϟɺΠςϨʔλ) • ॆ࣮ͨ͠ඪ४ϥΠϒϥϦʢϋογϡςʔϒϧɺλϓϧʣ
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༷ͳͲ • TCPͷιέοτϥΠϒϥϦͱͯ͠ΞϓϦέʔγϣϯ͔Βར༻Ͱ͖Δ Α͏ʹͨ͠ • ࣮ͨ͠API - connect(): 3-way-handshakeΛߦ͍ଓΛཱ֬͢Δ - bind(): Ϧεχϯάιέοτͷੜɺࢦఆͨ͠ΞυϨεͰϦοεϯ - accept(): ଓࡁΈιέοτΛฦ͢ - read(): ଓࡁΈιέοτ͔ΒಡΈࠐΉ - write(): ଓࡁΈιέοτॻ͖ࠐΉ • ࠶ૹ੍ޚ
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࣮ʹ͍ͭͯ • TCP/IPࣗ࡞ຊɺmicropsͷ࣮Λ͔ͳΓࢀߟʹͨ͠ɻ • l3·ͰpnetΫϨʔτΛར༻ʢνΣοΫαϜͳͲϥΠϒϥϦΛ ͏ʣ • ϥΠϒϥϦΛར༻͢ΔΞϓϦέʔγϣϯͱͯ͠echoαʔόɺΫϥ ΠΞϯτΛ࡞ͨ͠ɻ
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8/26 • ඈߦػͰඈΜͰ͘Δ • ݐͷೖΓํ͕Θ͔Βͳ͔ͬͨ • ͓ण͓͍͍࢘͠ • APIͷܗΛ࡞Δ • ઃܭʹۤ࿑͢ΔʢTCPͷཧςʔϒϧͲ͜ʹ࣋ͨͤΑ͏ʁʣ
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8/27 • 3-way-handshakeୡ
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8/28 • connect(), read(), write()Λ࣮ • TCPΫϥΠΞϯτͷػೳྃ • bind()Λ࣮ɺαʔόʔͬΆ͍͜ͱ͕Ͱ͖ΔΑ͏ʹͳͬͨ • ͜ͷ࣌1ϙʔτ1ଓͩͬͨ
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8/29 • accept()Λ࣮ • ࠶ૹ੍ޚΛ࣮
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σϞ • ಈ͍͍͓ͯͩ͘͞ئ͍͠·͢ • echoαʔόVMʢUbuntuʣ, ΫϥΠΞϯτmacOSͰ͢
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େมͩͬͨͱ͜Ζ • ࣗ࡞TCP͕͍ͬͯΔVMͷΧʔωϧ͕֎෦͔ΒདྷͨSYNʹରͯ͠ RSTΛฦ͢ - iptablesͰ֎͖ͷRSTυϩοϓͨ͠ • RustͷίϯύΠϧΛ௨͢͜ͱ
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͞Γ͛ͳ͘એ • ιέοτϓϩάϥϛϯά • ύέοτΩϟϓνϟ • ϙʔτεΩϟϯπʔϧ • non-blocking web αʔό • DHCPαʔό
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ײͳͲ • TCPશʹཧղͨ͠ งғؾ͕গ͠Θ͔ΔΑ͏ʹͳͬͨ - ίωΫγϣϯཧͷख๏͕Θ͔ͬͨ - ঢ়ଶΛ࣋ͭͱҰؾʹෳࡶʹͳΔ • 1ʹҰճσουϩοΫͰϋϚͬͨ - ͰɺʮσουϩοΫͯ͠ΔΑʂʯͱॲཧܥ͕ڭ͑ͯ͘ΕΔ • ggͬͯग़ͯ͜ͳ͍ਂ͍ࣝʹ͍࣭ͭͯͰ͖ͯษڧʹͳͬͨɻ • ߨٛͷํฉ͍ͯΈ͔ͨͬͨ • Rust͍͍ͧʂʂʂʂʂʂʂʂʂ ϝϯλʔ͞Μɺνϡʔλʔ͞ΜɺӡӦ͞Μɺ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ