{"id":6957,"date":"2024-06-19T10:26:04","date_gmt":"2024-06-19T03:26:04","guid":{"rendered":"https:\/\/mona.host\/?p=6957"},"modified":"2024-12-13T11:45:58","modified_gmt":"2024-12-13T04:45:58","slug":"ssh-la-gi","status":"publish","type":"post","link":"https:\/\/mona.host\/ssh-la-gi\/","title":{"rendered":"SSH L\u00e0 G\u00ec? C\u00e1ch S\u1eed D\u1ee5ng SSH \u0110\u1ec3 K\u1ebft N\u1ed1i V\u1edbi Server Linux"},"content":{"rendered":"<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">Contents<\/p><ul class=\"toc_list\"><li><a href=\"#SSH_la_gi\"><span class=\"toc_number toc_depth_1\">1.<\/span> SSH l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cach_hoat_dong_cua_SSH\"><span class=\"toc_number toc_depth_1\">2.<\/span> C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a SSH<\/a><\/li><li><a href=\"#Khi_nao_nen_su_dung_SSH\"><span class=\"toc_number toc_depth_1\">3.<\/span> Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng SSH<\/a><\/li><li><a href=\"#Uu_diem_cua_SSH_la_gi\"><span class=\"toc_number toc_depth_1\">4.<\/span> \u01afu \u0111i\u1ec3m c\u1ee7a SSH l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cac_ky_thuat_ma_hoa_trong_SSH_la_gi\"><span class=\"toc_number toc_depth_1\">5.<\/span> C\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a trong SSH l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cac_giai_doan_xu_ly_ma_hoa_cua_giao_thuc_SSH\"><span class=\"toc_number toc_depth_1\">6.<\/span> C\u00e1c giai \u0111o\u1ea1n x\u1eed l\u00fd m\u00e3 h\u00f3a c\u1ee7a giao th\u1ee9c SSH<\/a><\/li><li><a href=\"#Mot_so_van_de_bao_mat_lien_quan_den_SSH\"><span class=\"toc_number toc_depth_1\">7.<\/span> M\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 b\u1ea3o m\u1eadt li\u00ean quan \u0111\u1ebfn SSH<\/a><\/li><li><a href=\"#Diem_khac_nhau_giua_giao_thuc_SSLTLS_Telnet_va_SSH_la_gi\"><span class=\"toc_number toc_depth_1\">8.<\/span> \u0110i\u1ec3m kh\u00e1c nhau gi\u1eefa giao th\u1ee9c SSL\/TLS, Telnet v\u00e0 SSH l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cach_su_dung_SSH_de_ket_noi_voi_Server_Linux\"><span class=\"toc_number toc_depth_1\">9.<\/span> C\u00e1ch s\u1eed d\u1ee5ng SSH \u0111\u1ec3 k\u1ebft n\u1ed1i v\u1edbi Server Linux<\/a><\/li><li><a href=\"#Mot_so_cau_lenh_SSH_thong_dung\"><span class=\"toc_number toc_depth_1\">10.<\/span> M\u1ed9t s\u1ed1 c\u00e2u l\u1ec7nh SSH th\u00f4ng d\u1ee5ng<\/a><\/li><li><a href=\"#Cac_cau_hoi_thuong_gap_ve_SSH_la_gi\"><span class=\"toc_number toc_depth_1\">11.<\/span> C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 SSH l\u00e0 g\u00ec?<\/a><\/li><\/ul><\/div>\n<p>SSH l\u00e0 m\u1ed9t giao th\u1ee9c m\u1ea1ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i hi\u1ec7n nay. Giao th\u1ee9c m\u1ea1ng n\u00e0y ph\u00e1t tri\u1ec3n nh\u1eb1m thay th\u1ebf c\u00e1c giao th\u1ee9c k\u1ebft n\u1ed1i kh\u00f4ng an to\u00e0n nh\u01b0 Telnet. SSH cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c m\u00e3 h\u00f3a d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd, \u0111\u1ea3m b\u1ea3o r\u1eb1ng th\u00f4ng tin truy\u1ec1n t\u1ea3i qua m\u1ea1ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 v\u00e0 kh\u00f4ng th\u1ec3 b\u1ecb \u0111\u00e1nh c\u1eafp. V\u1eady SSH l\u00e0 g\u00ec? T\u1ea1i sao n\u00ean s\u1eed d\u1ee5ng SSH cho m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n? H\u00e3y <a href=\"https:\/\/mona.host\/\" target=\"_blank\" rel=\"noopener\">MONA Host<\/a> t\u00ecm hi\u1ec3u ngay trong b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<h2><span id=\"SSH_la_gi\">SSH l\u00e0 g\u00ec?<\/span><\/h2>\n<p><strong>SSH<\/strong>, hay <strong>Secure Shell<\/strong>, l\u00e0 m\u1ed9t giao th\u1ee9c m\u1ea1ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf gi\u00fap ng\u01b0\u1eddi d\u00f9ng k\u1ebft n\u1ed1i an to\u00e0n gi\u1eefa m\u00e1y t\u00ednh v\u00e0 server. Giao th\u1ee9c n\u00e0y cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng nh\u1eadp v\u00e0 qu\u1ea3n l\u00fd web server t\u1eeb xa qua Internet m\u1ed9t c\u00e1ch an to\u00e0n. Secure Shell s\u1eed d\u1ee5ng c\u00e1c c\u01a1 ch\u1ebf <a href=\"https:\/\/mona.host\/ma-hoa-la-gi\/\" target=\"_blank\" rel=\"noopener\">m\u00e3 h\u00f3a d\u1eef li\u1ec7u<\/a> m\u1ea1nh m\u1ebd, gi\u00fap b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u tr\u00e1nh kh\u1ecfi nh\u1eefng \u0111\u0103ng nh\u1eadp tr\u00e1i ph\u00e9p v\u00e0 c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng.<\/p>\n<p>\u0110i\u1ec3m n\u1ed5i b\u1eadt c\u1ee7a SSH l\u00e0 t\u00ednh n\u0103ng x\u00e1c minh danh t\u00ednh b\u1eb1ng kh\u00f3a c\u00f4ng khai, ng\u0103n ch\u1eb7n truy c\u1eadp m\u1ea1o danh \u0111\u1ea3m b\u1ea3o ch\u1ec9 nh\u1eefng ng\u01b0\u1eddi c\u00f3 quy\u1ec1n m\u1edbi \u0111\u01b0\u1ee3c ph\u00e9p truy c\u1eadp v\u00e0o h\u1ec7 th\u00f4ng, \u0111\u1ed3ng th\u1eddi SSH thi\u1ebft l\u1eadp phi\u00ean l\u00e0m vi\u1ec7c b\u1ea3o m\u1eadt, qu\u1ea3n l\u00fd t\u1ec7p t\u1eeb xa \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 b\u1ea3o m\u1eadt.<\/p>\n<img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-45442\" src=\"http:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi.jpg\" alt=\"SSH l\u00e0 g\u00ec?\" width=\"1280\" height=\"720\" srcset=\"https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi.jpg 1280w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi-300x169.jpg 300w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi-1024x576.jpg 1024w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi-768x432.jpg 768w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi-400x225.jpg 400w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi-100x56.jpg 100w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi-600x338.jpg 600w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi-935x526.jpg 935w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/ssh-la-gi-693x390.jpg 693w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/>\n<p>B\u00ean c\u1ea1nh \u0111\u00f3, SSH c\u00f2n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i b\u1edfi QTV m\u1ea1ng \u0111\u1ec3 qu\u1ea3n l\u00fd h\u1ec7 th\u1ed1ng v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng t\u1eeb xa, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng nh\u1eadp v\u00e0o c\u00e1c m\u00e1y t\u00ednh kh\u00e1c th\u00f4ng qua internet v\u00e0 th\u1ef1c thi nh\u1eefng t\u00e1c v\u1ee5 nh\u01b0 th\u1ef1c thi l\u1ec7nh, di chuy\u1ec3n t\u1ec7p,&#8230;\u0110\u1ed3ng th\u1eddi trong SSH \u0111\u00e3 bao g\u1ed3m c\u00e1c giao th\u1ee9c m\u1ea1ng v\u00e0 b\u1ed9 ti\u1ec7n \u00edch \u0111i k\u00e8m \u0111\u1ec3 tri\u1ec3n khai c\u00e1c giao th\u1ee9c \u0111\u00f3. Ngo\u00e0i ra, SSH c\u00f2n \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 t\u1ea1o c\u00e1c tunnel b\u1ea3o m\u1eadt cho nh\u1eefng giao th\u1ee9c \u1ee9ng d\u1ee5ng ch\u1eb3ng h\u1ea1n nh\u01b0 d\u00f9ng \u0111\u1ec3 ch\u1ea1y phi\u00ean \u0111\u1ed3 h\u1ecda X Windows System.<\/p>\n<h2><span id=\"Cach_hoat_dong_cua_SSH\">C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a SSH<\/span><\/h2>\n<p>SSH ho\u1ea1t \u0111\u1ed9ng theo <a href=\"https:\/\/mona.host\/client-server-la-gi\/\" target=\"_blank\" rel=\"noopener\">m\u00f4 h\u00ecnh client &#8211; server<\/a><strong>,<\/strong> s\u1eed d\u1ee5ng nhi\u1ec1u l\u1edbp m\u00e3 h\u00f3a \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u1ee9ng th\u1ef1c an to\u00e0n gi\u1eefa hai thi\u1ebft b\u1ecb t\u1eeb xa. SSH \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf nh\u1eb1m thay th\u1ebf cho c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh gi\u1ea3 l\u1eadp terminal hay c\u00e1c giao th\u1ee9c kh\u00f4ng an to\u00e0n nh\u01b0 telnet, remote shell,&#8230;B\u00ean c\u1ea1nh \u0111\u00f3 SSH c\u0169ng thay th\u1ebf cho c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n file nh\u01b0 <a href=\"https:\/\/mona.host\/ftp-server-la-gi\/\" target=\"_blank\" rel=\"noopener\">FTP<\/a>, hay remote copy (rcp).<\/p>\n<img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-45439\" src=\"http:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh.jpg\" alt=\"C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a SSH\" width=\"1280\" height=\"720\" srcset=\"https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh.jpg 1280w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh-300x169.jpg 300w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh-1024x576.jpg 1024w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh-768x432.jpg 768w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh-400x225.jpg 400w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh-100x56.jpg 100w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh-600x338.jpg 600w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh-935x526.jpg 935w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cach-thuc-hoat-dong-ssh-693x390.jpg 693w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/>\n<p>Qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Secure Shell g\u1ed3m giai \u0111o\u1ea1n ch\u00ednh nh\u01b0:<\/p>\n<ul>\n<li><strong>K\u1ebft n\u1ed1i<\/strong>: \u0110\u1ea7u ti\u00ean, m\u00e1y kh\u00e1ch s\u1ebd g\u1eedi y\u00eau c\u1ea7u k\u1ebft n\u1ed1i b\u1eb1ng <a href=\"https:\/\/mona.host\/dia-chi-ip-la-gi\/\" target=\"_blank\" rel=\"noopener\">\u0111\u1ecba ch\u1ec9 IP<\/a>, t\u00ean m\u00e1y ch\u1ee7 ho\u1eb7c s\u1ed1 c\u1ed5ng SSH (m\u1eb7c \u0111\u1ecbnh l\u00e0 c\u1ed5ng 22). M\u00e1y ch\u1ee7 s\u1ebd l\u1eafng nghe tr\u00ean c\u1ed5ng SSH v\u00e0 ph\u1ea3n h\u1ed3i b\u1eb1ng c\u00e1ch g\u1eedi public key (kh\u00f3a c\u00f4ng khai) c\u1ee7a n\u00f3 cho m\u00e1y kh\u00e1ch.<\/li>\n<li><strong>X\u00e1c th\u1ef1c:<\/strong> M\u00e1y kh\u00e1ch s\u1ebd x\u00e1c minh public key c\u1ee7a m\u00e1y ch\u1ee7 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111ang k\u1ebft n\u1ed1i \u0111\u00fang <a href=\"https:\/\/mona.host\/server-la-gi\/\" target=\"_blank\" rel=\"noopener\">server<\/a>, th\u01b0\u1eddng th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c nh\u01b0 m\u1eadt kh\u1ea9u ho\u1eb7c kh\u00f3a ri\u00eang t\u01b0. Kh\u00f3a c\u00f4ng khai c\u1ee7a m\u00e1y ch\u1ee7 th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u01b0u trong t\u1ec7p known_hosts c\u1ee7a m\u00e1y kh\u00e1ch t\u1eeb c\u00e1c l\u1ea7n k\u1ebft n\u1ed1i tr\u01b0\u1edbc, gi\u00fap t\u1ef1 \u0111\u1ed9ng h\u00f3a qu\u00e1 tr\u00ecnh x\u00e1c minh trong t\u01b0\u01a1ng lai.<\/li>\n<li><strong>M\u00e3 h\u00f3a:<\/strong> Sau khi x\u00e1c th\u1ef1c, m\u00e1y kh\u00e1ch t\u1ea1o m\u1ed9t phi\u00ean (session) b\u00ed m\u1eadt v\u00e0 m\u00e3 h\u00f3a n\u00f3 b\u1eb1ng public key c\u1ee7a m\u00e1y ch\u1ee7, sau \u0111\u00f3 g\u1eedi l\u1ea1i cho m\u00e1y ch\u1ee7. M\u00e1y ch\u1ee7 s\u1ebd gi\u1ea3i m\u00e3 phi\u00ean n\u00e0y b\u1eb1ng private key c\u1ee7a m\u00ecnh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o b\u1ea3o m\u1eadt, tr\u00e1nh b\u1ecb \u0111\u00e1nh c\u1eafp ho\u1eb7c ch\u1ec9nh s\u1eeda d\u1eef li\u1ec7u.<\/li>\n<li><strong>Giao ti\u1ebfp:<\/strong> Sau khi k\u1ebft n\u1ed1i, m\u00e1y kh\u00e1ch c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c l\u1ec7nh, truy\u1ec1n t\u1ec7p ho\u1eb7c chuy\u1ec3n ti\u1ebfp c\u1ed5ng tr\u00ean m\u00e1y ch\u1ee7. M\u00e1y ch\u1ee7 s\u1ebd th\u1ef1c hi\u1ec7n c\u00e1c l\u1ec7nh t\u1eeb m\u00e1y kh\u00e1ch v\u00e0 tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3.<\/li>\n<li><strong>\u0110\u00f3ng k\u1ebft n\u1ed1i:<\/strong> Khi phi\u00ean SSH k\u1ebft th\u00fac, k\u00eanh m\u00e3 h\u00f3a s\u1ebd \u0111\u00f3ng l\u1ea1i, v\u00e0 k\u1ebft n\u1ed1i gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 s\u1ebd b\u1ecb h\u1ee7y ngay l\u1eadp t\u1ee9c. Qu\u00e1 tr\u00ecnh n\u00e0y th\u01b0\u1eddng r\u1ea5t nhanh v\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ul>\n<p>Khi b\u1ea1n k\u1ebft n\u1ed1i b\u1eb1ng l\u1ec7nh &#8220;ssh server.example.org&#8221;, SSH so s\u00e1nh th\u00f4ng tin \u0111\u0103ng nh\u1eadp \u0111\u1ec3 x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng. SSH c\u0169ng r\u1ea5t ti\u1ec7n l\u1ee3i cho \u0111\u0103ng nh\u1eadp SSO, gi\u00fap ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng nh\u1eadp nhanh ch\u00f3ng m\u00e0 kh\u00f4ng c\u1ea7n nh\u1eadp l\u1ea1i th\u00f4ng tin.<\/p>\n<h2><span id=\"Khi_nao_nen_su_dung_SSH\">Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng SSH<\/span><\/h2>\n<p>Giao th\u1ee9c SSH \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong l\u1edbp th\u1ee9 t\u01b0 c\u1ee7a m\u00f4 h\u00ecnh <a href=\"https:\/\/mona.host\/tcp-ip-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>TCP\/IP<\/strong><\/a> \u0111\u1ec3 cung c\u1ea5p k\u1ebft n\u1ed1i an to\u00e0n gi\u1eefa m\u00e1y ch\u1ee7 v\u00e0 m\u00e1y kh\u00e1ch. SSH s\u1eed d\u1ee5ng c\u00e1c c\u01a1 ch\u1ebf m\u00e3 h\u00f3a \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh an to\u00e0n khi <a href=\"https:\/\/mona.host\/data-transfer-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>truy\u1ec1n d\u1eef li\u1ec7u<\/strong><\/a>. Vi\u1ec7c s\u1eed d\u1ee5ng SSH \u0111\u01b0\u1ee3c khuy\u1ebfn kh\u00edch trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p sau:<\/p>\n<img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-47268\" src=\"http:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh.jpg\" alt=\"Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng SSH\" width=\"1280\" height=\"720\" srcset=\"https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh.jpg 1280w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh-300x169.jpg 300w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh-1024x576.jpg 1024w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh-768x432.jpg 768w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh-400x225.jpg 400w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh-100x56.jpg 100w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh-600x338.jpg 600w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh-935x526.jpg 935w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/khi-nao-nen-su-dung-ssh-693x390.jpg 693w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/>\n<ul>\n<li aria-level=\"1\"><strong>Truy c\u1eadp t\u1eeb xa v\u00e0o m\u00e1y t\u00ednh<\/strong>: SSH l\u00e0 l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u khi b\u1ea1n c\u1ea7n truy c\u1eadp v\u00e0 l\u00e0m vi\u1ec7c tr\u00ean m\u1ed9t m\u00e1y t\u00ednh t\u1eeb xa. N\u00f3 thi\u1ebft l\u1eadp m\u1ed9t k\u1ebft n\u1ed1i b\u1ea3o m\u1eadt, \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng khi l\u00e0m vi\u1ec7c v\u1edbi th\u00f4ng tin nh\u1ea1y c\u1ea3m nh\u01b0 th\u00f4ng tin t\u00e0i kho\u1ea3n ng\u00e2n h\u00e0ng hay \u0111\u0103ng nh\u1eadp kh\u00e1ch h\u00e0ng.<\/li>\n<li aria-level=\"1\"><strong>Qu\u1ea3n l\u00fd m\u00e1y ch\u1ee7 web<\/strong>: \u0110\u1ec3 qu\u1ea3n l\u00fd v\u00e0 c\u1eadp nh\u1eadt c\u00e1c t\u1eadp tin tr\u00ean m\u00e1y ch\u1ee7 web m\u1ed9t c\u00e1ch an to\u00e0n, SSH cung c\u1ea5p ph\u01b0\u01a1ng th\u1ee9c truy c\u1eadp an to\u00e0n v\u00e0o d\u00f2ng l\u1ec7nh c\u1ee7a m\u00e1y ch\u1ee7.<\/li>\n<li aria-level=\"1\"><strong>Truy\u1ec1n t\u1ea3i file an to\u00e0n<\/strong>: Khi c\u1ea7n truy\u1ec1n t\u1ea3i file gi\u1eefa c\u00e1c m\u00e1y t\u00ednh t\u1eeb xa, SSH cung c\u1ea5p c\u01a1 ch\u1ebf an to\u00e0n \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u tr\u00ean \u0111\u01b0\u1eddng truy\u1ec1n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u00e3 h\u00f3a.<\/li>\n<li aria-level=\"1\"><strong>T\u1ea1o tunnel b\u1ea3o m\u1eadt<\/strong>: SSH cho ph\u00e9p t\u1ea1o c\u00e1c tunnel b\u1ea3o m\u1eadt \u0111\u1ec3 truy\u1ec1n t\u1ea3i d\u1eef li\u1ec7u an to\u00e0n gi\u1eefa c\u00e1c m\u00e1y t\u00ednh t\u1eeb xa. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m nguy c\u01a1 t\u1ea5n c\u00f4ng khi s\u1eed d\u1ee5ng c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 Telnet ho\u1eb7c FTP, n\u01a1i d\u1eef li\u1ec7u kh\u00f4ng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a m\u1eb7c d\u00f9 c\u1ea7n truy\u1ec1n qua m\u1ea1ng.<\/li>\n<\/ul>\n<h2><span id=\"Uu_diem_cua_SSH_la_gi\">\u01afu \u0111i\u1ec3m c\u1ee7a SSH l\u00e0 g\u00ec?<\/span><\/h2>\n<p>SSH gi\u00fap m\u00e3 h\u00f3a d\u1eef li\u1ec7u \u0111\u1ec3 b\u1ea3o v\u1ec7 th\u00f4ng tin c\u00e1 nh\u00e2n v\u00e0 m\u1eadt kh\u1ea9u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng kh\u1ecfi b\u1ecb \u0111\u00e1nh c\u1eafp b\u1edfi c\u00e1c k\u1ebb t\u1ea5n c\u00f4ng. Ngo\u00e0i ra, SSH c\u00f2n h\u1ed7 tr\u1ee3 trong vi\u1ec7c t\u1ea1o c\u00e1c giao th\u1ee9c truy\u1ec1n d\u1eef li\u1ec7u kh\u00e1c nh\u01b0 FTP. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u1ee3i \u00edch c\u1ee5 th\u1ec3 m\u00e0 SSH mang l\u1ea1i \u0111\u1ec3 b\u1ea3o v\u1ec7 th\u00f4ng tin c\u1ee7a b\u1ea1n:<\/p>\n<img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-45444\" src=\"http:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh.jpg\" alt=\"\u01afu \u0111i\u1ec3m c\u1ee7a SSH l\u00e0 g\u00ec?\" width=\"1280\" height=\"720\" srcset=\"https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh.jpg 1280w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh-300x169.jpg 300w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh-1024x576.jpg 1024w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh-768x432.jpg 768w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh-400x225.jpg 400w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh-100x56.jpg 100w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh-600x338.jpg 600w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh-935x526.jpg 935w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/uu-diem-khi-su-dung-ssh-693x390.jpg 693w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/>\n<ul>\n<li aria-level=\"1\">\u0110\u1ea3m b\u1ea3o an to\u00e0n khi m\u00e3 h\u00f3a v\u00e0 truy\u1ec1n t\u1ea3i d\u1eef li\u1ec7u gi\u1eefa qu\u1ea3n tr\u1ecb vi\u00ean v\u00e0 kh\u00e1ch h\u00e0ng.<\/li>\n<li aria-level=\"1\">Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p m\u00e3 h\u00f3a nh\u01b0 <em>symmetrical encryption, Asymmetric encryption, hashing<\/em> \u0111\u1ec3 b\u1ea3o v\u1ec7 th\u00f4ng tin.<\/li>\n<li aria-level=\"1\">SSH cung c\u1ea5p m\u1ee9c \u0111\u1ed9 b\u1ea3o m\u1eadt cao \u0111\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb k\u1ebft n\u1ed1i t\u1eeb xa.<\/li>\n<li aria-level=\"1\">D\u1eef li\u1ec7u trao \u0111\u1ed5i gi\u1eefa kh\u00e1ch h\u00e0ng v\u00e0 server \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a, ng\u0103n ch\u1eb7n c\u00e1c truy c\u1eadp tr\u00e1i ph\u00e9p.<\/li>\n<li aria-level=\"1\">SSH \u0111\u00e3 ch\u1ee9ng minh \u0111\u01b0\u1ee3c t\u00ednh hi\u1ec7u qu\u1ea3 trong c\u00e1c gi\u1ea3i ph\u00e1p b\u1ea3o m\u1eadt v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c s\u1ef1 tin t\u01b0\u1edfng t\u1eeb ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ul>\n<h2><span id=\"Cac_ky_thuat_ma_hoa_trong_SSH_la_gi\">C\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a trong SSH l\u00e0 g\u00ec?<\/span><\/h2>\n<p>Secure Shell (SSH) c\u00f3 m\u1ed9t \u01b0u \u0111i\u1ec3m n\u1ed5i b\u1eadt l\u00e0 kh\u1ea3 n\u0103ng m\u00e3 h\u00f3a d\u1eef li\u1ec7u gi\u00fap truy\u1ec1n t\u1ea3i th\u00f4ng tin an to\u00e0n gi\u1eefa m\u00e1y ch\u1ee7 v\u00e0 m\u00e1y kh\u00e1ch th\u00f4ng. D\u01b0\u1edbi \u0111\u00e2y m\u1ed9t s\u1ed1 k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a \u0111\u01b0\u1ee3c d\u00f9ng trong SSH.<\/p>\n<img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-47269\" src=\"http:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi.jpg\" alt=\"C\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a trong SSH l\u00e0 g\u00ec?\" width=\"1280\" height=\"720\" srcset=\"https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi.jpg 1280w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi-300x169.jpg 300w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi-1024x576.jpg 1024w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi-768x432.jpg 768w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi-400x225.jpg 400w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi-100x56.jpg 100w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi-600x338.jpg 600w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi-935x526.jpg 935w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cac-ky-thuat-ma-hoa-trong-ssh-la-gi-693x390.jpg 693w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/>\n<h3>K\u1ef9 thu\u1eadt Symmetric Encryption<\/h3>\n<p>Trong Secure Shell, k\u1ef9 thu\u1eadt Symmetric Encryption l\u00e0 ph\u01b0\u01a1ng ph\u00e1p <strong>m\u00e3 h\u00f3a hai chi\u1ec1u<\/strong> b\u1eb1ng kh\u00f3a b\u00ed m\u1eadt \u0111\u01b0\u1ee3c chia s\u1ebb gi\u1eefa Host v\u00e0 Client. Ph\u01b0\u01a1ng th\u1ee9c k\u1ef9 thu\u1eadt n\u00e0y cho ph\u00e9p c\u1ea3 hai b\u00ean m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 th\u00f4ng tin giao ti\u1ebfp m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<p>M\u1ed7i phi\u00ean Secure Shell s\u1eed d\u1ee5ng m\u1ed9t Secret Token c\u00f3 h\u1ea1n th\u1eddi gian. N\u1ebfu phi\u00ean n\u00e0y k\u1ebft th\u00fac m\u00e0 Client ho\u1eb7c Host v\u1eabn ch\u01b0a nh\u1eadn \u0111\u01b0\u1ee3c v\u00e0 gi\u1ea3i m\u00e3 tin nh\u1eafn, ng\u01b0\u1eddi d\u00f9ng c\u1ea7n t\u1ea1o m\u1ed9t Key m\u1edbi \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt c\u1ee7a qu\u00e1 tr\u00ecnh giao ti\u1ebfp. Vi\u1ec7c n\u00e0y gi\u00fap ng\u0103n ch\u1eb7n vi\u1ec7c s\u1eed d\u1ee5ng Key c\u0169 m\u1ed9t c\u00e1ch kh\u00f4ng an to\u00e0n trong c\u00e1c phi\u00ean sau.<\/p>\n<h3>K\u1ef9 thu\u1eadt Asymmetric Encryption<\/h3>\n<p>SSH Asymmetric Encryption l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p m\u00e3 h\u00f3a \u0111\u01b0\u1ee3c<strong> s\u1eed d\u1ee5ng trong giao th\u1ee9c SSH<\/strong> \u0111\u1ec3 b\u1ea3o v\u1ec7 vi\u1ec7c \u0111\u0103ng nh\u1eadp v\u00e0 x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y s\u1eed d\u1ee5ng hai lo\u1ea1i kh\u00f3a: <strong>kh\u00f3a c\u00f4ng khai (public key) v\u00e0 kh\u00f3a b\u00ed m\u1eadt (private key).<\/strong><\/p>\n<p>Kh\u00f3a c\u00f4ng khai \u0111\u01b0\u1ee3c chia s\u1ebb v\u1edbi c\u00e1c m\u00e1y ch\u1ee7 t\u1eeb xa nh\u1eb1m \u0111\u1ea3m b\u1ea3o t\u00ednh x\u00e1c th\u1ef1c v\u00e0 b\u1ea3o m\u1eadt khi \u0111\u0103ng nh\u1eadp. Khi m\u1ed9t m\u00e1y kh\u00e1ch SSH mu\u1ed1n k\u1ebft n\u1ed1i, n\u00f3 s\u1ebd y\u00eau c\u1ea7u m\u00e1y ch\u1ee7 cung c\u1ea5p kh\u00f3a c\u00f4ng khai. M\u00e1y kh\u00e1ch sau \u0111\u00f3 s\u1ebd d\u00f9ng kh\u00f3a n\u00e0y \u0111\u1ec3 m\u00e3 h\u00f3a th\u00f4ng tin \u0111\u0103ng nh\u1eadp tr\u01b0\u1edbc khi g\u1eedi \u0111i.<\/p>\n<p>M\u00e1y ch\u1ee7 t\u1eeb xa s\u1ebd s\u1eed d\u1ee5ng kh\u00f3a b\u00ed m\u1eadt c\u1ee7a m\u00ecnh \u0111\u1ec3 gi\u1ea3i m\u00e3 th\u00f4ng tin v\u00e0 x\u00e1c th\u1ef1c m\u00e1y kh\u00e1ch. N\u1ebfu th\u00f4ng tin \u0111\u0103ng nh\u1eadp \u0111\u00fang, m\u00e1y kh\u00e1ch s\u1ebd \u0111\u01b0\u1ee3c truy c\u1eadp v\u00e0o h\u1ec7 th\u1ed1ng. SSH Asymmetric Encryption gi\u00fap ng\u0103n ch\u1eb7n c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng nh\u01b0 m\u1ea1o danh ng\u01b0\u1eddi d\u00f9ng, \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u00e0 b\u1ea3o m\u1eadt cho k\u1ebft n\u1ed1i m\u1ea1ng gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb t\u1eeb xa.<\/p>\n<h3>K\u1ef9 thu\u1eadt Hashing<\/h3>\n<p>Hashing l\u00e0 ph\u01b0\u01a1ng ph\u00e1p m\u00e3 h\u00f3a ph\u1ed5 bi\u1ebfn, ph\u01b0\u01a1ng th\u1ee9c n\u00e0y s\u1ebd <strong>t\u1ea1o ra m\u1ed9t m\u00e3 hash<\/strong> t\u1eeb m\u1ed9t \u0111\u1ea7u v\u00e0o duy nh\u1ea5t m\u00e0 kh\u00f4ng th\u1ec3 d\u1ec5 d\u00e0ng \u0111\u1ea3o ng\u01b0\u1ee3c \u0111\u1ec3 t\u00ecm l\u1ea1i \u0111\u1ea7u v\u00e0o ban \u0111\u1ea7u. Qu\u00e1 tr\u00ecnh n\u00e0y gi\u00fap cho Client c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t m\u00e3 b\u0103m t\u1eeb th\u00f4ng \u0111i\u1ec7p c\u1ee7a m\u00ecnh, v\u00e0 m\u00e3 b\u0103m n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c th\u1ef1c th\u00f4ng \u0111i\u1ec7p, \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 nguy\u00ean b\u1ea3n c\u1ee7a d\u1eef li\u1ec7u \u0111\u00e3 truy\u1ec1n.<\/p>\n<h2><span id=\"Cac_giai_doan_xu_ly_ma_hoa_cua_giao_thuc_SSH\">C\u00e1c giai \u0111o\u1ea1n x\u1eed l\u00fd m\u00e3 h\u00f3a c\u1ee7a giao th\u1ee9c SSH<\/span><\/h2>\n<p>Qu\u00e1 tr\u00ecnh x\u1eed l\u00fd m\u00e3 h\u00f3a bao g\u1ed3m hai giai \u0111o\u1ea1n ch\u00ednh. \u0110\u1ea7u ti\u00ean, c\u1ea3 hai b\u00ean ph\u1ea3i \u0111\u1ed3ng \u00fd s\u1eed d\u1ee5ng m\u1ed9t chu\u1ea9n m\u00e3 h\u00f3a nh\u1ea5t \u0111\u1ecbnh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt c\u1ee7a giao ti\u1ebfp. Sau \u0111\u00f3, ng\u01b0\u1eddi d\u00f9ng ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c. N\u1ebfu th\u00f4ng tin \u0111\u0103ng nh\u1eadp h\u1ee3p l\u1ec7, ng\u01b0\u1eddi d\u00f9ng s\u1ebd \u0111\u01b0\u1ee3c c\u1ea5p quy\u1ec1n truy c\u1eadp.<\/p>\n<img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-45441\" src=\"http:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh.jpg\" alt=\"C\u00e1c giai \u0111o\u1ea1n x\u1eed l\u00fd m\u00e3 h\u00f3a c\u1ee7a giao th\u1ee9c SSH\" width=\"1280\" height=\"720\" srcset=\"https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh.jpg 1280w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh-300x169.jpg 300w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh-1024x576.jpg 1024w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh-768x432.jpg 768w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh-400x225.jpg 400w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh-100x56.jpg 100w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh-600x338.jpg 600w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh-935x526.jpg 935w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/giai-doan-xu-ly-ma-hoa-ssh-693x390.jpg 693w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/>\n<h3>Giai \u0111o\u1ea1n Session Encryption Negotiation<\/h3>\n<p>Khi client c\u1ed1 g\u1eafng k\u1ebft n\u1ed1i \u0111\u1ebfn server qua TCP, server s\u1ebd \u0111\u01b0a ra giao th\u1ee9c m\u00e3 h\u00f3a v\u00e0 c\u00e1c phi\u00ean b\u1ea3n m\u00e0 n\u00f3 h\u1ed7 tr\u1ee3. N\u1ebfu client c\u0169ng h\u1ed7 tr\u1ee3 giao th\u1ee9c v\u00e0 phi\u00ean b\u1ea3n t\u01b0\u01a1ng \u1ee9ng, th\u1ecfa thu\u1eadn s\u1ebd \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp v\u00e0 qu\u00e1 tr\u00ecnh k\u1ebft n\u1ed1i s\u1ebd b\u1eaft \u0111\u1ea7u s\u1eed d\u1ee5ng giao th\u1ee9c \u0111\u00f3. Server c\u0169ng cung c\u1ea5p m\u1ed9t kh\u00f3a c\u00f4ng khai \u0111\u1ed1i x\u1ee9ng m\u00e0 client s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c minh t\u00ednh h\u1ee3p l\u1ec7 c\u1ee7a server.<\/p>\n<p>Sau khi th\u1ecfa thu\u1eadn \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp, c\u1ea3 client v\u00e0 server s\u1eed d\u1ee5ng thu\u1eadt to\u00e1n g\u1ecdi l\u00e0 Diffie-Hellman Key Exchange \u0111\u1ec3 t\u1ea1o ra m\u1ed9t kh\u00f3a \u0111\u1ed1i x\u1ee9ng. Thu\u1eadt to\u00e1n n\u00e0y cho ph\u00e9p c\u1ea3 hai b\u00ean c\u00f3 c\u00f9ng m\u1ed9t kh\u00f3a chia s\u1ebb \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00e3 h\u00f3a to\u00e0n b\u1ed9 th\u00f4ng tin giao ti\u1ebfp sau n\u00e0y.<\/p>\n<h3>Giai \u0111o\u1ea1n ch\u1ee9ng th\u1ef1c ng\u01b0\u1eddi d\u00f9ng<\/h3>\n<p>B\u01b0\u1edbc cu\u1ed1i c\u00f9ng l\u00e0 khi ng\u01b0\u1eddi d\u00f9ng nh\u1eadn \u0111\u01b0\u1ee3c quy\u1ec1n truy c\u1eadp v\u00e0o m\u00e1y ch\u1ee7 sau khi x\u00e1c th\u1ef1c th\u00f4ng tin \u0111\u0103ng nh\u1eadp. H\u1ecd s\u1ebd \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u nh\u1eadp t\u00ean ng\u01b0\u1eddi d\u00f9ng tr\u01b0\u1edbc, sau \u0111\u00f3 l\u00e0 m\u1eadt kh\u1ea9u. C\u00e1c th\u00f4ng tin n\u00e0y sau \u0111\u00f3 \u0111\u01b0\u1ee3c truy\u1ec1n an to\u00e0n qua m\u1ed9t k\u00eanh b\u1ea3o m\u1eadt \u0111\u1ed1i x\u1ee9ng, \u0111\u1ea3m b\u1ea3o r\u1eb1ng kh\u00f4ng c\u00f3 b\u00ean th\u1ee9 ba n\u00e0o c\u00f3 th\u1ec3 gi\u00e0nh \u0111\u01b0\u1ee3c ch\u00fang.<\/p>\n<p>M\u1eb7c d\u00f9 m\u1eadt kh\u1ea9u \u0111\u00e3 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a, vi\u1ec7c s\u1eed d\u1ee5ng m\u1eadt kh\u1ea9u kh\u00f4ng \u0111\u01b0\u1ee3c khuy\u1ebfn kh\u00edch \u0111\u1ec3 thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i. Nguy\u00ean nh\u00e2n ch\u00ednh l\u00e0 v\u00ec c\u00e1c k\u1ef9 thu\u1eadt t\u1ea5n c\u00f4ng nh\u01b0 <a href=\"https:\/\/mona.host\/tan-cong-brute-force-la-gi\/\" target=\"_blank\" rel=\"noopener\">brute force<\/a> c\u00f3 th\u1ec3 d\u00f2 ra m\u1eadt kh\u1ea9u m\u1eb7c \u0111\u1ecbnh ho\u1eb7c d\u1ec5 \u0111o\u00e1n, t\u1eeb \u0111\u00f3 d\u1eabn \u0111\u1ebfn nguy c\u01a1 m\u1ea5t quy\u1ec1n ki\u1ec3m so\u00e1t t\u00e0i kho\u1ea3n. C\u00e1c chuy\u00ean gia b\u1ea3o m\u1eadt khuy\u1ebfn ngh\u1ecb ng\u01b0\u1eddi d\u00f9ng n\u00ean s\u1eed d\u1ee5ng SSH Key Pair.<\/p>\n<h2><span id=\"Mot_so_van_de_bao_mat_lien_quan_den_SSH\">M\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 b\u1ea3o m\u1eadt li\u00ean quan \u0111\u1ebfn SSH<\/span><\/h2>\n<p>C\u00e1c kh\u00f3a SSH l\u01b0u tr\u1eef tr\u00ean h\u1ec7 th\u1ed1ng client c\u00f3 th\u1ec3 t\u0103ng l\u00ean theo th\u1eddi gian, n\u00ean vi\u1ec7c qu\u1ea3n l\u00fd host key hi\u1ec7u qu\u1ea3, nh\u1ea5t l\u00e0 v\u1edbi nh\u00e2n vi\u00ean IT, l\u00e0 r\u1ea5t quan tr\u1ecdng. File known_hosts c\u1ee7a SSH ch\u1ee9a th\u00f4ng tin c\u00f3 th\u1ec3 gi\u00fap k\u1ebb t\u1ea5n c\u00f4ng truy c\u1eadp v\u00e0o h\u1ec7 th\u1ed1ng t\u1eeb xa \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c.<\/p>\n<p>V\u00ec th\u1ebf, doanh nghi\u1ec7p c\u1ea7n x\u00e2y d\u1ef1ng quy tr\u00ecnh chu\u1ea9n \u0111\u1ec3 ki\u1ec3m so\u00e1t c\u00e1c file n\u00e0y. C\u00e1c l\u1eadp tr\u00ecnh vi\u00ean c\u0169ng ph\u1ea3i c\u1ea9n tr\u1ecdng khi s\u1eed d\u1ee5ng c\u00e1c l\u1ec7nh SSH trong script, v\u00ec vi\u1ec7c ch\u00e8n user ID v\u00e0 password c\u00f3 th\u1ec3 g\u00e2y r\u00f2 r\u1ec9 th\u00f4ng tin. M\u1ed9t l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt nh\u01b0 Shellshock trong Bash c\u00f3 th\u1ec3 khai th\u00e1c qua SSH, nh\u01b0ng \u0111\u00e2y l\u00e0 v\u1ea5n \u0111\u1ec1 c\u1ee7a Bash, kh\u00f4ng ph\u1ea3i SSH.<\/p>\n<h2><span id=\"Diem_khac_nhau_giua_giao_thuc_SSLTLS_Telnet_va_SSH_la_gi\">\u0110i\u1ec3m kh\u00e1c nhau gi\u1eefa giao th\u1ee9c SSL\/<a href=\"https:\/\/mona.host\/tls-la-gi\/\" target=\"_blank\" rel=\"noopener\">TLS<\/a>, Telnet v\u00e0 SSH l\u00e0 g\u00ec?<\/span><\/h2>\n<p>Telnet l\u00e0 m\u1ed9t trong nh\u1eefng giao th\u1ee9c Internet \u0111\u1ea7u ti\u00ean trong khi <a href=\"https:\/\/mona.host\/ssl-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>giao th\u1ee9c SSL<\/strong><\/a>\/TLS c\u00f3 th\u1ec3 xem nh\u01b0 phi\u00ean b\u1ea3n \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a Secure Shell. C\u1ea3 ba \u0111\u1ec1u c\u00f3 nh\u1eefng \u0111i\u1ec3m t\u01b0\u01a1ng \u0111\u1ed3ng v\u1ec1 t\u00ednh n\u0103ng, tuy nhi\u00ean c\u1ea3 ba giao th\u1ee9c v\u1eabn c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t, c\u00f9ng t\u00ecm hi\u1ec3u b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y nh\u00e9.<\/p>\n<table style=\"width: 100%; height: 209px;\">\n<tbody>\n<tr style=\"height: 23px;\">\n<td style=\"width: 27.6049%; text-align: center; height: 23px;\"><strong>Ti\u00eau ch\u00ed so s\u00e1nh<\/strong><\/td>\n<td style=\"width: 25.8457%; text-align: center; height: 23px;\"><strong>SSH<\/strong><\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\"><strong>SSL\/TLS<\/strong><\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\"><strong>Telnet<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 27.6049%; text-align: center; height: 23px;\"><strong>V\u1ecb tr\u00ed Port ch\u1ea1y<\/strong><\/td>\n<td style=\"width: 25.8457%; text-align: center; height: 23px;\">Port 22<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">Port 22<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">Port 23<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 27.6049%; text-align: center; height: 23px;\"><strong>T\u00ednh an to\u00e0n<\/strong><\/td>\n<td style=\"width: 25.8457%; text-align: center; height: 23px;\">R\u1ea5t an to\u00e0n<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">K\u00e9m an to\u00e0n<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">K\u00e9m an to\u00e0n<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 27.6049%; text-align: center; height: 23px;\"><strong>C\u01a1 ch\u1ebf m\u00e3 h\u00f3a<\/strong><\/td>\n<td style=\"width: 25.8457%; text-align: center; height: 23px;\">Public Key<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">Public Key<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">Truy\u1ec1n v\u0103n b\u1ea3n \u0111\u01a1n thu\u1ea7n<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 27.6049%; text-align: center; height: 23px;\"><strong>H\u1ec7 th\u1ed1ng ph\u00f9 h\u1ee3p<\/strong><\/td>\n<td style=\"width: 25.8457%; text-align: center; height: 23px;\">Public Network<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">Public Network<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">Private Network<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 27.6049%; text-align: center; height: 23px;\"><strong>H\u1ec7 \u0111i\u1ec1u h\u00e0nh t\u01b0\u01a1ng th\u00edch<\/strong><\/td>\n<td style=\"width: 25.8457%; text-align: center; height: 23px;\">T\u1ea5t c\u1ea3 h\u1ec7 \u0111i\u1ec1u h\u00e0nh<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">T\u1ea5t c\u1ea3 h\u1ec7 \u0111i\u1ec1u h\u00e0nh<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 23px;\">Linux v\u00e0 Windows<\/td>\n<\/tr>\n<tr style=\"height: 71px;\">\n<td style=\"width: 27.6049%; text-align: center; height: 71px;\"><strong>Ch\u1ee9c n\u0103ng<\/strong><\/td>\n<td style=\"width: 25.8457%; text-align: center; height: 71px;\">\u0110i\u1ec1u khi\u1ec3n m\u00e1y ch\u1ee7 t\u1eeb xa, k\u1ebft n\u1ed1i gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y tr\u1ea1m<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 71px;\">Ki\u1ec3m so\u00e1t, \u0111i\u1ec1u khi\u1ec3n Server t\u1eeb xa<\/td>\n<td style=\"width: 22.4628%; text-align: center; height: 71px;\">Ki\u1ec3m so\u00e1t, \u0111i\u1ec1u khi\u1ec3n Server t\u1eeb xa<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span id=\"Cach_su_dung_SSH_de_ket_noi_voi_Server_Linux\">C\u00e1ch s\u1eed d\u1ee5ng SSH \u0111\u1ec3 k\u1ebft n\u1ed1i v\u1edbi Server Linux<\/span><\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u r\u00f5 v\u1ec1 SSH l\u00e0 g\u00ec kh\u00f4ng \u0111\u01a1n gi\u1ea3n ch\u1ec9 d\u1eebng l\u1ea1i \u1edf kh\u00e1i ni\u1ec7m. \u0110i\u1ec1u quan tr\u1ecdng h\u01a1n l\u00e0 bi\u1ebft c\u00e1ch \u00e1p d\u1ee5ng n\u00f3 v\u00e0o th\u1ef1c t\u1ebf. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 h\u01b0\u1edbng d\u1eabn c\u00e0i \u0111\u1eb7t v\u00e0 k\u1ebft n\u1ed1i SSH cho server Linux, nh\u1eb1m gi\u00fap b\u1ea1n th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c qu\u1ea3n tr\u1ecb h\u1ec7 th\u1ed1ng m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-45440\" src=\"http:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux.jpg\" alt=\"C\u00e1ch s\u1eed d\u1ee5ng SSH \u0111\u1ec3 k\u1ebft n\u1ed1i v\u1edbi Server Linux\" width=\"1280\" height=\"720\" srcset=\"https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux.jpg 1280w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux-300x169.jpg 300w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux-1024x576.jpg 1024w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux-768x432.jpg 768w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux-400x225.jpg 400w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux-100x56.jpg 100w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux-600x338.jpg 600w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux-935x526.jpg 935w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/cai-dat-ssh-len-server-linux-693x390.jpg 693w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/>\n<h3>Thi\u1ebft l\u1eadp Server Linux ch\u1ea5p nh\u1eadn li\u00ean k\u1ebft<\/h3>\n<p>\u0110\u1ec3 thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i SSH cho m\u00e1y ch\u1ee7 Linux, tr\u01b0\u1edbc h\u1ebft b\u1ea1n c\u1ea7n th\u1ef1c hi\u1ec7n m\u1ed9t s\u1ed1 b\u01b0\u1edbc c\u1ea5u h\u00ecnh c\u01a1 b\u1ea3n. T\u00f9y thu\u1ed9c v\u00e0o ph\u1ea7n c\u1ee9ng v\u00e0 phi\u00ean b\u1ea3n Linux, b\u1ea1n c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh c\u00e0i \u0111\u1eb7t cho ph\u00f9 h\u1ee3p. Sau khi t\u1ea3i c\u00f4ng c\u1ee5 v\u1ec1, b\u1ea1n m\u1edf Terminal b\u1eb1ng c\u00e1ch nh\u1ea5n t\u1ed5 h\u1ee3p ph\u00edm <strong>Ctrl + Alt + T<\/strong> v\u00e0 nh\u1eadp l\u1ec7nh \u201c<strong>sudo apt-get update<\/strong>\u201d.<\/p>\n<p>Tr\u01b0\u1edbc khi c\u00e0i \u0111\u1eb7t OpenSSH, h\u00e3y ki\u1ec3m tra v\u00e0 c\u1eadp nh\u1eadt c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh hi\u1ec7n c\u00f3 b\u1eb1ng l\u1ec7nh \u201c<strong>sudo apt-get upgrade<\/strong>\u201d trong Terminal. Khi qu\u00e1 tr\u00ecnh c\u1eadp nh\u1eadt ho\u00e0n t\u1ea5t, b\u1ea1n ti\u1ebfp t\u1ee5c nh\u1eadp l\u1ec7nh \u201c<strong>sudo apt-get install openssh-server<\/strong>\u201d \u0111\u1ec3 c\u00e0i \u0111\u1eb7t OpenSSH.<\/p>\n<h3>Thi\u1ebft l\u1eadp c\u00e0i \u0111\u1eb7t SSH cho Server<\/h3>\n<p>Sau khi ho\u00e0n t\u1ea5t vi\u1ec7c thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i, b\u01b0\u1edbc ti\u1ebfp theo l\u00e0 ch\u1ec9nh s\u1eeda c\u1ea5u h\u00ecnh c\u01a1 b\u1ea3n. \u0110\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y, b\u1ea1n m\u1edf Terminal, truy c\u1eadp file c\u1ea5u h\u00ecnh SSH b\u1eb1ng l\u1ec7nh \u201c<strong>sudo nano \/etc\/ssh\/sshd_config<\/strong>\u201d. Theo m\u1eb7c \u0111\u1ecbnh, SSH Server ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u1ed5ng 22. \u0110\u1ec3 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt, b\u1ea1n n\u00ean \u0111\u1eb7t m\u1eadt kh\u1ea9u ph\u1ee9c t\u1ea1p.<\/p>\n<p>Trong ph\u1ea7n Port, t\u00ecm d\u00f2ng MaxAuthTries v\u00e0 nh\u1eadp gi\u00e1 tr\u1ecb b\u1ea1n mu\u1ed1n. V\u00ed d\u1ee5, n\u1ebfu mu\u1ed1n gi\u1edbi h\u1ea1n s\u1ed1 l\u1ea7n \u0111\u0103ng nh\u1eadp t\u1ed1i \u0111a l\u00e0 4, b\u1ea1n ch\u1ec9 c\u1ea7n nh\u1eadp \u201c<strong>MaxAuthTries 4<\/strong>\u201d. Khi \u0111\u00e3 c\u00e0i \u0111\u1eb7t xong OpenSSH, SSH Server s\u1ebd b\u1eaft \u0111\u1ea7u ch\u1ea1y.<\/p>\n<p>\u0110\u1ec3 ki\u1ec3m tra tr\u1ea1ng th\u00e1i c\u1ee7a SSH Server, b\u1ea1n s\u1eed d\u1ee5ng l\u1ec7nh \u201c<strong>sudo service ssh status<\/strong>\u201d. N\u1ebfu kh\u00f4ng mu\u1ed1n ch\u1ea1y SSH, b\u1ea1n c\u00f3 th\u1ec3 d\u1eebng n\u00f3 b\u1eb1ng l\u1ec7nh \u201c<strong>sudo service ssh stop<\/strong>\u201d.<\/p>\n<h2><span id=\"Mot_so_cau_lenh_SSH_thong_dung\">M\u1ed9t s\u1ed1 c\u00e2u l\u1ec7nh SSH th\u00f4ng d\u1ee5ng<\/span><\/h2>\n<p>Sau khi \u0111\u00e3 t\u00ecm hi\u1ec3u SSH l\u00e0 g\u00ec v\u00e0 c\u00e1ch giao th\u1ee9c n\u00e0y ho\u1ea1t \u0111\u1ed9ng, vi\u1ec7c bi\u1ebft m\u1ed9t s\u1ed1 c\u00e2u l\u1ec7nh SSH c\u01a1 b\u1ea3n s\u1ebd gi\u00fap b\u1ea1n thu\u1eadn ti\u1ec7n h\u01a1n trong qu\u00e1 tr\u00ecnh l\u00e0m quen v\u1edbi giao th\u1ee9c n\u00e0y. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u1ec7nh SSH ph\u1ed5 bi\u1ebfn m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng khi l\u00e0m vi\u1ec7c:<\/p>\n<img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-47270\" src=\"http:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung.jpg\" alt=\"M\u1ed9t s\u1ed1 c\u00e2u l\u1ec7nh SSH th\u00f4ng d\u1ee5ng\" width=\"1280\" height=\"720\" srcset=\"https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung.jpg 1280w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung-300x169.jpg 300w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung-1024x576.jpg 1024w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung-768x432.jpg 768w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung-400x225.jpg 400w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung-100x56.jpg 100w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung-600x338.jpg 600w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung-935x526.jpg 935w, https:\/\/mona.host\/wp-content\/uploads\/2024\/06\/mot-so-cau-lenh-ssh-thong-dung-693x390.jpg 693w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/>\n<ul>\n<li aria-level=\"1\"><strong>ls:<\/strong> L\u1ea5y danh s\u00e1ch c\u00e1c file v\u00e0 th\u01b0 m\u1ee5c trong th\u01b0 m\u1ee5c hi\u1ec7n t\u1ea1i.<\/li>\n<li aria-level=\"1\"><strong>cd:<\/strong> Di chuy\u1ec3n \u0111\u1ebfn m\u1ed9t th\u01b0 m\u1ee5c m\u1edbi.<\/li>\n<li aria-level=\"1\"><strong>mkdir:<\/strong> T\u1ea1o m\u1ed9t th\u01b0 m\u1ee5c m\u1edbi.<\/li>\n<li aria-level=\"1\"><strong>touch:<\/strong> T\u1ea1o m\u1ed9t t\u1eadp tin m\u1edbi.<\/li>\n<li aria-level=\"1\"><strong>rm:<\/strong> X\u00f3a t\u1eadp tin ho\u1eb7c th\u01b0 m\u1ee5c.<\/li>\n<li aria-level=\"1\"><strong>cat:<\/strong> Xem n\u1ed9i dung c\u1ee7a m\u1ed9t t\u1eadp tin.<\/li>\n<li aria-level=\"1\"><strong>pwd:<\/strong> Hi\u1ec3n th\u1ecb \u0111\u01b0\u1eddng d\u1eabn c\u1ee7a th\u01b0 m\u1ee5c hi\u1ec7n t\u1ea1i.<\/li>\n<li aria-level=\"1\"><strong>cp:<\/strong> Sao ch\u00e9p t\u1eadp tin ho\u1eb7c th\u01b0 m\u1ee5c \u0111\u1ebfn m\u1ed9t v\u1ecb tr\u00ed m\u1edbi.<\/li>\n<li aria-level=\"1\"><strong>mv:<\/strong> Di chuy\u1ec3n ho\u1eb7c \u0111\u1ed5i t\u00ean t\u1eadp tin v\u00e0 th\u01b0 m\u1ee5c.<\/li>\n<li aria-level=\"1\"><strong>find:<\/strong> T\u00ecm ki\u1ebfm t\u1eadp tin ho\u1eb7c th\u01b0 m\u1ee5c theo c\u00e1c ti\u00eau ch\u00ed nh\u01b0 t\u00ean, k\u00edch th\u01b0\u1edbc, v\u00e0 lo\u1ea1i t\u1ec7p.<\/li>\n<\/ul>\n<h2><span id=\"Cac_cau_hoi_thuong_gap_ve_SSH_la_gi\">C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 SSH l\u00e0 g\u00ec?<\/span><\/h2>\n<p>B\u00ean c\u1ea1nh nh\u1eefng th\u1eafc m\u1eafc li\u00ean quan \u0111\u1ebfn c\u00e1c v\u1ea5n xoay quanh SSH l\u00e0 g\u00ec, ng\u01b0\u1eddi d\u00f9ng c\u00f2n c\u00f3 m\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi ph\u1ed5 bi\u1ebfn v\u1ec1 giao th\u1ee9c n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c gi\u1ea3i \u0111\u00e1p.<\/p>\n<h3>SSH Key l\u00e0 g\u00ec?<\/h3>\n<p>SSH Key l\u00e0 m\u1ed9t c\u1eb7p m\u00e3 h\u00f3a bao g\u1ed3m <strong>kh\u00f3a ri\u00eang t\u01b0 v\u00e0 kh\u00f3a c\u00f4ng khai<\/strong>, \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong giao th\u1ee9c SSH (Secure Shell). Kh\u00f3a ri\u00eang t\u01b0 \u0111\u01b0\u1ee3c gi\u1eef b\u00ed m\u1eadt v\u00e0 d\u00f9ng \u0111\u1ec3 gi\u1ea3i m\u00e3 c\u00e1c th\u00f4ng tin \u0111\u01b0\u1ee3c g\u1eedi t\u1eeb kh\u00f3a c\u00f4ng khai, trong khi kh\u00f3a c\u00f4ng khai \u0111\u01b0\u1ee3c chia s\u1ebb c\u00f4ng khai v\u00e0 d\u00f9ng \u0111\u1ec3 m\u00e3 h\u00f3a d\u1eef li\u1ec7u tr\u01b0\u1edbc khi g\u1eedi \u0111i.<\/p>\n<h3>OpenSSH l\u00e0 g\u00ec?<\/h3>\n<p>OpenSSH l\u00e0 m\u1ed9t b\u1ed9 c<strong>\u00f4ng c\u1ee5 m\u00e3 ngu\u1ed3n m\u1edf<\/strong> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 cung c\u1ea5p c\u00e1c ti\u1ec7n \u00edch m\u1ea1ng li\u00ean quan \u0111\u1ebfn b\u1ea3o m\u1eadt m\u00e1y t\u00ednh, ch\u1ee7 y\u1ebfu d\u1ef1a tr\u00ean giao th\u1ee9c SSH (Secure Shell). N\u00f3 gi\u00fap b\u1ea3o v\u1ec7 th\u00f4ng tin li\u00ean l\u1ea1c m\u1ea1ng b\u1eb1ng c\u00e1ch m\u00e3 h\u00f3a giao th\u00f4ng m\u1ea1ng th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c m\u00e3 h\u00f3a \u0111a d\u1ea1ng v\u00e0 cung c\u1ea5p c\u00e1c t\u00ednh n\u0103ng \u0111\u01b0\u1eddng h\u1ea7m an to\u00e0n.<\/p>\n<h3>C\u00e1c ph\u01b0\u01a1ng ph\u00e1p m\u00e3 h\u00f3a c\u1ee7a SSH c\u00f3 an to\u00e0n hay kh\u00f4ng?<\/h3>\n<p>Nh\u00ecn chung, ph\u01b0\u01a1ng ph\u00e1p m\u00e3 h\u00f3a trong SSH \u0111\u01b0\u1ee3c coi l\u00e0 r\u1ea5t an to\u00e0n v\u00e0 kh\u00f3 b\u1ecb t\u1ea5n c\u00f4ng. Tuy nhi\u00ean, kh\u00f4ng c\u00f3 h\u1ec7 th\u1ed1ng b\u1ea3o m\u1eadt n\u00e0o l\u00e0 kh\u00f4ng th\u1ec3 b\u1ecb x\u00e2m nh\u1eadp ho\u00e0n to\u00e0n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 r\u1ee7i ro ti\u1ec1m \u1ea9n li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng m\u00e3 h\u00f3a trong SSH:<\/p>\n<ul>\n<li aria-level=\"1\">L\u1ed7 h\u1ed5ng ph\u1ea7n m\u1ec1m c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n.<\/li>\n<li aria-level=\"1\">Nguy c\u01a1 b\u1ecb t\u1ea5n c\u00f4ng b\u1eb1ng c\u00e1ch \u0111o\u00e1n m\u1eadt kh\u1ea9u.<\/li>\n<li aria-level=\"1\">Kh\u1ea3 n\u0103ng b\u1ecb t\u1ea5n c\u00f4ng trung gian (Man-in-the-middle attack).<\/li>\n<\/ul>\n<h3>C\u00e1c ph\u1ea7n m\u1ec1m qu\u1ea3n tr\u1ecb h\u1ec7 th\u1ed1ng n\u00e0o c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u1edbi SSH?<\/h3>\n<p>\u0110\u1ec3 t\u0103ng c\u01b0\u1eddng hi\u1ec7u qu\u1ea3 c\u00f4ng vi\u1ec7c, SSH c\u00f3 th\u1ec3 t\u00edch h\u1ee3p v\u1edbi c\u00e1c ph\u1ea7n m\u1ec1m qu\u1ea3n tr\u1ecb h\u1ec7 th\u1ed1ng. \u0110i\u1ec1u n\u00e0y mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch nh\u01b0 t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00e1c t\u00e1c v\u1ee5 qu\u1ea3n tr\u1ecb, qu\u1ea3n l\u00fd t\u1eadp trung \u0111a m\u00e1y ch\u1ee7, c\u1ea3i thi\u1ec7n b\u1ea3o m\u1eadt v\u00e0 t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng h\u1ee3p t\u00e1c.<\/p>\n<p>Hy v\u1ecdng qua b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n \u0111\u00e3 c\u00f3 c\u00e1i nh\u00ecn r\u00f5 r\u00e0ng h\u01a1n v\u1ec1 SSH l\u00e0 g\u00ec v\u00e0 t\u1ea1i sao n\u00f3 quan tr\u1ecdng trong vi\u1ec7c qu\u1ea3n l\u00fd c\u00e1c m\u00e1y ch\u1ee7 v\u00e0 k\u1ebft n\u1ed1i an to\u00e0n. SSH kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t giao th\u1ee9c truy c\u1eadp t\u1eeb xa m\u00e0 c\u00f2n l\u00e0 c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd gi\u00fap b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n trong qu\u00e1 tr\u00ecnh trao \u0111\u1ed5i th\u00f4ng tin tr\u00ean m\u1ea1ng. V\u1edbi t\u00ednh n\u0103ng m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd v\u00e0 kh\u1ea3 n\u0103ng x\u00e1c th\u1ef1c an to\u00e0n, SSH \u0111\u00e3 tr\u1edf th\u00e0nh c\u00f4ng c\u1ee5 kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ed1i v\u1edbi c\u00e1c qu\u1ea3n tr\u1ecb vi\u00ean h\u1ec7 th\u1ed1ng v\u00e0 nh\u1eefng ng\u01b0\u1eddi l\u00e0m vi\u1ec7c trong l\u0129nh v\u1ef1c c\u00f4ng ngh\u1ec7 th\u00f4ng tin.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Contents1. SSH l\u00e0 g\u00ec?2. C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a SSH3. Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng SSH4. \u01afu \u0111i\u1ec3m c\u1ee7a SSH l\u00e0 g\u00ec?5. C\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a trong SSH l\u00e0 g\u00ec?6. C\u00e1c giai \u0111o\u1ea1n x\u1eed l\u00fd m\u00e3 h\u00f3a c\u1ee7a giao th\u1ee9c SSH7. M\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 b\u1ea3o m\u1eadt li\u00ean quan \u0111\u1ebfn SSH8. \u0110i\u1ec3m kh\u00e1c nhau gi\u1eefa [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":45443,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false},"categories":[278,279],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.12 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SSH L\u00e0 G\u00ec? 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