{"id":183605,"date":"2026-10-05T10:54:21","date_gmt":"2026-10-05T08:54:21","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/teo-de-raadt-predlozhil-izmeneniya-dlya-ogranicheniya-dostupa-k-fs-cherez-funkcziyu-openat"},"modified":"2026-10-05T10:54:25","modified_gmt":"2026-10-05T08:54:25","slug":"theo-de-raadt-proposed-changes-to-restrict-filesystem-access-via-openat","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/news\/theo-de-raadt-proposed-changes-to-restrict-filesystem-access-via-openat","title":{"rendered":"Teo de Raadt propozoi ndryshime p\u00ebr t\u00eb kufizuar qasje n\u00eb sistemin e skedar\u00ebve p\u00ebrmes funksionit openat","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Teo de Raadt ka propozuar q\u00eb t\u00eb p\u00ebrfshihet nj\u00eb mekaniz\u00ebm i ri n\u00eb OpenBSD p\u00ebr t\u00eb zvog\u00ebluar sip\u00ebrfaqen e sulmeve, i implementuar p\u00ebrmes zgjerimit t\u00eb mund\u00ebsive t\u00eb thirrjes s\u00eb sistemit openat. Patch-et me implementimin e flamur\u00ebve shtes\u00eb p\u00ebr openat dhe open, q\u00eb kufizojn\u00eb mund\u00ebsin\u00eb e kalimit n\u00eb katalog\u00ebt e sip\u00ebrm p\u00ebrmes \"..\/\" dhe aksesit p\u00ebr rrug\u00eb t\u00eb plota, jan\u00eb p\u00ebrgatitur p\u00ebr kernelin, libc, si dhe disa aplikacione nga sistemi baz\u00eb. Ndryshimet akoma nuk jan\u00eb p\u00ebrfshir\u00eb n\u00eb OpenBSD-current dhe jan\u00eb n\u00eb faz\u00ebn e diskutimit mes zhvilluesve. <\/p>\n

Familja e thirrjeve t\u00eb sistemit openat(2) funksionon si nj\u00eb analog i open(2) p\u00ebrve\u00e7 se, n\u00ebse n\u00eb parametrin \"path\" \u00ebsht\u00eb specifikuar nj\u00eb rrug\u00eb relative, skedari q\u00eb hapet caktohet n\u00eb lidhje me katalogun e lidhur me skedarin e dosjes \"fd\", jo n\u00eb lidhje me katalogun aktual t\u00eb pun\u00ebs. N\u00ebse i d\u00ebrgoni openat nj\u00eb rrug\u00eb t\u00eb plot\u00eb, p\u00ebr shembull: int dirfd = open(\"\/tmp\", O_RDONLY | O_DIRECTORY); int hfd = openat(dirfd, \"\/etc\/hosts\", O_RDONLY); <\/p>\n

funksioni openat() do t\u00eb injoroj\u00eb \"dirfd\" dhe, si pasoj\u00eb, rruga e plot\u00eb do t\u00eb trajtohet n\u00eb m\u00ebnyr\u00eb t\u00eb zakonshme. <\/p>\n

Prandaj, z\u00ebvend\u00ebsimi i open() me openat() vetvetiu nuk rrit sigurin\u00eb e programit. Nj\u00eb thirrje e till\u00eb mund t\u00eb p\u00ebrshpejtoj\u00eb analiz\u00ebn e rrug\u00ebs, por nuk kufizon aksesin n\u00eb sistemin e skedar\u00ebve. Flamujt q\u00eb ndalojn\u00eb rrug\u00ebt absolute (p.sh., RESOLVE_BENEATH dhe\/ose RESOLVE_IN_ROOT p\u00ebr openat2 n\u00eb Linux) nuk garantojn\u00eb mbrojtje: programuesi duhet t'i shtoj\u00eb ato n\u00eb t\u00eb gjitha thirrjet p\u00ebrkat\u00ebse, dhe gjat\u00eb marrjes s\u00eb kontrollit t\u00eb procesit, nj\u00eb sulmues mund t\u00eb p\u00ebrdor\u00eb rrug\u00eb t\u00eb tjera p\u00ebr hapjen e skedar\u00ebve. <\/p>\n

Gjat\u00eb pun\u00ebs mbi utilitarin openrsync, Teo kishte nevoj\u00eb t\u00eb kufizonte aft\u00ebsit\u00eb e tij p\u00ebr t\u00eb kaluar n\u00ebp\u00ebr sistemin e skedar\u00ebve, por t\u00eb b\u00ebhet k\u00ebshtu duke p\u00ebrdorur funksionet unveil() dhe pledge() ishte e pamundur. At\u00ebher\u00eb lindi ideja p\u00ebr nj\u00eb mekaniz\u00ebm si openat(), por me karakteristika sigurie q\u00eb plot\u00ebsojn\u00eb pledge\/unveil ose madje funksionojn\u00eb n\u00eb munges\u00eb t\u00eb tyre. <\/p>\n

Ideja kryesore \u00ebsht\u00eb t\u00eb b\u00ebj\u00eb q\u00eb kufizimet t\u00eb jen\u00eb pjes\u00eb e vet\u00eb skedarit t\u00eb dosjes. P\u00ebr k\u00ebt\u00eb, propozohet nj\u00eb flamur F_BELOW, i cili mund t\u00eb vendoset p\u00ebrmes fcntl(), ose flamuri O_BELOW p\u00ebr open(). Skedari \"dirfd\" i kufizuar n\u00eb k\u00ebt\u00eb m\u00ebnyr\u00eb do t\u00eb lejoj\u00eb vet\u00ebm kalime posht\u00eb n\u00eb pem\u00ebn e katalogjeve: thirrjet openat() me rrug\u00eb t\u00eb plot\u00eb ose me kalim lart p\u00ebrmes \"..\" do t\u00eb p\u00ebrfundojn\u00eb me nj\u00eb gabim ENOENT. N\u00eb rast sulmi q\u00eb \u00e7on n\u00eb ekzekutimin e kodit, tabela e skedar\u00ebve t\u00eb dosjeve t\u00eb procesit do t\u00eb p\u00ebrmbaj\u00eb \"dirfd\" m\u00eb pak funksional, \u00e7ka do t\u00eb kufizoj\u00eb sip\u00ebrfaqen e sulmit.
\n
Burimi: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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