| … | |
… | |
| 31 | |
31 | |
| 32 | #include <sys/types.h> |
32 | #include <sys/types.h> |
| 33 | #include <sys/socket.h> |
33 | #include <sys/socket.h> |
| 34 | #include <unistd.h> |
34 | #include <unistd.h> |
| 35 | #include <fcntl.h> |
35 | #include <fcntl.h> |
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36 | #include <errno.h> |
| 36 | |
37 | |
| 37 | // helper/proxy support |
38 | // helper/proxy support |
| 38 | |
39 | |
| 39 | #if PTYTTY_HELPER |
40 | #if PTYTTY_HELPER |
| 40 | |
41 | |
| … | |
… | |
| 295 | #endif |
296 | #endif |
| 296 | return new ptytty_unix; |
297 | return new ptytty_unix; |
| 297 | } |
298 | } |
| 298 | |
299 | |
| 299 | void |
300 | void |
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301 | ptytty::sanitise_stdfd () |
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302 | { |
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303 | // sanitise stdin/stdout/stderr to point to *something*. |
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304 | for (int fd = 0; fd <= 2; ++fd) |
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305 | if (fcntl (fd, F_GETFL) < 0 && errno == EBADF) |
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306 | { |
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307 | int fd2 = open ("/dev/tty", fd ? O_WRONLY : O_RDONLY); |
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308 | |
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309 | if (fd2 < 0) |
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310 | fd2 = open ("/dev/null", fd ? O_WRONLY : O_RDONLY); |
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311 | |
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312 | if (fd2 != fd) |
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313 | abort (); |
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314 | } |
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315 | } |
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316 | |
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317 | void |
| 300 | ptytty::init () |
318 | ptytty::init () |
| 301 | { |
319 | { |
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320 | sanitise_stdfd (); |
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321 | |
| 302 | uid_t uid = getuid (); |
322 | uid_t uid = getuid (); |
| 303 | gid_t gid = getgid (); |
323 | gid_t gid = getgid (); |
| 304 | |
324 | |
| 305 | // before doing anything else, check for setuid/setgid operation, |
325 | // before doing anything else, check for setuid/setgid operation, |
| 306 | // start the helper process and drop privileges |
326 | // start the helper process and drop privileges |
