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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2019-07-24 11:15:42 +0000 |
|---|---|---|
| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2019-07-24 11:15:42 +0000 |
| commit | 7c228abccd8fbb79c6aa41179069cac1abae8ac1 (patch) | |
| tree | dfd9ea180799219f1357e8d4ce23602e6765e2ef | |
| parent | 3ea6a4d085262d69379b4946b3e990dc0b613f65 (diff) | |
| download | nsss-7c228abccd8fbb79c6aa41179069cac1abae8ac1.tar.xz | |
nsssd: always drop privileges to the client's
| -rw-r--r-- | src/nsssd/nsssd_main.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/src/nsssd/nsssd_main.c b/src/nsssd/nsssd_main.c index cc8a3f4..b26a74a 100644 --- a/src/nsssd/nsssd_main.c +++ b/src/nsssd/nsssd_main.c @@ -2,10 +2,13 @@ #include <string.h> #include <errno.h> +#include <unistd.h> +#include <stdlib.h> #include <skalibs/posixishard.h> #include <skalibs/uint32.h> #include <skalibs/uint64.h> +#include <skalibs/types.h> #include <skalibs/buffer.h> #include <skalibs/strerr2.h> #include <skalibs/tai.h> @@ -382,7 +385,25 @@ static inline void do_spnam (void *a) int nsssd_main (char const *const *argv, char const *const *envp) { - void *a = nsssd_handle_init() ; + void *a ; + + /* If root, drop privileges to the client's, because shadow */ + + if (!geteuid()) + { + uid_t uid ; + gid_t gid ; + char const *x = getenv("IPCREMOTEEGID") ; + if (!x) strerr_dienotset(100, "IPCREMOTEEGID") ; + if (!gid0_scan(x, &gid)) strerr_dieinvalid(100, "IPCREMOTEEGID") ; + if (setgid(gid) == -1) strerr_diefu2sys(111, "setgid to ", x) ; + x = getenv("IPCREMOTEEUID") ; + if (!x) strerr_dienotset(100, "IPCREMOTEEUID") ; + if (!uid0_scan(x, &uid)) strerr_dieinvalid(100, "IPCREMOTEEUID") ; + if (setuid(uid) == -1) strerr_diefu2sys(111, "setuid to ", x) ; + } + + a = nsssd_handle_init() ; if (ndelay_on(0) < 0) strerr_diefu1sys(111, "set stdin non-blocking") ; tain_now_g() ; if (!nsssd_handle_start(a, argv, envp)) |