新鮮なsshログインで:
$ umask
0007
だが:
$ find . -maxdepth 1 -name '.*' -type f | xargs grep 007 | less
$
# grep 007 /etc/profile
#
# grep -i umask /etc/login.defs
# UMASK Default "umask" value.
# UMASK is the default umask value for pam_umask and is used by
# 022 is the "historical" value in Debian for UMASK
UMASK 027
# Other former uses of this variable such as setting the umask when
# grep -i umask /etc/pam.d/common-session
session optional pam_umask.so usergroups
WTF? Debian invents任意のumask ??そして、007に一致する/ etcの他のソースはありません!
システムは認証にLDAP(nscld、pam_ldap)を使用します
詳細:1人のユーザーにのみ発生します。 rootまたは別のユーザー向けではありません。 1人のユーザーに「su」するとすぐに、再び007を取得します。
ルートとして:
# strace -f -o basz.log su baduser
何かがこのumaskを設定していますが、私には何がわかりません:
[...]
2622 open("/etc/group", O_RDONLY|O_CLOEXEC) = 4
2622 _llseek(4, 0, [0], SEEK_CUR) = 0
2622 fstat64(4, {st_mode=S_IFREG|0644, st_size=1719, ...}) = 0
2622 mmap2(NULL, 1719, PROT_READ, MAP_SHARED, 4, 0) = 0xb7786000
2622 _llseek(4, 1719, [1719], SEEK_SET) = 0
2622 fstat64(4, {st_mode=S_IFREG|0644, st_size=1719, ...}) = 0
2622 munmap(0xb7786000, 1719) = 0
2622 close(4) = 0
2622 socket(PF_FILE, SOCK_STREAM, 0) = 4
2622 connect(4, {sa_family=AF_FILE, path="/var/run/nslcd/socket"}, 23) = 0
2622 gettimeofday({1404702848, 321946}, NULL) = 0
2622 gettimeofday({1404702848, 322029}, NULL) = 0
2622 poll([{fd=4, events=POLLOUT}], 1, 10000) = 1 ([{fd=4, revents=POLLOUT}])
2622 send(4, "\1\0\0\0\212\23\0\0\361\3\0\0", 12, MSG_NOSIGNAL) = 12
2622 gettimeofday({1404702848, 322363}, NULL) = 0
2622 gettimeofday({1404702848, 322464}, NULL) = 0
2622 poll([{fd=4, events=POLLIN}], 1, 60000) = 1 ([{fd=4, revents=POLLIN|POLLHUP}])
2622 read(4, "\1\0\0\0\212\23\0\0\0\0\0\0\4\0\0\0baduser\1\0\0\0*\361\3\0\0\2\0\0"..., 1024) = 57
2622 gettimeofday({1404702848, 323811}, NULL) = 0
2622 gettimeofday({1404702848, 323898}, NULL) = 0
2622 gettimeofday({1404702848, 323983}, NULL) = 0
2622 gettimeofday({1404702848, 324067}, NULL) = 0
2622 gettimeofday({1404702848, 324170}, NULL) = 0
2622 gettimeofday({1404702848, 324256}, NULL) = 0
2622 gettimeofday({1404702848, 324340}, NULL) = 0
2622 gettimeofday({1404702848, 324434}, NULL) = 0
2622 gettimeofday({1404702848, 324518}, NULL) = 0
2622 gettimeofday({1404702848, 324602}, NULL) = 0
2622 gettimeofday({1404702848, 324686}, NULL) = 0
2622 gettimeofday({1404702848, 324772}, NULL) = 0
2622 poll([{fd=4, events=POLLIN}], 1, 0) = 1 ([{fd=4, revents=POLLIN|POLLHUP}])
2622 read(4, "", 1024) = 0
2622 gettimeofday({1404702848, 325036}, NULL) = 0
2622 close(4) = 0
2622 umask(0777) = 027
2622 umask(07) = 0777
[...]
より詳しい情報:
答えは:
man pam_umask
usergroups
If the user is not root, and the user ID is equal to the group ID, and the
username is the same as primary group name, the umask group bits are set to
be the same as owner bits (examples: 022 -> 002, 077 -> 007).
おとこ ...