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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
commit | 5e61585d76ae77fd5e9e96ebabb57afa4d74880d (patch) | |
tree | 2b467823aaeebc7ef8bc9e3cabe8074eaef1666d /src/util/unsafe.c | |
parent | Initial commit. (diff) | |
download | postfix-5b7b6342ca8708be5ee306c089f8c5b3d3d122d8.tar.xz postfix-5b7b6342ca8708be5ee306c089f8c5b3d3d122d8.zip |
Adding upstream version 3.5.24.upstream/3.5.24upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/util/unsafe.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/util/unsafe.c b/src/util/unsafe.c new file mode 100644 index 0000000..5d307c9 --- /dev/null +++ b/src/util/unsafe.c @@ -0,0 +1,77 @@ +/*++ +/* NAME +/* unsafe 3 +/* SUMMARY +/* are we running at non-user privileges +/* SYNOPSIS +/* #include <safe.h> +/* +/* int unsafe() +/* DESCRIPTION +/* The \fBunsafe()\fR routine attempts to determine if the process +/* (runs with privileges or has access to information) that the +/* controlling user has no access to. The purpose is to prevent +/* misuse of privileges, including access to protected information. +/* +/* The result is always false when both of the following conditions +/* are true: +/* .IP \(bu +/* The real UID is zero. +/* .IP \(bu +/* The effective UID is zero. +/* .PP +/* Otherwise, the result is true if any of the following conditions +/* is true: +/* .IP \(bu +/* The issetuid kernel flag is non-zero (on systems that support +/* this concept). +/* .IP \(bu +/* The real and effective user id differ. +/* .IP \(bu +/* The real and effective group id differ. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/* +/* Wietse Venema +/* Google, Inc. +/* 111 8th Avenue +/* New York, NY 10011, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <unistd.h> + +/* Utility library. */ + +#include "safe.h" + +/* unsafe - can we trust user-provided environment, working directory, etc. */ + +int unsafe(void) +{ + + /* + * The super-user is trusted. + */ + if (getuid() == 0 && geteuid() == 0) + return (0); + + /* + * Danger: don't trust inherited process attributes, and don't leak + * privileged info that the parent has no access to. + */ + return (geteuid() != getuid() +#ifdef HAS_ISSETUGID + || issetugid() +#endif + || getgid() != getegid()); +} |