[PATCH] net: allow CAP_NET_RAW to set socket options IP{,V6}_TRANSPARENT
From: Maciej Żenczykowski <hidden>
Date: 2011-10-20 22:10:25
Subsystem:
capabilities, networking [general], networking [ipv4/ipv6], the rest · Maintainers:
Serge Hallyn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
From: Maciej Żenczykowski <redacted>
Up till now the IP{,V6}_TRANSPARENT socket options (which actually set
the same bit in the socket struct) have required CAP_NET_ADMIN
privileges to set or clear the option.
- we make clearing the bit not require any privileges.
- we allow CAP_NET_ADMIN to set the bit (as before this change)
- we allow CAP_NET_RAW to set this bit, because raw
sockets already pretty much effectively allow you
to emulate socket transparency.
Signed-off-by: Maciej Żenczykowski <redacted>
---
include/linux/capability.h | 3 ++-
net/ipv4/ip_sockglue.c | 2 +-
net/ipv6/ipv6_sockglue.c | 2 +-
3 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/include/linux/capability.h b/include/linux/capability.h
index c421123..a63d13d 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h@@ -198,7 +198,7 @@ struct cpu_vfs_cap_data { /* Allow modification of routing tables */ /* Allow setting arbitrary process / process group ownership on sockets */ -/* Allow binding to any address for transparent proxying */ +/* Allow binding to any address for transparent proxying (also via NET_RAW) */ /* Allow setting TOS (type of service) */ /* Allow setting promiscuous mode */ /* Allow clearing driver statistics */
@@ -210,6 +210,7 @@ struct cpu_vfs_cap_data { /* Allow use of RAW sockets */ /* Allow use of PACKET sockets */ +/* Allow binding to any address for transparent proxying (also via NET_ADMIN) */ #define CAP_NET_RAW 13
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 8905e92..f0dc3ad 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c@@ -961,7 +961,7 @@ mc_msf_out: break; case IP_TRANSPARENT: - if (!capable(CAP_NET_ADMIN)) { + if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) { err = -EPERM; break; }
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 2fbda5f..c99e3ee 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c@@ -343,7 +343,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, break; case IPV6_TRANSPARENT: - if (!capable(CAP_NET_ADMIN)) { + if (valbool && !capable(CAP_NET_ADMIN) && !capable(CAP_NET_RAW)) { retv = -EPERM; break; }
--
1.7.3.1