From a7cb5a49bf64ba64864ae16a6be028f8b0d3cc06 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 24 May 2012 01:10:10 -0600 Subject: userns: Print out socket uids in a user namespace aware fashion. Cc: Alexey Kuznetsov Cc: James Morris Cc: Hideaki YOSHIFUJI Cc: Patrick McHardy Cc: Arnaldo Carvalho de Melo Cc: Sridhar Samudrala Acked-by: Vlad Yasevich Acked-by: David S. Miller Acked-by: Serge Hallyn Signed-off-by: Eric W. Biederman --- net/ipv4/ping.c | 4 +++- net/ipv4/raw.c | 4 +++- net/ipv4/tcp_ipv4.c | 6 +++--- net/ipv4/udp.c | 4 +++- 4 files changed, 12 insertions(+), 6 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c index 6232d476f37e..bee5eeb676f8 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -845,7 +845,9 @@ static void ping_format_sock(struct sock *sp, struct seq_file *f, bucket, src, srcp, dest, destp, sp->sk_state, sk_wmem_alloc_get(sp), sk_rmem_alloc_get(sp), - 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), + 0, 0L, 0, + from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), + 0, sock_i_ino(sp), atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops), len); } diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index ff0f071969ea..f2425785d40a 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -992,7 +992,9 @@ static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) i, src, srcp, dest, destp, sp->sk_state, sk_wmem_alloc_get(sp), sk_rmem_alloc_get(sp), - 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), + 0, 0L, 0, + from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), + 0, sock_i_ino(sp), atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); } diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 42b2a6a73092..642be8a4c6a3 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2382,7 +2382,7 @@ void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) EXPORT_SYMBOL(tcp_proc_unregister); static void get_openreq4(const struct sock *sk, const struct request_sock *req, - struct seq_file *f, int i, int uid, int *len) + struct seq_file *f, int i, kuid_t uid, int *len) { const struct inet_request_sock *ireq = inet_rsk(req); int ttd = req->expires - jiffies; @@ -2399,7 +2399,7 @@ static void get_openreq4(const struct sock *sk, const struct request_sock *req, 1, /* timers active (only the expire timer) */ jiffies_to_clock_t(ttd), req->retrans, - uid, + from_kuid_munged(seq_user_ns(f), uid), 0, /* non standard timer */ 0, /* open_requests have no inode */ atomic_read(&sk->sk_refcnt), @@ -2450,7 +2450,7 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len) timer_active, jiffies_to_clock_t(timer_expires - jiffies), icsk->icsk_retransmits, - sock_i_uid(sk), + from_kuid_munged(seq_user_ns(f), sock_i_uid(sk)), icsk->icsk_probes_out, sock_i_ino(sk), atomic_read(&sk->sk_refcnt), sk, diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index b4c3582a991f..53b89817c008 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2110,7 +2110,9 @@ static void udp4_format_sock(struct sock *sp, struct seq_file *f, bucket, src, srcp, dest, destp, sp->sk_state, sk_wmem_alloc_get(sp), sk_rmem_alloc_get(sp), - 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), + 0, 0L, 0, + from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), + 0, sock_i_ino(sp), atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops), len); } -- cgit v1.2.3 From 7064d16e162adf8199f0288b694e6af823ed5431 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 24 May 2012 10:34:21 -0600 Subject: userns: Use kgids for sysctl_ping_group_range - Store sysctl_ping_group_range as a paire of kgid_t values instead of a pair of gid_t values. - Move the kgid conversion work from ping_init_sock into ipv4_ping_group_range - For invalid cases reset to the default disabled state. With the kgid_t conversion made part of the original value sanitation from userspace understand how the code will react becomes clearer and it becomes possible to set the sysctl ping group range from something other than the initial user namespace. Cc: Vasiliy Kulikov Acked-by: David S. Miller Signed-off-by: Eric W. Biederman --- include/net/netns/ipv4.h | 3 ++- init/Kconfig | 1 - net/ipv4/ping.c | 18 ++++++------------ net/ipv4/sysctl_net_ipv4.c | 42 +++++++++++++++++++++++++++--------------- 4 files changed, 35 insertions(+), 29 deletions(-) (limited to 'net/ipv4') diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h index 1474dd65c66f..3516dc0cc615 100644 --- a/include/net/netns/ipv4.h +++ b/include/net/netns/ipv4.h @@ -5,6 +5,7 @@ #ifndef __NETNS_IPV4_H__ #define __NETNS_IPV4_H__ +#include #include struct tcpm_hash_bucket; @@ -62,7 +63,7 @@ struct netns_ipv4 { int sysctl_icmp_ratemask; int sysctl_icmp_errors_use_inbound_ifaddr; - unsigned int sysctl_ping_group_range[2]; + kgid_t sysctl_ping_group_range[2]; long sysctl_tcp_mem[3]; atomic_t rt_genid; diff --git a/init/Kconfig b/init/Kconfig index 25a6ebb50c64..f857f97bcef3 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -948,7 +948,6 @@ config UIDGID_CONVERTED depends on NETFILTER_XT_MATCH_RECENT = n depends on NETFILTER_XT_TARGET_LOG = n depends on NETFILTER_NETLINK_LOG = n - depends on INET = n depends on IPV6 = n depends on AF_RXRPC = n depends on NET_KEY = n diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c index bee5eeb676f8..8f3d05424a3e 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -185,10 +185,10 @@ exit: return sk; } -static void inet_get_ping_group_range_net(struct net *net, gid_t *low, - gid_t *high) +static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, + kgid_t *high) { - gid_t *data = net->ipv4.sysctl_ping_group_range; + kgid_t *data = net->ipv4.sysctl_ping_group_range; unsigned int seq; do { @@ -203,19 +203,13 @@ static void inet_get_ping_group_range_net(struct net *net, gid_t *low, static int ping_init_sock(struct sock *sk) { struct net *net = sock_net(sk); - gid_t group = current_egid(); - gid_t range[2]; + kgid_t group = current_egid(); struct group_info *group_info = get_current_groups(); int i, j, count = group_info->ngroups; kgid_t low, high; - inet_get_ping_group_range_net(net, range, range+1); - low = make_kgid(&init_user_ns, range[0]); - high = make_kgid(&init_user_ns, range[1]); - if (!gid_valid(low) || !gid_valid(high) || gid_lt(high, low)) - return -EACCES; - - if (range[0] <= group && group <= range[1]) + inet_get_ping_group_range_net(net, &low, &high); + if (gid_lte(low, group) && gid_lte(group, high)) return 0; for (i = 0; i < group_info->nblocks; i++) { diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index 1b5ce96707a3..3e78c79b5586 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -76,9 +76,9 @@ static int ipv4_local_port_range(ctl_table *table, int write, } -static void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, gid_t *high) +static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high) { - gid_t *data = table->data; + kgid_t *data = table->data; unsigned int seq; do { seq = read_seqbegin(&sysctl_local_ports.lock); @@ -89,12 +89,12 @@ static void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, } /* Update system visible IP port range */ -static void set_ping_group_range(struct ctl_table *table, gid_t range[2]) +static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high) { - gid_t *data = table->data; + kgid_t *data = table->data; write_seqlock(&sysctl_local_ports.lock); - data[0] = range[0]; - data[1] = range[1]; + data[0] = low; + data[1] = high; write_sequnlock(&sysctl_local_ports.lock); } @@ -103,21 +103,33 @@ static int ipv4_ping_group_range(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { + struct user_namespace *user_ns = current_user_ns(); int ret; - gid_t range[2]; + gid_t urange[2]; + kgid_t low, high; ctl_table tmp = { - .data = &range, - .maxlen = sizeof(range), + .data = &urange, + .maxlen = sizeof(urange), .mode = table->mode, .extra1 = &ip_ping_group_range_min, .extra2 = &ip_ping_group_range_max, }; - inet_get_ping_group_range_table(table, range, range + 1); + inet_get_ping_group_range_table(table, &low, &high); + urange[0] = from_kgid_munged(user_ns, low); + urange[1] = from_kgid_munged(user_ns, high); ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); - if (write && ret == 0) - set_ping_group_range(table, range); + if (write && ret == 0) { + low = make_kgid(user_ns, urange[0]); + high = make_kgid(user_ns, urange[1]); + if (!gid_valid(low) || !gid_valid(high) || + (urange[1] < urange[0]) || gid_lt(high, low)) { + low = make_kgid(&init_user_ns, 1); + high = make_kgid(&init_user_ns, 0); + } + set_ping_group_range(table, low, high); + } return ret; } @@ -786,7 +798,7 @@ static struct ctl_table ipv4_net_table[] = { { .procname = "ping_group_range", .data = &init_net.ipv4.sysctl_ping_group_range, - .maxlen = sizeof(init_net.ipv4.sysctl_ping_group_range), + .maxlen = sizeof(gid_t)*2, .mode = 0644, .proc_handler = ipv4_ping_group_range, }, @@ -830,8 +842,8 @@ static __net_init int ipv4_sysctl_init_net(struct net *net) * Sane defaults - nobody may create ping sockets. * Boot scripts should set this to distro-specific group. */ - net->ipv4.sysctl_ping_group_range[0] = 1; - net->ipv4.sysctl_ping_group_range[1] = 0; + net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1); + net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0); tcp_init_mem(net); -- cgit v1.2.3 From d06ca9564350184a19b5aae9ac150f1b1306de29 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 24 May 2012 17:58:08 -0600 Subject: userns: Teach inet_diag to work with user namespaces Compute the user namespace of the socket that we are replying to and translate the kuids of reported sockets into that user namespace. Cc: Andrew Vagin Acked-by: David S. Miller Acked-by: Pavel Emelyanov Acked-by: Serge Hallyn Signed-off-by: Eric W. Biederman --- include/linux/inet_diag.h | 1 + init/Kconfig | 1 - net/ipv4/inet_diag.c | 21 +++++++++++++++------ net/ipv4/udp_diag.c | 5 ++++- 4 files changed, 20 insertions(+), 8 deletions(-) (limited to 'net/ipv4') diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h index f1362b5447fc..e788c186ed3a 100644 --- a/include/linux/inet_diag.h +++ b/include/linux/inet_diag.h @@ -159,6 +159,7 @@ struct inet_diag_handler { struct inet_connection_sock; int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, struct sk_buff *skb, struct inet_diag_req_v2 *req, + struct user_namespace *user_ns, u32 pid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh); void inet_diag_dump_icsk(struct inet_hashinfo *h, struct sk_buff *skb, diff --git a/init/Kconfig b/init/Kconfig index 8447e0ca4186..07435e0c3a4b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -950,7 +950,6 @@ config UIDGID_CONVERTED depends on NETFILTER_NETLINK_LOG = n depends on AF_RXRPC = n depends on NET_KEY = n - depends on INET_DIAG = n depends on DNS_RESOLVER = n # Filesystems diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index 570e61f9611f..8bc005b1435f 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -69,6 +69,7 @@ static inline void inet_diag_unlock_handler( int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, struct sk_buff *skb, struct inet_diag_req_v2 *req, + struct user_namespace *user_ns, u32 pid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { @@ -124,7 +125,7 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, } #endif - r->idiag_uid = sock_i_uid(sk); + r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); r->idiag_inode = sock_i_ino(sk); if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { @@ -199,11 +200,12 @@ EXPORT_SYMBOL_GPL(inet_sk_diag_fill); static int inet_csk_diag_fill(struct sock *sk, struct sk_buff *skb, struct inet_diag_req_v2 *req, + struct user_namespace *user_ns, u32 pid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { return inet_sk_diag_fill(sk, inet_csk(sk), - skb, req, pid, seq, nlmsg_flags, unlh); + skb, req, user_ns, pid, seq, nlmsg_flags, unlh); } static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, @@ -256,14 +258,16 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, } static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, - struct inet_diag_req_v2 *r, u32 pid, u32 seq, u16 nlmsg_flags, + struct inet_diag_req_v2 *r, + struct user_namespace *user_ns, + u32 pid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { if (sk->sk_state == TCP_TIME_WAIT) return inet_twsk_diag_fill((struct inet_timewait_sock *)sk, skb, r, pid, seq, nlmsg_flags, unlh); - return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh); + return inet_csk_diag_fill(sk, skb, r, user_ns, pid, seq, nlmsg_flags, unlh); } int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb, @@ -311,6 +315,7 @@ int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_s } err = sk_diag_fill(sk, rep, req, + sk_user_ns(NETLINK_CB(in_skb).ssk), NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, 0, nlh); if (err < 0) { @@ -551,6 +556,7 @@ static int inet_csk_diag_dump(struct sock *sk, return 0; return inet_csk_diag_fill(sk, skb, r, + sk_user_ns(NETLINK_CB(cb->skb).ssk), NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); } @@ -591,7 +597,9 @@ static int inet_twsk_diag_dump(struct inet_timewait_sock *tw, } static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, - struct request_sock *req, u32 pid, u32 seq, + struct request_sock *req, + struct user_namespace *user_ns, + u32 pid, u32 seq, const struct nlmsghdr *unlh) { const struct inet_request_sock *ireq = inet_rsk(req); @@ -625,7 +633,7 @@ static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk, r->idiag_expires = jiffies_to_msecs(tmo); r->idiag_rqueue = 0; r->idiag_wqueue = 0; - r->idiag_uid = sock_i_uid(sk); + r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); r->idiag_inode = 0; #if IS_ENABLED(CONFIG_IPV6) if (r->idiag_family == AF_INET6) { @@ -702,6 +710,7 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk, } err = inet_diag_fill_req(skb, sk, req, + sk_user_ns(NETLINK_CB(cb->skb).ssk), NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, cb->nlh); if (err < 0) { diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c index 16d0960062be..d2f336ea82ca 100644 --- a/net/ipv4/udp_diag.c +++ b/net/ipv4/udp_diag.c @@ -24,7 +24,9 @@ static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, if (!inet_diag_bc_sk(bc, sk)) return 0; - return inet_sk_diag_fill(sk, NULL, skb, req, NETLINK_CB(cb->skb).pid, + return inet_sk_diag_fill(sk, NULL, skb, req, + sk_user_ns(NETLINK_CB(cb->skb).ssk), + NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); } @@ -69,6 +71,7 @@ static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb, goto out; err = inet_sk_diag_fill(sk, NULL, rep, req, + sk_user_ns(NETLINK_CB(in_skb).ssk), NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, 0, nlh); if (err < 0) { -- cgit v1.2.3