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Open Source and information security mailing list archives
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Date: Fri, 28 Feb 2014 10:12:51 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: Richard Haines <richard_c_haines@...nternet.com>
Cc: netdev@...r.kernel.org, selinux@...ho.nsa.gov
Subject: Re: [PATCH V2] ss: Add support for retrieving SELinux contexts
On Fri, 21 Feb 2014 12:34:00 +0000
Richard Haines <richard_c_haines@...nternet.com> wrote:
> The process SELinux contexts can be added to the output using the -Z
> option. Using the -z option will show the process and socket contexts (see
> the man page for details).
> For netlink sockets: if valid process show process context, if pid = 0
> show kernel initial context, if unknown show "not available".
>
> Signed-off-by: Richard Haines <richard_c_haines@...nternet.com>
> ---
> configure | 15 +++
> man/man8/ss.8 | 34 ++++++
> misc/Makefile | 12 ++
> misc/ss.c | 375 ++++++++++++++++++++++++++++++++++++++++++++++++++--------
> 4 files changed, 386 insertions(+), 50 deletions(-)
>
> diff --git a/configure b/configure
> index da01c19..d5170f0 100755
> --- a/configure
> +++ b/configure
> @@ -231,6 +231,18 @@ EOF
> rm -f $TMPDIR/ipsettest.c $TMPDIR/ipsettest
> }
>
> +check_selinux()
> +# SELinux is a compile time option in the ss utility
> +{
> + if ${PKG_CONFIG} libselinux --exists
> + then
> + echo "HAVE_SELINUX:=y" >>Config
> + echo "yes"
> + else
> + echo "no"
> + fi
> +}
> +
> echo "# Generated config based on" $INCLUDE >Config
> check_toolchain
>
> @@ -253,3 +265,6 @@ check_ipt_lib_dir
>
> echo -n "libc has setns: "
> check_setns
> +
> +echo -n "SELinux support: "
> +check_selinux
> diff --git a/man/man8/ss.8 b/man/man8/ss.8
> index 807d9dc..d6e43ba 100644
> --- a/man/man8/ss.8
> +++ b/man/man8/ss.8
> @@ -53,6 +53,37 @@ Print summary statistics. This option does not parse socket lists obtaining
> summary from various sources. It is useful when amount of sockets is so huge
> that parsing /proc/net/tcp is painful.
> .TP
> +.B \-Z, \-\-context
> +As the
> +.B \-p
> +option but also shows process security context.
> +.sp
> +For
> +.BR netlink (7)
> +sockets the initiating process context is displayed as follows:
> +.RS
> +.RS
> +.IP "1." 4
> +If valid pid show the process context.
> +.IP "2." 4
> +If destination is kernel (pid = 0) show kernel initial context.
> +.IP "3." 4
> +If a unique identifier has been allocated by the kernel or netlink user,
> +show context as "not available". This will generally indicate that a
> +process has more than one netlink socket active.
> +.RE
> +.RE
> +.TP
> +.B \-z, \-\-contexts
> +As the
> +.B \-Z
> +option but also shows the socket context. The socket context is
> +taken from the associated inode and is not the actual socket
> +context held by the kernel. Sockets are typically labeled with the
> +context of the creating process, however the context shown will reflect
> +any policy role, type and/or range transition rules applied,
> +and is therefore a useful reference.
> +.TP
> .B \-b, \-\-bpf
> Show socket BPF filters (only administrators are allowed to get these information).
> .TP
> @@ -103,6 +134,9 @@ Please take a look at the official documentation (Debian package iproute-doc) fo
> .B ss -t -a
> Display all TCP sockets.
> .TP
> +.B ss -t -a -Z
> +Display all TCP sockets with process SELinux security contexts.
> +.TP
> .B ss -u -a
> Display all UDP sockets.
> .TP
> diff --git a/misc/Makefile b/misc/Makefile
> index a59ff87..d1f295b 100644
> --- a/misc/Makefile
> +++ b/misc/Makefile
> @@ -8,6 +8,18 @@ include ../Config
> all: $(TARGETS)
>
> ss: $(SSOBJ)
> +ifeq ($(HAVE_SELINUX),y)
> + $(CC) $(LDFLAGS) -o $@ $(SSOBJ) $(LDLIBS) $(shell pkg-config --libs libselinux)
> +else
> + $(CC) $(LDFLAGS) -o $@ $(SSOBJ) $(LDLIBS)
> +endif
> +
> +ss.o: ss.c
> +ifeq ($(HAVE_SELINUX),y)
> + $(CC) $(CFLAGS) $(shell pkg-config --cflags libselinux) -DHAVE_SELINUX -c $+
> +else
> + $(CC) $(CFLAGS) -c $+
> +endif
>
> nstat: nstat.c
> $(CC) $(CFLAGS) $(LDFLAGS) -o nstat nstat.c -lm
> diff --git a/misc/ss.c b/misc/ss.c
> index ce6a0a8..c1b1617 100644
> --- a/misc/ss.c
> +++ b/misc/ss.c
> @@ -40,6 +40,9 @@
> #include <linux/filter.h>
> #include <linux/packet_diag.h>
> #include <linux/netlink_diag.h>
> +#if HAVE_SELINUX
> +#include <selinux/selinux.h>
> +#endif
>
> int resolve_hosts = 0;
> int resolve_services = 1;
> @@ -50,6 +53,12 @@ int show_users = 0;
> int show_mem = 0;
> int show_tcpinfo = 0;
> int show_bpf = 0;
> +#if HAVE_SELINUX
> +int show_proc_ctx = 0;
> +int show_sock_ctx = 0;
> +/* If show_users & show_proc_ctx only do user_ent_hash_build() once */
> +int user_ent_hash_build_init = 0;
> +#endif
>
> int netid_width;
> int state_width;
> @@ -207,7 +216,11 @@ struct user_ent {
> unsigned int ino;
> int pid;
> int fd;
> - char process[0];
> + char *process;
> +#if HAVE_SELINUX
> + char *process_ctx;
> + char *socket_ctx;
> +#endif
> };
>
> #define USER_ENT_HASH_SIZE 256
> @@ -220,26 +233,58 @@ static int user_ent_hashfn(unsigned int ino)
> return val & (USER_ENT_HASH_SIZE - 1);
> }
>
> -static void user_ent_add(unsigned int ino, const char *process, int pid, int fd)
> +#if HAVE_SELINUX
> +static void user_ent_add(unsigned int ino, char *process,
> + int pid, int fd,
> + char *proc_ctx,
> + char *sock_ctx)
> +#else
> +static void user_ent_add(unsigned int ino, char *process, int pid, int fd)
> +#endif
> {
> struct user_ent *p, **pp;
> - int str_len;
>
> - str_len = strlen(process) + 1;
> - p = malloc(sizeof(struct user_ent) + str_len);
> - if (!p)
> + p = malloc(sizeof(struct user_ent));
> + if (!p) {
> + fprintf(stderr, "ss: failed to malloc buffer\n");
> abort();
> + }
> p->next = NULL;
> p->ino = ino;
> p->pid = pid;
> p->fd = fd;
> - strcpy(p->process, process);
> + p->process = strdup(process);
> +#if HAVE_SELINUX
> + p->process_ctx = strdup(proc_ctx);
> + p->socket_ctx = strdup(sock_ctx);
> +#endif
>
> pp = &user_ent_hash[user_ent_hashfn(ino)];
> p->next = *pp;
> *pp = p;
> }
>
> +static void user_ent_destroy(void)
> +{
> + struct user_ent *p, *p_next;
> + int cnt = 0;
> +
> + while (cnt != USER_ENT_HASH_SIZE) {
> + p = user_ent_hash[cnt];
> + while (p) {
> + free(p->process);
> +#if HAVE_SELINUX
> + freecon(p->process_ctx);
> + freecon(p->socket_ctx);
> +#endif
> + p_next = p->next;
> + free(p);
> + p = p_next;
> + }
> + cnt++;
> + }
> +}
> +
> static void user_ent_hash_build(void)
> {
> const char *root = getenv("PROC_ROOT") ? : "/proc/";
> @@ -247,6 +292,17 @@ static void user_ent_hash_build(void)
> char name[1024];
> int nameoff;
> DIR *dir;
> +#if HAVE_SELINUX
> + char *pid_context;
> + char *sock_context;
> + char *no_ctx = "not available";
> +
> + /* If show_users and show_proc_ctx set only do this once */
> + if (user_ent_hash_build_init != 0)
> + return;
> +
> + user_ent_hash_build_init = 1;
> +#endif
>
> strcpy(name, root);
> if (strlen(name) == 0 || name[strlen(name)-1] != '/')
> @@ -261,19 +317,24 @@ static void user_ent_hash_build(void)
> while ((d = readdir(dir)) != NULL) {
> struct dirent *d1;
> char process[16];
> + char *p;
> int pid, pos;
> DIR *dir1;
> char crap;
>
> if (sscanf(d->d_name, "%d%c", &pid, &crap) != 1)
> continue;
> -
> +#if HAVE_SELINUX
> + if (getpidcon(pid, &pid_context) != 0)
> + pid_context = strdup(no_ctx);
> +#endif
> sprintf(name + nameoff, "%d/fd/", pid);
> pos = strlen(name);
> if ((dir1 = opendir(name)) == NULL)
> continue;
>
> process[0] = '\0';
> + p = process;
>
> while ((d1 = readdir(dir1)) != NULL) {
> const char *pattern = "socket:[";
> @@ -281,6 +342,7 @@ static void user_ent_hash_build(void)
> char lnk[64];
> int fd;
> ssize_t link_len;
> + char tmp[1024];
>
> if (sscanf(d1->d_name, "%d%c", &fd, &crap) != 1)
> continue;
> @@ -296,56 +358,122 @@ static void user_ent_hash_build(void)
> continue;
>
> sscanf(lnk, "socket:[%u]", &ino);
> -
> - if (process[0] == '\0') {
> - char tmp[1024];
> +#if HAVE_SELINUX
> + snprintf(tmp, sizeof(tmp), "%s/%d/fd/%s",
> + root, pid, d1->d_name);
> +
> + if (getfilecon(tmp, &sock_context) < 0)
> + sock_context = strdup(no_ctx);
> +#endif
> + if (*p == '\0') {
> FILE *fp;
>
> - snprintf(tmp, sizeof(tmp), "%s/%d/stat", root, pid);
> + snprintf(tmp, sizeof(tmp), "%s/%d/stat",
> + root, pid);
> if ((fp = fopen(tmp, "r")) != NULL) {
> - fscanf(fp, "%*d (%[^)])", process);
> + fscanf(fp, "%*d (%[^)])", p);
> fclose(fp);
> }
> }
> -
> - user_ent_add(ino, process, pid, fd);
> +#if HAVE_SELINUX
> + user_ent_add(ino, p, pid, fd,
> + pid_context, sock_context);
> + freecon(sock_context);
> }
> + freecon(pid_context);
> closedir(dir1);
> +#else
> + user_ent_add(ino, p, pid, fd);
> + }
> + closedir(dir1);
> +#endif
> }
> closedir(dir);
> }
>
> -static int find_users(unsigned ino, char *buf, int buflen)
> +#if HAVE_SELINUX
> +enum entry_types {
> + USERS,
> + PROC_CTX,
> + PROC_SOCK_CTX
> +};
> +#else
> +enum entry_types {
> + USERS
> +};
> +#endif
> +
> +#define ENTRY_BUF_SIZE 512
> +static int find_entry(unsigned ino, char **buf, int type)
> {
> struct user_ent *p;
> int cnt = 0;
> char *ptr;
> + char **new_buf = buf;
> + int len, new_buf_len;
> + int buf_used = 0;
> + int buf_len = 0;
>
> if (!ino)
> return 0;
>
> p = user_ent_hash[user_ent_hashfn(ino)];
> - ptr = buf;
> + ptr = *buf = NULL;
> while (p) {
> if (p->ino != ino)
> goto next;
>
> - if (ptr - buf >= buflen - 1)
> - break;
> + while (1) {
> + ptr = *buf + buf_used;
> + switch (type) {
> + case USERS:
> + len = snprintf(ptr, buf_len - buf_used,
> + "(\"%s\",pid=%d,fd=%d),",
> + p->process, p->pid, p->fd);
> + break;
> +#if HAVE_SELINUX
> + case PROC_CTX:
> + len = snprintf(ptr, buf_len - buf_used,
> + "(\"%s\",pid=%d,proc_ctx=%s,fd=%d),",
> + p->process, p->pid,
> + p->process_ctx, p->fd);
> + break;
> + case PROC_SOCK_CTX:
> + len = snprintf(ptr, buf_len - buf_used,
> + "(\"%s\",pid=%d,proc_ctx=%s,fd=%d,sock_ctx=%s),",
> + p->process, p->pid,
> + p->process_ctx, p->fd,
> + p->socket_ctx);
> + break;
> +#endif
> + default:
> + fprintf(stderr, "ss: invalid type: %d\n", type);
> + abort();
> + }
>
> - snprintf(ptr, buflen - (ptr - buf),
> - "(\"%s\",%d,%d),",
> - p->process, p->pid, p->fd);
> - ptr += strlen(ptr);
> + if (len < 0 || len >= buf_len - buf_used) {
> + new_buf_len = buf_len + ENTRY_BUF_SIZE;
> + *new_buf = realloc(*buf, new_buf_len);
> + if (!new_buf) {
> + fprintf(stderr, "ss: failed to malloc buffer\n");
> + abort();
> + }
> + **buf = **new_buf;
> + buf_len = new_buf_len;
> + continue;
> + } else {
> + buf_used += len;
> + break;
> + }
> + }
> cnt++;
> -
> - next:
> +next:
> p = p->next;
> }
> -
> - if (ptr != buf)
> + if (buf_used) {
> + ptr = *buf + buf_used;
> ptr[-1] = '\0';
> -
> + }
> return cnt;
> }
>
> @@ -1289,11 +1417,25 @@ static int tcp_show_line(char *line, const struct filter *f, int family)
> if (s.qack&1)
> printf(" bidir");
> }
> + char *buf = NULL;
> +#if HAVE_SELINUX
> + if (show_proc_ctx || show_sock_ctx) {
> + if (find_entry(s.ino, &buf,
> + (show_proc_ctx & show_sock_ctx) ?
> + PROC_SOCK_CTX : PROC_CTX) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> + } else if (show_users) {
> +#else
> if (show_users) {
> - char ubuf[4096];
> - if (find_users(s.ino, ubuf, sizeof(ubuf)) > 0)
> - printf(" users:(%s)", ubuf);
> +#endif
> + if (find_entry(s.ino, &buf, USERS) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> }
> +
> if (show_details) {
> if (s.uid)
> printf(" uid:%u", (unsigned)s.uid);
> @@ -1527,11 +1669,25 @@ static int inet_show_sock(struct nlmsghdr *nlh, struct filter *f, int protocol)
> r->idiag_retrans);
> }
> }
> + char *buf = NULL;
> +#if HAVE_SELINUX
> + if (show_proc_ctx || show_sock_ctx) {
> + if (find_entry(r->idiag_inode, &buf,
> + (show_proc_ctx & show_sock_ctx) ?
> + PROC_SOCK_CTX : PROC_CTX) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> + } else if (show_users) {
> +#else
> if (show_users) {
> - char ubuf[4096];
> - if (find_users(r->idiag_inode, ubuf, sizeof(ubuf)) > 0)
> - printf(" users:(%s)", ubuf);
> +#endif
> + if (find_entry(r->idiag_inode, &buf, USERS) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> }
> +
> if (show_details) {
> if (r->idiag_uid)
> printf(" uid:%u", (unsigned)r->idiag_uid);
> @@ -2016,10 +2172,23 @@ static int dgram_show_line(char *line, const struct filter *f, int family)
> formatted_print(&s.local, s.lport, 0);
> formatted_print(&s.remote, s.rport, 0);
>
> + char *buf = NULL;
> +#if HAVE_SELINUX
> + if (show_proc_ctx || show_sock_ctx) {
> + if (find_entry(s.ino, &buf,
> + (show_proc_ctx & show_sock_ctx) ?
> + PROC_SOCK_CTX : PROC_CTX) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> + } else if (show_users) {
> +#else
> if (show_users) {
> - char ubuf[4096];
> - if (find_users(s.ino, ubuf, sizeof(ubuf)) > 0)
> - printf(" users:(%s)", ubuf);
> +#endif
> + if (find_entry(s.ino, &buf, USERS) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> }
>
> if (show_details) {
> @@ -2206,10 +2375,23 @@ static void unix_list_print(struct unixstat *list, struct filter *f)
> printf("%*s %-*d %*s %-*d",
> addr_width, s->name ? : "*", serv_width, s->ino,
> addr_width, peer, serv_width, s->peer);
> + char *buf = NULL;
> +#if HAVE_SELINUX
> + if (show_proc_ctx || show_sock_ctx) {
> + if (find_entry(s->ino, &buf,
> + (show_proc_ctx & show_sock_ctx) ?
> + PROC_SOCK_CTX : PROC_CTX) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> + } else if (show_users) {
> +#else
> if (show_users) {
> - char ubuf[4096];
> - if (find_users(s->ino, ubuf, sizeof(ubuf)) > 0)
> - printf(" users:(%s)", ubuf);
> +#endif
> + if (find_entry(s->ino, &buf, USERS) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> }
> printf("\n");
> }
> @@ -2271,10 +2453,23 @@ static int unix_show_sock(struct nlmsghdr *nlh, struct filter *f)
> addr_width, "*", /* FIXME */
> serv_width, peer_ino);
>
> + char *buf = NULL;
> +#if HAVE_SELINUX
> + if (show_proc_ctx || show_sock_ctx) {
> + if (find_entry(r->udiag_ino, &buf,
> + (show_proc_ctx & show_sock_ctx) ?
> + PROC_SOCK_CTX : PROC_CTX) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> + } else if (show_users) {
> +#else
> if (show_users) {
> - char ubuf[4096];
> - if (find_users(r->udiag_ino, ubuf, sizeof(ubuf)) > 0)
> - printf(" users:(%s)", ubuf);
> +#endif
> + if (find_entry(r->udiag_ino, &buf, USERS) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> }
>
> if (show_mem) {
> @@ -2532,11 +2727,25 @@ static int packet_show_sock(struct nlmsghdr *nlh, struct filter *f)
> printf("%*s*%-*s",
> addr_width, "", serv_width, "");
>
> + char *buf = NULL;
> +#if HAVE_SELINUX
> + if (show_proc_ctx || show_sock_ctx) {
> + if (find_entry(r->pdiag_ino, &buf,
> + (show_proc_ctx & show_sock_ctx) ?
> + PROC_SOCK_CTX : PROC_CTX) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> + } else if (show_users) {
> +#else
> if (show_users) {
> - char ubuf[4096];
> - if (find_users(r->pdiag_ino, ubuf, sizeof(ubuf)) > 0)
> - printf(" users:(%s)", ubuf);
> +#endif
> + if (find_entry(r->pdiag_ino, &buf, USERS) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> }
> +
> if (show_details) {
> __u32 uid = 0;
>
> @@ -2727,11 +2936,25 @@ static int packet_show(struct filter *f)
> printf("%*s*%-*s",
> addr_width, "", serv_width, "");
>
> + char *buf = NULL;
> +#if HAVE_SELINUX
> + if (show_proc_ctx || show_sock_ctx) {
> + if (find_entry(ino, &buf,
> + (show_proc_ctx & show_sock_ctx) ?
> + PROC_SOCK_CTX : PROC_CTX) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> + } else if (show_users) {
> +#else
> if (show_users) {
> - char ubuf[4096];
> - if (find_users(ino, ubuf, sizeof(ubuf)) > 0)
> - printf(" users:(%s)", ubuf);
> +#endif
> + if (find_entry(ino, &buf, USERS) > 0) {
> + printf(" users:(%s)", buf);
> + free(buf);
> + }
> }
> +
> if (show_details) {
> printf(" ino=%u uid=%u sk=%llx", ino, uid, sk);
> }
> @@ -2806,6 +3029,29 @@ static void netlink_show_one(struct filter *f,
> printf("%*s*%-*s",
> addr_width, "", serv_width, "");
> }
> +#if HAVE_SELINUX
> + char *pid_context = NULL;
> +
> + if (show_proc_ctx) {
> + /* The pid value will either be:
> + * 0 if destination kernel - show kernel initial context.
> + * A valid process pid - use getpidcon.
> + * A unique value allocated by the kernel or netlink user
> + * to the process - show context as "not available".
> + */
> + if (!pid)
> + security_get_initial_context("kernel", &pid_context);
> + else if (pid > 0)
> + getpidcon(pid, &pid_context);
> +
> + if (pid_context != NULL) {
> + printf("proc_ctx=%-*s ", serv_width, pid_context);
> + freecon(pid_context);
> + } else {
> + printf("proc_ctx=%-*s ", serv_width, "not available");
> + }
> + }
> +# endif
>
> if (show_details) {
> printf(" sk=%llx cb=%llx groups=0x%08x", sk, cb, groups);
> @@ -3081,6 +3327,8 @@ static void _usage(FILE *dest)
> " -i, --info show internal TCP information\n"
> " -s, --summary show socket usage summary\n"
> " -b, --bpf show bpf filter socket information\n"
> +" -Z, --context display process SELinux security contexts\n"
> +" -z, --contexts display process and socket SELinux security contexts\n"
> "\n"
> " -4, --ipv4 display only IP version 4 sockets\n"
> " -6, --ipv6 display only IP version 6 sockets\n"
> @@ -3170,6 +3418,8 @@ static const struct option long_opts[] = {
> { "filter", 1, 0, 'F' },
> { "version", 0, 0, 'V' },
> { "help", 0, 0, 'h' },
> + { "context", 0, 0, 'Z' },
> + { "contexts", 0, 0, 'z' },
> { 0 }
>
> };
> @@ -3188,7 +3438,7 @@ int main(int argc, char *argv[])
>
> current_filter.states = default_filter.states;
>
> - while ((ch = getopt_long(argc, argv, "dhaletuwxnro460spbf:miA:D:F:vV",
> + while ((ch = getopt_long(argc, argv, "dhaletuwxnro460spbf:miA:D:F:vVzZ",
> long_opts, NULL)) != EOF) {
> switch(ch) {
> case 'n':
> @@ -3348,6 +3598,23 @@ int main(int argc, char *argv[])
> case 'V':
> printf("ss utility, iproute2-ss%s\n", SNAPSHOT);
> exit(0);
> + case 'z':
> +#if HAVE_SELINUX
> + show_sock_ctx++;
> +#endif
> + case 'Z':
> +#if HAVE_SELINUX
> + if (is_selinux_enabled() <= 0) {
> + fprintf(stderr, "ss: SELinux is not enabled.\n");
> + exit(1);
> + }
> + show_proc_ctx++;
> + user_ent_hash_build();
> +#else
> + fprintf(stderr, "ss: version does not support SELinux.\n");
> + exit(1);
> +#endif
> + break;
> case 'h':
> case '?':
> help();
> @@ -3535,5 +3802,13 @@ int main(int argc, char *argv[])
> tcp_show(¤t_filter, IPPROTO_TCP);
> if (current_filter.dbs & (1<<DCCP_DB))
> tcp_show(¤t_filter, IPPROTO_DCCP);
> +
> +#if HAVE_SELINUX
> + if (show_users || show_proc_ctx || show_sock_ctx)
> +#else
> + if (show_users)
> +#endif
> + user_ent_destroy();
> +
> return 0;
> }
This is too messy to merge right now, it creates multiple paths in existing code.
Can you do this without all the ifdef code. Just make a small set of functions
that return false if SELINUX not present. for example, just make a
stub for is_selinux_enabled() which always returns false if the library is
not available.
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