diff options
| -rw-r--r-- | man/systemd-nspawn.xml | 25 | ||||
| -rw-r--r-- | src/nspawn/nspawn.c | 11 |
2 files changed, 28 insertions, 8 deletions
diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml index 7a88436bcf..ffd707092c 100644 --- a/man/systemd-nspawn.xml +++ b/man/systemd-nspawn.xml @@ -277,7 +277,15 @@ the container. This makes all network interfaces unavailable in the container, with the exception of the - loopback device.</para></listitem> + loopback device and those specified + with + <option>--network-interface=</option>. If + this option is specified the + CAP_NET_ADMIN capability will be added + to the set of capabilities the + container retains. The latter may be + disabled by using + <option>--drop-capability=</option>.</para></listitem> </varlistentry> <varlistentry> @@ -290,7 +298,13 @@ namespace and place it in the container. When the container terminates it is moved back to the - host namespace.</para></listitem> + host namespace. Note that + <option>--network-interface=</option> + implies + <option>--private-network</option>. This + option may be used more than once to + add multiple network interfaces to the + container.</para></listitem> </varlistentry> <varlistentry> @@ -323,8 +337,11 @@ CAP_SYS_CHROOT, CAP_SYS_NICE, CAP_SYS_PTRACE, CAP_SYS_TTY_CONFIG, CAP_SYS_RESOURCE, CAP_SYS_BOOT, - CAP_AUDIT_WRITE, CAP_AUDIT_CONTROL. If - the special value + CAP_AUDIT_WRITE, + CAP_AUDIT_CONTROL. Also CAP_NET_ADMIN + is retained if + <option>--private-network</option> is + specified. If the special value <literal>all</literal> is passed all capabilities are retained.</para></listitem> diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c index 679c005071..9ce1fa9b49 100644 --- a/src/nspawn/nspawn.c +++ b/src/nspawn/nspawn.c @@ -216,6 +216,7 @@ static int parse_argv(int argc, char *argv[]) { }; int c, r; + uint64_t plus = 0, minus = 0; assert(argc >= 0); assert(argv); @@ -325,9 +326,9 @@ static int parse_argv(int argc, char *argv[]) { if (streq(t, "all")) { if (c == ARG_CAPABILITY) - arg_retain = (uint64_t) -1; + plus = (uint64_t) -1; else - arg_retain = 0; + minus = (uint64_t) -1; } else { if (cap_from_name(t, &cap) < 0) { log_error("Failed to parse capability %s.", t); @@ -335,9 +336,9 @@ static int parse_argv(int argc, char *argv[]) { } if (c == ARG_CAPABILITY) - arg_retain |= 1ULL << (uint64_t) cap; + plus |= 1ULL << (uint64_t) cap; else - arg_retain &= ~(1ULL << (uint64_t) cap); + minus |= 1ULL << (uint64_t) cap; } } @@ -460,6 +461,8 @@ static int parse_argv(int argc, char *argv[]) { return -EINVAL; } + arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus; + return 1; } |