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7cf66bc161
This change introduces the nointernet() function which may be called to prevent a process and its descendants from communicating with publicly routable Internet addresses. GNU Make has been modified to always call this function. In the future Landlock Make will have a way to whitelist subnets to override this behavior, or disable it entirely. Support is available for Linux only. Our firewall does not require root access. Calling nointernet() will return control to the caller inside a new process that has a SECCOMP BPF filter installed, which traps network related system calls. Your original process then becomes a permanent ptrace() supervisor that monitors all processes and threads descending from the returned child. Whenever a networking system call happens the kernel will stop the process and wakes up the monitor, which then peeks into the child memory to read the sockaddr_in to determine if it's ok. The downside to doing this is that there can be only one supervisor at a time using ptrace() on a process. So this firewall won't be enabled if you run make under strace or inside gdb. It also makes testing tricky.
48 lines
2 KiB
C
48 lines
2 KiB
C
#ifndef COSMOPOLITAN_LIBC_SOCK_SOCK_H_
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#define COSMOPOLITAN_LIBC_SOCK_SOCK_H_
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#include "libc/intrin/bswap.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/*───────────────────────────────────────────────────────────────────────────│─╗
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│ cosmopolitan § system api » berkeley sockets ─╬─│┼
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╚────────────────────────────────────────────────────────────────────────────│*/
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#define INET_ADDRSTRLEN 22
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#define htons(u16) bswap_16(u16)
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#define ntohs(u16) bswap_16(u16)
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#define htonl(u32) bswap_32(u32)
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#define ntohl(u32) bswap_32(u32)
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#define IFHWADDRLEN 6
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#define IF_NAMESIZE 16
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#define IFNAMSIZ IF_NAMESIZE
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const char *inet_ntop(int, const void *, char *, uint32_t);
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int inet_pton(int, const char *, void *);
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uint32_t inet_addr(const char *);
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int parseport(const char *);
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uint32_t *GetHostIps(void);
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int nointernet(void);
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int socket(int, int, int);
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int accept(int, void *, uint32_t *);
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int accept4(int, void *, uint32_t *, int);
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int bind(int, const void *, uint32_t);
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int connect(int, const void *, uint32_t);
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int listen(int, int);
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int shutdown(int, int);
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int getsockname(int, void *, uint32_t *);
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int getpeername(int, void *, uint32_t *);
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ssize_t send(int, const void *, size_t, int);
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ssize_t recv(int, void *, size_t, int);
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ssize_t recvfrom(int, void *, size_t, uint32_t, void *, uint32_t *);
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ssize_t sendfile(int, int, int64_t *, size_t);
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int getsockopt(int, int, int, void *, uint32_t *);
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int setsockopt(int, int, int, const void *, uint32_t);
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int socketpair(int, int, int, int[2]);
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ssize_t sendto(int, const void *, size_t, uint32_t, const void *, uint32_t);
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_SOCK_SOCK_H_ */
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