Ziti_resolve faults if host is NULL #525
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tomc797
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thank you for your PR. It compelled me to go look at to be more compliant, we should return |
library/zitilib.c
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| if ((rc = uv_ip4_addr(host, portnum, addr4)) == 0) { | ||
| ZITI_LOG(DEBUG, "host[%s] port[%s] rc = %d", host, port, rc); | ||
| if ((res->ai_family == AF_UNSPEC || res->ai_family == AF_INET) | ||
| && uv_ip4_addr(host ? host : "127.0.0.1", portnum, &addr->in4) == 0) { |
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if host == NULL we should just use INADDR_LOOPBACK or INADDR_ANY (see my other comment)
to avoid parsing
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Hi @ekoby -
Reflecting on the ziti security model, does it make sense to allow a socket to bind to INADDR_ANY by default? If the user is zitifying, should we stop insecure practices?
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There are certain OSs where ``sockaddr``` has a length field. For example, FreeBSD defines
/* Socket address, internet style. */
struct sockaddr_in {
uint8_t sin_len;
sa_family_t sin_family;
in_port_t sin_port;
struct in_addr sin_addr;
char sin_zero[8];
};The nice thing about uv_ip4_addr is that it hides the details. Otherwise, we need to employ a check for the existence of the field and then conditionally code for it.
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Turned out that sin_len checks are necessary as we are directly manipulating sockaddr_in members.
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Hi @ekoby -
Reflecting on the ziti security model, does it make sense to allow a socket to bind to
INADDR_ANYby default? If the user is zitifying, should we stop insecure practices?
zitify should not break current behavior of an app if connect/bind address is not something user is trying to zitify.
The fix addresses two defects. The getaddrinfo interface contract allowed for host == NULL, but Ziti_resolve assumed host != NULL. zitify nc -l 9999 would trigger a fault. Additionally, hints was accessed without checking to ensure it was NULL. Lastly, Ziti_resolve would leak res and addr if the function wasn't successful. Signed-off-by: Tom Carroll <4632752+tomc797@users.noreply.github.com>
4.3BSD-Reno added length member. Check for the member and define variable if it exists. Signed-off-by: Tom Carroll <4632752+tomc797@users.noreply.github.com>
Signed-off-by: Tom Carroll <4632752+tomc797@users.noreply.github.com>
tomc797
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| int rc = 0; | ||
| if ((rc = uv_ip4_addr(host, portnum, addr4)) == 0) { | ||
| ZITI_LOG(DEBUG, "host[%s] port[%s] rc = %d", host, port, rc); | ||
| if (!host) { |
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I wonder if it is easier to call native getaddrinfo() here since without host it cannot be an intercepted service. And it won't incur a DNS lookup.
on the second thought we should just return EAI_NONAME (no service with this intercept). It is up to the caller(zitify) to do a fallback to getaddrinfo()
The fix addresses a
Ziti_resolvedefects that triggers segfault. Thegetaddrinfointerface contract permitshost == NULL, butZiti_resolveassumeshost != NULL. Additionally,Ziti_resolveleaksresandaddrif error is signaled.