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6cd17e53fa818889ce3d8d5189c230332676ba44
openresty/patches/nginx-1.9.7-resolver_security_fixes.patch
Yichun Zhang (agentzh) 8c6b0f77af bugfix: applied nginx-1.9.7-resolver_security_fixes.patch by default.
2016-01-28 09:28:18 -08:00

566 lines
17 KiB
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diff -upr nginx-1.9.7-old/src/core/ngx_resolver.c nginx-1.9.7/src/core/ngx_resolver.c
--- nginx-1.9.7-old/src/core/ngx_resolver.c 2016-01-26 11:54:55.915406799 -0800
+++ nginx-1.9.7/src/core/ngx_resolver.c 2016-01-26 11:55:27.067782268 -0800
@@ -59,15 +59,15 @@ ngx_int_t ngx_udp_connect(ngx_udp_connec
static void ngx_resolver_cleanup(void *data);
static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree);
static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r,
- ngx_resolver_ctx_t *ctx);
+ ngx_resolver_ctx_t *ctx, ngx_str_t *name);
static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree,
ngx_queue_t *queue);
static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r,
ngx_resolver_node_t *rn);
-static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn,
- ngx_resolver_ctx_t *ctx);
-static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn,
- ngx_resolver_ctx_t *ctx);
+static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_t *r,
+ ngx_resolver_node_t *rn, ngx_str_t *name);
+static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_t *r,
+ ngx_resolver_node_t *rn, ngx_addr_t *addr);
static void ngx_resolver_resend_handler(ngx_event_t *ev);
static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree,
ngx_queue_t *queue);
@@ -376,7 +376,7 @@ ngx_resolve_name(ngx_resolver_ctx_t *ctx
/* lock name mutex */
- rc = ngx_resolve_name_locked(r, ctx);
+ rc = ngx_resolve_name_locked(r, ctx, &ctx->name);
if (rc == NGX_OK) {
return NGX_OK;
@@ -403,7 +403,6 @@ ngx_resolve_name(ngx_resolver_ctx_t *ctx
void
ngx_resolve_name_done(ngx_resolver_ctx_t *ctx)
{
- uint32_t hash;
ngx_resolver_t *r;
ngx_resolver_ctx_t *w, **p;
ngx_resolver_node_t *rn;
@@ -423,11 +422,9 @@ ngx_resolve_name_done(ngx_resolver_ctx_t
/* lock name mutex */
- if (ctx->state == NGX_AGAIN) {
-
- hash = ngx_crc32_short(ctx->name.data, ctx->name.len);
+ if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) {
- rn = ngx_resolver_lookup_name(r, &ctx->name, hash);
+ rn = ctx->node;
if (rn) {
p = &rn->waiting;
@@ -472,23 +469,28 @@ done:
static ngx_int_t
-ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx)
+ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx,
+ ngx_str_t *name)
{
uint32_t hash;
ngx_int_t rc;
+ ngx_str_t cname;
ngx_uint_t naddrs;
ngx_addr_t *addrs;
- ngx_resolver_ctx_t *next;
+ ngx_resolver_ctx_t *next, *last;
ngx_resolver_node_t *rn;
- ngx_strlow(ctx->name.data, ctx->name.data, ctx->name.len);
+ ngx_strlow(name->data, name->data, name->len);
- hash = ngx_crc32_short(ctx->name.data, ctx->name.len);
+ hash = ngx_crc32_short(name->data, name->len);
- rn = ngx_resolver_lookup_name(r, &ctx->name, hash);
+ rn = ngx_resolver_lookup_name(r, name, hash);
if (rn) {
+ /* ctx can be a list after NGX_RESOLVE_CNAME */
+ for (last = ctx; last->next; last = last->next);
+
if (rn->valid >= ngx_time()) {
ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached");
@@ -516,7 +518,7 @@ ngx_resolve_name_locked(ngx_resolver_t *
}
}
- ctx->next = rn->waiting;
+ last->next = rn->waiting;
rn->waiting = NULL;
/* unlock name mutex */
@@ -556,13 +558,13 @@ ngx_resolve_name_locked(ngx_resolver_t *
if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) {
- ctx->name.len = rn->cnlen;
- ctx->name.data = rn->u.cname;
+ cname.len = rn->cnlen;
+ cname.data = rn->u.cname;
- return ngx_resolve_name_locked(r, ctx);
+ return ngx_resolve_name_locked(r, ctx, &cname);
}
- ctx->next = rn->waiting;
+ last->next = rn->waiting;
rn->waiting = NULL;
/* unlock name mutex */
@@ -581,10 +583,29 @@ ngx_resolve_name_locked(ngx_resolver_t *
if (rn->waiting) {
- ctx->next = rn->waiting;
+ if (ctx->event == NULL) {
+ ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t));
+ if (ctx->event == NULL) {
+ return NGX_ERROR;
+ }
+
+ ctx->event->handler = ngx_resolver_timeout_handler;
+ ctx->event->data = ctx;
+ ctx->event->log = r->log;
+ ctx->ident = -1;
+
+ ngx_add_timer(ctx->event, ctx->timeout);
+ }
+
+ last->next = rn->waiting;
rn->waiting = ctx;
ctx->state = NGX_AGAIN;
+ do {
+ ctx->node = rn;
+ ctx = ctx->next;
+ } while (ctx);
+
return NGX_AGAIN;
}
@@ -623,14 +644,14 @@ ngx_resolve_name_locked(ngx_resolver_t *
return NGX_ERROR;
}
- rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len);
+ rn->name = ngx_resolver_dup(r, name->data, name->len);
if (rn->name == NULL) {
ngx_resolver_free(r, rn);
return NGX_ERROR;
}
rn->node.key = hash;
- rn->nlen = (u_short) ctx->name.len;
+ rn->nlen = (u_short) name->len;
rn->query = NULL;
#if (NGX_HAVE_INET6)
rn->query6 = NULL;
@@ -639,7 +660,7 @@ ngx_resolve_name_locked(ngx_resolver_t *
ngx_rbtree_insert(&r->name_rbtree, &rn->node);
}
- rc = ngx_resolver_create_name_query(rn, ctx);
+ rc = ngx_resolver_create_name_query(r, rn, name);
if (rc == NGX_ERROR) {
goto failed;
@@ -652,8 +673,14 @@ ngx_resolve_name_locked(ngx_resolver_t *
ngx_resolver_free(r, rn->name);
ngx_resolver_free(r, rn);
- ctx->state = NGX_RESOLVE_NXDOMAIN;
- ctx->handler(ctx);
+ do {
+ ctx->state = NGX_RESOLVE_NXDOMAIN;
+ next = ctx->next;
+
+ ctx->handler(ctx);
+
+ ctx = next;
+ } while (ctx);
return NGX_OK;
}
@@ -674,9 +701,9 @@ ngx_resolve_name_locked(ngx_resolver_t *
}
ctx->event->handler = ngx_resolver_timeout_handler;
- ctx->event->data = rn;
+ ctx->event->data = ctx;
ctx->event->log = r->log;
- rn->ident = -1;
+ ctx->ident = -1;
ngx_add_timer(ctx->event, ctx->timeout);
}
@@ -697,6 +724,11 @@ ngx_resolve_name_locked(ngx_resolver_t *
ctx->state = NGX_AGAIN;
+ do {
+ ctx->node = rn;
+ ctx = ctx->next;
+ } while (ctx);
+
return NGX_AGAIN;
failed:
@@ -804,9 +836,22 @@ ngx_resolve_addr(ngx_resolver_ctx_t *ctx
if (rn->waiting) {
+ ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t));
+ if (ctx->event == NULL) {
+ return NGX_ERROR;
+ }
+
+ ctx->event->handler = ngx_resolver_timeout_handler;
+ ctx->event->data = ctx;
+ ctx->event->log = r->log;
+ ctx->ident = -1;
+
+ ngx_add_timer(ctx->event, ctx->timeout);
+
ctx->next = rn->waiting;
rn->waiting = ctx;
ctx->state = NGX_AGAIN;
+ ctx->node = rn;
/* unlock addr mutex */
@@ -848,7 +893,7 @@ ngx_resolve_addr(ngx_resolver_ctx_t *ctx
ngx_rbtree_insert(tree, &rn->node);
}
- if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) {
+ if (ngx_resolver_create_addr_query(r, rn, &ctx->addr) != NGX_OK) {
goto failed;
}
@@ -867,9 +912,9 @@ ngx_resolve_addr(ngx_resolver_ctx_t *ctx
}
ctx->event->handler = ngx_resolver_timeout_handler;
- ctx->event->data = rn;
+ ctx->event->data = ctx;
ctx->event->log = r->log;
- rn->ident = -1;
+ ctx->ident = -1;
ngx_add_timer(ctx->event, ctx->timeout);
@@ -892,6 +937,7 @@ ngx_resolve_addr(ngx_resolver_ctx_t *ctx
/* unlock addr mutex */
ctx->state = NGX_AGAIN;
+ ctx->node = rn;
return NGX_OK;
@@ -922,17 +968,11 @@ failed:
void
ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx)
{
- in_addr_t addr;
ngx_queue_t *expire_queue;
ngx_rbtree_t *tree;
ngx_resolver_t *r;
ngx_resolver_ctx_t *w, **p;
- struct sockaddr_in *sin;
ngx_resolver_node_t *rn;
-#if (NGX_HAVE_INET6)
- uint32_t hash;
- struct sockaddr_in6 *sin6;
-#endif
r = ctx->resolver;
@@ -959,23 +999,9 @@ ngx_resolve_addr_done(ngx_resolver_ctx_t
/* lock addr mutex */
- if (ctx->state == NGX_AGAIN) {
-
- switch (ctx->addr.sockaddr->sa_family) {
-
-#if (NGX_HAVE_INET6)
- case AF_INET6:
- sin6 = (struct sockaddr_in6 *) ctx->addr.sockaddr;
- hash = ngx_crc32_short(sin6->sin6_addr.s6_addr, 16);
- rn = ngx_resolver_lookup_addr6(r, &sin6->sin6_addr, hash);
- break;
-#endif
+ if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) {
- default: /* AF_INET */
- sin = (struct sockaddr_in *) ctx->addr.sockaddr;
- addr = ntohl(sin->sin_addr.s_addr);
- rn = ngx_resolver_lookup_addr(r, addr);
- }
+ rn = ctx->node;
if (rn) {
p = &rn->waiting;
@@ -1312,7 +1338,7 @@ ngx_resolver_process_response(ngx_resolv
times = 0;
for (q = ngx_queue_head(&r->name_resend_queue);
- q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100;
+ q != ngx_queue_sentinel(&r->name_resend_queue) && times++ < 100;
q = ngx_queue_next(q))
{
rn = ngx_queue_data(q, ngx_resolver_node_t, queue);
@@ -1975,20 +2001,39 @@ ngx_resolver_process_a(ngx_resolver_t *r
ngx_queue_insert_head(&r->name_expire_queue, &rn->queue);
+ ngx_resolver_free(r, rn->query);
+ rn->query = NULL;
+#if (NGX_HAVE_INET6)
+ rn->query6 = NULL;
+#endif
+
ctx = rn->waiting;
rn->waiting = NULL;
if (ctx) {
- ctx->name = name;
- (void) ngx_resolve_name_locked(r, ctx);
- }
+ if (ctx->recursion++ >= NGX_RESOLVER_MAX_RECURSION) {
- ngx_resolver_free(r, rn->query);
- rn->query = NULL;
-#if (NGX_HAVE_INET6)
- rn->query6 = NULL;
-#endif
+ /* unlock name mutex */
+
+ do {
+ ctx->state = NGX_RESOLVE_NXDOMAIN;
+ next = ctx->next;
+
+ ctx->handler(ctx);
+
+ ctx = next;
+ } while (ctx);
+
+ return;
+ }
+
+ for (next = ctx; next; next = next->next) {
+ next->node = NULL;
+ }
+
+ (void) ngx_resolve_name_locked(r, ctx, &name);
+ }
/* unlock name mutex */
@@ -2496,27 +2541,23 @@ ngx_resolver_rbtree_insert_addr6_value(n
static ngx_int_t
-ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
+ngx_resolver_create_name_query(ngx_resolver_t *r, ngx_resolver_node_t *rn,
+ ngx_str_t *name)
{
u_char *p, *s;
size_t len, nlen;
ngx_uint_t ident;
-#if (NGX_HAVE_INET6)
- ngx_resolver_t *r;
-#endif
ngx_resolver_qs_t *qs;
ngx_resolver_hdr_t *query;
- nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1;
+ nlen = name->len ? (1 + name->len + 1) : 1;
len = sizeof(ngx_resolver_hdr_t) + nlen + sizeof(ngx_resolver_qs_t);
#if (NGX_HAVE_INET6)
- r = ctx->resolver;
-
- p = ngx_resolver_alloc(ctx->resolver, r->ipv6 ? len * 2 : len);
+ p = ngx_resolver_alloc(r, r->ipv6 ? len * 2 : len);
#else
- p = ngx_resolver_alloc(ctx->resolver, len);
+ p = ngx_resolver_alloc(r, len);
#endif
if (p == NULL) {
return NGX_ERROR;
@@ -2535,8 +2576,8 @@ ngx_resolver_create_name_query(ngx_resol
ident = ngx_random();
- ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0,
- "resolve: \"%V\" A %i", &ctx->name, ident & 0xffff);
+ ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
+ "resolve: \"%V\" A %i", name, ident & 0xffff);
query->ident_hi = (u_char) ((ident >> 8) & 0xff);
query->ident_lo = (u_char) (ident & 0xff);
@@ -2566,11 +2607,11 @@ ngx_resolver_create_name_query(ngx_resol
p--;
*p-- = '\0';
- if (ctx->name.len == 0) {
+ if (name->len == 0) {
return NGX_DECLINED;
}
- for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) {
+ for (s = name->data + name->len - 1; s >= name->data; s--) {
if (*s != '.') {
*p = *s;
len++;
@@ -2606,8 +2647,8 @@ ngx_resolver_create_name_query(ngx_resol
ident = ngx_random();
- ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0,
- "resolve: \"%V\" AAAA %i", &ctx->name, ident & 0xffff);
+ ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
+ "resolve: \"%V\" AAAA %i", name, ident & 0xffff);
query->ident_hi = (u_char) ((ident >> 8) & 0xff);
query->ident_lo = (u_char) (ident & 0xff);
@@ -2624,11 +2665,12 @@ ngx_resolver_create_name_query(ngx_resol
static ngx_int_t
-ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx)
+ngx_resolver_create_addr_query(ngx_resolver_t *r, ngx_resolver_node_t *rn,
+ ngx_addr_t *addr)
{
u_char *p, *d;
size_t len;
- in_addr_t addr;
+ in_addr_t inaddr;
ngx_int_t n;
ngx_uint_t ident;
ngx_resolver_hdr_t *query;
@@ -2637,7 +2679,7 @@ ngx_resolver_create_addr_query(ngx_resol
struct sockaddr_in6 *sin6;
#endif
- switch (ctx->addr.sockaddr->sa_family) {
+ switch (addr->sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
@@ -2654,7 +2696,7 @@ ngx_resolver_create_addr_query(ngx_resol
+ sizeof(ngx_resolver_qs_t);
}
- p = ngx_resolver_alloc(ctx->resolver, len);
+ p = ngx_resolver_alloc(r, len);
if (p == NULL) {
return NGX_ERROR;
}
@@ -2678,11 +2720,11 @@ ngx_resolver_create_addr_query(ngx_resol
p += sizeof(ngx_resolver_hdr_t);
- switch (ctx->addr.sockaddr->sa_family) {
+ switch (addr->sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
- sin6 = (struct sockaddr_in6 *) ctx->addr.sockaddr;
+ sin6 = (struct sockaddr_in6 *) addr->sockaddr;
for (n = 15; n >= 0; n--) {
p = ngx_sprintf(p, "\1%xd\1%xd",
@@ -2697,11 +2739,11 @@ ngx_resolver_create_addr_query(ngx_resol
default: /* AF_INET */
- sin = (struct sockaddr_in *) ctx->addr.sockaddr;
- addr = ntohl(sin->sin_addr.s_addr);
+ sin = (struct sockaddr_in *) addr->sockaddr;
+ inaddr = ntohl(sin->sin_addr.s_addr);
for (n = 0; n < 32; n += 8) {
- d = ngx_sprintf(&p[1], "%ud", (addr >> n) & 0xff);
+ d = ngx_sprintf(&p[1], "%ud", (inaddr >> n) & 0xff);
*p = (u_char) (d - &p[1]);
p = d;
}
@@ -2815,21 +2857,13 @@ done:
static void
ngx_resolver_timeout_handler(ngx_event_t *ev)
{
- ngx_resolver_ctx_t *ctx, *next;
- ngx_resolver_node_t *rn;
+ ngx_resolver_ctx_t *ctx;
- rn = ev->data;
- ctx = rn->waiting;
- rn->waiting = NULL;
+ ctx = ev->data;
- do {
- ctx->state = NGX_RESOLVE_TIMEDOUT;
- next = ctx->next;
-
- ctx->handler(ctx);
+ ctx->state = NGX_RESOLVE_TIMEDOUT;
- ctx = next;
- } while (ctx);
+ ctx->handler(ctx);
}
diff -upr nginx-1.9.7-old/src/core/ngx_resolver.h nginx-1.9.7/src/core/ngx_resolver.h
--- nginx-1.9.7-old/src/core/ngx_resolver.h 2016-01-26 11:54:55.914404751 -0800
+++ nginx-1.9.7/src/core/ngx_resolver.h 2016-01-26 11:55:27.068784001 -0800
@@ -51,15 +51,11 @@ typedef void (*ngx_resolver_handler_pt)(
typedef struct {
- /* PTR: resolved name, A: name to resolve */
- u_char *name;
-
+ ngx_rbtree_node_t node;
ngx_queue_t queue;
- /* event ident must be after 3 pointers as in ngx_connection_t */
- ngx_int_t ident;
-
- ngx_rbtree_node_t node;
+ /* PTR: resolved name, A: name to resolve */
+ u_char *name;
#if (NGX_HAVE_INET6)
/* PTR: IPv6 address to resolve (IPv4 address is in rbtree node key) */
@@ -147,6 +143,9 @@ struct ngx_resolver_ctx_s {
ngx_resolver_t *resolver;
ngx_udp_connection_t *udp_connection;
+ /* event ident must be after 3 pointers as in ngx_connection_t */
+ ngx_int_t ident;
+
ngx_int_t state;
ngx_str_t name;
@@ -162,6 +161,8 @@ struct ngx_resolver_ctx_s {
ngx_uint_t quick; /* unsigned quick:1; */
ngx_uint_t recursion;
ngx_event_t *event;
+
+ ngx_resolver_node_t *node;
};
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