diff options
Diffstat (limited to 'libxcb/src/xcb_auth.c')
| -rw-r--r-- | libxcb/src/xcb_auth.c | 707 |
1 files changed, 356 insertions, 351 deletions
diff --git a/libxcb/src/xcb_auth.c b/libxcb/src/xcb_auth.c index d774d1069..e60cb5f98 100644 --- a/libxcb/src/xcb_auth.c +++ b/libxcb/src/xcb_auth.c @@ -1,351 +1,356 @@ -/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp. - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the "Software"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN - * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - * - * Except as contained in this notice, the names of the authors or their - * institutions shall not be used in advertising or otherwise to promote the - * sale, use or other dealings in this Software without prior written - * authorization from the authors. - */ - -/* Authorization systems for the X protocol. */ - -#include <assert.h> -#include <X11/Xauth.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <sys/un.h> -#include <sys/param.h> -#include <unistd.h> -#include <stdlib.h> - -#include "xcb.h" -#include "xcbint.h" - -#ifdef HASXDMAUTH -#include <X11/Xdmcp.h> -#endif - -enum auth_protos { -#ifdef HASXDMAUTH - AUTH_XA1, -#endif - AUTH_MC1, - N_AUTH_PROTOS -}; - -#define AUTH_PROTO_XDM_AUTHORIZATION "XDM-AUTHORIZATION-1" -#define AUTH_PROTO_MIT_MAGIC_COOKIE "MIT-MAGIC-COOKIE-1" - -static char *authnames[N_AUTH_PROTOS] = { -#ifdef HASXDMAUTH - AUTH_PROTO_XDM_AUTHORIZATION, -#endif - AUTH_PROTO_MIT_MAGIC_COOKIE, -}; - -static int authnameslen[N_AUTH_PROTOS] = { -#ifdef HASXDMAUTH - sizeof(AUTH_PROTO_XDM_AUTHORIZATION) - 1, -#endif - sizeof(AUTH_PROTO_MIT_MAGIC_COOKIE) - 1, -}; - -static size_t memdup(char **dst, void *src, size_t len) -{ - if(len) - *dst = malloc(len); - else - *dst = 0; - if(!*dst) - return 0; - memcpy(*dst, src, len); - return len; -} - -static int authname_match(enum auth_protos kind, char *name, size_t namelen) -{ - if(authnameslen[kind] != namelen) - return 0; - if(memcmp(authnames[kind], name, namelen)) - return 0; - return 1; -} - -#define SIN6_ADDR(s) (&((struct sockaddr_in6 *)s)->sin6_addr) - -static Xauth *get_authptr(struct sockaddr *sockname, int display) -{ - char *addr = 0; - int addrlen = 0; - unsigned short family; - char hostnamebuf[256]; /* big enough for max hostname */ - char dispbuf[40]; /* big enough to hold more than 2^64 base 10 */ - int dispbuflen; - - family = FamilyLocal; /* 256 */ - switch(sockname->sa_family) - { -#ifdef AF_INET6 - case AF_INET6: - addr = (char *) SIN6_ADDR(sockname); - addrlen = sizeof(*SIN6_ADDR(sockname)); - if(!IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname))) - { - if(!IN6_IS_ADDR_LOOPBACK(SIN6_ADDR(sockname))) - family = XCB_FAMILY_INTERNET_6; - break; - } - addr += 12; - /* if v4-mapped, fall through. */ -#endif - case AF_INET: - if(!addr) - addr = (char *) &((struct sockaddr_in *)sockname)->sin_addr; - addrlen = sizeof(((struct sockaddr_in *)sockname)->sin_addr); - if(*(in_addr_t *) addr != htonl(INADDR_LOOPBACK)) - family = XCB_FAMILY_INTERNET; - break; - case AF_UNIX: - break; - default: - return 0; /* cannot authenticate this family */ - } - - dispbuflen = snprintf(dispbuf, sizeof(dispbuf), "%d", display); - if(dispbuflen < 0) - return 0; - /* snprintf may have truncate our text */ - dispbuflen = MIN(dispbuflen, sizeof(dispbuf) - 1); - - if (family == FamilyLocal) { - if (gethostname(hostnamebuf, sizeof(hostnamebuf)) == -1) - return 0; /* do not know own hostname */ - addr = hostnamebuf; - addrlen = strlen(addr); - } - - return XauGetBestAuthByAddr (family, - (unsigned short) addrlen, addr, - (unsigned short) dispbuflen, dispbuf, - N_AUTH_PROTOS, authnames, authnameslen); -} - -#ifdef HASXDMAUTH -static int next_nonce(void) -{ - static int nonce = 0; - static pthread_mutex_t nonce_mutex = PTHREAD_MUTEX_INITIALIZER; - int ret; - pthread_mutex_lock(&nonce_mutex); - ret = nonce++; - pthread_mutex_unlock(&nonce_mutex); - return ret; -} - -static void do_append(char *buf, int *idxp, void *val, size_t valsize) { - memcpy(buf + *idxp, val, valsize); - *idxp += valsize; -} -#endif - -static int compute_auth(xcb_auth_info_t *info, Xauth *authptr, struct sockaddr *sockname) -{ - if (authname_match(AUTH_MC1, authptr->name, authptr->name_length)) { - info->datalen = memdup(&info->data, authptr->data, authptr->data_length); - if(!info->datalen) - return 0; - return 1; - } -#ifdef HASXDMAUTH -#define APPEND(buf,idx,val) do_append((buf),&(idx),&(val),sizeof(val)) - if (authname_match(AUTH_XA1, authptr->name, authptr->name_length)) { - int j; - - info->data = malloc(192 / 8); - if(!info->data) - return 0; - - for (j = 0; j < 8; j++) - info->data[j] = authptr->data[j]; - switch(sockname->sa_family) { - case AF_INET: - /*block*/ { - struct sockaddr_in *si = (struct sockaddr_in *) sockname; - APPEND(info->data, j, si->sin_addr.s_addr); - APPEND(info->data, j, si->sin_port); - } - break; -#ifdef AF_INET6 - case AF_INET6: - /*block*/ { - struct sockaddr_in6 *si6 = (struct sockaddr_in6 *) sockname; - if(IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname))) - { - do_append(info->data, &j, &si6->sin6_addr.s6_addr[12], 4); - APPEND(info->data, j, si6->sin6_port); - } - else - { - /* XDM-AUTHORIZATION-1 does not handle IPv6 correctly. Do the - same thing Xlib does: use all zeroes for the 4-byte address - and 2-byte port number. */ - uint32_t fakeaddr = 0; - uint16_t fakeport = 0; - APPEND(info->data, j, fakeaddr); - APPEND(info->data, j, fakeport); - } - } - break; -#endif - case AF_UNIX: - /*block*/ { - uint32_t fakeaddr = htonl(0xffffffff - next_nonce()); - uint16_t fakeport = htons(getpid()); - APPEND(info->data, j, fakeaddr); - APPEND(info->data, j, fakeport); - } - break; - default: - free(info->data); - return 0; /* do not know how to build this */ - } - { - uint32_t now = htonl(time(0)); - APPEND(info->data, j, now); - } - assert(j <= 192 / 8); - while (j < 192 / 8) - info->data[j++] = 0; - info->datalen = j; - XdmcpWrap ((unsigned char *) info->data, (unsigned char *) authptr->data + 8, (unsigned char *) info->data, info->datalen); - return 1; - } -#undef APPEND -#endif - - return 0; /* Unknown authorization type */ -} - -/* `sockaddr_un.sun_path' typical size usually ranges between 92 and 108 */ -#define INITIAL_SOCKNAME_SLACK 108 - -/* Return a dynamically allocated socket address structure according - to the value returned by either getpeername() or getsockname() - (according to POSIX, applications should not assume a particular - length for `sockaddr_un.sun_path') */ -static struct sockaddr *get_peer_sock_name(int (*socket_func)(int, - struct sockaddr *, - socklen_t *), - int fd) -{ - socklen_t socknamelen = sizeof(struct sockaddr) + INITIAL_SOCKNAME_SLACK; - socklen_t actual_socknamelen = socknamelen; - struct sockaddr *sockname = malloc(socknamelen), *new_sockname = NULL; - - if (sockname == NULL) - return NULL; - - /* Both getpeername() and getsockname() truncates sockname if - there is not enough space and set the required length in - actual_socknamelen */ - if (socket_func(fd, sockname, &actual_socknamelen) == -1) - goto sock_or_realloc_error; - - if (actual_socknamelen > socknamelen) - { - socknamelen = actual_socknamelen; - - if ((new_sockname = realloc(sockname, actual_socknamelen)) == NULL || - socket_func(fd, new_sockname, &actual_socknamelen) == -1 || - actual_socknamelen > socknamelen) - goto sock_or_realloc_error; - - sockname = new_sockname; - } - - return sockname; - - sock_or_realloc_error: - free(sockname); - return NULL; -} - -int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display) -{ - /* code adapted from Xlib/ConnDis.c, xtrans/Xtranssocket.c, - xtrans/Xtransutils.c */ - struct sockaddr *sockname = NULL; - int gotsockname = 0; - Xauth *authptr = 0; - int ret = 1; - - /* Some systems like hpux or Hurd do not expose peer names - * for UNIX Domain Sockets, but this is irrelevant, - * since compute_auth() ignores the peer name in this - * case anyway.*/ - if ((sockname = get_peer_sock_name(getpeername, fd)) == NULL) - { - if ((sockname = get_peer_sock_name(getsockname, fd)) == NULL) - return 0; /* can only authenticate sockets */ - if (sockname->sa_family != AF_UNIX) - { - free(sockname); - return 0; /* except for AF_UNIX, sockets should have peernames */ - } - gotsockname = 1; - } - - authptr = get_authptr(sockname, display); - if (authptr == 0) - { - free(sockname); - return 0; /* cannot find good auth data */ - } - - info->namelen = memdup(&info->name, authptr->name, authptr->name_length); - if (!info->namelen) - goto no_auth; /* out of memory */ - - if (!gotsockname && (sockname = get_peer_sock_name(getsockname, fd)) == NULL) - { - free(info->name); - goto no_auth; /* can only authenticate sockets */ - } - - ret = compute_auth(info, authptr, sockname); - if(!ret) - { - free(info->name); - goto no_auth; /* cannot build auth record */ - } - - free(sockname); - sockname = NULL; - - XauDisposeAuth(authptr); - return ret; - - no_auth: - free(sockname); - - info->name = 0; - info->namelen = 0; - XauDisposeAuth(authptr); - return 0; -} +/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the names of the authors or their
+ * institutions shall not be used in advertising or otherwise to promote the
+ * sale, use or other dealings in this Software without prior written
+ * authorization from the authors.
+ */
+
+/* Authorization systems for the X protocol. */
+
+#include <assert.h>
+#include <X11/Xauth.h>
+#include <sys/param.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#ifdef _WIN32
+#include "xcb_windefs.h"
+#else
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <sys/un.h>
+#endif /* _WIN32 */
+
+#include "xcb.h"
+#include "xcbint.h"
+
+#ifdef HASXDMAUTH
+#include <X11/Xdmcp.h>
+#endif
+
+enum auth_protos {
+#ifdef HASXDMAUTH
+ AUTH_XA1,
+#endif
+ AUTH_MC1,
+ N_AUTH_PROTOS
+};
+
+#define AUTH_PROTO_XDM_AUTHORIZATION "XDM-AUTHORIZATION-1"
+#define AUTH_PROTO_MIT_MAGIC_COOKIE "MIT-MAGIC-COOKIE-1"
+
+static char *authnames[N_AUTH_PROTOS] = {
+#ifdef HASXDMAUTH
+ AUTH_PROTO_XDM_AUTHORIZATION,
+#endif
+ AUTH_PROTO_MIT_MAGIC_COOKIE,
+};
+
+static int authnameslen[N_AUTH_PROTOS] = {
+#ifdef HASXDMAUTH
+ sizeof(AUTH_PROTO_XDM_AUTHORIZATION) - 1,
+#endif
+ sizeof(AUTH_PROTO_MIT_MAGIC_COOKIE) - 1,
+};
+
+static size_t memdup(char **dst, void *src, size_t len)
+{
+ if(len)
+ *dst = malloc(len);
+ else
+ *dst = 0;
+ if(!*dst)
+ return 0;
+ memcpy(*dst, src, len);
+ return len;
+}
+
+static int authname_match(enum auth_protos kind, char *name, size_t namelen)
+{
+ if(authnameslen[kind] != namelen)
+ return 0;
+ if(memcmp(authnames[kind], name, namelen))
+ return 0;
+ return 1;
+}
+
+#define SIN6_ADDR(s) (&((struct sockaddr_in6 *)s)->sin6_addr)
+
+static Xauth *get_authptr(struct sockaddr *sockname, int display)
+{
+ char *addr = 0;
+ int addrlen = 0;
+ unsigned short family;
+ char hostnamebuf[256]; /* big enough for max hostname */
+ char dispbuf[40]; /* big enough to hold more than 2^64 base 10 */
+ int dispbuflen;
+
+ family = FamilyLocal; /* 256 */
+ switch(sockname->sa_family)
+ {
+#ifdef AF_INET6
+ case AF_INET6:
+ addr = (char *) SIN6_ADDR(sockname);
+ addrlen = sizeof(*SIN6_ADDR(sockname));
+ if(!IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
+ {
+ if(!IN6_IS_ADDR_LOOPBACK(SIN6_ADDR(sockname)))
+ family = XCB_FAMILY_INTERNET_6;
+ break;
+ }
+ addr += 12;
+ /* if v4-mapped, fall through. */
+#endif
+ case AF_INET:
+ if(!addr)
+ addr = (char *) &((struct sockaddr_in *)sockname)->sin_addr;
+ addrlen = sizeof(((struct sockaddr_in *)sockname)->sin_addr);
+ if(*(in_addr_t *) addr != htonl(INADDR_LOOPBACK))
+ family = XCB_FAMILY_INTERNET;
+ break;
+ case AF_UNIX:
+ break;
+ default:
+ return 0; /* cannot authenticate this family */
+ }
+
+ dispbuflen = snprintf(dispbuf, sizeof(dispbuf), "%d", display);
+ if(dispbuflen < 0)
+ return 0;
+ /* snprintf may have truncate our text */
+ dispbuflen = MIN(dispbuflen, sizeof(dispbuf) - 1);
+
+ if (family == FamilyLocal) {
+ if (gethostname(hostnamebuf, sizeof(hostnamebuf)) == -1)
+ return 0; /* do not know own hostname */
+ addr = hostnamebuf;
+ addrlen = strlen(addr);
+ }
+
+ return XauGetBestAuthByAddr (family,
+ (unsigned short) addrlen, addr,
+ (unsigned short) dispbuflen, dispbuf,
+ N_AUTH_PROTOS, authnames, authnameslen);
+}
+
+#ifdef HASXDMAUTH
+static int next_nonce(void)
+{
+ static int nonce = 0;
+ static pthread_mutex_t nonce_mutex = PTHREAD_MUTEX_INITIALIZER;
+ int ret;
+ pthread_mutex_lock(&nonce_mutex);
+ ret = nonce++;
+ pthread_mutex_unlock(&nonce_mutex);
+ return ret;
+}
+
+static void do_append(char *buf, int *idxp, void *val, size_t valsize) {
+ memcpy(buf + *idxp, val, valsize);
+ *idxp += valsize;
+}
+#endif
+
+static int compute_auth(xcb_auth_info_t *info, Xauth *authptr, struct sockaddr *sockname)
+{
+ if (authname_match(AUTH_MC1, authptr->name, authptr->name_length)) {
+ info->datalen = memdup(&info->data, authptr->data, authptr->data_length);
+ if(!info->datalen)
+ return 0;
+ return 1;
+ }
+#ifdef HASXDMAUTH
+#define APPEND(buf,idx,val) do_append((buf),&(idx),&(val),sizeof(val))
+ if (authname_match(AUTH_XA1, authptr->name, authptr->name_length)) {
+ int j;
+
+ info->data = malloc(192 / 8);
+ if(!info->data)
+ return 0;
+
+ for (j = 0; j < 8; j++)
+ info->data[j] = authptr->data[j];
+ switch(sockname->sa_family) {
+ case AF_INET:
+ /*block*/ {
+ struct sockaddr_in *si = (struct sockaddr_in *) sockname;
+ APPEND(info->data, j, si->sin_addr.s_addr);
+ APPEND(info->data, j, si->sin_port);
+ }
+ break;
+#ifdef AF_INET6
+ case AF_INET6:
+ /*block*/ {
+ struct sockaddr_in6 *si6 = (struct sockaddr_in6 *) sockname;
+ if(IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
+ {
+ do_append(info->data, &j, &si6->sin6_addr.s6_addr[12], 4);
+ APPEND(info->data, j, si6->sin6_port);
+ }
+ else
+ {
+ /* XDM-AUTHORIZATION-1 does not handle IPv6 correctly. Do the
+ same thing Xlib does: use all zeroes for the 4-byte address
+ and 2-byte port number. */
+ uint32_t fakeaddr = 0;
+ uint16_t fakeport = 0;
+ APPEND(info->data, j, fakeaddr);
+ APPEND(info->data, j, fakeport);
+ }
+ }
+ break;
+#endif
+ case AF_UNIX:
+ /*block*/ {
+ uint32_t fakeaddr = htonl(0xffffffff - next_nonce());
+ uint16_t fakeport = htons(getpid());
+ APPEND(info->data, j, fakeaddr);
+ APPEND(info->data, j, fakeport);
+ }
+ break;
+ default:
+ free(info->data);
+ return 0; /* do not know how to build this */
+ }
+ {
+ uint32_t now = htonl(time(0));
+ APPEND(info->data, j, now);
+ }
+ assert(j <= 192 / 8);
+ while (j < 192 / 8)
+ info->data[j++] = 0;
+ info->datalen = j;
+ XdmcpWrap ((unsigned char *) info->data, (unsigned char *) authptr->data + 8, (unsigned char *) info->data, info->datalen);
+ return 1;
+ }
+#undef APPEND
+#endif
+
+ return 0; /* Unknown authorization type */
+}
+
+/* `sockaddr_un.sun_path' typical size usually ranges between 92 and 108 */
+#define INITIAL_SOCKNAME_SLACK 108
+
+/* Return a dynamically allocated socket address structure according
+ to the value returned by either getpeername() or getsockname()
+ (according to POSIX, applications should not assume a particular
+ length for `sockaddr_un.sun_path') */
+static struct sockaddr *get_peer_sock_name(int (*socket_func)(int,
+ struct sockaddr *,
+ socklen_t *),
+ int fd)
+{
+ socklen_t socknamelen = sizeof(struct sockaddr) + INITIAL_SOCKNAME_SLACK;
+ socklen_t actual_socknamelen = socknamelen;
+ struct sockaddr *sockname = malloc(socknamelen), *new_sockname = NULL;
+
+ if (sockname == NULL)
+ return NULL;
+
+ /* Both getpeername() and getsockname() truncates sockname if
+ there is not enough space and set the required length in
+ actual_socknamelen */
+ if (socket_func(fd, sockname, &actual_socknamelen) == -1)
+ goto sock_or_realloc_error;
+
+ if (actual_socknamelen > socknamelen)
+ {
+ socknamelen = actual_socknamelen;
+
+ if ((new_sockname = realloc(sockname, actual_socknamelen)) == NULL ||
+ socket_func(fd, new_sockname, &actual_socknamelen) == -1 ||
+ actual_socknamelen > socknamelen)
+ goto sock_or_realloc_error;
+
+ sockname = new_sockname;
+ }
+
+ return sockname;
+
+ sock_or_realloc_error:
+ free(sockname);
+ return NULL;
+}
+
+int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display)
+{
+ /* code adapted from Xlib/ConnDis.c, xtrans/Xtranssocket.c,
+ xtrans/Xtransutils.c */
+ struct sockaddr *sockname = NULL;
+ int gotsockname = 0;
+ Xauth *authptr = 0;
+ int ret = 1;
+
+ /* Some systems like hpux or Hurd do not expose peer names
+ * for UNIX Domain Sockets, but this is irrelevant,
+ * since compute_auth() ignores the peer name in this
+ * case anyway.*/
+ if ((sockname = get_peer_sock_name(getpeername, fd)) == NULL)
+ {
+ if ((sockname = get_peer_sock_name(getsockname, fd)) == NULL)
+ return 0; /* can only authenticate sockets */
+ if (sockname->sa_family != AF_UNIX)
+ {
+ free(sockname);
+ return 0; /* except for AF_UNIX, sockets should have peernames */
+ }
+ gotsockname = 1;
+ }
+
+ authptr = get_authptr(sockname, display);
+ if (authptr == 0)
+ {
+ free(sockname);
+ return 0; /* cannot find good auth data */
+ }
+
+ info->namelen = memdup(&info->name, authptr->name, authptr->name_length);
+ if (!info->namelen)
+ goto no_auth; /* out of memory */
+
+ if (!gotsockname && (sockname = get_peer_sock_name(getsockname, fd)) == NULL)
+ {
+ free(info->name);
+ goto no_auth; /* can only authenticate sockets */
+ }
+
+ ret = compute_auth(info, authptr, sockname);
+ if(!ret)
+ {
+ free(info->name);
+ goto no_auth; /* cannot build auth record */
+ }
+
+ free(sockname);
+ sockname = NULL;
+
+ XauDisposeAuth(authptr);
+ return ret;
+
+ no_auth:
+ free(sockname);
+
+ info->name = 0;
+ info->namelen = 0;
+ XauDisposeAuth(authptr);
+ return 0;
+}
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