diff options
Diffstat (limited to 'libxcb/src')
| -rw-r--r-- | libxcb/src/xcb_auth.c | 725 |
1 files changed, 364 insertions, 361 deletions
diff --git a/libxcb/src/xcb_auth.c b/libxcb/src/xcb_auth.c index 967ba283a..a3a7e45b5 100644 --- a/libxcb/src/xcb_auth.c +++ b/libxcb/src/xcb_auth.c @@ -1,361 +1,364 @@ -/* 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)
- {
- free(sockname);
-
- if ((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); + + 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) + { + struct sockaddr *new_sockname = NULL; + socknamelen = actual_socknamelen; + + if ((new_sockname = realloc(sockname, actual_socknamelen)) == NULL) + goto sock_or_realloc_error; + + sockname = new_sockname; + + if (socket_func(fd, sockname, &actual_socknamelen) == -1 || + actual_socknamelen > socknamelen) + goto sock_or_realloc_error; + } + + 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) + { + free(sockname); + + if ((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; +} |