| /* $OpenBSD: misc.c,v 1.140 2019/08/16 06:13:15 djm Exp $ */ |
| /* |
| * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| * Copyright (c) 2005,2006 Damien Miller. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "includes.h" |
| |
| #include <sys/types.h> |
| #include <sys/ioctl.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/wait.h> |
| #include <sys/un.h> |
| |
| #include <limits.h> |
| #ifdef HAVE_LIBGEN_H |
| # include <libgen.h> |
| #endif |
| #include <poll.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include <netinet/in.h> |
| #include <netinet/in_systm.h> |
| #include <netinet/ip.h> |
| #include <netinet/tcp.h> |
| #include <arpa/inet.h> |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <netdb.h> |
| #ifdef HAVE_PATHS_H |
| # include <paths.h> |
| #include <pwd.h> |
| #endif |
| #ifdef SSH_TUN_OPENBSD |
| #include <net/if.h> |
| #endif |
| |
| #include "xmalloc.h" |
| #include "misc.h" |
| #include "log.h" |
| #include "ssh.h" |
| #include "sshbuf.h" |
| #include "ssherr.h" |
| #include "platform.h" |
| |
| /* remove newline at end of string */ |
| char * |
| chop(char *s) |
| { |
| char *t = s; |
| while (*t) { |
| if (*t == '\n' || *t == '\r') { |
| *t = '\0'; |
| return s; |
| } |
| t++; |
| } |
| return s; |
| |
| } |
| |
| /* set/unset filedescriptor to non-blocking */ |
| int |
| set_nonblock(int fd) |
| { |
| int val; |
| |
| val = fcntl(fd, F_GETFL); |
| if (val == -1) { |
| error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); |
| return (-1); |
| } |
| if (val & O_NONBLOCK) { |
| debug3("fd %d is O_NONBLOCK", fd); |
| return (0); |
| } |
| debug2("fd %d setting O_NONBLOCK", fd); |
| val |= O_NONBLOCK; |
| if (fcntl(fd, F_SETFL, val) == -1) { |
| debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, |
| strerror(errno)); |
| return (-1); |
| } |
| return (0); |
| } |
| |
| int |
| unset_nonblock(int fd) |
| { |
| int val; |
| |
| val = fcntl(fd, F_GETFL); |
| if (val == -1) { |
| error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); |
| return (-1); |
| } |
| if (!(val & O_NONBLOCK)) { |
| debug3("fd %d is not O_NONBLOCK", fd); |
| return (0); |
| } |
| debug("fd %d clearing O_NONBLOCK", fd); |
| val &= ~O_NONBLOCK; |
| if (fcntl(fd, F_SETFL, val) == -1) { |
| debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", |
| fd, strerror(errno)); |
| return (-1); |
| } |
| return (0); |
| } |
| |
| const char * |
| ssh_gai_strerror(int gaierr) |
| { |
| if (gaierr == EAI_SYSTEM && errno != 0) |
| return strerror(errno); |
| return gai_strerror(gaierr); |
| } |
| |
| /* disable nagle on socket */ |
| void |
| set_nodelay(int fd) |
| { |
| int opt; |
| socklen_t optlen; |
| |
| optlen = sizeof opt; |
| if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { |
| debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
| return; |
| } |
| if (opt == 1) { |
| debug2("fd %d is TCP_NODELAY", fd); |
| return; |
| } |
| opt = 1; |
| debug2("fd %d setting TCP_NODELAY", fd); |
| if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) |
| error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); |
| } |
| |
| /* Allow local port reuse in TIME_WAIT */ |
| int |
| set_reuseaddr(int fd) |
| { |
| int on = 1; |
| |
| if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) { |
| error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); |
| return -1; |
| } |
| return 0; |
| } |
| |
| /* Get/set routing domain */ |
| char * |
| get_rdomain(int fd) |
| { |
| #if defined(HAVE_SYS_GET_RDOMAIN) |
| return sys_get_rdomain(fd); |
| #elif defined(__OpenBSD__) |
| int rtable; |
| char *ret; |
| socklen_t len = sizeof(rtable); |
| |
| if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) { |
| error("Failed to get routing domain for fd %d: %s", |
| fd, strerror(errno)); |
| return NULL; |
| } |
| xasprintf(&ret, "%d", rtable); |
| return ret; |
| #else /* defined(__OpenBSD__) */ |
| return NULL; |
| #endif |
| } |
| |
| int |
| set_rdomain(int fd, const char *name) |
| { |
| #if defined(HAVE_SYS_SET_RDOMAIN) |
| return sys_set_rdomain(fd, name); |
| #elif defined(__OpenBSD__) |
| int rtable; |
| const char *errstr; |
| |
| if (name == NULL) |
| return 0; /* default table */ |
| |
| rtable = (int)strtonum(name, 0, 255, &errstr); |
| if (errstr != NULL) { |
| /* Shouldn't happen */ |
| error("Invalid routing domain \"%s\": %s", name, errstr); |
| return -1; |
| } |
| if (setsockopt(fd, SOL_SOCKET, SO_RTABLE, |
| &rtable, sizeof(rtable)) == -1) { |
| error("Failed to set routing domain %d on fd %d: %s", |
| rtable, fd, strerror(errno)); |
| return -1; |
| } |
| return 0; |
| #else /* defined(__OpenBSD__) */ |
| error("Setting routing domain is not supported on this platform"); |
| return -1; |
| #endif |
| } |
| |
| /* |
| * Wait up to *timeoutp milliseconds for fd to be readable. Updates |
| * *timeoutp with time remaining. |
| * Returns 0 if fd ready or -1 on timeout or error (see errno). |
| */ |
| int |
| waitrfd(int fd, int *timeoutp) |
| { |
| struct pollfd pfd; |
| struct timeval t_start; |
| int oerrno, r; |
| |
| monotime_tv(&t_start); |
| pfd.fd = fd; |
| pfd.events = POLLIN; |
| for (; *timeoutp >= 0;) { |
| r = poll(&pfd, 1, *timeoutp); |
| oerrno = errno; |
| ms_subtract_diff(&t_start, timeoutp); |
| errno = oerrno; |
| if (r > 0) |
| return 0; |
| else if (r == -1 && errno != EAGAIN) |
| return -1; |
| else if (r == 0) |
| break; |
| } |
| /* timeout */ |
| errno = ETIMEDOUT; |
| return -1; |
| } |
| |
| /* |
| * Attempt a non-blocking connect(2) to the specified address, waiting up to |
| * *timeoutp milliseconds for the connection to complete. If the timeout is |
| * <=0, then wait indefinitely. |
| * |
| * Returns 0 on success or -1 on failure. |
| */ |
| int |
| timeout_connect(int sockfd, const struct sockaddr *serv_addr, |
| socklen_t addrlen, int *timeoutp) |
| { |
| int optval = 0; |
| socklen_t optlen = sizeof(optval); |
| |
| /* No timeout: just do a blocking connect() */ |
| if (timeoutp == NULL || *timeoutp <= 0) |
| return connect(sockfd, serv_addr, addrlen); |
| |
| set_nonblock(sockfd); |
| if (connect(sockfd, serv_addr, addrlen) == 0) { |
| /* Succeeded already? */ |
| unset_nonblock(sockfd); |
| return 0; |
| } else if (errno != EINPROGRESS) |
| return -1; |
| |
| if (waitrfd(sockfd, timeoutp) == -1) |
| return -1; |
| |
| /* Completed or failed */ |
| if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) { |
| debug("getsockopt: %s", strerror(errno)); |
| return -1; |
| } |
| if (optval != 0) { |
| errno = optval; |
| return -1; |
| } |
| unset_nonblock(sockfd); |
| return 0; |
| } |
| |
| /* Characters considered whitespace in strsep calls. */ |
| #define WHITESPACE " \t\r\n" |
| #define QUOTE "\"" |
| |
| /* return next token in configuration line */ |
| static char * |
| strdelim_internal(char **s, int split_equals) |
| { |
| char *old; |
| int wspace = 0; |
| |
| if (*s == NULL) |
| return NULL; |
| |
| old = *s; |
| |
| *s = strpbrk(*s, |
| split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE); |
| if (*s == NULL) |
| return (old); |
| |
| if (*s[0] == '\"') { |
| memmove(*s, *s + 1, strlen(*s)); /* move nul too */ |
| /* Find matching quote */ |
| if ((*s = strpbrk(*s, QUOTE)) == NULL) { |
| return (NULL); /* no matching quote */ |
| } else { |
| *s[0] = '\0'; |
| *s += strspn(*s + 1, WHITESPACE) + 1; |
| return (old); |
| } |
| } |
| |
| /* Allow only one '=' to be skipped */ |
| if (split_equals && *s[0] == '=') |
| wspace = 1; |
| *s[0] = '\0'; |
| |
| /* Skip any extra whitespace after first token */ |
| *s += strspn(*s + 1, WHITESPACE) + 1; |
| if (split_equals && *s[0] == '=' && !wspace) |
| *s += strspn(*s + 1, WHITESPACE) + 1; |
| |
| return (old); |
| } |
| |
| /* |
| * Return next token in configuration line; splts on whitespace or a |
| * single '=' character. |
| */ |
| char * |
| strdelim(char **s) |
| { |
| return strdelim_internal(s, 1); |
| } |
| |
| /* |
| * Return next token in configuration line; splts on whitespace only. |
| */ |
| char * |
| strdelimw(char **s) |
| { |
| return strdelim_internal(s, 0); |
| } |
| |
| struct passwd * |
| pwcopy(struct passwd *pw) |
| { |
| struct passwd *copy = xcalloc(1, sizeof(*copy)); |
| |
| copy->pw_name = xstrdup(pw->pw_name); |
| copy->pw_passwd = xstrdup(pw->pw_passwd); |
| #ifdef HAVE_STRUCT_PASSWD_PW_GECOS |
| copy->pw_gecos = xstrdup(pw->pw_gecos); |
| #endif |
| copy->pw_uid = pw->pw_uid; |
| copy->pw_gid = pw->pw_gid; |
| #ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE |
| copy->pw_expire = pw->pw_expire; |
| #endif |
| #ifdef HAVE_STRUCT_PASSWD_PW_CHANGE |
| copy->pw_change = pw->pw_change; |
| #endif |
| #ifdef HAVE_STRUCT_PASSWD_PW_CLASS |
| copy->pw_class = xstrdup(pw->pw_class); |
| #endif |
| copy->pw_dir = xstrdup(pw->pw_dir); |
| copy->pw_shell = xstrdup(pw->pw_shell); |
| return copy; |
| } |
| |
| /* |
| * Convert ASCII string to TCP/IP port number. |
| * Port must be >=0 and <=65535. |
| * Return -1 if invalid. |
| */ |
| int |
| a2port(const char *s) |
| { |
| struct servent *se; |
| long long port; |
| const char *errstr; |
| |
| port = strtonum(s, 0, 65535, &errstr); |
| if (errstr == NULL) |
| return (int)port; |
| if ((se = getservbyname(s, "tcp")) != NULL) |
| return ntohs(se->s_port); |
| return -1; |
| } |
| |
| int |
| a2tun(const char *s, int *remote) |
| { |
| const char *errstr = NULL; |
| char *sp, *ep; |
| int tun; |
| |
| if (remote != NULL) { |
| *remote = SSH_TUNID_ANY; |
| sp = xstrdup(s); |
| if ((ep = strchr(sp, ':')) == NULL) { |
| free(sp); |
| return (a2tun(s, NULL)); |
| } |
| ep[0] = '\0'; ep++; |
| *remote = a2tun(ep, NULL); |
| tun = a2tun(sp, NULL); |
| free(sp); |
| return (*remote == SSH_TUNID_ERR ? *remote : tun); |
| } |
| |
| if (strcasecmp(s, "any") == 0) |
| return (SSH_TUNID_ANY); |
| |
| tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); |
| if (errstr != NULL) |
| return (SSH_TUNID_ERR); |
| |
| return (tun); |
| } |
| |
| #define SECONDS 1 |
| #define MINUTES (SECONDS * 60) |
| #define HOURS (MINUTES * 60) |
| #define DAYS (HOURS * 24) |
| #define WEEKS (DAYS * 7) |
| |
| /* |
| * Convert a time string into seconds; format is |
| * a sequence of: |
| * time[qualifier] |
| * |
| * Valid time qualifiers are: |
| * <none> seconds |
| * s|S seconds |
| * m|M minutes |
| * h|H hours |
| * d|D days |
| * w|W weeks |
| * |
| * Examples: |
| * 90m 90 minutes |
| * 1h30m 90 minutes |
| * 2d 2 days |
| * 1w 1 week |
| * |
| * Return -1 if time string is invalid. |
| */ |
| long |
| convtime(const char *s) |
| { |
| long total, secs, multiplier = 1; |
| const char *p; |
| char *endp; |
| |
| errno = 0; |
| total = 0; |
| p = s; |
| |
| if (p == NULL || *p == '\0') |
| return -1; |
| |
| while (*p) { |
| secs = strtol(p, &endp, 10); |
| if (p == endp || |
| (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || |
| secs < 0) |
| return -1; |
| |
| switch (*endp++) { |
| case '\0': |
| endp--; |
| break; |
| case 's': |
| case 'S': |
| break; |
| case 'm': |
| case 'M': |
| multiplier = MINUTES; |
| break; |
| case 'h': |
| case 'H': |
| multiplier = HOURS; |
| break; |
| case 'd': |
| case 'D': |
| multiplier = DAYS; |
| break; |
| case 'w': |
| case 'W': |
| multiplier = WEEKS; |
| break; |
| default: |
| return -1; |
| } |
| if (secs >= LONG_MAX / multiplier) |
| return -1; |
| secs *= multiplier; |
| if (total >= LONG_MAX - secs) |
| return -1; |
| total += secs; |
| if (total < 0) |
| return -1; |
| p = endp; |
| } |
| |
| return total; |
| } |
| |
| /* |
| * Returns a standardized host+port identifier string. |
| * Caller must free returned string. |
| */ |
| char * |
| put_host_port(const char *host, u_short port) |
| { |
| char *hoststr; |
| |
| if (port == 0 || port == SSH_DEFAULT_PORT) |
| return(xstrdup(host)); |
| if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1) |
| fatal("put_host_port: asprintf: %s", strerror(errno)); |
| debug3("put_host_port: %s", hoststr); |
| return hoststr; |
| } |
| |
| /* |
| * Search for next delimiter between hostnames/addresses and ports. |
| * Argument may be modified (for termination). |
| * Returns *cp if parsing succeeds. |
| * *cp is set to the start of the next field, if one was found. |
| * The delimiter char, if present, is stored in delim. |
| * If this is the last field, *cp is set to NULL. |
| */ |
| char * |
| hpdelim2(char **cp, char *delim) |
| { |
| char *s, *old; |
| |
| if (cp == NULL || *cp == NULL) |
| return NULL; |
| |
| old = s = *cp; |
| if (*s == '[') { |
| if ((s = strchr(s, ']')) == NULL) |
| return NULL; |
| else |
| s++; |
| } else if ((s = strpbrk(s, ":/")) == NULL) |
| s = *cp + strlen(*cp); /* skip to end (see first case below) */ |
| |
| switch (*s) { |
| case '\0': |
| *cp = NULL; /* no more fields*/ |
| break; |
| |
| case ':': |
| case '/': |
| if (delim != NULL) |
| *delim = *s; |
| *s = '\0'; /* terminate */ |
| *cp = s + 1; |
| break; |
| |
| default: |
| return NULL; |
| } |
| |
| return old; |
| } |
| |
| char * |
| hpdelim(char **cp) |
| { |
| return hpdelim2(cp, NULL); |
| } |
| |
| char * |
| cleanhostname(char *host) |
| { |
| if (*host == '[' && host[strlen(host) - 1] == ']') { |
| host[strlen(host) - 1] = '\0'; |
| return (host + 1); |
| } else |
| return host; |
| } |
| |
| char * |
| colon(char *cp) |
| { |
| int flag = 0; |
| |
| if (*cp == ':') /* Leading colon is part of file name. */ |
| return NULL; |
| if (*cp == '[') |
| flag = 1; |
| |
| for (; *cp; ++cp) { |
| if (*cp == '@' && *(cp+1) == '[') |
| flag = 1; |
| if (*cp == ']' && *(cp+1) == ':' && flag) |
| return (cp+1); |
| if (*cp == ':' && !flag) |
| return (cp); |
| if (*cp == '/') |
| return NULL; |
| } |
| return NULL; |
| } |
| |
| /* |
| * Parse a [user@]host:[path] string. |
| * Caller must free returned user, host and path. |
| * Any of the pointer return arguments may be NULL (useful for syntax checking). |
| * If user was not specified then *userp will be set to NULL. |
| * If host was not specified then *hostp will be set to NULL. |
| * If path was not specified then *pathp will be set to ".". |
| * Returns 0 on success, -1 on failure. |
| */ |
| int |
| parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp) |
| { |
| char *user = NULL, *host = NULL, *path = NULL; |
| char *sdup, *tmp; |
| int ret = -1; |
| |
| if (userp != NULL) |
| *userp = NULL; |
| if (hostp != NULL) |
| *hostp = NULL; |
| if (pathp != NULL) |
| *pathp = NULL; |
| |
| sdup = xstrdup(s); |
| |
| /* Check for remote syntax: [user@]host:[path] */ |
| if ((tmp = colon(sdup)) == NULL) |
| goto out; |
| |
| /* Extract optional path */ |
| *tmp++ = '\0'; |
| if (*tmp == '\0') |
| tmp = "."; |
| path = xstrdup(tmp); |
| |
| /* Extract optional user and mandatory host */ |
| tmp = strrchr(sdup, '@'); |
| if (tmp != NULL) { |
| *tmp++ = '\0'; |
| host = xstrdup(cleanhostname(tmp)); |
| if (*sdup != '\0') |
| user = xstrdup(sdup); |
| } else { |
| host = xstrdup(cleanhostname(sdup)); |
| user = NULL; |
| } |
| |
| /* Success */ |
| if (userp != NULL) { |
| *userp = user; |
| user = NULL; |
| } |
| if (hostp != NULL) { |
| *hostp = host; |
| host = NULL; |
| } |
| if (pathp != NULL) { |
| *pathp = path; |
| path = NULL; |
| } |
| ret = 0; |
| out: |
| free(sdup); |
| free(user); |
| free(host); |
| free(path); |
| return ret; |
| } |
| |
| /* |
| * Parse a [user@]host[:port] string. |
| * Caller must free returned user and host. |
| * Any of the pointer return arguments may be NULL (useful for syntax checking). |
| * If user was not specified then *userp will be set to NULL. |
| * If port was not specified then *portp will be -1. |
| * Returns 0 on success, -1 on failure. |
| */ |
| int |
| parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) |
| { |
| char *sdup, *cp, *tmp; |
| char *user = NULL, *host = NULL; |
| int port = -1, ret = -1; |
| |
| if (userp != NULL) |
| *userp = NULL; |
| if (hostp != NULL) |
| *hostp = NULL; |
| if (portp != NULL) |
| *portp = -1; |
| |
| if ((sdup = tmp = strdup(s)) == NULL) |
| return -1; |
| /* Extract optional username */ |
| if ((cp = strrchr(tmp, '@')) != NULL) { |
| *cp = '\0'; |
| if (*tmp == '\0') |
| goto out; |
| if ((user = strdup(tmp)) == NULL) |
| goto out; |
| tmp = cp + 1; |
| } |
| /* Extract mandatory hostname */ |
| if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0') |
| goto out; |
| host = xstrdup(cleanhostname(cp)); |
| /* Convert and verify optional port */ |
| if (tmp != NULL && *tmp != '\0') { |
| if ((port = a2port(tmp)) <= 0) |
| goto out; |
| } |
| /* Success */ |
| if (userp != NULL) { |
| *userp = user; |
| user = NULL; |
| } |
| if (hostp != NULL) { |
| *hostp = host; |
| host = NULL; |
| } |
| if (portp != NULL) |
| *portp = port; |
| ret = 0; |
| out: |
| free(sdup); |
| free(user); |
| free(host); |
| return ret; |
| } |
| |
| /* |
| * Converts a two-byte hex string to decimal. |
| * Returns the decimal value or -1 for invalid input. |
| */ |
| static int |
| hexchar(const char *s) |
| { |
| unsigned char result[2]; |
| int i; |
| |
| for (i = 0; i < 2; i++) { |
| if (s[i] >= '0' && s[i] <= '9') |
| result[i] = (unsigned char)(s[i] - '0'); |
| else if (s[i] >= 'a' && s[i] <= 'f') |
| result[i] = (unsigned char)(s[i] - 'a') + 10; |
| else if (s[i] >= 'A' && s[i] <= 'F') |
| result[i] = (unsigned char)(s[i] - 'A') + 10; |
| else |
| return -1; |
| } |
| return (result[0] << 4) | result[1]; |
| } |
| |
| /* |
| * Decode an url-encoded string. |
| * Returns a newly allocated string on success or NULL on failure. |
| */ |
| static char * |
| urldecode(const char *src) |
| { |
| char *ret, *dst; |
| int ch; |
| |
| ret = xmalloc(strlen(src) + 1); |
| for (dst = ret; *src != '\0'; src++) { |
| switch (*src) { |
| case '+': |
| *dst++ = ' '; |
| break; |
| case '%': |
| if (!isxdigit((unsigned char)src[1]) || |
| !isxdigit((unsigned char)src[2]) || |
| (ch = hexchar(src + 1)) == -1) { |
| free(ret); |
| return NULL; |
| } |
| *dst++ = ch; |
| src += 2; |
| break; |
| default: |
| *dst++ = *src; |
| break; |
| } |
| } |
| *dst = '\0'; |
| |
| return ret; |
| } |
| |
| /* |
| * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI. |
| * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04 |
| * Either user or path may be url-encoded (but not host or port). |
| * Caller must free returned user, host and path. |
| * Any of the pointer return arguments may be NULL (useful for syntax checking) |
| * but the scheme must always be specified. |
| * If user was not specified then *userp will be set to NULL. |
| * If port was not specified then *portp will be -1. |
| * If path was not specified then *pathp will be set to NULL. |
| * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri. |
| */ |
| int |
| parse_uri(const char *scheme, const char *uri, char **userp, char **hostp, |
| int *portp, char **pathp) |
| { |
| char *uridup, *cp, *tmp, ch; |
| char *user = NULL, *host = NULL, *path = NULL; |
| int port = -1, ret = -1; |
| size_t len; |
| |
| len = strlen(scheme); |
| if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0) |
| return 1; |
| uri += len + 3; |
| |
| if (userp != NULL) |
| *userp = NULL; |
| if (hostp != NULL) |
| *hostp = NULL; |
| if (portp != NULL) |
| *portp = -1; |
| if (pathp != NULL) |
| *pathp = NULL; |
| |
| uridup = tmp = xstrdup(uri); |
| |
| /* Extract optional ssh-info (username + connection params) */ |
| if ((cp = strchr(tmp, '@')) != NULL) { |
| char *delim; |
| |
| *cp = '\0'; |
| /* Extract username and connection params */ |
| if ((delim = strchr(tmp, ';')) != NULL) { |
| /* Just ignore connection params for now */ |
| *delim = '\0'; |
| } |
| if (*tmp == '\0') { |
| /* Empty username */ |
| goto out; |
| } |
| if ((user = urldecode(tmp)) == NULL) |
| goto out; |
| tmp = cp + 1; |
| } |
| |
| /* Extract mandatory hostname */ |
| if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0') |
| goto out; |
| host = xstrdup(cleanhostname(cp)); |
| if (!valid_domain(host, 0, NULL)) |
| goto out; |
| |
| if (tmp != NULL && *tmp != '\0') { |
| if (ch == ':') { |
| /* Convert and verify port. */ |
| if ((cp = strchr(tmp, '/')) != NULL) |
| *cp = '\0'; |
| if ((port = a2port(tmp)) <= 0) |
| goto out; |
| tmp = cp ? cp + 1 : NULL; |
| } |
| if (tmp != NULL && *tmp != '\0') { |
| /* Extract optional path */ |
| if ((path = urldecode(tmp)) == NULL) |
| goto out; |
| } |
| } |
| |
| /* Success */ |
| if (userp != NULL) { |
| *userp = user; |
| user = NULL; |
| } |
| if (hostp != NULL) { |
| *hostp = host; |
| host = NULL; |
| } |
| if (portp != NULL) |
| *portp = port; |
| if (pathp != NULL) { |
| *pathp = path; |
| path = NULL; |
| } |
| ret = 0; |
| out: |
| free(uridup); |
| free(user); |
| free(host); |
| free(path); |
| return ret; |
| } |
| |
| /* function to assist building execv() arguments */ |
| void |
| addargs(arglist *args, char *fmt, ...) |
| { |
| va_list ap; |
| char *cp; |
| u_int nalloc; |
| int r; |
| |
| va_start(ap, fmt); |
| r = vasprintf(&cp, fmt, ap); |
| va_end(ap); |
| if (r == -1) |
| fatal("addargs: argument too long"); |
| |
| nalloc = args->nalloc; |
| if (args->list == NULL) { |
| nalloc = 32; |
| args->num = 0; |
| } else if (args->num+2 >= nalloc) |
| nalloc *= 2; |
| |
| args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *)); |
| args->nalloc = nalloc; |
| args->list[args->num++] = cp; |
| args->list[args->num] = NULL; |
| } |
| |
| void |
| replacearg(arglist *args, u_int which, char *fmt, ...) |
| { |
| va_list ap; |
| char *cp; |
| int r; |
| |
| va_start(ap, fmt); |
| r = vasprintf(&cp, fmt, ap); |
| va_end(ap); |
| if (r == -1) |
| fatal("replacearg: argument too long"); |
| |
| if (which >= args->num) |
| fatal("replacearg: tried to replace invalid arg %d >= %d", |
| which, args->num); |
| free(args->list[which]); |
| args->list[which] = cp; |
| } |
| |
| void |
| freeargs(arglist *args) |
| { |
| u_int i; |
| |
| if (args->list != NULL) { |
| for (i = 0; i < args->num; i++) |
| free(args->list[i]); |
| free(args->list); |
| args->nalloc = args->num = 0; |
| args->list = NULL; |
| } |
| } |
| |
| /* |
| * Expands tildes in the file name. Returns data allocated by xmalloc. |
| * Warning: this calls getpw*. |
| */ |
| char * |
| tilde_expand_filename(const char *filename, uid_t uid) |
| { |
| const char *path, *sep; |
| char user[128], *ret; |
| struct passwd *pw; |
| u_int len, slash; |
| |
| if (*filename != '~') |
| return (xstrdup(filename)); |
| filename++; |
| |
| path = strchr(filename, '/'); |
| if (path != NULL && path > filename) { /* ~user/path */ |
| slash = path - filename; |
| if (slash > sizeof(user) - 1) |
| fatal("tilde_expand_filename: ~username too long"); |
| memcpy(user, filename, slash); |
| user[slash] = '\0'; |
| if ((pw = getpwnam(user)) == NULL) |
| fatal("tilde_expand_filename: No such user %s", user); |
| } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ |
| fatal("tilde_expand_filename: No such uid %ld", (long)uid); |
| |
| /* Make sure directory has a trailing '/' */ |
| len = strlen(pw->pw_dir); |
| if (len == 0 || pw->pw_dir[len - 1] != '/') |
| sep = "/"; |
| else |
| sep = ""; |
| |
| /* Skip leading '/' from specified path */ |
| if (path != NULL) |
| filename = path + 1; |
| |
| if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX) |
| fatal("tilde_expand_filename: Path too long"); |
| |
| return (ret); |
| } |
| |
| /* |
| * Expand a string with a set of %[char] escapes. A number of escapes may be |
| * specified as (char *escape_chars, char *replacement) pairs. The list must |
| * be terminated by a NULL escape_char. Returns replaced string in memory |
| * allocated by xmalloc. |
| */ |
| char * |
| percent_expand(const char *string, ...) |
| { |
| #define EXPAND_MAX_KEYS 16 |
| u_int num_keys, i; |
| struct { |
| const char *key; |
| const char *repl; |
| } keys[EXPAND_MAX_KEYS]; |
| struct sshbuf *buf; |
| va_list ap; |
| int r; |
| char *ret; |
| |
| if ((buf = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| |
| /* Gather keys */ |
| va_start(ap, string); |
| for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { |
| keys[num_keys].key = va_arg(ap, char *); |
| if (keys[num_keys].key == NULL) |
| break; |
| keys[num_keys].repl = va_arg(ap, char *); |
| if (keys[num_keys].repl == NULL) |
| fatal("%s: NULL replacement", __func__); |
| } |
| if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) |
| fatal("%s: too many keys", __func__); |
| va_end(ap); |
| |
| /* Expand string */ |
| for (i = 0; *string != '\0'; string++) { |
| if (*string != '%') { |
| append: |
| if ((r = sshbuf_put_u8(buf, *string)) != 0) { |
| fatal("%s: sshbuf_put_u8: %s", |
| __func__, ssh_err(r)); |
| } |
| continue; |
| } |
| string++; |
| /* %% case */ |
| if (*string == '%') |
| goto append; |
| if (*string == '\0') |
| fatal("%s: invalid format", __func__); |
| for (i = 0; i < num_keys; i++) { |
| if (strchr(keys[i].key, *string) != NULL) { |
| if ((r = sshbuf_put(buf, keys[i].repl, |
| strlen(keys[i].repl))) != 0) { |
| fatal("%s: sshbuf_put: %s", |
| __func__, ssh_err(r)); |
| } |
| break; |
| } |
| } |
| if (i >= num_keys) |
| fatal("%s: unknown key %%%c", __func__, *string); |
| } |
| if ((ret = sshbuf_dup_string(buf)) == NULL) |
| fatal("%s: sshbuf_dup_string failed", __func__); |
| sshbuf_free(buf); |
| return ret; |
| #undef EXPAND_MAX_KEYS |
| } |
| |
| int |
| tun_open(int tun, int mode, char **ifname) |
| { |
| #if defined(CUSTOM_SYS_TUN_OPEN) |
| return (sys_tun_open(tun, mode, ifname)); |
| #elif defined(SSH_TUN_OPENBSD) |
| struct ifreq ifr; |
| char name[100]; |
| int fd = -1, sock; |
| const char *tunbase = "tun"; |
| |
| if (ifname != NULL) |
| *ifname = NULL; |
| |
| if (mode == SSH_TUNMODE_ETHERNET) |
| tunbase = "tap"; |
| |
| /* Open the tunnel device */ |
| if (tun <= SSH_TUNID_MAX) { |
| snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); |
| fd = open(name, O_RDWR); |
| } else if (tun == SSH_TUNID_ANY) { |
| for (tun = 100; tun >= 0; tun--) { |
| snprintf(name, sizeof(name), "/dev/%s%d", |
| tunbase, tun); |
| if ((fd = open(name, O_RDWR)) >= 0) |
| break; |
| } |
| } else { |
| debug("%s: invalid tunnel %u", __func__, tun); |
| return -1; |
| } |
| |
| if (fd == -1) { |
| debug("%s: %s open: %s", __func__, name, strerror(errno)); |
| return -1; |
| } |
| |
| debug("%s: %s mode %d fd %d", __func__, name, mode, fd); |
| |
| /* Bring interface up if it is not already */ |
| snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); |
| if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) |
| goto failed; |
| |
| if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { |
| debug("%s: get interface %s flags: %s", __func__, |
| ifr.ifr_name, strerror(errno)); |
| goto failed; |
| } |
| |
| if (!(ifr.ifr_flags & IFF_UP)) { |
| ifr.ifr_flags |= IFF_UP; |
| if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { |
| debug("%s: activate interface %s: %s", __func__, |
| ifr.ifr_name, strerror(errno)); |
| goto failed; |
| } |
| } |
| |
| if (ifname != NULL) |
| *ifname = xstrdup(ifr.ifr_name); |
| |
| close(sock); |
| return fd; |
| |
| failed: |
| if (fd >= 0) |
| close(fd); |
| if (sock >= 0) |
| close(sock); |
| return -1; |
| #else |
| error("Tunnel interfaces are not supported on this platform"); |
| return (-1); |
| #endif |
| } |
| |
| void |
| sanitise_stdfd(void) |
| { |
| int nullfd, dupfd; |
| |
| if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
| fprintf(stderr, "Couldn't open /dev/null: %s\n", |
| strerror(errno)); |
| exit(1); |
| } |
| while (++dupfd <= STDERR_FILENO) { |
| /* Only populate closed fds. */ |
| if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { |
| if (dup2(nullfd, dupfd) == -1) { |
| fprintf(stderr, "dup2: %s\n", strerror(errno)); |
| exit(1); |
| } |
| } |
| } |
| if (nullfd > STDERR_FILENO) |
| close(nullfd); |
| } |
| |
| char * |
| tohex(const void *vp, size_t l) |
| { |
| const u_char *p = (const u_char *)vp; |
| char b[3], *r; |
| size_t i, hl; |
| |
| if (l > 65536) |
| return xstrdup("tohex: length > 65536"); |
| |
| hl = l * 2 + 1; |
| r = xcalloc(1, hl); |
| for (i = 0; i < l; i++) { |
| snprintf(b, sizeof(b), "%02x", p[i]); |
| strlcat(r, b, hl); |
| } |
| return (r); |
| } |
| |
| u_int64_t |
| get_u64(const void *vp) |
| { |
| const u_char *p = (const u_char *)vp; |
| u_int64_t v; |
| |
| v = (u_int64_t)p[0] << 56; |
| v |= (u_int64_t)p[1] << 48; |
| v |= (u_int64_t)p[2] << 40; |
| v |= (u_int64_t)p[3] << 32; |
| v |= (u_int64_t)p[4] << 24; |
| v |= (u_int64_t)p[5] << 16; |
| v |= (u_int64_t)p[6] << 8; |
| v |= (u_int64_t)p[7]; |
| |
| return (v); |
| } |
| |
| u_int32_t |
| get_u32(const void *vp) |
| { |
| const u_char *p = (const u_char *)vp; |
| u_int32_t v; |
| |
| v = (u_int32_t)p[0] << 24; |
| v |= (u_int32_t)p[1] << 16; |
| v |= (u_int32_t)p[2] << 8; |
| v |= (u_int32_t)p[3]; |
| |
| return (v); |
| } |
| |
| u_int32_t |
| get_u32_le(const void *vp) |
| { |
| const u_char *p = (const u_char *)vp; |
| u_int32_t v; |
| |
| v = (u_int32_t)p[0]; |
| v |= (u_int32_t)p[1] << 8; |
| v |= (u_int32_t)p[2] << 16; |
| v |= (u_int32_t)p[3] << 24; |
| |
| return (v); |
| } |
| |
| u_int16_t |
| get_u16(const void *vp) |
| { |
| const u_char *p = (const u_char *)vp; |
| u_int16_t v; |
| |
| v = (u_int16_t)p[0] << 8; |
| v |= (u_int16_t)p[1]; |
| |
| return (v); |
| } |
| |
| void |
| put_u64(void *vp, u_int64_t v) |
| { |
| u_char *p = (u_char *)vp; |
| |
| p[0] = (u_char)(v >> 56) & 0xff; |
| p[1] = (u_char)(v >> 48) & 0xff; |
| p[2] = (u_char)(v >> 40) & 0xff; |
| p[3] = (u_char)(v >> 32) & 0xff; |
| p[4] = (u_char)(v >> 24) & 0xff; |
| p[5] = (u_char)(v >> 16) & 0xff; |
| p[6] = (u_char)(v >> 8) & 0xff; |
| p[7] = (u_char)v & 0xff; |
| } |
| |
| void |
| put_u32(void *vp, u_int32_t v) |
| { |
| u_char *p = (u_char *)vp; |
| |
| p[0] = (u_char)(v >> 24) & 0xff; |
| p[1] = (u_char)(v >> 16) & 0xff; |
| p[2] = (u_char)(v >> 8) & 0xff; |
| p[3] = (u_char)v & 0xff; |
| } |
| |
| void |
| put_u32_le(void *vp, u_int32_t v) |
| { |
| u_char *p = (u_char *)vp; |
| |
| p[0] = (u_char)v & 0xff; |
| p[1] = (u_char)(v >> 8) & 0xff; |
| p[2] = (u_char)(v >> 16) & 0xff; |
| p[3] = (u_char)(v >> 24) & 0xff; |
| } |
| |
| void |
| put_u16(void *vp, u_int16_t v) |
| { |
| u_char *p = (u_char *)vp; |
| |
| p[0] = (u_char)(v >> 8) & 0xff; |
| p[1] = (u_char)v & 0xff; |
| } |
| |
| void |
| ms_subtract_diff(struct timeval *start, int *ms) |
| { |
| struct timeval diff, finish; |
| |
| monotime_tv(&finish); |
| timersub(&finish, start, &diff); |
| *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); |
| } |
| |
| void |
| ms_to_timeval(struct timeval *tv, int ms) |
| { |
| if (ms < 0) |
| ms = 0; |
| tv->tv_sec = ms / 1000; |
| tv->tv_usec = (ms % 1000) * 1000; |
| } |
| |
| void |
| monotime_ts(struct timespec *ts) |
| { |
| struct timeval tv; |
| #if defined(HAVE_CLOCK_GETTIME) && (defined(CLOCK_BOOTTIME) || \ |
| defined(CLOCK_MONOTONIC) || defined(CLOCK_REALTIME)) |
| static int gettime_failed = 0; |
| |
| if (!gettime_failed) { |
| # ifdef CLOCK_BOOTTIME |
| if (clock_gettime(CLOCK_BOOTTIME, ts) == 0) |
| return; |
| # endif /* CLOCK_BOOTTIME */ |
| # ifdef CLOCK_MONOTONIC |
| if (clock_gettime(CLOCK_MONOTONIC, ts) == 0) |
| return; |
| # endif /* CLOCK_MONOTONIC */ |
| # ifdef CLOCK_REALTIME |
| /* Not monotonic, but we're almost out of options here. */ |
| if (clock_gettime(CLOCK_REALTIME, ts) == 0) |
| return; |
| # endif /* CLOCK_REALTIME */ |
| debug3("clock_gettime: %s", strerror(errno)); |
| gettime_failed = 1; |
| } |
| #endif /* HAVE_CLOCK_GETTIME && (BOOTTIME || MONOTONIC || REALTIME) */ |
| gettimeofday(&tv, NULL); |
| ts->tv_sec = tv.tv_sec; |
| ts->tv_nsec = (long)tv.tv_usec * 1000; |
| } |
| |
| void |
| monotime_tv(struct timeval *tv) |
| { |
| struct timespec ts; |
| |
| monotime_ts(&ts); |
| tv->tv_sec = ts.tv_sec; |
| tv->tv_usec = ts.tv_nsec / 1000; |
| } |
| |
| time_t |
| monotime(void) |
| { |
| struct timespec ts; |
| |
| monotime_ts(&ts); |
| return ts.tv_sec; |
| } |
| |
| double |
| monotime_double(void) |
| { |
| struct timespec ts; |
| |
| monotime_ts(&ts); |
| return ts.tv_sec + ((double)ts.tv_nsec / 1000000000); |
| } |
| |
| void |
| bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) |
| { |
| bw->buflen = buflen; |
| bw->rate = kbps; |
| bw->thresh = buflen; |
| bw->lamt = 0; |
| timerclear(&bw->bwstart); |
| timerclear(&bw->bwend); |
| } |
| |
| /* Callback from read/write loop to insert bandwidth-limiting delays */ |
| void |
| bandwidth_limit(struct bwlimit *bw, size_t read_len) |
| { |
| u_int64_t waitlen; |
| struct timespec ts, rm; |
| |
| bw->lamt += read_len; |
| if (!timerisset(&bw->bwstart)) { |
| monotime_tv(&bw->bwstart); |
| return; |
| } |
| if (bw->lamt < bw->thresh) |
| return; |
| |
| monotime_tv(&bw->bwend); |
| timersub(&bw->bwend, &bw->bwstart, &bw->bwend); |
| if (!timerisset(&bw->bwend)) |
| return; |
| |
| bw->lamt *= 8; |
| waitlen = (double)1000000L * bw->lamt / bw->rate; |
| |
| bw->bwstart.tv_sec = waitlen / 1000000L; |
| bw->bwstart.tv_usec = waitlen % 1000000L; |
| |
| if (timercmp(&bw->bwstart, &bw->bwend, >)) { |
| timersub(&bw->bwstart, &bw->bwend, &bw->bwend); |
| |
| /* Adjust the wait time */ |
| if (bw->bwend.tv_sec) { |
| bw->thresh /= 2; |
| if (bw->thresh < bw->buflen / 4) |
| bw->thresh = bw->buflen / 4; |
| } else if (bw->bwend.tv_usec < 10000) { |
| bw->thresh *= 2; |
| if (bw->thresh > bw->buflen * 8) |
| bw->thresh = bw->buflen * 8; |
| } |
| |
| TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); |
| while (nanosleep(&ts, &rm) == -1) { |
| if (errno != EINTR) |
| break; |
| ts = rm; |
| } |
| } |
| |
| bw->lamt = 0; |
| monotime_tv(&bw->bwstart); |
| } |
| |
| /* Make a template filename for mk[sd]temp() */ |
| void |
| mktemp_proto(char *s, size_t len) |
| { |
| const char *tmpdir; |
| int r; |
| |
| if ((tmpdir = getenv("TMPDIR")) != NULL) { |
| r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); |
| if (r > 0 && (size_t)r < len) |
| return; |
| } |
| r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); |
| if (r < 0 || (size_t)r >= len) |
| fatal("%s: template string too short", __func__); |
| } |
| |
| static const struct { |
| const char *name; |
| int value; |
| } ipqos[] = { |
| { "none", INT_MAX }, /* can't use 0 here; that's CS0 */ |
| { "af11", IPTOS_DSCP_AF11 }, |
| { "af12", IPTOS_DSCP_AF12 }, |
| { "af13", IPTOS_DSCP_AF13 }, |
| { "af21", IPTOS_DSCP_AF21 }, |
| { "af22", IPTOS_DSCP_AF22 }, |
| { "af23", IPTOS_DSCP_AF23 }, |
| { "af31", IPTOS_DSCP_AF31 }, |
| { "af32", IPTOS_DSCP_AF32 }, |
| { "af33", IPTOS_DSCP_AF33 }, |
| { "af41", IPTOS_DSCP_AF41 }, |
| { "af42", IPTOS_DSCP_AF42 }, |
| { "af43", IPTOS_DSCP_AF43 }, |
| { "cs0", IPTOS_DSCP_CS0 }, |
| { "cs1", IPTOS_DSCP_CS1 }, |
| { "cs2", IPTOS_DSCP_CS2 }, |
| { "cs3", IPTOS_DSCP_CS3 }, |
| { "cs4", IPTOS_DSCP_CS4 }, |
| { "cs5", IPTOS_DSCP_CS5 }, |
| { "cs6", IPTOS_DSCP_CS6 }, |
| { "cs7", IPTOS_DSCP_CS7 }, |
| { "ef", IPTOS_DSCP_EF }, |
| { "lowdelay", IPTOS_LOWDELAY }, |
| { "throughput", IPTOS_THROUGHPUT }, |
| { "reliability", IPTOS_RELIABILITY }, |
| { NULL, -1 } |
| }; |
| |
| int |
| parse_ipqos(const char *cp) |
| { |
| u_int i; |
| char *ep; |
| long val; |
| |
| if (cp == NULL) |
| return -1; |
| for (i = 0; ipqos[i].name != NULL; i++) { |
| if (strcasecmp(cp, ipqos[i].name) == 0) |
| return ipqos[i].value; |
| } |
| /* Try parsing as an integer */ |
| val = strtol(cp, &ep, 0); |
| if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) |
| return -1; |
| return val; |
| } |
| |
| const char * |
| iptos2str(int iptos) |
| { |
| int i; |
| static char iptos_str[sizeof "0xff"]; |
| |
| for (i = 0; ipqos[i].name != NULL; i++) { |
| if (ipqos[i].value == iptos) |
| return ipqos[i].name; |
| } |
| snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); |
| return iptos_str; |
| } |
| |
| void |
| lowercase(char *s) |
| { |
| for (; *s; s++) |
| *s = tolower((u_char)*s); |
| } |
| |
| int |
| unix_listener(const char *path, int backlog, int unlink_first) |
| { |
| struct sockaddr_un sunaddr; |
| int saved_errno, sock; |
| |
| memset(&sunaddr, 0, sizeof(sunaddr)); |
| sunaddr.sun_family = AF_UNIX; |
| if (strlcpy(sunaddr.sun_path, path, |
| sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { |
| error("%s: path \"%s\" too long for Unix domain socket", |
| __func__, path); |
| errno = ENAMETOOLONG; |
| return -1; |
| } |
| |
| sock = socket(PF_UNIX, SOCK_STREAM, 0); |
| if (sock == -1) { |
| saved_errno = errno; |
| error("%s: socket: %.100s", __func__, strerror(errno)); |
| errno = saved_errno; |
| return -1; |
| } |
| if (unlink_first == 1) { |
| if (unlink(path) != 0 && errno != ENOENT) |
| error("unlink(%s): %.100s", path, strerror(errno)); |
| } |
| if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { |
| saved_errno = errno; |
| error("%s: cannot bind to path %s: %s", |
| __func__, path, strerror(errno)); |
| close(sock); |
| errno = saved_errno; |
| return -1; |
| } |
| if (listen(sock, backlog) == -1) { |
| saved_errno = errno; |
| error("%s: cannot listen on path %s: %s", |
| __func__, path, strerror(errno)); |
| close(sock); |
| unlink(path); |
| errno = saved_errno; |
| return -1; |
| } |
| return sock; |
| } |
| |
| void |
| sock_set_v6only(int s) |
| { |
| #if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) |
| int on = 1; |
| |
| debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); |
| if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) |
| error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); |
| #endif |
| } |
| |
| /* |
| * Compares two strings that maybe be NULL. Returns non-zero if strings |
| * are both NULL or are identical, returns zero otherwise. |
| */ |
| static int |
| strcmp_maybe_null(const char *a, const char *b) |
| { |
| if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) |
| return 0; |
| if (a != NULL && strcmp(a, b) != 0) |
| return 0; |
| return 1; |
| } |
| |
| /* |
| * Compare two forwards, returning non-zero if they are identical or |
| * zero otherwise. |
| */ |
| int |
| forward_equals(const struct Forward *a, const struct Forward *b) |
| { |
| if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) |
| return 0; |
| if (a->listen_port != b->listen_port) |
| return 0; |
| if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) |
| return 0; |
| if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) |
| return 0; |
| if (a->connect_port != b->connect_port) |
| return 0; |
| if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) |
| return 0; |
| /* allocated_port and handle are not checked */ |
| return 1; |
| } |
| |
| /* returns 1 if process is already daemonized, 0 otherwise */ |
| int |
| daemonized(void) |
| { |
| int fd; |
| |
| if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) { |
| close(fd); |
| return 0; /* have controlling terminal */ |
| } |
| if (getppid() != 1) |
| return 0; /* parent is not init */ |
| if (getsid(0) != getpid()) |
| return 0; /* not session leader */ |
| debug3("already daemonized"); |
| return 1; |
| } |
| |
| |
| /* |
| * Splits 's' into an argument vector. Handles quoted string and basic |
| * escape characters (\\, \", \'). Caller must free the argument vector |
| * and its members. |
| */ |
| int |
| argv_split(const char *s, int *argcp, char ***argvp) |
| { |
| int r = SSH_ERR_INTERNAL_ERROR; |
| int argc = 0, quote, i, j; |
| char *arg, **argv = xcalloc(1, sizeof(*argv)); |
| |
| *argvp = NULL; |
| *argcp = 0; |
| |
| for (i = 0; s[i] != '\0'; i++) { |
| /* Skip leading whitespace */ |
| if (s[i] == ' ' || s[i] == '\t') |
| continue; |
| |
| /* Start of a token */ |
| quote = 0; |
| if (s[i] == '\\' && |
| (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\')) |
| i++; |
| else if (s[i] == '\'' || s[i] == '"') |
| quote = s[i++]; |
| |
| argv = xreallocarray(argv, (argc + 2), sizeof(*argv)); |
| arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1); |
| argv[argc] = NULL; |
| |
| /* Copy the token in, removing escapes */ |
| for (j = 0; s[i] != '\0'; i++) { |
| if (s[i] == '\\') { |
| if (s[i + 1] == '\'' || |
| s[i + 1] == '\"' || |
| s[i + 1] == '\\') { |
| i++; /* Skip '\' */ |
| arg[j++] = s[i]; |
| } else { |
| /* Unrecognised escape */ |
| arg[j++] = s[i]; |
| } |
| } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t')) |
| break; /* done */ |
| else if (quote != 0 && s[i] == quote) |
| break; /* done */ |
| else |
| arg[j++] = s[i]; |
| } |
| if (s[i] == '\0') { |
| if (quote != 0) { |
| /* Ran out of string looking for close quote */ |
| r = SSH_ERR_INVALID_FORMAT; |
| goto out; |
| } |
| break; |
| } |
| } |
| /* Success */ |
| *argcp = argc; |
| *argvp = argv; |
| argc = 0; |
| argv = NULL; |
| r = 0; |
| out: |
| if (argc != 0 && argv != NULL) { |
| for (i = 0; i < argc; i++) |
| free(argv[i]); |
| free(argv); |
| } |
| return r; |
| } |
| |
| /* |
| * Reassemble an argument vector into a string, quoting and escaping as |
| * necessary. Caller must free returned string. |
| */ |
| char * |
| argv_assemble(int argc, char **argv) |
| { |
| int i, j, ws, r; |
| char c, *ret; |
| struct sshbuf *buf, *arg; |
| |
| if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL) |
| fatal("%s: sshbuf_new failed", __func__); |
| |
| for (i = 0; i < argc; i++) { |
| ws = 0; |
| sshbuf_reset(arg); |
| for (j = 0; argv[i][j] != '\0'; j++) { |
| r = 0; |
| c = argv[i][j]; |
| switch (c) { |
| case ' ': |
| case '\t': |
| ws = 1; |
| r = sshbuf_put_u8(arg, c); |
| break; |
| case '\\': |
| case '\'': |
| case '"': |
| if ((r = sshbuf_put_u8(arg, '\\')) != 0) |
| break; |
| /* FALLTHROUGH */ |
| default: |
| r = sshbuf_put_u8(arg, c); |
| break; |
| } |
| if (r != 0) |
| fatal("%s: sshbuf_put_u8: %s", |
| __func__, ssh_err(r)); |
| } |
| if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) || |
| (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) || |
| (r = sshbuf_putb(buf, arg)) != 0 || |
| (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0)) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| } |
| if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL) |
| fatal("%s: malloc failed", __func__); |
| memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf)); |
| ret[sshbuf_len(buf)] = '\0'; |
| sshbuf_free(buf); |
| sshbuf_free(arg); |
| return ret; |
| } |
| |
| /* Returns 0 if pid exited cleanly, non-zero otherwise */ |
| int |
| exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet) |
| { |
| int status; |
| |
| while (waitpid(pid, &status, 0) == -1) { |
| if (errno != EINTR) { |
| error("%s: waitpid: %s", tag, strerror(errno)); |
| return -1; |
| } |
| } |
| if (WIFSIGNALED(status)) { |
| error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status)); |
| return -1; |
| } else if (WEXITSTATUS(status) != 0) { |
| do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, |
| "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status)); |
| return -1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Check a given path for security. This is defined as all components |
| * of the path to the file must be owned by either the owner of |
| * of the file or root and no directories must be group or world writable. |
| * |
| * XXX Should any specific check be done for sym links ? |
| * |
| * Takes a file name, its stat information (preferably from fstat() to |
| * avoid races), the uid of the expected owner, their home directory and an |
| * error buffer plus max size as arguments. |
| * |
| * Returns 0 on success and -1 on failure |
| */ |
| int |
| safe_path(const char *name, struct stat *stp, const char *pw_dir, |
| uid_t uid, char *err, size_t errlen) |
| { |
| char buf[PATH_MAX], homedir[PATH_MAX]; |
| char *cp; |
| int comparehome = 0; |
| struct stat st; |
| |
| if (realpath(name, buf) == NULL) { |
| snprintf(err, errlen, "realpath %s failed: %s", name, |
| strerror(errno)); |
| return -1; |
| } |
| if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) |
| comparehome = 1; |
| |
| if (!S_ISREG(stp->st_mode)) { |
| snprintf(err, errlen, "%s is not a regular file", buf); |
| return -1; |
| } |
| if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || |
| (stp->st_mode & 022) != 0) { |
| snprintf(err, errlen, "bad ownership or modes for file %s", |
| buf); |
| return -1; |
| } |
| |
| /* for each component of the canonical path, walking upwards */ |
| for (;;) { |
| if ((cp = dirname(buf)) == NULL) { |
| snprintf(err, errlen, "dirname() failed"); |
| return -1; |
| } |
| strlcpy(buf, cp, sizeof(buf)); |
| |
| if (stat(buf, &st) == -1 || |
| (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || |
| (st.st_mode & 022) != 0) { |
| snprintf(err, errlen, |
| "bad ownership or modes for directory %s", buf); |
| return -1; |
| } |
| |
| /* If are past the homedir then we can stop */ |
| if (comparehome && strcmp(homedir, buf) == 0) |
| break; |
| |
| /* |
| * dirname should always complete with a "/" path, |
| * but we can be paranoid and check for "." too |
| */ |
| if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) |
| break; |
| } |
| return 0; |
| } |
| |
| /* |
| * Version of safe_path() that accepts an open file descriptor to |
| * avoid races. |
| * |
| * Returns 0 on success and -1 on failure |
| */ |
| int |
| safe_path_fd(int fd, const char *file, struct passwd *pw, |
| char *err, size_t errlen) |
| { |
| struct stat st; |
| |
| /* check the open file to avoid races */ |
| if (fstat(fd, &st) == -1) { |
| snprintf(err, errlen, "cannot stat file %s: %s", |
| file, strerror(errno)); |
| return -1; |
| } |
| return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); |
| } |
| |
| /* |
| * Sets the value of the given variable in the environment. If the variable |
| * already exists, its value is overridden. |
| */ |
| void |
| child_set_env(char ***envp, u_int *envsizep, const char *name, |
| const char *value) |
| { |
| char **env; |
| u_int envsize; |
| u_int i, namelen; |
| |
| if (strchr(name, '=') != NULL) { |
| error("Invalid environment variable \"%.100s\"", name); |
| return; |
| } |
| |
| /* |
| * If we're passed an uninitialized list, allocate a single null |
| * entry before continuing. |
| */ |
| if (*envp == NULL && *envsizep == 0) { |
| *envp = xmalloc(sizeof(char *)); |
| *envp[0] = NULL; |
| *envsizep = 1; |
| } |
| |
| /* |
| * Find the slot where the value should be stored. If the variable |
| * already exists, we reuse the slot; otherwise we append a new slot |
| * at the end of the array, expanding if necessary. |
| */ |
| env = *envp; |
| namelen = strlen(name); |
| for (i = 0; env[i]; i++) |
| if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
| break; |
| if (env[i]) { |
| /* Reuse the slot. */ |
| free(env[i]); |
| } else { |
| /* New variable. Expand if necessary. */ |
| envsize = *envsizep; |
| if (i >= envsize - 1) { |
| if (envsize >= 1000) |
| fatal("child_set_env: too many env vars"); |
| envsize += 50; |
| env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); |
| *envsizep = envsize; |
| } |
| /* Need to set the NULL pointer at end of array beyond the new slot. */ |
| env[i + 1] = NULL; |
| } |
| |
| /* Allocate space and format the variable in the appropriate slot. */ |
| /* XXX xasprintf */ |
| env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
| snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
| } |
| |
| /* |
| * Check and optionally lowercase a domain name, also removes trailing '.' |
| * Returns 1 on success and 0 on failure, storing an error message in errstr. |
| */ |
| int |
| valid_domain(char *name, int makelower, const char **errstr) |
| { |
| size_t i, l = strlen(name); |
| u_char c, last = '\0'; |
| static char errbuf[256]; |
| |
| if (l == 0) { |
| strlcpy(errbuf, "empty domain name", sizeof(errbuf)); |
| goto bad; |
| } |
| if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) { |
| snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" " |
| "starts with invalid character", name); |
| goto bad; |
| } |
| for (i = 0; i < l; i++) { |
| c = tolower((u_char)name[i]); |
| if (makelower) |
| name[i] = (char)c; |
| if (last == '.' && c == '.') { |
| snprintf(errbuf, sizeof(errbuf), "domain name " |
| "\"%.100s\" contains consecutive separators", name); |
| goto bad; |
| } |
| if (c != '.' && c != '-' && !isalnum(c) && |
| c != '_') /* technically invalid, but common */ { |
| snprintf(errbuf, sizeof(errbuf), "domain name " |
| "\"%.100s\" contains invalid characters", name); |
| goto bad; |
| } |
| last = c; |
| } |
| if (name[l - 1] == '.') |
| name[l - 1] = '\0'; |
| if (errstr != NULL) |
| *errstr = NULL; |
| return 1; |
| bad: |
| if (errstr != NULL) |
| *errstr = errbuf; |
| return 0; |
| } |
| |
| /* |
| * Verify that a environment variable name (not including initial '$') is |
| * valid; consisting of one or more alphanumeric or underscore characters only. |
| * Returns 1 on valid, 0 otherwise. |
| */ |
| int |
| valid_env_name(const char *name) |
| { |
| const char *cp; |
| |
| if (name[0] == '\0') |
| return 0; |
| for (cp = name; *cp != '\0'; cp++) { |
| if (!isalnum((u_char)*cp) && *cp != '_') |
| return 0; |
| } |
| return 1; |
| } |
| |
| const char * |
| atoi_err(const char *nptr, int *val) |
| { |
| const char *errstr = NULL; |
| long long num; |
| |
| if (nptr == NULL || *nptr == '\0') |
| return "missing"; |
| num = strtonum(nptr, 0, INT_MAX, &errstr); |
| if (errstr == NULL) |
| *val = (int)num; |
| return errstr; |
| } |
| |
| int |
| parse_absolute_time(const char *s, uint64_t *tp) |
| { |
| struct tm tm; |
| time_t tt; |
| char buf[32], *fmt; |
| |
| *tp = 0; |
| |
| /* |
| * POSIX strptime says "The application shall ensure that there |
| * is white-space or other non-alphanumeric characters between |
| * any two conversion specifications" so arrange things this way. |
| */ |
| switch (strlen(s)) { |
| case 8: /* YYYYMMDD */ |
| fmt = "%Y-%m-%d"; |
| snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); |
| break; |
| case 12: /* YYYYMMDDHHMM */ |
| fmt = "%Y-%m-%dT%H:%M"; |
| snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s", |
| s, s + 4, s + 6, s + 8, s + 10); |
| break; |
| case 14: /* YYYYMMDDHHMMSS */ |
| fmt = "%Y-%m-%dT%H:%M:%S"; |
| snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", |
| s, s + 4, s + 6, s + 8, s + 10, s + 12); |
| break; |
| default: |
| return SSH_ERR_INVALID_FORMAT; |
| } |
| |
| memset(&tm, 0, sizeof(tm)); |
| if (strptime(buf, fmt, &tm) == NULL) |
| return SSH_ERR_INVALID_FORMAT; |
| if ((tt = mktime(&tm)) < 0) |
| return SSH_ERR_INVALID_FORMAT; |
| /* success */ |
| *tp = (uint64_t)tt; |
| return 0; |
| } |
| |
| void |
| format_absolute_time(uint64_t t, char *buf, size_t len) |
| { |
| time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */ |
| struct tm tm; |
| |
| localtime_r(&tt, &tm); |
| strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm); |
| } |
| |
| /* check if path is absolute */ |
| int |
| path_absolute(const char *path) |
| { |
| return (*path == '/') ? 1 : 0; |
| } |