Edit
IABSD.fr/src/usr.bin/ssh/auth-options.c
dtucker
- usr.bin/ssh/auth-options.c
-
/* $OpenBSD: auth-options.c,v 1.101 2023/07/14 07:44:21 dtucker Exp $ */ /* * Copyright (c) 2018 Damien Miller <djm@mindrot.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <sys/types.h> #include <sys/queue.h> #include <stdlib.h> #include <netdb.h> #include <pwd.h> #include <string.h> #include <stdio.h> #include <stdint.h> #include <stdarg.h> #include <ctype.h> #include <limits.h> #include "xmalloc.h" #include "ssherr.h" #include "log.h" #include "sshbuf.h" #include "misc.h" #include "sshkey.h" #include "match.h" #include "ssh2.h" #include "auth-options.h" static int dup_strings(char ***dstp, size_t *ndstp, char **src, size_t nsrc) { char **dst; size_t i, j; *dstp = NULL; *ndstp = 0; if (nsrc == 0) return 0; if (nsrc >= SIZE_MAX / sizeof(*src) || (dst = calloc(nsrc, sizeof(*src))) == NULL) return -1; for (i = 0; i < nsrc; i++) { if ((dst[i] = strdup(src[i])) == NULL) { for (j = 0; j < i; j++) free(dst[j]); free(dst); return -1; } } /* success */ *dstp = dst; *ndstp = nsrc; return 0; } #define OPTIONS_CRITICAL 1 #define OPTIONS_EXTENSIONS 2 static int cert_option_list(struct sshauthopt *opts, struct sshbuf *oblob, u_int which, int crit) { char *command, *allowed; char *name = NULL; struct sshbuf *c = NULL, *data = NULL; int r, ret = -1, found; if ((c = sshbuf_fromb(oblob)) == NULL) { error_f("sshbuf_fromb failed"); goto out; } while (sshbuf_len(c) > 0) { sshbuf_free(data); data = NULL; if ((r = sshbuf_get_cstring(c, &name, NULL)) != 0 || (r = sshbuf_froms(c, &data)) != 0) { error_r(r, "Unable to parse certificate options"); goto out; } debug3("found certificate option \"%.100s\" len %zu", name, sshbuf_len(data)); found = 0; if ((which & OPTIONS_EXTENSIONS) != 0) { if (strcmp(name, "no-touch-required") == 0) { opts->no_require_user_presence = 1; found = 1; } else if (strcmp(name, "permit-X11-forwarding") == 0) { opts->permit_x11_forwarding_flag = 1; found = 1; } else if (strcmp(name, "permit-agent-forwarding") == 0) { opts->permit_agent_forwarding_flag = 1; found = 1; } else if (strcmp(name, "permit-port-forwarding") == 0) { opts->permit_port_forwarding_flag = 1; found = 1; } else if (strcmp(name, "permit-pty") == 0) { opts->permit_pty_flag = 1; found = 1; } else if (strcmp(name, "permit-user-rc") == 0) { opts->permit_user_rc = 1; found = 1; } } if (!found && (which & OPTIONS_CRITICAL) != 0) { if (strcmp(name, "verify-required") == 0) { opts->require_verify = 1; found = 1; } else if (strcmp(name, "force-command") == 0) { if ((r = sshbuf_get_cstring(data, &command, NULL)) != 0) { error_r(r, "Unable to parse \"%s\" " "section", name); goto out; } if (opts->force_command != NULL) { error("Certificate has multiple " "force-command options"); free(command); goto out; } opts->force_command = command; found = 1; } else if (strcmp(name, "source-address") == 0) { if ((r = sshbuf_get_cstring(data, &allowed, NULL)) != 0) { error_r(r, "Unable to parse \"%s\" " "section", name); goto out; } if (opts->required_from_host_cert != NULL) { error("Certificate has multiple " "source-address options"); free(allowed); goto out; } /* Check syntax */ if (addr_match_cidr_list(NULL, allowed) == -1) { error("Certificate source-address " "contents invalid"); goto out; } opts->required_from_host_cert = allowed; found = 1; } } if (!found) { if (crit) { error("Certificate critical option \"%s\" " "is not supported", name); goto out; } else { logit("Certificate extension \"%s\" " "is not supported", name); } } else if (sshbuf_len(data) != 0) { error("Certificate option \"%s\" corrupt " "(extra data)", name); goto out; } free(name); name = NULL; } /* successfully parsed all options */ ret = 0; out: free(name); sshbuf_free(data); sshbuf_free(c); return ret; } struct sshauthopt * sshauthopt_new(void) { struct sshauthopt *ret; if ((ret = calloc(1, sizeof(*ret))) == NULL) return NULL; ret->force_tun_device = -1; return ret; } void sshauthopt_free(struct sshauthopt *opts) { size_t i; if (opts == NULL) return; free(opts->cert_principals); free(opts->force_command); free(opts->required_from_host_cert); free(opts->required_from_host_keys); for (i = 0; i < opts->nenv; i++) free(opts->env[i]); free(opts->env); for (i = 0; i < opts->npermitopen; i++) free(opts->permitopen[i]); free(opts->permitopen); for (i = 0; i < opts->npermitlisten; i++) free(opts->permitlisten[i]); free(opts->permitlisten); freezero(opts, sizeof(*opts)); } struct sshauthopt * sshauthopt_new_with_keys_defaults(void) { struct sshauthopt *ret = NULL; if ((ret = sshauthopt_new()) == NULL) return NULL; /* Defaults for authorized_keys flags */ ret->permit_port_forwarding_flag = 1; ret->permit_agent_forwarding_flag = 1; ret->permit_x11_forwarding_flag = 1; ret->permit_pty_flag = 1; ret->permit_user_rc = 1; return ret; } /* * Parse and record a permitopen/permitlisten directive. * Return 0 on success. Return -1 on failure and sets *errstrp to error reason. */ static int handle_permit(const char **optsp, int allow_bare_port, char ***permitsp, size_t *npermitsp, const char **errstrp) { char *opt, *tmp, *cp, *host, **permits = *permitsp; size_t npermits = *npermitsp; const char *errstr = "unknown error"; if (npermits > SSH_AUTHOPT_PERMIT_MAX) { *errstrp = "too many permission directives"; return -1; } if ((opt = opt_dequote(optsp, &errstr)) == NULL) { return -1; } if (allow_bare_port && strchr(opt, ':') == NULL) { /* * Allow a bare port number in permitlisten to indicate a * listen_host wildcard. */ if (asprintf(&tmp, "*:%s", opt) == -1) { free(opt); *errstrp = "memory allocation failed"; return -1; } free(opt); opt = tmp; } if ((tmp = strdup(opt)) == NULL) { free(opt); *errstrp = "memory allocation failed"; return -1; } cp = tmp; /* validate syntax before recording it. */ host = hpdelim2(&cp, NULL); if (host == NULL || strlen(host) >= NI_MAXHOST) { free(tmp); free(opt); *errstrp = "invalid permission hostname"; return -1; } /* * don't want to use permitopen_port to avoid * dependency on channels.[ch] here. */ if (cp == NULL || (strcmp(cp, "*") != 0 && a2port(cp) <= 0)) { free(tmp); free(opt); *errstrp = "invalid permission port"; return -1; } /* XXX - add streamlocal support */ free(tmp); /* Record it */ if ((permits = recallocarray(permits, npermits, npermits + 1, sizeof(*permits))) == NULL) { free(opt); /* NB. don't update *permitsp if alloc fails */ *errstrp = "memory allocation failed"; return -1; } permits[npermits++] = opt; *permitsp = permits; *npermitsp = npermits; return 0; } struct sshauthopt * sshauthopt_parse(const char *opts, const char **errstrp) { char **oarray, *opt, *cp, *tmp; int r; struct sshauthopt *ret = NULL; const char *errstr = "unknown error"; uint64_t valid_before; size_t i, l; if (errstrp != NULL) *errstrp = NULL; if ((ret = sshauthopt_new_with_keys_defaults()) == NULL) goto alloc_fail; if (opts == NULL) return ret; while (*opts && *opts != ' ' && *opts != '\t') { /* flag options */ if ((r = opt_flag("restrict", 0, &opts)) != -1) { ret->restricted = 1; ret->permit_port_forwarding_flag = 0; ret->permit_agent_forwarding_flag = 0; ret->permit_x11_forwarding_flag = 0; ret->permit_pty_flag = 0; ret->permit_user_rc = 0; } else if ((r = opt_flag("cert-authority", 0, &opts)) != -1) { ret->cert_authority = r; } else if ((r = opt_flag("port-forwarding", 1, &opts)) != -1) { ret->permit_port_forwarding_flag = r == 1; } else if ((r = opt_flag("agent-forwarding", 1, &opts)) != -1) { ret->permit_agent_forwarding_flag = r == 1; } else if ((r = opt_flag("x11-forwarding", 1, &opts)) != -1) { ret->permit_x11_forwarding_flag = r == 1; } else if ((r = opt_flag("touch-required", 1, &opts)) != -1) { ret->no_require_user_presence = r != 1; /* NB. flip */ } else if ((r = opt_flag("verify-required", 1, &opts)) != -1) { ret->require_verify = r == 1; } else if ((r = opt_flag("pty", 1, &opts)) != -1) { ret->permit_pty_flag = r == 1; } else if ((r = opt_flag("user-rc", 1, &opts)) != -1) { ret->permit_user_rc = r == 1; } else if (opt_match(&opts, "command")) { if (ret->force_command != NULL) { errstr = "multiple \"command\" clauses"; goto fail; } ret->force_command = opt_dequote(&opts, &errstr); if (ret->force_command == NULL) goto fail; } else if (opt_match(&opts, "principals")) { if (ret->cert_principals != NULL) { errstr = "multiple \"principals\" clauses"; goto fail; } ret->cert_principals = opt_dequote(&opts, &errstr); if (ret->cert_principals == NULL) goto fail; } else if (opt_match(&opts, "from")) { if (ret->required_from_host_keys != NULL) { errstr = "multiple \"from\" clauses"; goto fail; } ret->required_from_host_keys = opt_dequote(&opts, &errstr); if (ret->required_from_host_keys == NULL) goto fail; } else if (opt_match(&opts, "expiry-time")) { if ((opt = opt_dequote(&opts, &errstr)) == NULL) goto fail; if (parse_absolute_time(opt, &valid_before) != 0 || valid_before == 0) { free(opt); errstr = "invalid expires time"; goto fail; } free(opt); if (ret->valid_before == 0 || valid_before < ret->valid_before) ret->valid_before = valid_before; } else if (opt_match(&opts, "environment")) { if (ret->nenv > SSH_AUTHOPT_ENV_MAX) { errstr = "too many environment strings"; goto fail; } if ((opt = opt_dequote(&opts, &errstr)) == NULL) goto fail; /* env name must be alphanumeric and followed by '=' */ if ((tmp = strchr(opt, '=')) == NULL) { free(opt); errstr = "invalid environment string"; goto fail; } if ((cp = strdup(opt)) == NULL) { free(opt); goto alloc_fail; } l = (size_t)(tmp - opt); cp[l] = '\0'; /* truncate at '=' */ if (!valid_env_name(cp)) { free(cp); free(opt); errstr = "invalid environment string"; goto fail; } /* Check for duplicates; XXX O(n*log(n)) */ for (i = 0; i < ret->nenv; i++) { if (strncmp(ret->env[i], cp, l) == 0 && ret->env[i][l] == '=') break; } free(cp); /* First match wins */ if (i >= ret->nenv) { /* Append it. */ oarray = ret->env; if ((ret->env = recallocarray(ret->env, ret->nenv, ret->nenv + 1, sizeof(*ret->env))) == NULL) { free(opt); /* put it back for cleanup */ ret->env = oarray; goto alloc_fail; } ret->env[ret->nenv++] = opt; opt = NULL; /* transferred */ } free(opt); } else if (opt_match(&opts, "permitopen")) { if (handle_permit(&opts, 0, &ret->permitopen, &ret->npermitopen, &errstr) != 0) goto fail; } else if (opt_match(&opts, "permitlisten")) { if (handle_permit(&opts, 1, &ret->permitlisten, &ret->npermitlisten, &errstr) != 0) goto fail; } else if (opt_match(&opts, "tunnel")) { if ((opt = opt_dequote(&opts, &errstr)) == NULL) goto fail; ret->force_tun_device = a2tun(opt, NULL); free(opt); if (ret->force_tun_device == SSH_TUNID_ERR) { errstr = "invalid tun device"; goto fail; } } /* * Skip the comma, and move to the next option * (or break out if there are no more). */ if (*opts == '\0' || *opts == ' ' || *opts == '\t') break; /* End of options. */ /* Anything other than a comma is an unknown option */ if (*opts != ',') { errstr = "unknown key option"; goto fail; } opts++; if (*opts == '\0') { errstr = "unexpected end-of-options"; goto fail; } } /* success */ if (errstrp != NULL) *errstrp = NULL; return ret; alloc_fail: errstr = "memory allocation failed"; fail: sshauthopt_free(ret); if (errstrp != NULL) *errstrp = errstr; return NULL; } struct sshauthopt * sshauthopt_from_cert(struct sshkey *k) { struct sshauthopt *ret; if (k == NULL || !sshkey_type_is_cert(k->type) || k->cert == NULL || k->cert->type != SSH2_CERT_TYPE_USER) return NULL; if ((ret = sshauthopt_new()) == NULL) return NULL; /* Handle options and critical extensions separately */ if (cert_option_list(ret, k->cert->critical, OPTIONS_CRITICAL, 1) == -1) { sshauthopt_free(ret); return NULL; } if (cert_option_list(ret, k->cert->extensions, OPTIONS_EXTENSIONS, 0) == -1) { sshauthopt_free(ret); return NULL; } /* success */ return ret; } /* * Merges "additional" options to "primary" and returns the result. * NB. Some options from primary have primacy. */ struct sshauthopt * sshauthopt_merge(const struct sshauthopt *primary, const struct sshauthopt *additional, const char **errstrp) { struct sshauthopt *ret; const char *errstr = "internal error"; const char *tmp; if (errstrp != NULL) *errstrp = NULL; if ((ret = sshauthopt_new()) == NULL) goto alloc_fail; /* cert_authority and cert_principals are cleared in result */ /* Prefer access lists from primary. */ /* XXX err is both set and mismatch? */ tmp = primary->required_from_host_cert; if (tmp == NULL) tmp = additional->required_from_host_cert; if (tmp != NULL && (ret->required_from_host_cert = strdup(tmp)) == NULL) goto alloc_fail; tmp = primary->required_from_host_keys; if (tmp == NULL) tmp = additional->required_from_host_keys; if (tmp != NULL && (ret->required_from_host_keys = strdup(tmp)) == NULL) goto alloc_fail; /* * force_tun_device, permitopen/permitlisten and environment all * prefer the primary. */ ret->force_tun_device = primary->force_tun_device; if (ret->force_tun_device == -1) ret->force_tun_device = additional->force_tun_device; if (primary->nenv > 0) { if (dup_strings(&ret->env, &ret->nenv, primary->env, primary->nenv) != 0) goto alloc_fail; } else if (additional->nenv) { if (dup_strings(&ret->env, &ret->nenv, additional->env, additional->nenv) != 0) goto alloc_fail; } if (primary->npermitopen > 0) { if (dup_strings(&ret->permitopen, &ret->npermitopen, primary->permitopen, primary->npermitopen) != 0) goto alloc_fail; } else if (additional->npermitopen > 0) { if (dup_strings(&ret->permitopen, &ret->npermitopen, additional->permitopen, additional->npermitopen) != 0) goto alloc_fail; } if (primary->npermitlisten > 0) { if (dup_strings(&ret->permitlisten, &ret->npermitlisten, primary->permitlisten, primary->npermitlisten) != 0) goto alloc_fail; } else if (additional->npermitlisten > 0) { if (dup_strings(&ret->permitlisten, &ret->npermitlisten, additional->permitlisten, additional->npermitlisten) != 0) goto alloc_fail; } #define OPTFLAG_AND(x) ret->x = (primary->x == 1) && (additional->x == 1) #define OPTFLAG_OR(x) ret->x = (primary->x == 1) || (additional->x == 1) /* Permissive flags are logical-AND (i.e. must be set in both) */ OPTFLAG_AND(permit_port_forwarding_flag); OPTFLAG_AND(permit_agent_forwarding_flag); OPTFLAG_AND(permit_x11_forwarding_flag); OPTFLAG_AND(permit_pty_flag); OPTFLAG_AND(permit_user_rc); OPTFLAG_AND(no_require_user_presence); /* Restrictive flags are logical-OR (i.e. must be set in either) */ OPTFLAG_OR(require_verify); #undef OPTFLAG_AND /* Earliest expiry time should win */ if (primary->valid_before != 0) ret->valid_before = primary->valid_before; if (additional->valid_before != 0 && additional->valid_before < ret->valid_before) ret->valid_before = additional->valid_before; /* * When both multiple forced-command are specified, only * proceed if they are identical, otherwise fail. */ if (primary->force_command != NULL && additional->force_command != NULL) { if (strcmp(primary->force_command, additional->force_command) == 0) { /* ok */ ret->force_command = strdup(primary->force_command); if (ret->force_command == NULL) goto alloc_fail; } else { errstr = "forced command options do not match"; goto fail; } } else if (primary->force_command != NULL) { if ((ret->force_command = strdup( primary->force_command)) == NULL) goto alloc_fail; } else if (additional->force_command != NULL) { if ((ret->force_command = strdup( additional->force_command)) == NULL) goto alloc_fail; } /* success */ if (errstrp != NULL) *errstrp = NULL; return ret; alloc_fail: errstr = "memory allocation failed"; fail: if (errstrp != NULL) *errstrp = errstr; sshauthopt_free(ret); return NULL; } /* * Copy options */ struct sshauthopt * sshauthopt_copy(const struct sshauthopt *orig) { struct sshauthopt *ret; if ((ret = sshauthopt_new()) == NULL) return NULL; #define OPTSCALAR(x) ret->x = orig->x OPTSCALAR(permit_port_forwarding_flag); OPTSCALAR(permit_agent_forwarding_flag); OPTSCALAR(permit_x11_forwarding_flag); OPTSCALAR(permit_pty_flag); OPTSCALAR(permit_user_rc); OPTSCALAR(restricted); OPTSCALAR(cert_authority); OPTSCALAR(force_tun_device); OPTSCALAR(valid_before); OPTSCALAR(no_require_user_presence); OPTSCALAR(require_verify); #undef OPTSCALAR #define OPTSTRING(x) \ do { \ if (orig->x != NULL && (ret->x = strdup(orig->x)) == NULL) { \ sshauthopt_free(ret); \ return NULL; \ } \ } while (0) OPTSTRING(cert_principals); OPTSTRING(force_command); OPTSTRING(required_from_host_cert); OPTSTRING(required_from_host_keys); #undef OPTSTRING if (dup_strings(&ret->env, &ret->nenv, orig->env, orig->nenv) != 0 || dup_strings(&ret->permitopen, &ret->npermitopen, orig->permitopen, orig->npermitopen) != 0 || dup_strings(&ret->permitlisten, &ret->npermitlisten, orig->permitlisten, orig->npermitlisten) != 0) { sshauthopt_free(ret); return NULL; } return ret; } static int serialise_array(struct sshbuf *m, char **a, size_t n) { struct sshbuf *b; size_t i; int r = SSH_ERR_INTERNAL_ERROR; if (n > INT_MAX) return SSH_ERR_INTERNAL_ERROR; if ((b = sshbuf_new()) == NULL) { return SSH_ERR_ALLOC_FAIL; } for (i = 0; i < n; i++) { if ((r = sshbuf_put_cstring(b, a[i])) != 0) goto out; } if ((r = sshbuf_put_u32(m, n)) != 0 || (r = sshbuf_put_stringb(m, b)) != 0) goto out; /* success */ r = 0; out: sshbuf_free(b); return r; } static int deserialise_array(struct sshbuf *m, char ***ap, size_t *np) { char **a = NULL; size_t i, n = 0; struct sshbuf *b = NULL; u_int tmp; int r = SSH_ERR_INTERNAL_ERROR; if ((r = sshbuf_get_u32(m, &tmp)) != 0 || (r = sshbuf_froms(m, &b)) != 0) goto out; if (tmp > INT_MAX) { r = SSH_ERR_INVALID_FORMAT; goto out; } n = tmp; if (n > 0 && (a = calloc(n, sizeof(*a))) == NULL) { r = SSH_ERR_ALLOC_FAIL; goto out; } for (i = 0; i < n; i++) { if ((r = sshbuf_get_cstring(b, &a[i], NULL)) != 0) goto out; } /* success */ r = 0; *ap = a; a = NULL; *np = n; n = 0; out: if (a != NULL) { for (i = 0; i < n; i++) free(a[i]); free(a); } sshbuf_free(b); return r; } static int serialise_nullable_string(struct sshbuf *m, const char *s) { int r; if ((r = sshbuf_put_u8(m, s == NULL)) != 0 || (r = sshbuf_put_cstring(m, s)) != 0) return r; return 0; } static int deserialise_nullable_string(struct sshbuf *m, char **sp) { int r; u_char flag; *sp = NULL; if ((r = sshbuf_get_u8(m, &flag)) != 0 || (r = sshbuf_get_cstring(m, flag ? NULL : sp, NULL)) != 0) return r; return 0; } int sshauthopt_serialise(const struct sshauthopt *opts, struct sshbuf *m, int untrusted) { int r = SSH_ERR_INTERNAL_ERROR; /* Flag options */ if ((r = sshbuf_put_u8(m, opts->permit_port_forwarding_flag)) != 0 || (r = sshbuf_put_u8(m, opts->permit_agent_forwarding_flag)) != 0 || (r = sshbuf_put_u8(m, opts->permit_x11_forwarding_flag)) != 0 || (r = sshbuf_put_u8(m, opts->permit_pty_flag)) != 0 || (r = sshbuf_put_u8(m, opts->permit_user_rc)) != 0 || (r = sshbuf_put_u8(m, opts->restricted)) != 0 || (r = sshbuf_put_u8(m, opts->cert_authority)) != 0 || (r = sshbuf_put_u8(m, opts->no_require_user_presence)) != 0 || (r = sshbuf_put_u8(m, opts->require_verify)) != 0) return r; /* Simple integer options */ if ((r = sshbuf_put_u64(m, opts->valid_before)) != 0) return r; /* tunnel number can be negative to indicate "unset" */ if ((r = sshbuf_put_u8(m, opts->force_tun_device == -1)) != 0 || (r = sshbuf_put_u32(m, (opts->force_tun_device < 0) ? 0 : (u_int)opts->force_tun_device)) != 0) return r; /* String options; these may be NULL */ if ((r = serialise_nullable_string(m, untrusted ? "yes" : opts->cert_principals)) != 0 || (r = serialise_nullable_string(m, untrusted ? "true" : opts->force_command)) != 0 || (r = serialise_nullable_string(m, untrusted ? NULL : opts->required_from_host_cert)) != 0 || (r = serialise_nullable_string(m, untrusted ? NULL : opts->required_from_host_keys)) != 0) return r; /* Array options */ if ((r = serialise_array(m, opts->env, untrusted ? 0 : opts->nenv)) != 0 || (r = serialise_array(m, opts->permitopen, untrusted ? 0 : opts->npermitopen)) != 0 || (r = serialise_array(m, opts->permitlisten, untrusted ? 0 : opts->npermitlisten)) != 0) return r; /* success */ return 0; } int sshauthopt_deserialise(struct sshbuf *m, struct sshauthopt **optsp) { struct sshauthopt *opts = NULL; int r = SSH_ERR_INTERNAL_ERROR; u_char f; u_int tmp; if ((opts = calloc(1, sizeof(*opts))) == NULL) return SSH_ERR_ALLOC_FAIL; /* Flag options */ #define OPT_FLAG(x) \ do { \ if ((r = sshbuf_get_u8(m, &f)) != 0) \ goto out; \ opts->x = f; \ } while (0) OPT_FLAG(permit_port_forwarding_flag); OPT_FLAG(permit_agent_forwarding_flag); OPT_FLAG(permit_x11_forwarding_flag); OPT_FLAG(permit_pty_flag); OPT_FLAG(permit_user_rc); OPT_FLAG(restricted); OPT_FLAG(cert_authority); OPT_FLAG(no_require_user_presence); OPT_FLAG(require_verify); #undef OPT_FLAG /* Simple integer options */ if ((r = sshbuf_get_u64(m, &opts->valid_before)) != 0) goto out; /* tunnel number can be negative to indicate "unset" */ if ((r = sshbuf_get_u8(m, &f)) != 0 || (r = sshbuf_get_u32(m, &tmp)) != 0) goto out; opts->force_tun_device = f ? -1 : (int)tmp; /* String options may be NULL */ if ((r = deserialise_nullable_string(m, &opts->cert_principals)) != 0 || (r = deserialise_nullable_string(m, &opts->force_command)) != 0 || (r = deserialise_nullable_string(m, &opts->required_from_host_cert)) != 0 || (r = deserialise_nullable_string(m, &opts->required_from_host_keys)) != 0) goto out; /* Array options */ if ((r = deserialise_array(m, &opts->env, &opts->nenv)) != 0 || (r = deserialise_array(m, &opts->permitopen, &opts->npermitopen)) != 0 || (r = deserialise_array(m, &opts->permitlisten, &opts->npermitlisten)) != 0) goto out; /* success */ r = 0; *optsp = opts; opts = NULL; out: sshauthopt_free(opts); return r; }