Index: head/lib/libfetch/common.c =================================================================== --- head/lib/libfetch/common.c (revision 341012) +++ head/lib/libfetch/common.c (revision 341013) @@ -1,1518 +1,1518 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1998-2016 Dag-Erling Smørgrav * Copyright (c) 2013 Michael Gmelin * 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 * in this position and unchanged. * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef WITH_SSL #include #endif #include "fetch.h" #include "common.h" /*** Local data **************************************************************/ /* * Error messages for resolver errors */ static struct fetcherr netdb_errlist[] = { #ifdef EAI_NODATA { EAI_NODATA, FETCH_RESOLV, "Host not found" }, #endif { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, { EAI_NONAME, FETCH_RESOLV, "No address record" }, { -1, FETCH_UNKNOWN, "Unknown resolver error" } }; /* End-of-Line */ static const char ENDL[2] = "\r\n"; /*** Error-reporting functions ***********************************************/ /* * Map error code to string */ static struct fetcherr * fetch_finderr(struct fetcherr *p, int e) { while (p->num != -1 && p->num != e) p++; return (p); } /* * Set error code */ void fetch_seterr(struct fetcherr *p, int e) { p = fetch_finderr(p, e); fetchLastErrCode = p->cat; snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); } /* * Set error code according to errno */ void fetch_syserr(void) { switch (errno) { case 0: fetchLastErrCode = FETCH_OK; break; case EPERM: case EACCES: case EROFS: case EAUTH: case ENEEDAUTH: fetchLastErrCode = FETCH_AUTH; break; case ENOENT: case EISDIR: /* XXX */ fetchLastErrCode = FETCH_UNAVAIL; break; case ENOMEM: fetchLastErrCode = FETCH_MEMORY; break; case EBUSY: case EAGAIN: fetchLastErrCode = FETCH_TEMP; break; case EEXIST: fetchLastErrCode = FETCH_EXISTS; break; case ENOSPC: fetchLastErrCode = FETCH_FULL; break; case EADDRINUSE: case EADDRNOTAVAIL: case ENETDOWN: case ENETUNREACH: case ENETRESET: case EHOSTUNREACH: fetchLastErrCode = FETCH_NETWORK; break; case ECONNABORTED: case ECONNRESET: fetchLastErrCode = FETCH_ABORT; break; case ETIMEDOUT: fetchLastErrCode = FETCH_TIMEOUT; break; case ECONNREFUSED: case EHOSTDOWN: fetchLastErrCode = FETCH_DOWN; break; default: fetchLastErrCode = FETCH_UNKNOWN; } snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); } /* * Emit status message */ void fetch_info(const char *fmt, ...) { va_list ap; va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fputc('\n', stderr); } /*** Network-related utility functions ***************************************/ /* * Return the default port for a scheme */ int fetch_default_port(const char *scheme) { struct servent *se; if ((se = getservbyname(scheme, "tcp")) != NULL) return (ntohs(se->s_port)); - if (strcasecmp(scheme, SCHEME_FTP) == 0) + if (strcmp(scheme, SCHEME_FTP) == 0) return (FTP_DEFAULT_PORT); - if (strcasecmp(scheme, SCHEME_HTTP) == 0) + if (strcmp(scheme, SCHEME_HTTP) == 0) return (HTTP_DEFAULT_PORT); return (0); } /* * Return the default proxy port for a scheme */ int fetch_default_proxy_port(const char *scheme) { - if (strcasecmp(scheme, SCHEME_FTP) == 0) + if (strcmp(scheme, SCHEME_FTP) == 0) return (FTP_DEFAULT_PROXY_PORT); - if (strcasecmp(scheme, SCHEME_HTTP) == 0) + if (strcmp(scheme, SCHEME_HTTP) == 0) return (HTTP_DEFAULT_PROXY_PORT); return (0); } /* * Create a connection for an existing descriptor. */ conn_t * fetch_reopen(int sd) { conn_t *conn; int opt = 1; /* allocate and fill connection structure */ if ((conn = calloc(1, sizeof(*conn))) == NULL) return (NULL); fcntl(sd, F_SETFD, FD_CLOEXEC); setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt); conn->sd = sd; ++conn->ref; return (conn); } /* * Bump a connection's reference count. */ conn_t * fetch_ref(conn_t *conn) { ++conn->ref; return (conn); } /* * Resolve an address */ struct addrinfo * fetch_resolve(const char *addr, int port, int af) { char hbuf[256], sbuf[8]; struct addrinfo hints, *res; const char *hb, *he, *sep; const char *host, *service; int err, len; /* first, check for a bracketed IPv6 address */ if (*addr == '[') { hb = addr + 1; if ((sep = strchr(hb, ']')) == NULL) { errno = EINVAL; goto syserr; } he = sep++; } else { hb = addr; sep = strchrnul(hb, ':'); he = sep; } /* see if we need to copy the host name */ if (*he != '\0') { len = snprintf(hbuf, sizeof(hbuf), "%.*s", (int)(he - hb), hb); if (len < 0) goto syserr; if (len >= (int)sizeof(hbuf)) { errno = ENAMETOOLONG; goto syserr; } host = hbuf; } else { host = hb; } /* was it followed by a service name? */ if (*sep == '\0' && port != 0) { if (port < 1 || port > 65535) { errno = EINVAL; goto syserr; } if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0) goto syserr; service = sbuf; } else if (*sep != '\0') { service = sep + 1; } else { service = NULL; } /* resolve */ memset(&hints, 0, sizeof(hints)); hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_ADDRCONFIG; if ((err = getaddrinfo(host, service, &hints, &res)) != 0) { netdb_seterr(err); return (NULL); } return (res); syserr: fetch_syserr(); return (NULL); } /* * Bind a socket to a specific local address */ int fetch_bind(int sd, int af, const char *addr) { struct addrinfo *cliai, *ai; int err; if ((cliai = fetch_resolve(addr, 0, af)) == NULL) return (-1); for (ai = cliai; ai != NULL; ai = ai->ai_next) if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0) break; if (err != 0) fetch_syserr(); freeaddrinfo(cliai); return (err == 0 ? 0 : -1); } /* * Establish a TCP connection to the specified port on the specified host. */ conn_t * fetch_connect(const char *host, int port, int af, int verbose) { struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai; const char *bindaddr; conn_t *conn = NULL; int err = 0, sd = -1; DEBUGF("---> %s:%d\n", host, port); /* resolve server address */ if (verbose) fetch_info("resolving server address: %s:%d", host, port); if ((sais = fetch_resolve(host, port, af)) == NULL) goto fail; /* resolve client address */ bindaddr = getenv("FETCH_BIND_ADDRESS"); if (bindaddr != NULL && *bindaddr != '\0') { if (verbose) fetch_info("resolving client address: %s", bindaddr); if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL) goto fail; } /* try each server address in turn */ for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) { /* open socket */ if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0) goto syserr; /* attempt to bind to client address */ for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) { if (cai->ai_family != sai->ai_family) continue; if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0) break; } if (err != 0) { if (verbose) fetch_info("failed to bind to %s", bindaddr); goto syserr; } /* attempt to connect to server address */ if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0) break; /* clean up before next attempt */ close(sd); sd = -1; } if (err != 0) { if (verbose) fetch_info("failed to connect to %s:%d", host, port); goto syserr; } if ((conn = fetch_reopen(sd)) == NULL) goto syserr; if (cais != NULL) freeaddrinfo(cais); if (sais != NULL) freeaddrinfo(sais); return (conn); syserr: fetch_syserr(); goto fail; fail: if (sd >= 0) close(sd); if (cais != NULL) freeaddrinfo(cais); if (sais != NULL) freeaddrinfo(sais); return (NULL); } #ifdef WITH_SSL /* * Convert characters A-Z to lowercase (intentionally avoid any locale * specific conversions). */ static char fetch_ssl_tolower(char in) { if (in >= 'A' && in <= 'Z') return (in + 32); else return (in); } /* * isalpha implementation that intentionally avoids any locale specific * conversions. */ static int fetch_ssl_isalpha(char in) { return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z')); } /* * Check if passed hostnames a and b are equal. */ static int fetch_ssl_hname_equal(const char *a, size_t alen, const char *b, size_t blen) { size_t i; if (alen != blen) return (0); for (i = 0; i < alen; ++i) { if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i])) return (0); } return (1); } /* * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha- * numeric characters. Double hyphens (like they're found in IDN a-labels * 'xn--') are not allowed. Empty labels are invalid. */ static int fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok) { size_t i; if (!len || l[0] == '-' || l[len-1] == '-') return (0); for (i = 0; i < len; ++i) { if (!isdigit(l[i]) && !fetch_ssl_isalpha(l[i]) && !(l[i] == '*' && wcok) && !(l[i] == '-' && l[i - 1] != '-')) return (0); } return (1); } /* * Check if host name consists only of numbers. This might indicate an IP * address, which is not a good idea for CN wildcard comparison. */ static int fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len) { size_t i; for (i = 0; i < len; ++i) { if (!((hostname[i] >= '0' && hostname[i] <= '9') || hostname[i] == '.')) return (0); } return (1); } /* * Check if the host name h passed matches the pattern passed in m which * is usually part of subjectAltName or CN of a certificate presented to * the client. This includes wildcard matching. The algorithm is based on * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280. */ static int fetch_ssl_hname_match(const char *h, size_t hlen, const char *m, size_t mlen) { int delta, hdotidx, mdot1idx, wcidx; const char *hdot, *mdot1, *mdot2; const char *wc; /* wildcard */ if (!(h && *h && m && *m)) return (0); if ((wc = strnstr(m, "*", mlen)) == NULL) return (fetch_ssl_hname_equal(h, hlen, m, mlen)); wcidx = wc - m; /* hostname should not be just dots and numbers */ if (fetch_ssl_hname_is_only_numbers(h, hlen)) return (0); /* only one wildcard allowed in pattern */ if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL) return (0); /* * there must be at least two more domain labels and * wildcard has to be in the leftmost label (RFC6125) */ mdot1 = strnstr(m, ".", mlen); if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4) return (0); mdot1idx = mdot1 - m; mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1); if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2) return (0); /* hostname must contain a dot and not be the 1st char */ hdot = strnstr(h, ".", hlen); if (hdot == NULL || hdot == h) return (0); hdotidx = hdot - h; /* * host part of hostname must be at least as long as * pattern it's supposed to match */ if (hdotidx < mdot1idx) return (0); /* * don't allow wildcards in non-traditional domain names * (IDN, A-label, U-label...) */ if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) || !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1)) return (0); /* match domain part (part after first dot) */ if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1, mlen - mdot1idx)) return (0); /* match part left of wildcard */ if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx)) return (0); /* match part right of wildcard */ delta = mdot1idx - wcidx - 1; if (!fetch_ssl_hname_equal(hdot - delta, delta, mdot1 - delta, delta)) return (0); /* all tests succeeded, it's a match */ return (1); } /* * Get numeric host address info - returns NULL if host was not an IP * address. The caller is responsible for deallocation using * freeaddrinfo(3). */ static struct addrinfo * fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len) { struct addrinfo hints, *res; char *host; host = (char *)malloc(len + 1); memcpy(host, hostname, len); host[len] = '\0'; memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = 0; hints.ai_flags = AI_NUMERICHOST; /* port is not relevant for this purpose */ if (getaddrinfo(host, "443", &hints, &res) != 0) res = NULL; free(host); return res; } /* * Compare ip address in addrinfo with address passes. */ static int fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost, size_t rhostlen) { const void *left; if (lhost->ai_family == AF_INET && rhostlen == 4) { left = (void *)&((struct sockaddr_in*)(void *) lhost->ai_addr)->sin_addr.s_addr; #ifdef INET6 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) { left = (void *)&((struct sockaddr_in6 *)(void *) lhost->ai_addr)->sin6_addr; #endif } else return (0); return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0); } /* * Compare ip address in addrinfo with host passed. If host is not an IP * address, comparison will fail. */ static int fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r, size_t rlen) { struct addrinfo *raddr; int ret; char *rip; ret = 0; if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL) return 0; /* not a numeric host */ if (laddr->ai_family == raddr->ai_family) { if (laddr->ai_family == AF_INET) { rip = (char *)&((struct sockaddr_in *)(void *) raddr->ai_addr)->sin_addr.s_addr; ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4); #ifdef INET6 } else if (laddr->ai_family == AF_INET6) { rip = (char *)&((struct sockaddr_in6 *)(void *) raddr->ai_addr)->sin6_addr; ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16); #endif } } freeaddrinfo(raddr); return (ret); } /* * Verify server certificate by subjectAltName. */ static int fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames, const char *host, struct addrinfo *ip) { const GENERAL_NAME *name; size_t nslen; int i; const char *ns; for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) { #if OPENSSL_VERSION_NUMBER < 0x10000000L /* * This is a workaround, since the following line causes * alignment issues in clang: * name = sk_GENERAL_NAME_value(altnames, i); * OpenSSL explicitly warns not to use those macros * directly, but there isn't much choice (and there * shouldn't be any ill side effects) */ name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i); #else name = sk_GENERAL_NAME_value(altnames, i); #endif #if OPENSSL_VERSION_NUMBER < 0x10100000L ns = (const char *)ASN1_STRING_data(name->d.ia5); #else ns = (const char *)ASN1_STRING_get0_data(name->d.ia5); #endif nslen = (size_t)ASN1_STRING_length(name->d.ia5); if (name->type == GEN_DNS && ip == NULL && fetch_ssl_hname_match(host, strlen(host), ns, nslen)) return (1); else if (name->type == GEN_IPADD && ip != NULL && fetch_ssl_ipaddr_match_bin(ip, ns, nslen)) return (1); } return (0); } /* * Verify server certificate by CN. */ static int fetch_ssl_verify_cn(X509_NAME *subject, const char *host, struct addrinfo *ip) { ASN1_STRING *namedata; X509_NAME_ENTRY *nameentry; int cnlen, lastpos, loc, ret; unsigned char *cn; ret = 0; lastpos = -1; loc = -1; cn = NULL; /* get most specific CN (last entry in list) and compare */ while ((lastpos = X509_NAME_get_index_by_NID(subject, NID_commonName, lastpos)) != -1) loc = lastpos; if (loc > -1) { nameentry = X509_NAME_get_entry(subject, loc); namedata = X509_NAME_ENTRY_get_data(nameentry); cnlen = ASN1_STRING_to_UTF8(&cn, namedata); if (ip == NULL && fetch_ssl_hname_match(host, strlen(host), cn, cnlen)) ret = 1; else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen)) ret = 1; OPENSSL_free(cn); } return (ret); } /* * Verify that server certificate subjectAltName/CN matches * hostname. First check, if there are alternative subject names. If yes, * those have to match. Only if those don't exist it falls back to * checking the subject's CN. */ static int fetch_ssl_verify_hname(X509 *cert, const char *host) { struct addrinfo *ip; STACK_OF(GENERAL_NAME) *altnames; X509_NAME *subject; int ret; ret = 0; ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host)); altnames = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL); if (altnames != NULL) { ret = fetch_ssl_verify_altname(altnames, host, ip); } else { subject = X509_get_subject_name(cert); if (subject != NULL) ret = fetch_ssl_verify_cn(subject, host, ip); } if (ip != NULL) freeaddrinfo(ip); if (altnames != NULL) GENERAL_NAMES_free(altnames); return (ret); } /* * Configure transport security layer based on environment. */ static void fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose) { long ssl_ctx_options; ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET; if (getenv("SSL_ALLOW_SSL3") == NULL) ssl_ctx_options |= SSL_OP_NO_SSLv3; if (getenv("SSL_NO_TLS1") != NULL) ssl_ctx_options |= SSL_OP_NO_TLSv1; if (getenv("SSL_NO_TLS1_1") != NULL) ssl_ctx_options |= SSL_OP_NO_TLSv1_1; if (getenv("SSL_NO_TLS1_2") != NULL) ssl_ctx_options |= SSL_OP_NO_TLSv1_2; if (verbose) fetch_info("SSL options: %lx", ssl_ctx_options); SSL_CTX_set_options(ctx, ssl_ctx_options); } /* * Configure peer verification based on environment. */ #define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem" #define BASE_CERT_FILE "/etc/ssl/cert.pem" static int fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose) { X509_LOOKUP *crl_lookup; X509_STORE *crl_store; const char *ca_cert_file, *ca_cert_path, *crl_file; if (getenv("SSL_NO_VERIFY_PEER") == NULL) { ca_cert_file = getenv("SSL_CA_CERT_FILE"); if (ca_cert_file == NULL && access(LOCAL_CERT_FILE, R_OK) == 0) ca_cert_file = LOCAL_CERT_FILE; if (ca_cert_file == NULL && access(BASE_CERT_FILE, R_OK) == 0) ca_cert_file = BASE_CERT_FILE; ca_cert_path = getenv("SSL_CA_CERT_PATH"); if (verbose) { fetch_info("Peer verification enabled"); if (ca_cert_file != NULL) fetch_info("Using CA cert file: %s", ca_cert_file); if (ca_cert_path != NULL) fetch_info("Using CA cert path: %s", ca_cert_path); if (ca_cert_file == NULL && ca_cert_path == NULL) fetch_info("Using OpenSSL default " "CA cert file and path"); } SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, fetch_ssl_cb_verify_crt); if (ca_cert_file != NULL || ca_cert_path != NULL) SSL_CTX_load_verify_locations(ctx, ca_cert_file, ca_cert_path); else SSL_CTX_set_default_verify_paths(ctx); if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) { if (verbose) fetch_info("Using CRL file: %s", crl_file); crl_store = SSL_CTX_get_cert_store(ctx); crl_lookup = X509_STORE_add_lookup(crl_store, X509_LOOKUP_file()); if (crl_lookup == NULL || !X509_load_crl_file(crl_lookup, crl_file, X509_FILETYPE_PEM)) { fprintf(stderr, "Could not load CRL file %s\n", crl_file); return (0); } X509_STORE_set_flags(crl_store, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL); } } return (1); } /* * Configure client certificate based on environment. */ static int fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose) { const char *client_cert_file, *client_key_file; if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) { client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ? getenv("SSL_CLIENT_KEY_FILE") : client_cert_file; if (verbose) { fetch_info("Using client cert file: %s", client_cert_file); fetch_info("Using client key file: %s", client_key_file); } if (SSL_CTX_use_certificate_chain_file(ctx, client_cert_file) != 1) { fprintf(stderr, "Could not load client certificate %s\n", client_cert_file); return (0); } if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file, SSL_FILETYPE_PEM) != 1) { fprintf(stderr, "Could not load client key %s\n", client_key_file); return (0); } } return (1); } /* * Callback for SSL certificate verification, this is called on server * cert verification. It takes no decision, but informs the user in case * verification failed. */ int fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx) { X509 *crt; X509_NAME *name; char *str; str = NULL; if (!verified) { if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL && (name = X509_get_subject_name(crt)) != NULL) str = X509_NAME_oneline(name, 0, 0); fprintf(stderr, "Certificate verification failed for %s\n", str != NULL ? str : "no relevant certificate"); OPENSSL_free(str); } return (verified); } #endif /* * Enable SSL on a connection. */ int fetch_ssl(conn_t *conn, const struct url *URL, int verbose) { #ifdef WITH_SSL int ret, ssl_err; X509_NAME *name; char *str; /* Init the SSL library and context */ if (!SSL_library_init()){ fprintf(stderr, "SSL library init failed\n"); return (-1); } SSL_load_error_strings(); conn->ssl_meth = SSLv23_client_method(); conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose); if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose)) return (-1); if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose)) return (-1); conn->ssl = SSL_new(conn->ssl_ctx); if (conn->ssl == NULL) { fprintf(stderr, "SSL context creation failed\n"); return (-1); } SSL_set_fd(conn->ssl, conn->sd); #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT) if (!SSL_set_tlsext_host_name(conn->ssl, __DECONST(struct url *, URL)->host)) { fprintf(stderr, "TLS server name indication extension failed for host %s\n", URL->host); return (-1); } #endif while ((ret = SSL_connect(conn->ssl)) == -1) { ssl_err = SSL_get_error(conn->ssl, ret); if (ssl_err != SSL_ERROR_WANT_READ && ssl_err != SSL_ERROR_WANT_WRITE) { ERR_print_errors_fp(stderr); return (-1); } } conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); if (conn->ssl_cert == NULL) { fprintf(stderr, "No server SSL certificate\n"); return (-1); } if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) { if (verbose) fetch_info("Verify hostname"); if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) { fprintf(stderr, "SSL certificate subject doesn't match host %s\n", URL->host); return (-1); } } if (verbose) { fetch_info("%s connection established using %s", SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl)); name = X509_get_subject_name(conn->ssl_cert); str = X509_NAME_oneline(name, 0, 0); fetch_info("Certificate subject: %s", str); OPENSSL_free(str); name = X509_get_issuer_name(conn->ssl_cert); str = X509_NAME_oneline(name, 0, 0); fetch_info("Certificate issuer: %s", str); OPENSSL_free(str); } return (0); #else (void)conn; (void)verbose; fprintf(stderr, "SSL support disabled\n"); return (-1); #endif } #define FETCH_READ_WAIT -2 #define FETCH_READ_ERROR -1 #define FETCH_READ_DONE 0 #ifdef WITH_SSL static ssize_t fetch_ssl_read(SSL *ssl, char *buf, size_t len) { ssize_t rlen; int ssl_err; rlen = SSL_read(ssl, buf, len); if (rlen < 0) { ssl_err = SSL_get_error(ssl, rlen); if (ssl_err == SSL_ERROR_WANT_READ || ssl_err == SSL_ERROR_WANT_WRITE) { return (FETCH_READ_WAIT); } else { ERR_print_errors_fp(stderr); return (FETCH_READ_ERROR); } } return (rlen); } #endif static ssize_t fetch_socket_read(int sd, char *buf, size_t len) { ssize_t rlen; rlen = read(sd, buf, len); if (rlen < 0) { if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls)) return (FETCH_READ_WAIT); else return (FETCH_READ_ERROR); } return (rlen); } /* * Read a character from a connection w/ timeout */ ssize_t fetch_read(conn_t *conn, char *buf, size_t len) { struct timeval now, timeout, delta; struct pollfd pfd; ssize_t rlen; int deltams; if (fetchTimeout > 0) { gettimeofday(&timeout, NULL); timeout.tv_sec += fetchTimeout; } deltams = INFTIM; memset(&pfd, 0, sizeof pfd); pfd.fd = conn->sd; pfd.events = POLLIN | POLLERR; for (;;) { /* * The socket is non-blocking. Instead of the canonical * poll() -> read(), we do the following: * * 1) call read() or SSL_read(). * 2) if we received some data, return it. * 3) if an error occurred, return -1. * 4) if read() or SSL_read() signaled EOF, return. * 5) if we did not receive any data but we're not at EOF, * call poll(). * * In the SSL case, this is necessary because if we * receive a close notification, we have to call * SSL_read() one additional time after we've read * everything we received. * * In the non-SSL case, it may improve performance (very * slightly) when reading small amounts of data. */ #ifdef WITH_SSL if (conn->ssl != NULL) rlen = fetch_ssl_read(conn->ssl, buf, len); else #endif rlen = fetch_socket_read(conn->sd, buf, len); if (rlen >= 0) { break; } else if (rlen == FETCH_READ_ERROR) { fetch_syserr(); return (-1); } // assert(rlen == FETCH_READ_WAIT); if (fetchTimeout > 0) { gettimeofday(&now, NULL); if (!timercmp(&timeout, &now, >)) { errno = ETIMEDOUT; fetch_syserr(); return (-1); } timersub(&timeout, &now, &delta); deltams = delta.tv_sec * 1000 + delta.tv_usec / 1000;; } errno = 0; pfd.revents = 0; if (poll(&pfd, 1, deltams) < 0) { if (errno == EINTR && fetchRestartCalls) continue; fetch_syserr(); return (-1); } } return (rlen); } /* * Read a line of text from a connection w/ timeout */ #define MIN_BUF_SIZE 1024 int fetch_getln(conn_t *conn) { char *tmp; size_t tmpsize; ssize_t len; char c; if (conn->buf == NULL) { if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { errno = ENOMEM; return (-1); } conn->bufsize = MIN_BUF_SIZE; } conn->buf[0] = '\0'; conn->buflen = 0; do { len = fetch_read(conn, &c, 1); if (len == -1) return (-1); if (len == 0) break; conn->buf[conn->buflen++] = c; if (conn->buflen == conn->bufsize) { tmp = conn->buf; tmpsize = conn->bufsize * 2 + 1; if ((tmp = realloc(tmp, tmpsize)) == NULL) { errno = ENOMEM; return (-1); } conn->buf = tmp; conn->bufsize = tmpsize; } } while (c != '\n'); conn->buf[conn->buflen] = '\0'; DEBUGF("<<< %s", conn->buf); return (0); } /* * Write to a connection w/ timeout */ ssize_t fetch_write(conn_t *conn, const char *buf, size_t len) { struct iovec iov; iov.iov_base = __DECONST(char *, buf); iov.iov_len = len; return fetch_writev(conn, &iov, 1); } /* * Write a vector to a connection w/ timeout * Note: can modify the iovec. */ ssize_t fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) { struct timeval now, timeout, delta; struct pollfd pfd; ssize_t wlen, total; int deltams; memset(&pfd, 0, sizeof pfd); if (fetchTimeout) { pfd.fd = conn->sd; pfd.events = POLLOUT | POLLERR; gettimeofday(&timeout, NULL); timeout.tv_sec += fetchTimeout; } total = 0; while (iovcnt > 0) { while (fetchTimeout && pfd.revents == 0) { gettimeofday(&now, NULL); if (!timercmp(&timeout, &now, >)) { errno = ETIMEDOUT; fetch_syserr(); return (-1); } timersub(&timeout, &now, &delta); deltams = delta.tv_sec * 1000 + delta.tv_usec / 1000; errno = 0; pfd.revents = 0; if (poll(&pfd, 1, deltams) < 0) { /* POSIX compliance */ if (errno == EAGAIN) continue; if (errno == EINTR && fetchRestartCalls) continue; return (-1); } } errno = 0; #ifdef WITH_SSL if (conn->ssl != NULL) wlen = SSL_write(conn->ssl, iov->iov_base, iov->iov_len); else #endif wlen = writev(conn->sd, iov, iovcnt); if (wlen == 0) { /* we consider a short write a failure */ /* XXX perhaps we shouldn't in the SSL case */ errno = EPIPE; fetch_syserr(); return (-1); } if (wlen < 0) { if (errno == EINTR && fetchRestartCalls) continue; return (-1); } total += wlen; while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { wlen -= iov->iov_len; iov++; iovcnt--; } if (iovcnt > 0) { iov->iov_len -= wlen; iov->iov_base = __DECONST(char *, iov->iov_base) + wlen; } } return (total); } /* * Write a line of text to a connection w/ timeout */ int fetch_putln(conn_t *conn, const char *str, size_t len) { struct iovec iov[2]; int ret; DEBUGF(">>> %s\n", str); iov[0].iov_base = __DECONST(char *, str); iov[0].iov_len = len; iov[1].iov_base = __DECONST(char *, ENDL); iov[1].iov_len = sizeof(ENDL); if (len == 0) ret = fetch_writev(conn, &iov[1], 1); else ret = fetch_writev(conn, iov, 2); if (ret == -1) return (-1); return (0); } /* * Close connection */ int fetch_close(conn_t *conn) { int ret; if (--conn->ref > 0) return (0); #ifdef WITH_SSL if (conn->ssl) { SSL_shutdown(conn->ssl); SSL_set_connect_state(conn->ssl); SSL_free(conn->ssl); conn->ssl = NULL; } if (conn->ssl_ctx) { SSL_CTX_free(conn->ssl_ctx); conn->ssl_ctx = NULL; } if (conn->ssl_cert) { X509_free(conn->ssl_cert); conn->ssl_cert = NULL; } #endif ret = close(conn->sd); free(conn->buf); free(conn); return (ret); } /*** Directory-related utility functions *************************************/ int fetch_add_entry(struct url_ent **p, int *size, int *len, const char *name, struct url_stat *us) { struct url_ent *tmp; if (*p == NULL) { *size = 0; *len = 0; } if (*len >= *size - 1) { tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p)); if (tmp == NULL) { errno = ENOMEM; fetch_syserr(); return (-1); } *size = (*size * 2 + 1); *p = tmp; } tmp = *p + *len; snprintf(tmp->name, PATH_MAX, "%s", name); memcpy(&tmp->stat, us, sizeof(*us)); (*len)++; (++tmp)->name[0] = 0; return (0); } /*** Authentication-related utility functions ********************************/ static const char * fetch_read_word(FILE *f) { static char word[1024]; if (fscanf(f, " %1023s ", word) != 1) return (NULL); return (word); } static int fetch_netrc_open(void) { struct passwd *pwd; char fn[PATH_MAX]; const char *p; int fd, serrno; if ((p = getenv("NETRC")) != NULL) { DEBUGF("NETRC=%s\n", p); if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { fetch_info("$NETRC specifies a file name " "longer than PATH_MAX"); return (-1); } } else { if ((p = getenv("HOME")) == NULL) { if ((pwd = getpwuid(getuid())) == NULL || (p = pwd->pw_dir) == NULL) return (-1); } if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) return (-1); } if ((fd = open(fn, O_RDONLY)) < 0) { serrno = errno; DEBUGF("%s: %s\n", fn, strerror(serrno)); errno = serrno; } return (fd); } /* * Get authentication data for a URL from .netrc */ int fetch_netrc_auth(struct url *url) { const char *word; int serrno; FILE *f; if (url->netrcfd < 0) url->netrcfd = fetch_netrc_open(); if (url->netrcfd < 0) return (-1); if ((f = fdopen(url->netrcfd, "r")) == NULL) { serrno = errno; DEBUGF("fdopen(netrcfd): %s", strerror(errno)); close(url->netrcfd); url->netrcfd = -1; errno = serrno; return (-1); } rewind(f); DEBUGF("searching netrc for %s\n", url->host); while ((word = fetch_read_word(f)) != NULL) { if (strcmp(word, "default") == 0) { DEBUGF("using default netrc settings\n"); break; } if (strcmp(word, "machine") == 0 && (word = fetch_read_word(f)) != NULL && strcasecmp(word, url->host) == 0) { DEBUGF("using netrc settings for %s\n", word); break; } } if (word == NULL) goto ferr; while ((word = fetch_read_word(f)) != NULL) { if (strcmp(word, "login") == 0) { if ((word = fetch_read_word(f)) == NULL) goto ferr; if (snprintf(url->user, sizeof(url->user), "%s", word) > (int)sizeof(url->user)) { fetch_info("login name in .netrc is too long"); url->user[0] = '\0'; } } else if (strcmp(word, "password") == 0) { if ((word = fetch_read_word(f)) == NULL) goto ferr; if (snprintf(url->pwd, sizeof(url->pwd), "%s", word) > (int)sizeof(url->pwd)) { fetch_info("password in .netrc is too long"); url->pwd[0] = '\0'; } } else if (strcmp(word, "account") == 0) { if ((word = fetch_read_word(f)) == NULL) goto ferr; /* XXX not supported! */ } else { break; } } fclose(f); url->netrcfd = -1; return (0); ferr: serrno = errno; fclose(f); url->netrcfd = -1; errno = serrno; return (-1); } /* * The no_proxy environment variable specifies a set of domains for * which the proxy should not be consulted; the contents is a comma-, * or space-separated list of domain names. A single asterisk will * override all proxy variables and no transactions will be proxied * (for compatibility with lynx and curl, see the discussion at * ). */ int fetch_no_proxy_match(const char *host) { const char *no_proxy, *p, *q; size_t h_len, d_len; if ((no_proxy = getenv("NO_PROXY")) == NULL && (no_proxy = getenv("no_proxy")) == NULL) return (0); /* asterisk matches any hostname */ if (strcmp(no_proxy, "*") == 0) return (1); h_len = strlen(host); p = no_proxy; do { /* position p at the beginning of a domain suffix */ while (*p == ',' || isspace((unsigned char)*p)) p++; /* position q at the first separator character */ for (q = p; *q; ++q) if (*q == ',' || isspace((unsigned char)*q)) break; d_len = q - p; if (d_len > 0 && h_len >= d_len && strncasecmp(host + h_len - d_len, p, d_len) == 0) { /* domain name matches */ return (1); } p = q + 1; } while (*q); return (0); } Index: head/lib/libfetch/fetch.c =================================================================== --- head/lib/libfetch/fetch.c (revision 341012) +++ head/lib/libfetch/fetch.c (revision 341013) @@ -1,471 +1,484 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1998-2004 Dag-Erling Smørgrav * 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 * in this position and unchanged. * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * 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 __FBSDID("$FreeBSD$"); #include -#include +#include + +#include #include #include #include #include #include "fetch.h" #include "common.h" auth_t fetchAuthMethod; int fetchLastErrCode; char fetchLastErrString[MAXERRSTRING]; int fetchTimeout; int fetchRestartCalls = 1; int fetchDebug; /*** Local data **************************************************************/ /* * Error messages for parser errors */ #define URL_MALFORMED 1 #define URL_BAD_SCHEME 2 #define URL_BAD_PORT 3 static struct fetcherr url_errlist[] = { { URL_MALFORMED, FETCH_URL, "Malformed URL" }, { URL_BAD_SCHEME, FETCH_URL, "Invalid URL scheme" }, { URL_BAD_PORT, FETCH_URL, "Invalid server port" }, { -1, FETCH_UNKNOWN, "Unknown parser error" } }; /*** Public API **************************************************************/ /* * Select the appropriate protocol for the URL scheme, and return a * read-only stream connected to the document referenced by the URL. * Also fill out the struct url_stat. */ FILE * fetchXGet(struct url *URL, struct url_stat *us, const char *flags) { if (us != NULL) { us->size = -1; us->atime = us->mtime = 0; } - if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) + if (strcmp(URL->scheme, SCHEME_FILE) == 0) return (fetchXGetFile(URL, us, flags)); - else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) + else if (strcmp(URL->scheme, SCHEME_FTP) == 0) return (fetchXGetFTP(URL, us, flags)); - else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) + else if (strcmp(URL->scheme, SCHEME_HTTP) == 0) return (fetchXGetHTTP(URL, us, flags)); - else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) + else if (strcmp(URL->scheme, SCHEME_HTTPS) == 0) return (fetchXGetHTTP(URL, us, flags)); url_seterr(URL_BAD_SCHEME); return (NULL); } /* * Select the appropriate protocol for the URL scheme, and return a * read-only stream connected to the document referenced by the URL. */ FILE * fetchGet(struct url *URL, const char *flags) { return (fetchXGet(URL, NULL, flags)); } /* * Select the appropriate protocol for the URL scheme, and return a * write-only stream connected to the document referenced by the URL. */ FILE * fetchPut(struct url *URL, const char *flags) { - if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) + if (strcmp(URL->scheme, SCHEME_FILE) == 0) return (fetchPutFile(URL, flags)); - else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) + else if (strcmp(URL->scheme, SCHEME_FTP) == 0) return (fetchPutFTP(URL, flags)); - else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) + else if (strcmp(URL->scheme, SCHEME_HTTP) == 0) return (fetchPutHTTP(URL, flags)); - else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) + else if (strcmp(URL->scheme, SCHEME_HTTPS) == 0) return (fetchPutHTTP(URL, flags)); url_seterr(URL_BAD_SCHEME); return (NULL); } /* * Select the appropriate protocol for the URL scheme, and return the * size of the document referenced by the URL if it exists. */ int fetchStat(struct url *URL, struct url_stat *us, const char *flags) { if (us != NULL) { us->size = -1; us->atime = us->mtime = 0; } - if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) + if (strcmp(URL->scheme, SCHEME_FILE) == 0) return (fetchStatFile(URL, us, flags)); - else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) + else if (strcmp(URL->scheme, SCHEME_FTP) == 0) return (fetchStatFTP(URL, us, flags)); - else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) + else if (strcmp(URL->scheme, SCHEME_HTTP) == 0) return (fetchStatHTTP(URL, us, flags)); - else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) + else if (strcmp(URL->scheme, SCHEME_HTTPS) == 0) return (fetchStatHTTP(URL, us, flags)); url_seterr(URL_BAD_SCHEME); return (-1); } /* * Select the appropriate protocol for the URL scheme, and return a * list of files in the directory pointed to by the URL. */ struct url_ent * fetchList(struct url *URL, const char *flags) { - if (strcasecmp(URL->scheme, SCHEME_FILE) == 0) + if (strcmp(URL->scheme, SCHEME_FILE) == 0) return (fetchListFile(URL, flags)); - else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) + else if (strcmp(URL->scheme, SCHEME_FTP) == 0) return (fetchListFTP(URL, flags)); - else if (strcasecmp(URL->scheme, SCHEME_HTTP) == 0) + else if (strcmp(URL->scheme, SCHEME_HTTP) == 0) return (fetchListHTTP(URL, flags)); - else if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0) + else if (strcmp(URL->scheme, SCHEME_HTTPS) == 0) return (fetchListHTTP(URL, flags)); url_seterr(URL_BAD_SCHEME); return (NULL); } /* * Attempt to parse the given URL; if successful, call fetchXGet(). */ FILE * fetchXGetURL(const char *URL, struct url_stat *us, const char *flags) { struct url *u; FILE *f; if ((u = fetchParseURL(URL)) == NULL) return (NULL); f = fetchXGet(u, us, flags); fetchFreeURL(u); return (f); } /* * Attempt to parse the given URL; if successful, call fetchGet(). */ FILE * fetchGetURL(const char *URL, const char *flags) { return (fetchXGetURL(URL, NULL, flags)); } /* * Attempt to parse the given URL; if successful, call fetchPut(). */ FILE * fetchPutURL(const char *URL, const char *flags) { struct url *u; FILE *f; if ((u = fetchParseURL(URL)) == NULL) return (NULL); f = fetchPut(u, flags); fetchFreeURL(u); return (f); } /* * Attempt to parse the given URL; if successful, call fetchStat(). */ int fetchStatURL(const char *URL, struct url_stat *us, const char *flags) { struct url *u; int s; if ((u = fetchParseURL(URL)) == NULL) return (-1); s = fetchStat(u, us, flags); fetchFreeURL(u); return (s); } /* * Attempt to parse the given URL; if successful, call fetchList(). */ struct url_ent * fetchListURL(const char *URL, const char *flags) { struct url *u; struct url_ent *ue; if ((u = fetchParseURL(URL)) == NULL) return (NULL); ue = fetchList(u, flags); fetchFreeURL(u); return (ue); } /* * Make a URL */ struct url * fetchMakeURL(const char *scheme, const char *host, int port, const char *doc, const char *user, const char *pwd) { struct url *u; if (!scheme || (!host && !doc)) { url_seterr(URL_MALFORMED); return (NULL); } if (port < 0 || port > 65535) { url_seterr(URL_BAD_PORT); return (NULL); } /* allocate struct url */ if ((u = calloc(1, sizeof(*u))) == NULL) { fetch_syserr(); return (NULL); } u->netrcfd = -1; if ((u->doc = strdup(doc ? doc : "/")) == NULL) { fetch_syserr(); free(u); return (NULL); } #define seturl(x) snprintf(u->x, sizeof(u->x), "%s", x) seturl(scheme); seturl(host); seturl(user); seturl(pwd); #undef seturl u->port = port; return (u); } /* * Return value of the given hex digit. */ static int fetch_hexval(char ch) { if (ch >= '0' && ch <= '9') return (ch - '0'); else if (ch >= 'a' && ch <= 'f') return (ch - 'a' + 10); else if (ch >= 'A' && ch <= 'F') return (ch - 'A' + 10); return (-1); } /* * Decode percent-encoded URL component from src into dst, stopping at end * of string, or at @ or : separators. Returns a pointer to the unhandled * part of the input string (null terminator, @, or :). No terminator is * written to dst (it is the caller's responsibility). */ static const char * fetch_pctdecode(char *dst, const char *src, size_t dlen) { int d1, d2; char c; const char *s; for (s = src; *s != '\0' && *s != '@' && *s != ':'; s++) { if (s[0] == '%' && (d1 = fetch_hexval(s[1])) >= 0 && (d2 = fetch_hexval(s[2])) >= 0 && (d1 > 0 || d2 > 0)) { c = d1 << 4 | d2; s += 2; } else { c = *s; } if (dlen-- > 0) *dst++ = c; } return (s); } /* * Split an URL into components. URL syntax is: * [method:/][/[user[:pwd]@]host[:port]/][document] * This almost, but not quite, RFC1738 URL syntax. */ struct url * fetchParseURL(const char *URL) { char *doc; const char *p, *q; struct url *u; - int i; + int i, n; /* allocate struct url */ if ((u = calloc(1, sizeof(*u))) == NULL) { fetch_syserr(); return (NULL); } u->netrcfd = -1; /* scheme name */ if ((p = strstr(URL, ":/"))) { - snprintf(u->scheme, URL_SCHEMELEN+1, - "%.*s", (int)(p - URL), URL); + if (p - URL > URL_SCHEMELEN) + goto ouch; + for (i = 0; URL + i < p; i++) + u->scheme[i] = tolower((unsigned char)URL[i]); URL = ++p; /* * Only one slash: no host, leave slash as part of document * Two slashes: host follows, strip slashes */ if (URL[1] == '/') URL = (p += 2); } else { p = URL; } if (!*URL || *URL == '/' || *URL == '.' || (u->scheme[0] == '\0' && strchr(URL, '/') == NULL && strchr(URL, ':') == NULL)) goto nohost; p = strpbrk(URL, "/@"); if (p && *p == '@') { /* username */ q = fetch_pctdecode(u->user, URL, URL_USERLEN); /* password */ if (*q == ':') q = fetch_pctdecode(u->pwd, q + 1, URL_PWDLEN); p++; } else { p = URL; } /* hostname */ - if (*p == '[' && (q = strchr(p + 1, ']')) != NULL && - (*++q == '\0' || *q == '/' || *q == ':')) { - if ((i = q - p) > MAXHOSTNAMELEN) - i = MAXHOSTNAMELEN; - strncpy(u->host, p, i); - p = q; + if (*p == '[') { + q = p + 1 + strspn(p + 1, ":0123456789ABCDEFabcdef"); + if (*q++ != ']') + goto ouch; } else { - for (i = 0; *p && (*p != '/') && (*p != ':'); p++) - if (i < MAXHOSTNAMELEN) - u->host[i++] = *p; + /* valid characters in a DNS name */ + q = p + strspn(p, "-." "0123456789" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "_" + "abcdefghijklmnopqrstuvwxyz"); } + if ((*q != '\0' && *q != '/' && *q != ':') || q - p > MAXHOSTNAMELEN) + goto ouch; + for (i = 0; p + i < q; i++) + u->host[i] = tolower((unsigned char)p[i]); + u->host[i] = '\0'; + p = q; /* port */ if (*p == ':') { - for (q = ++p; *q && (*q != '/'); q++) - if (isdigit((unsigned char)*q)) - u->port = u->port * 10 + (*q - '0'); - else { + for (n = 0, q = ++p; *q && (*q != '/'); q++) { + if (*q >= '0' && *q <= '9' && n < INT_MAX / 10) { + n = n * 10 + (*q - '0'); + } else { /* invalid port */ url_seterr(URL_BAD_PORT); goto ouch; } + } + if (n < 1 || n > IPPORT_MAX) + goto ouch; + u->port = n; p = q; } nohost: /* document */ if (!*p) p = "/"; - if (strcasecmp(u->scheme, SCHEME_HTTP) == 0 || - strcasecmp(u->scheme, SCHEME_HTTPS) == 0) { + if (strcmp(u->scheme, SCHEME_HTTP) == 0 || + strcmp(u->scheme, SCHEME_HTTPS) == 0) { const char hexnums[] = "0123456789abcdef"; /* percent-escape whitespace. */ if ((doc = malloc(strlen(p) * 3 + 1)) == NULL) { fetch_syserr(); goto ouch; } u->doc = doc; while (*p != '\0') { if (!isspace((unsigned char)*p)) { *doc++ = *p++; } else { *doc++ = '%'; *doc++ = hexnums[((unsigned int)*p) >> 4]; *doc++ = hexnums[((unsigned int)*p) & 0xf]; p++; } } *doc = '\0'; } else if ((u->doc = strdup(p)) == NULL) { fetch_syserr(); goto ouch; } DEBUGF("scheme: \"%s\"\n" "user: \"%s\"\n" "password: \"%s\"\n" "host: \"%s\"\n" "port: \"%d\"\n" "document: \"%s\"\n", u->scheme, u->user, u->pwd, u->host, u->port, u->doc); return (u); ouch: free(u); return (NULL); } /* * Free a URL */ void fetchFreeURL(struct url *u) { free(u->doc); free(u); } Index: head/lib/libfetch/ftp.c =================================================================== --- head/lib/libfetch/ftp.c (revision 341012) +++ head/lib/libfetch/ftp.c (revision 341013) @@ -1,1210 +1,1210 @@ /*- * SPDX-License-Identifier: (BSD-3-Clause AND Beerware) * * Copyright (c) 1998-2011 Dag-Erling Smørgrav * 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 * in this position and unchanged. * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * 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 __FBSDID("$FreeBSD$"); /* * Portions of this code were taken from or based on ftpio.c: * * ---------------------------------------------------------------------------- * "THE BEER-WARE LICENSE" (Revision 42): * wrote this file. As long as you retain this notice you * can do whatever you want with this stuff. If we meet some day, and you think * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp * ---------------------------------------------------------------------------- * * Major Changelog: * * Dag-Erling Smørgrav * 9 Jun 1998 * * Incorporated into libfetch * * Jordan K. Hubbard * 17 Jan 1996 * * Turned inside out. Now returns xfers as new file ids, not as a special * `state' of FTP_t * * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $ * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fetch.h" #include "common.h" #include "ftperr.h" #define FTP_ANONYMOUS_USER "anonymous" #define FTP_CONNECTION_ALREADY_OPEN 125 #define FTP_OPEN_DATA_CONNECTION 150 #define FTP_OK 200 #define FTP_FILE_STATUS 213 #define FTP_SERVICE_READY 220 #define FTP_TRANSFER_COMPLETE 226 #define FTP_PASSIVE_MODE 227 #define FTP_LPASSIVE_MODE 228 #define FTP_EPASSIVE_MODE 229 #define FTP_LOGGED_IN 230 #define FTP_FILE_ACTION_OK 250 #define FTP_DIRECTORY_CREATED 257 /* multiple meanings */ #define FTP_FILE_CREATED 257 /* multiple meanings */ #define FTP_WORKING_DIRECTORY 257 /* multiple meanings */ #define FTP_NEED_PASSWORD 331 #define FTP_NEED_ACCOUNT 332 #define FTP_FILE_OK 350 #define FTP_SYNTAX_ERROR 500 #define FTP_PROTOCOL_ERROR 999 static struct url cached_host; static conn_t *cached_connection; #define isftpreply(foo) \ (isdigit((unsigned char)foo[0]) && \ isdigit((unsigned char)foo[1]) && \ isdigit((unsigned char)foo[2]) && \ (foo[3] == ' ' || foo[3] == '\0')) #define isftpinfo(foo) \ (isdigit((unsigned char)foo[0]) && \ isdigit((unsigned char)foo[1]) && \ isdigit((unsigned char)foo[2]) && \ foo[3] == '-') /* * Translate IPv4 mapped IPv6 address to IPv4 address */ static void unmappedaddr(struct sockaddr_in6 *sin6) { struct sockaddr_in *sin4; u_int32_t addr; int port; if (sin6->sin6_family != AF_INET6 || !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) return; sin4 = (struct sockaddr_in *)sin6; addr = *(u_int32_t *)(uintptr_t)&sin6->sin6_addr.s6_addr[12]; port = sin6->sin6_port; memset(sin4, 0, sizeof(struct sockaddr_in)); sin4->sin_addr.s_addr = addr; sin4->sin_port = port; sin4->sin_family = AF_INET; sin4->sin_len = sizeof(struct sockaddr_in); } /* * Get server response */ static int ftp_chkerr(conn_t *conn) { if (fetch_getln(conn) == -1) { fetch_syserr(); return (-1); } if (isftpinfo(conn->buf)) { while (conn->buflen && !isftpreply(conn->buf)) { if (fetch_getln(conn) == -1) { fetch_syserr(); return (-1); } } } while (conn->buflen && isspace((unsigned char)conn->buf[conn->buflen - 1])) conn->buflen--; conn->buf[conn->buflen] = '\0'; if (!isftpreply(conn->buf)) { ftp_seterr(FTP_PROTOCOL_ERROR); return (-1); } conn->err = (conn->buf[0] - '0') * 100 + (conn->buf[1] - '0') * 10 + (conn->buf[2] - '0'); return (conn->err); } /* * Send a command and check reply */ static int ftp_cmd(conn_t *conn, const char *fmt, ...) { va_list ap; size_t len; char *msg; int r; va_start(ap, fmt); len = vasprintf(&msg, fmt, ap); va_end(ap); if (msg == NULL) { errno = ENOMEM; fetch_syserr(); return (-1); } r = fetch_putln(conn, msg, len); free(msg); if (r == -1) { fetch_syserr(); return (-1); } return (ftp_chkerr(conn)); } /* * Return a pointer to the filename part of a path */ static const char * ftp_filename(const char *file, int *len, int *type) { const char *s; if ((s = strrchr(file, '/')) == NULL) s = file; else s = s + 1; *len = strlen(s); if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) { *type = s[*len - 1]; *len -= 7; } else { *type = '\0'; } return (s); } /* * Get current working directory from the reply to a CWD, PWD or CDUP * command. */ static int ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen) { char *src, *dst, *end; int q; if (conn->err != FTP_WORKING_DIRECTORY && conn->err != FTP_FILE_ACTION_OK) return (FTP_PROTOCOL_ERROR); end = conn->buf + conn->buflen; src = conn->buf + 4; if (src >= end || *src++ != '"') return (FTP_PROTOCOL_ERROR); for (q = 0, dst = pwd; src < end && pwdlen--; ++src) { if (!q && *src == '"') q = 1; else if (q && *src != '"') break; else if (q) *dst++ = '"', q = 0; else *dst++ = *src; } if (!pwdlen) return (FTP_PROTOCOL_ERROR); *dst = '\0'; #if 0 DEBUGF("pwd: [%s]\n", pwd); #endif return (FTP_OK); } /* * Change working directory to the directory that contains the specified * file. */ static int ftp_cwd(conn_t *conn, const char *file) { const char *beg, *end; char pwd[PATH_MAX]; int e, i, len; /* If no slashes in name, no need to change dirs. */ if ((end = strrchr(file, '/')) == NULL) return (0); if ((e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { ftp_seterr(e); return (-1); } for (;;) { len = strlen(pwd); /* Look for a common prefix between PWD and dir to fetch. */ for (i = 0; i <= len && i <= end - file; ++i) if (pwd[i] != file[i]) break; #if 0 DEBUGF("have: [%.*s|%s]\n", i, pwd, pwd + i); DEBUGF("want: [%.*s|%s]\n", i, file, file + i); #endif /* Keep going up a dir until we have a matching prefix. */ if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/')) break; if ((e = ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK || (e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY || (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) { ftp_seterr(e); return (-1); } } #ifdef FTP_COMBINE_CWDS /* Skip leading slashes, even "////". */ for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i) /* nothing */ ; /* If there is no trailing dir, we're already there. */ if (beg >= end) return (0); /* Change to the directory all in one chunk (e.g., foo/bar/baz). */ e = ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg); if (e == FTP_FILE_ACTION_OK) return (0); #endif /* FTP_COMBINE_CWDS */ /* That didn't work so go back to legacy behavior (multiple CWDs). */ for (beg = file + i; beg < end; beg = file + i + 1) { while (*beg == '/') ++beg, ++i; for (++i; file + i < end && file[i] != '/'; ++i) /* nothing */ ; e = ftp_cmd(conn, "CWD %.*s", file + i - beg, beg); if (e != FTP_FILE_ACTION_OK) { ftp_seterr(e); return (-1); } } return (0); } /* * Set transfer mode and data type */ static int ftp_mode_type(conn_t *conn, int mode, int type) { int e; switch (mode) { case 0: case 's': mode = 'S'; case 'S': break; default: return (FTP_PROTOCOL_ERROR); } if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) { if (mode == 'S') { /* * Stream mode is supposed to be the default - so * much so that some servers not only do not * support any other mode, but do not support the * MODE command at all. * * If "MODE S" fails, it is unlikely that we * previously succeeded in setting a different * mode. Therefore, we simply hope that the * server is already in the correct mode, and * silently ignore the failure. */ } else { return (e); } } switch (type) { case 0: case 'i': type = 'I'; case 'I': break; case 'a': type = 'A'; case 'A': break; case 'd': type = 'D'; case 'D': /* can't handle yet */ default: return (FTP_PROTOCOL_ERROR); } if ((e = ftp_cmd(conn, "TYPE %c", type)) != FTP_OK) return (e); return (FTP_OK); } /* * Request and parse file stats */ static int ftp_stat(conn_t *conn, const char *file, struct url_stat *us) { char *ln; const char *filename; int filenamelen, type; struct tm tm; time_t t; int e; us->size = -1; us->atime = us->mtime = 0; filename = ftp_filename(file, &filenamelen, &type); if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) { ftp_seterr(e); return (-1); } e = ftp_cmd(conn, "SIZE %.*s", filenamelen, filename); if (e != FTP_FILE_STATUS) { ftp_seterr(e); return (-1); } for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) /* nothing */ ; for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++) us->size = us->size * 10 + *ln - '0'; if (*ln && !isspace((unsigned char)*ln)) { ftp_seterr(FTP_PROTOCOL_ERROR); us->size = -1; return (-1); } if (us->size == 0) us->size = -1; DEBUGF("size: [%lld]\n", (long long)us->size); e = ftp_cmd(conn, "MDTM %.*s", filenamelen, filename); if (e != FTP_FILE_STATUS) { ftp_seterr(e); return (-1); } for (ln = conn->buf + 4; *ln && isspace((unsigned char)*ln); ln++) /* nothing */ ; switch (strspn(ln, "0123456789")) { case 14: break; case 15: ln++; ln[0] = '2'; ln[1] = '0'; break; default: ftp_seterr(FTP_PROTOCOL_ERROR); return (-1); } if (sscanf(ln, "%04d%02d%02d%02d%02d%02d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) { ftp_seterr(FTP_PROTOCOL_ERROR); return (-1); } tm.tm_mon--; tm.tm_year -= 1900; tm.tm_isdst = -1; t = timegm(&tm); if (t == (time_t)-1) t = time(NULL); us->mtime = t; us->atime = t; DEBUGF("last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec); return (0); } /* * I/O functions for FTP */ struct ftpio { conn_t *cconn; /* Control connection */ conn_t *dconn; /* Data connection */ int dir; /* Direction */ int eof; /* EOF reached */ int err; /* Error code */ }; static int ftp_readfn(void *, char *, int); static int ftp_writefn(void *, const char *, int); static fpos_t ftp_seekfn(void *, fpos_t, int); static int ftp_closefn(void *); static int ftp_readfn(void *v, char *buf, int len) { struct ftpio *io; int r; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return (-1); } if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) { errno = EBADF; return (-1); } if (io->err) { errno = io->err; return (-1); } if (io->eof) return (0); r = fetch_read(io->dconn, buf, len); if (r > 0) return (r); if (r == 0) { io->eof = 1; return (0); } if (errno != EINTR) io->err = errno; return (-1); } static int ftp_writefn(void *v, const char *buf, int len) { struct ftpio *io; int w; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return (-1); } if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) { errno = EBADF; return (-1); } if (io->err) { errno = io->err; return (-1); } w = fetch_write(io->dconn, buf, len); if (w >= 0) return (w); if (errno != EINTR) io->err = errno; return (-1); } static fpos_t ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused) { struct ftpio *io; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return (-1); } errno = ESPIPE; return (-1); } static int ftp_closefn(void *v) { struct ftpio *io; int r; io = (struct ftpio *)v; if (io == NULL) { errno = EBADF; return (-1); } if (io->dir == -1) return (0); if (io->cconn == NULL || io->dconn == NULL) { errno = EBADF; return (-1); } fetch_close(io->dconn); io->dir = -1; io->dconn = NULL; DEBUGF("Waiting for final status\n"); r = ftp_chkerr(io->cconn); if (io->cconn == cached_connection && io->cconn->ref == 1) cached_connection = NULL; fetch_close(io->cconn); free(io); return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1; } static FILE * ftp_setup(conn_t *cconn, conn_t *dconn, int mode) { struct ftpio *io; FILE *f; if (cconn == NULL || dconn == NULL) return (NULL); if ((io = malloc(sizeof(*io))) == NULL) return (NULL); io->cconn = cconn; io->dconn = dconn; io->dir = mode; io->eof = io->err = 0; f = funopen(io, ftp_readfn, ftp_writefn, ftp_seekfn, ftp_closefn); if (f == NULL) free(io); return (f); } /* * Transfer file */ static FILE * ftp_transfer(conn_t *conn, const char *oper, const char *file, int mode, off_t offset, const char *flags) { struct sockaddr_storage sa; struct sockaddr_in6 *sin6; struct sockaddr_in *sin4; const char *bindaddr; const char *filename; int filenamelen, type; int low, pasv, verbose; int e, sd = -1; socklen_t l; char *s; FILE *df; /* check flags */ low = CHECK_FLAG('l'); pasv = CHECK_FLAG('p') || !CHECK_FLAG('P'); verbose = CHECK_FLAG('v'); /* passive mode */ if ((s = getenv("FTP_PASSIVE_MODE")) != NULL) pasv = (strncasecmp(s, "no", 2) != 0); /* isolate filename */ filename = ftp_filename(file, &filenamelen, &type); /* set transfer mode and data type */ if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) goto ouch; /* find our own address, bind, and listen */ l = sizeof(sa); if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1) goto sysouch; if (sa.ss_family == AF_INET6) unmappedaddr((struct sockaddr_in6 *)&sa); /* open data socket */ if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { fetch_syserr(); return (NULL); } if (pasv) { u_char addr[64]; char *ln, *p; unsigned int i; int port; /* send PASV command */ if (verbose) fetch_info("setting passive mode"); switch (sa.ss_family) { case AF_INET: if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE) goto ouch; break; case AF_INET6: if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) { if (e == -1) goto ouch; if ((e = ftp_cmd(conn, "LPSV")) != FTP_LPASSIVE_MODE) goto ouch; } break; default: e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ goto ouch; } /* * Find address and port number. The reply to the PASV command * is IMHO the one and only weak point in the FTP protocol. */ ln = conn->buf; switch (e) { case FTP_PASSIVE_MODE: case FTP_LPASSIVE_MODE: for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++) /* nothing */ ; if (!*p) { e = FTP_PROTOCOL_ERROR; goto ouch; } l = (e == FTP_PASSIVE_MODE ? 6 : 21); for (i = 0; *p && i < l; i++, p++) addr[i] = strtol(p, &p, 10); if (i < l) { e = FTP_PROTOCOL_ERROR; goto ouch; } break; case FTP_EPASSIVE_MODE: for (p = ln + 3; *p && *p != '('; p++) /* nothing */ ; if (!*p) { e = FTP_PROTOCOL_ERROR; goto ouch; } ++p; if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2], &port, &addr[3]) != 5 || addr[0] != addr[1] || addr[0] != addr[2] || addr[0] != addr[3]) { e = FTP_PROTOCOL_ERROR; goto ouch; } break; } /* seek to required offset */ if (offset) if (ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK) goto sysouch; /* construct sockaddr for data socket */ l = sizeof(sa); if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1) goto sysouch; if (sa.ss_family == AF_INET6) unmappedaddr((struct sockaddr_in6 *)&sa); switch (sa.ss_family) { case AF_INET6: sin6 = (struct sockaddr_in6 *)&sa; if (e == FTP_EPASSIVE_MODE) sin6->sin6_port = htons(port); else { memcpy(&sin6->sin6_addr, addr + 2, 16); memcpy(&sin6->sin6_port, addr + 19, 2); } break; case AF_INET: sin4 = (struct sockaddr_in *)&sa; if (e == FTP_EPASSIVE_MODE) sin4->sin_port = htons(port); else { memcpy(&sin4->sin_addr, addr, 4); memcpy(&sin4->sin_port, addr + 4, 2); } break; default: e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ break; } /* connect to data port */ if (verbose) fetch_info("opening data connection"); bindaddr = getenv("FETCH_BIND_ADDRESS"); if (bindaddr != NULL && *bindaddr != '\0' && (e = fetch_bind(sd, sa.ss_family, bindaddr)) != 0) goto ouch; if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) goto sysouch; /* make the server initiate the transfer */ if (verbose) fetch_info("initiating transfer"); e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) goto ouch; } else { u_int32_t a; u_short p; int arg, d; char *ap; char hname[INET6_ADDRSTRLEN]; switch (sa.ss_family) { case AF_INET6: ((struct sockaddr_in6 *)&sa)->sin6_port = 0; #ifdef IPV6_PORTRANGE arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH; if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE, (char *)&arg, sizeof(arg)) == -1) goto sysouch; #endif break; case AF_INET: ((struct sockaddr_in *)&sa)->sin_port = 0; arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH; if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, (char *)&arg, sizeof(arg)) == -1) goto sysouch; break; } if (verbose) fetch_info("binding data socket"); if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1) goto sysouch; if (listen(sd, 1) == -1) goto sysouch; /* find what port we're on and tell the server */ if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1) goto sysouch; switch (sa.ss_family) { case AF_INET: sin4 = (struct sockaddr_in *)&sa; a = ntohl(sin4->sin_addr.s_addr); p = ntohs(sin4->sin_port); e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d", (a >> 24) & 0xff, (a >> 16) & 0xff, (a >> 8) & 0xff, a & 0xff, (p >> 8) & 0xff, p & 0xff); break; case AF_INET6: #define UC(b) (((int)b)&0xff) e = -1; sin6 = (struct sockaddr_in6 *)&sa; sin6->sin6_scope_id = 0; if (getnameinfo((struct sockaddr *)&sa, sa.ss_len, hname, sizeof(hname), NULL, 0, NI_NUMERICHOST) == 0) { e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname, htons(sin6->sin6_port)); if (e == -1) goto ouch; } if (e != FTP_OK) { ap = (char *)&sin6->sin6_addr; e = ftp_cmd(conn, "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 6, 16, UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]), UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]), UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]), UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]), 2, (ntohs(sin6->sin6_port) >> 8) & 0xff, ntohs(sin6->sin6_port) & 0xff); } break; default: e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */ goto ouch; } if (e != FTP_OK) goto ouch; /* seek to required offset */ if (offset) if (ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK) goto sysouch; /* make the server initiate the transfer */ if (verbose) fetch_info("initiating transfer"); e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename); if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION) goto ouch; /* accept the incoming connection and go to town */ if ((d = accept(sd, NULL, NULL)) == -1) goto sysouch; close(sd); sd = d; } if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL) goto sysouch; return (df); sysouch: fetch_syserr(); if (sd >= 0) close(sd); return (NULL); ouch: if (e != -1) ftp_seterr(e); if (sd >= 0) close(sd); return (NULL); } /* * Authenticate */ static int ftp_authenticate(conn_t *conn, struct url *url, struct url *purl) { const char *user, *pwd, *logname; char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1]; int e, len; /* XXX FTP_AUTH, and maybe .netrc */ /* send user name and password */ if (url->user[0] == '\0') fetch_netrc_auth(url); user = url->user; if (*user == '\0') if ((user = getenv("FTP_LOGIN")) != NULL) DEBUGF("FTP_LOGIN=%s\n", user); if (user == NULL || *user == '\0') user = FTP_ANONYMOUS_USER; if (purl && url->port == fetch_default_port(url->scheme)) e = ftp_cmd(conn, "USER %s@%s", user, url->host); else if (purl) e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port); else e = ftp_cmd(conn, "USER %s", user); /* did the server request a password? */ if (e == FTP_NEED_PASSWORD) { pwd = url->pwd; if (*pwd == '\0') if ((pwd = getenv("FTP_PASSWORD")) != NULL) DEBUGF("FTP_PASSWORD=%s\n", pwd); if (pwd == NULL || *pwd == '\0') { if ((logname = getlogin()) == NULL) logname = FTP_ANONYMOUS_USER; if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0) len = 0; else if (len > MAXLOGNAME) len = MAXLOGNAME; gethostname(pbuf + len, sizeof(pbuf) - len); pwd = pbuf; } e = ftp_cmd(conn, "PASS %s", pwd); } return (e); } /* * Log on to FTP server */ static conn_t * ftp_connect(struct url *url, struct url *purl, const char *flags) { conn_t *conn; int e, direct, verbose; #ifdef INET6 int af = AF_UNSPEC; #else int af = AF_INET; #endif direct = CHECK_FLAG('d'); verbose = CHECK_FLAG('v'); if (CHECK_FLAG('4')) af = AF_INET; else if (CHECK_FLAG('6')) af = AF_INET6; if (direct) purl = NULL; /* check for proxy */ if (purl) { /* XXX proxy authentication! */ conn = fetch_connect(purl->host, purl->port, af, verbose); } else { /* no proxy, go straight to target */ conn = fetch_connect(url->host, url->port, af, verbose); purl = NULL; } /* check connection */ if (conn == NULL) /* fetch_connect() has already set an error code */ return (NULL); /* expect welcome message */ if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY) goto fouch; /* authenticate */ if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN) goto fouch; /* TODO: Request extended features supported, if any (RFC 3659). */ /* done */ return (conn); fouch: if (e != -1) ftp_seterr(e); fetch_close(conn); return (NULL); } /* * Disconnect from server */ static void ftp_disconnect(conn_t *conn) { (void)ftp_cmd(conn, "QUIT"); if (conn == cached_connection && conn->ref == 1) cached_connection = NULL; fetch_close(conn); } /* * Check if we're already connected */ static int ftp_isconnected(struct url *url) { return (cached_connection && (strcmp(url->host, cached_host.host) == 0) && (strcmp(url->user, cached_host.user) == 0) && (strcmp(url->pwd, cached_host.pwd) == 0) && (url->port == cached_host.port)); } /* * Check the cache, reconnect if no luck */ static conn_t * ftp_cached_connect(struct url *url, struct url *purl, const char *flags) { conn_t *conn; int e; /* set default port */ if (!url->port) url->port = fetch_default_port(url->scheme); /* try to use previously cached connection */ if (ftp_isconnected(url)) { e = ftp_cmd(cached_connection, "NOOP"); if (e == FTP_OK || e == FTP_SYNTAX_ERROR) return (fetch_ref(cached_connection)); } /* connect to server */ if ((conn = ftp_connect(url, purl, flags)) == NULL) return (NULL); if (cached_connection) ftp_disconnect(cached_connection); cached_connection = fetch_ref(conn); memcpy(&cached_host, url, sizeof(*url)); return (conn); } /* * Check the proxy settings */ static struct url * ftp_get_proxy(struct url * url, const char *flags) { struct url *purl; char *p; if (flags != NULL && strchr(flags, 'd') != NULL) return (NULL); if (fetch_no_proxy_match(url->host)) return (NULL); if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) || (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && *p && (purl = fetchParseURL(p)) != NULL) { if (!*purl->scheme) { if (getenv("FTP_PROXY") || getenv("ftp_proxy")) strcpy(purl->scheme, SCHEME_FTP); else strcpy(purl->scheme, SCHEME_HTTP); } if (!purl->port) purl->port = fetch_default_proxy_port(purl->scheme); - if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 || - strcasecmp(purl->scheme, SCHEME_HTTP) == 0) + if (strcmp(purl->scheme, SCHEME_FTP) == 0 || + strcmp(purl->scheme, SCHEME_HTTP) == 0) return (purl); fetchFreeURL(purl); } return (NULL); } /* * Process an FTP request */ FILE * ftp_request(struct url *url, const char *op, struct url_stat *us, struct url *purl, const char *flags) { conn_t *conn; int oflag; /* check if we should use HTTP instead */ - if (purl && (strcasecmp(purl->scheme, SCHEME_HTTP) == 0 || - strcasecmp(purl->scheme, SCHEME_HTTPS) == 0)) { + if (purl && (strcmp(purl->scheme, SCHEME_HTTP) == 0 || + strcmp(purl->scheme, SCHEME_HTTPS) == 0)) { if (strcmp(op, "STAT") == 0) return (http_request(url, "HEAD", us, purl, flags)); else if (strcmp(op, "RETR") == 0) return (http_request(url, "GET", us, purl, flags)); /* * Our HTTP code doesn't support PUT requests yet, so try * a direct connection. */ } /* connect to server */ conn = ftp_cached_connect(url, purl, flags); if (purl) fetchFreeURL(purl); if (conn == NULL) return (NULL); /* change directory */ if (ftp_cwd(conn, url->doc) == -1) goto errsock; /* stat file */ if (us && ftp_stat(conn, url->doc, us) == -1 && fetchLastErrCode != FETCH_PROTO && fetchLastErrCode != FETCH_UNAVAIL) goto errsock; /* just a stat */ if (strcmp(op, "STAT") == 0) { --conn->ref; ftp_disconnect(conn); return (FILE *)1; /* bogus return value */ } if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0) oflag = O_WRONLY; else oflag = O_RDONLY; /* initiate the transfer */ return (ftp_transfer(conn, op, url->doc, oflag, url->offset, flags)); errsock: ftp_disconnect(conn); return (NULL); } /* * Get and stat file */ FILE * fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags) { return (ftp_request(url, "RETR", us, ftp_get_proxy(url, flags), flags)); } /* * Get file */ FILE * fetchGetFTP(struct url *url, const char *flags) { return (fetchXGetFTP(url, NULL, flags)); } /* * Put file */ FILE * fetchPutFTP(struct url *url, const char *flags) { return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL, ftp_get_proxy(url, flags), flags)); } /* * Get file stats */ int fetchStatFTP(struct url *url, struct url_stat *us, const char *flags) { FILE *f; f = ftp_request(url, "STAT", us, ftp_get_proxy(url, flags), flags); if (f == NULL) return (-1); /* * When op is "STAT", ftp_request() will return either NULL or * (FILE *)1, never a valid FILE *, so we mustn't fclose(f) before * returning, as it would cause a segfault. */ return (0); } /* * List a directory */ struct url_ent * fetchListFTP(struct url *url __unused, const char *flags __unused) { warnx("fetchListFTP(): not implemented"); return (NULL); }