Index: head/lib/libfetch/Makefile =================================================================== --- head/lib/libfetch/Makefile (revision 351572) +++ head/lib/libfetch/Makefile (revision 351573) @@ -1,82 +1,83 @@ # $FreeBSD$ .include PACKAGE=lib${LIB} LIB= fetch CFLAGS+= -I. SRCS= fetch.c common.c ftp.c http.c file.c \ ftperr.h httperr.h INCS= fetch.h MAN= fetch.3 CLEANFILES= ftperr.h httperr.h .if ${MK_INET6_SUPPORT} != "no" CFLAGS+= -DINET6 .endif .if ${MK_OPENSSL} != "no" CFLAGS+= -DWITH_SSL LIBADD+= ssl crypto .else LIBADD+= md .endif CFLAGS+= -DFTP_COMBINE_CWDS CSTD?= c99 SHLIB_MAJOR= 6 ftperr.h: ftp.errors ${.CURDIR}/Makefile @echo "static struct fetcherr ftp_errlist[] = {" > ${.TARGET} @cat ${.CURDIR}/ftp.errors \ | grep -v ^# \ | sort \ | while read NUM CAT STRING; do \ echo " { $${NUM}, FETCH_$${CAT}, \"$${STRING}\" },"; \ done >> ${.TARGET} @echo " { -1, FETCH_UNKNOWN, \"Unknown FTP error\" }" >> ${.TARGET} @echo "};" >> ${.TARGET} httperr.h: http.errors ${.CURDIR}/Makefile @echo "static struct fetcherr http_errlist[] = {" > ${.TARGET} @cat ${.CURDIR}/http.errors \ | grep -v ^# \ | sort \ | while read NUM CAT STRING; do \ echo " { $${NUM}, FETCH_$${CAT}, \"$${STRING}\" },"; \ done >> ${.TARGET} @echo " { -1, FETCH_UNKNOWN, \"Unknown HTTP error\" }" >> ${.TARGET} @echo "};" >> ${.TARGET} MLINKS+= fetch.3 fetchFreeURL.3 MLINKS+= fetch.3 fetchGet.3 MLINKS+= fetch.3 fetchGetFTP.3 MLINKS+= fetch.3 fetchGetFile.3 MLINKS+= fetch.3 fetchGetHTTP.3 MLINKS+= fetch.3 fetchGetURL.3 MLINKS+= fetch.3 fetchList.3 MLINKS+= fetch.3 fetchListFTP.3 MLINKS+= fetch.3 fetchListFile.3 MLINKS+= fetch.3 fetchListHTTP.3 MLINKS+= fetch.3 fetchListURL.3 MLINKS+= fetch.3 fetchMakeURL.3 MLINKS+= fetch.3 fetchParseURL.3 MLINKS+= fetch.3 fetchPut.3 MLINKS+= fetch.3 fetchPutFTP.3 MLINKS+= fetch.3 fetchPutFile.3 MLINKS+= fetch.3 fetchPutHTTP.3 MLINKS+= fetch.3 fetchPutURL.3 +MLINKS+= fetch.3 fetchReqHTTP.3 MLINKS+= fetch.3 fetchStat.3 MLINKS+= fetch.3 fetchStatFTP.3 MLINKS+= fetch.3 fetchStatFile.3 MLINKS+= fetch.3 fetchStatHTTP.3 MLINKS+= fetch.3 fetchStatURL.3 MLINKS+= fetch.3 fetchXGet.3 MLINKS+= fetch.3 fetchXGetFTP.3 MLINKS+= fetch.3 fetchXGetFile.3 MLINKS+= fetch.3 fetchXGetHTTP.3 MLINKS+= fetch.3 fetchXGetURL.3 .include Index: head/lib/libfetch/fetch.3 =================================================================== --- head/lib/libfetch/fetch.3 (revision 351572) +++ head/lib/libfetch/fetch.3 (revision 351573) @@ -1,843 +1,859 @@ .\"- .\" Copyright (c) 1998-2013 Dag-Erling Smørgrav .\" Copyright (c) 2013-2016 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. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. .\" .\" $FreeBSD$ .\" -.Dd March 18, 2016 +.Dd August 28, 2019 .Dt FETCH 3 .Os .Sh NAME .Nm fetchMakeURL , .Nm fetchParseURL , .Nm fetchFreeURL , .Nm fetchXGetURL , .Nm fetchGetURL , .Nm fetchPutURL , .Nm fetchStatURL , .Nm fetchListURL , .Nm fetchXGet , .Nm fetchGet , .Nm fetchPut , .Nm fetchStat , .Nm fetchList , .Nm fetchXGetFile , .Nm fetchGetFile , .Nm fetchPutFile , .Nm fetchStatFile , .Nm fetchListFile , .Nm fetchXGetHTTP , .Nm fetchGetHTTP , .Nm fetchPutHTTP , .Nm fetchStatHTTP , .Nm fetchListHTTP , +.Nm fetchReqHTTP , .Nm fetchXGetFTP , .Nm fetchGetFTP , .Nm fetchPutFTP , .Nm fetchStatFTP , .Nm fetchListFTP .Nd file transfer functions .Sh LIBRARY .Lb libfetch .Sh SYNOPSIS .In sys/param.h .In stdio.h .In fetch.h .Ft struct url * .Fn fetchMakeURL "const char *scheme" "const char *host" "int port" "const char *doc" "const char *user" "const char *pwd" .Ft struct url * .Fn fetchParseURL "const char *URL" .Ft void .Fn fetchFreeURL "struct url *u" .Ft FILE * .Fn fetchXGetURL "const char *URL" "struct url_stat *us" "const char *flags" .Ft FILE * .Fn fetchGetURL "const char *URL" "const char *flags" .Ft FILE * .Fn fetchPutURL "const char *URL" "const char *flags" .Ft int .Fn fetchStatURL "const char *URL" "struct url_stat *us" "const char *flags" .Ft struct url_ent * .Fn fetchListURL "const char *URL" "const char *flags" .Ft FILE * .Fn fetchXGet "struct url *u" "struct url_stat *us" "const char *flags" .Ft FILE * .Fn fetchGet "struct url *u" "const char *flags" .Ft FILE * .Fn fetchPut "struct url *u" "const char *flags" .Ft int .Fn fetchStat "struct url *u" "struct url_stat *us" "const char *flags" .Ft struct url_ent * .Fn fetchList "struct url *u" "const char *flags" .Ft FILE * .Fn fetchXGetFile "struct url *u" "struct url_stat *us" "const char *flags" .Ft FILE * .Fn fetchGetFile "struct url *u" "const char *flags" .Ft FILE * .Fn fetchPutFile "struct url *u" "const char *flags" .Ft int .Fn fetchStatFile "struct url *u" "struct url_stat *us" "const char *flags" .Ft struct url_ent * .Fn fetchListFile "struct url *u" "const char *flags" .Ft FILE * .Fn fetchXGetHTTP "struct url *u" "struct url_stat *us" "const char *flags" .Ft FILE * .Fn fetchGetHTTP "struct url *u" "const char *flags" .Ft FILE * .Fn fetchPutHTTP "struct url *u" "const char *flags" .Ft int .Fn fetchStatHTTP "struct url *u" "struct url_stat *us" "const char *flags" .Ft struct url_ent * .Fn fetchListHTTP "struct url *u" "const char *flags" .Ft FILE * +.Fn fetchReqHTTP "struct url *u" "const char *method" "const char *flags" "const char *content_type" "const char *body" +.Ft FILE * .Fn fetchXGetFTP "struct url *u" "struct url_stat *us" "const char *flags" .Ft FILE * .Fn fetchGetFTP "struct url *u" "const char *flags" .Ft FILE * .Fn fetchPutFTP "struct url *u" "const char *flags" .Ft int .Fn fetchStatFTP "struct url *u" "struct url_stat *us" "const char *flags" .Ft struct url_ent * .Fn fetchListFTP "struct url *u" "const char *flags" .Sh DESCRIPTION These functions implement a high-level library for retrieving and uploading files using Uniform Resource Locators (URLs). .Pp .Fn fetchParseURL takes a URL in the form of a null-terminated string and splits it into its components function according to the Common Internet Scheme Syntax detailed in RFC1738. A regular expression which produces this syntax is: .Bd -literal :(//((:)?@)?(:)?)?/()? .Ed .Pp If the URL does not seem to begin with a scheme name, the following syntax is assumed: .Bd -literal (((:)?@)?(:)?)?/()? .Ed .Pp Note that some components of the URL are not necessarily relevant to all URL schemes. For instance, the file scheme only needs the and components. .Pp .Fn fetchMakeURL and .Fn fetchParseURL return a pointer to a .Vt url structure, which is defined as follows in .In fetch.h : .Bd -literal #define URL_SCHEMELEN 16 #define URL_USERLEN 256 #define URL_PWDLEN 256 struct url { char scheme[URL_SCHEMELEN+1]; char user[URL_USERLEN+1]; char pwd[URL_PWDLEN+1]; char host[MAXHOSTNAMELEN+1]; int port; char *doc; off_t offset; size_t length; time_t ims_time; }; .Ed .Pp The .Va ims_time field stores the time value for .Li If-Modified-Since HTTP requests. .Pp The pointer returned by .Fn fetchMakeURL or .Fn fetchParseURL should be freed using .Fn fetchFreeURL . .Pp .Fn fetchXGetURL , .Fn fetchGetURL , and .Fn fetchPutURL constitute the recommended interface to the .Nm fetch library. They examine the URL passed to them to determine the transfer method, and call the appropriate lower-level functions to perform the actual transfer. .Fn fetchXGetURL also returns the remote document's metadata in the .Vt url_stat structure pointed to by the .Fa us argument. .Pp The .Fa flags argument is a string of characters which specify transfer options. The meaning of the individual flags is scheme-dependent, and is detailed in the appropriate section below. .Pp .Fn fetchStatURL attempts to obtain the requested document's metadata and fill in the structure pointed to by its second argument. The .Vt url_stat structure is defined as follows in .In fetch.h : .Bd -literal struct url_stat { off_t size; time_t atime; time_t mtime; }; .Ed .Pp If the size could not be obtained from the server, the .Fa size field is set to -1. If the modification time could not be obtained from the server, the .Fa mtime field is set to the epoch. If the access time could not be obtained from the server, the .Fa atime field is set to the modification time. .Pp .Fn fetchListURL attempts to list the contents of the directory pointed to by the URL provided. If successful, it returns a malloced array of .Vt url_ent structures. The .Vt url_ent structure is defined as follows in .In fetch.h : .Bd -literal struct url_ent { char name[PATH_MAX]; struct url_stat stat; }; .Ed .Pp The list is terminated by an entry with an empty name. .Pp The pointer returned by .Fn fetchListURL should be freed using .Fn free . .Pp .Fn fetchXGet , .Fn fetchGet , .Fn fetchPut and .Fn fetchStat are similar to .Fn fetchXGetURL , .Fn fetchGetURL , .Fn fetchPutURL and .Fn fetchStatURL , except that they expect a pre-parsed URL in the form of a pointer to a .Vt struct url rather than a string. .Pp All of the .Fn fetchXGetXXX , .Fn fetchGetXXX and .Fn fetchPutXXX functions return a pointer to a stream which can be used to read or write data from or to the requested document, respectively. Note that although the implementation details of the individual access methods vary, it can generally be assumed that a stream returned by one of the .Fn fetchXGetXXX or .Fn fetchGetXXX functions is read-only, and that a stream returned by one of the .Fn fetchPutXXX functions is write-only. .Sh FILE SCHEME .Fn fetchXGetFile , .Fn fetchGetFile and .Fn fetchPutFile provide access to documents which are files in a locally mounted file system. Only the component of the URL is used. .Pp .Fn fetchXGetFile and .Fn fetchGetFile do not accept any flags. .Pp .Fn fetchPutFile accepts the .Ql a (append to file) flag. If that flag is specified, the data written to the stream returned by .Fn fetchPutFile will be appended to the previous contents of the file, instead of replacing them. .Sh FTP SCHEME .Fn fetchXGetFTP , .Fn fetchGetFTP and .Fn fetchPutFTP implement the FTP protocol as described in RFC959. .Pp If the .Ql P (not passive) flag is specified, an active (rather than passive) connection will be attempted. .Pp The .Ql p flag is supported for compatibility with earlier versions where active connections were the default. It has precedence over the .Ql P flag, so if both are specified, .Nm will use a passive connection. .Pp If the .Ql l (low) flag is specified, data sockets will be allocated in the low (or default) port range instead of the high port range (see .Xr ip 4 ) . .Pp If the .Ql d (direct) flag is specified, .Fn fetchXGetFTP , .Fn fetchGetFTP and .Fn fetchPutFTP will use a direct connection even if a proxy server is defined. .Pp If no user name or password is given, the .Nm fetch library will attempt an anonymous login, with user name "anonymous" and password "anonymous@". .Sh HTTP SCHEME The .Fn fetchXGetHTTP , -.Fn fetchGetHTTP -and +.Fn fetchGetHTTP , .Fn fetchPutHTTP +and +.Fn fetchReqHTTP functions implement the HTTP/1.1 protocol. With a little luck, there is even a chance that they comply with RFC2616 and RFC2617. .Pp If the .Ql d (direct) flag is specified, .Fn fetchXGetHTTP , .Fn fetchGetHTTP and .Fn fetchPutHTTP will use a direct connection even if a proxy server is defined. .Pp If the .Ql i (if-modified-since) flag is specified, and the .Va ims_time field is set in .Vt "struct url" , then .Fn fetchXGetHTTP and .Fn fetchGetHTTP will send a conditional .Li If-Modified-Since HTTP header to only fetch the content if it is newer than .Va ims_time . +.Pp +The function +.Fn fetchReqHTTP +can be used to make requests with an arbitrary HTTP verb, +including POST, DELETE, CONNECT, OPTIONS, TRACE or PATCH. +This can be done by setting the argument +.Fa method +to the intended verb, such as +.Ql POST , +and +.Fa body +to the content. .Pp Since there seems to be no good way of implementing the HTTP PUT method in a manner consistent with the rest of the .Nm fetch library, .Fn fetchPutHTTP is currently unimplemented. .Sh HTTPS SCHEME Based on HTTP SCHEME. By default the peer is verified using the CA bundle located in .Pa /usr/local/etc/ssl/cert.pem . If this file does not exist, .Pa /etc/ssl/cert.pem is used instead. If neither file exists, and .Ev SSL_CA_CERT_PATH has not been set, OpenSSL's default CA cert and path settings apply. The certificate bundle can contain multiple CA certificates. A common source of a current CA bundle is .Pa \%security/ca_root_nss . .Pp The CA bundle used for peer verification can be changed by setting the environment variables .Ev SSL_CA_CERT_FILE to point to a concatenated bundle of trusted certificates and .Ev SSL_CA_CERT_PATH to point to a directory containing hashes of trusted CAs (see .Xr verify 1 ) . .Pp A certificate revocation list (CRL) can be used by setting the environment variable .Ev SSL_CRL_FILE (see .Xr crl 1 ) . .Pp Peer verification can be disabled by setting the environment variable .Ev SSL_NO_VERIFY_PEER . Note that this also disables CRL checking. .Pp By default the service identity is verified according to the rules detailed in RFC6125 (also known as hostname verification). This feature can be disabled by setting the environment variable .Ev SSL_NO_VERIFY_HOSTNAME . .Pp Client certificate based authentication is supported. The environment variable .Ev SSL_CLIENT_CERT_FILE should be set to point to a file containing key and client certificate to be used in PEM format. When a PEM-format key is in a separate file from the client certificate, the environment variable .Ev SSL_CLIENT_KEY_FILE can be set to point to the key file. In case the key uses a password, the user will be prompted on standard input (see .Xr PEM 3 ) . .Pp By default .Nm libfetch allows TLSv1 and newer when negotiating the connecting with the remote peer. You can change this behavior by setting the .Ev SSL_ALLOW_SSL3 environment variable to allow SSLv3 and .Ev SSL_NO_TLS1 , .Ev SSL_NO_TLS1_1 and .Ev SSL_NO_TLS1_2 to disable TLS 1.0, 1.1 and 1.2 respectively. .Sh AUTHENTICATION Apart from setting the appropriate environment variables and specifying the user name and password in the URL or the .Vt struct url , the calling program has the option of defining an authentication function with the following prototype: .Pp .Ft int .Fn myAuthMethod "struct url *u" .Pp The callback function should fill in the .Fa user and .Fa pwd fields in the provided .Vt struct url and return 0 on success, or any other value to indicate failure. .Pp To register the authentication callback, simply set .Va fetchAuthMethod to point at it. The callback will be used whenever a site requires authentication and the appropriate environment variables are not set. .Pp This interface is experimental and may be subject to change. .Sh RETURN VALUES .Fn fetchParseURL returns a pointer to a .Vt struct url containing the individual components of the URL. If it is unable to allocate memory, or the URL is syntactically incorrect, .Fn fetchParseURL returns a NULL pointer. .Pp The .Fn fetchStat functions return 0 on success and -1 on failure. .Pp All other functions return a stream pointer which may be used to access the requested document, or NULL if an error occurred. .Pp The following error codes are defined in .In fetch.h : .Bl -tag -width 18n .It Bq Er FETCH_ABORT Operation aborted .It Bq Er FETCH_AUTH Authentication failed .It Bq Er FETCH_DOWN Service unavailable .It Bq Er FETCH_EXISTS File exists .It Bq Er FETCH_FULL File system full .It Bq Er FETCH_INFO Informational response .It Bq Er FETCH_MEMORY Insufficient memory .It Bq Er FETCH_MOVED File has moved .It Bq Er FETCH_NETWORK Network error .It Bq Er FETCH_OK No error .It Bq Er FETCH_PROTO Protocol error .It Bq Er FETCH_RESOLV Resolver error .It Bq Er FETCH_SERVER Server error .It Bq Er FETCH_TEMP Temporary error .It Bq Er FETCH_TIMEOUT Operation timed out .It Bq Er FETCH_UNAVAIL File is not available .It Bq Er FETCH_UNKNOWN Unknown error .It Bq Er FETCH_URL Invalid URL .El .Pp The accompanying error message includes a protocol-specific error code and message, like "File is not available (404 Not Found)" .Sh ENVIRONMENT .Bl -tag -width ".Ev FETCH_BIND_ADDRESS" .It Ev FETCH_BIND_ADDRESS Specifies a hostname or IP address to which sockets used for outgoing connections will be bound. .It Ev FTP_LOGIN Default FTP login if none was provided in the URL. .It Ev FTP_PASSIVE_MODE If set to .Ql no , forces the FTP code to use active mode. If set to any other value, forces passive mode even if the application requested active mode. .It Ev FTP_PASSWORD Default FTP password if the remote server requests one and none was provided in the URL. .It Ev FTP_PROXY URL of the proxy to use for FTP requests. The document part is ignored. FTP and HTTP proxies are supported; if no scheme is specified, FTP is assumed. If the proxy is an FTP proxy, .Nm libfetch will send .Ql user@host as user name to the proxy, where .Ql user is the real user name, and .Ql host is the name of the FTP server. .Pp If this variable is set to an empty string, no proxy will be used for FTP requests, even if the .Ev HTTP_PROXY variable is set. .It Ev ftp_proxy Same as .Ev FTP_PROXY , for compatibility. .It Ev HTTP_ACCEPT Specifies the value of the .Va Accept header for HTTP requests. If empty, no .Va Accept header is sent. The default is .Dq */* . .It Ev HTTP_AUTH Specifies HTTP authorization parameters as a colon-separated list of items. The first and second item are the authorization scheme and realm respectively; further items are scheme-dependent. Currently, the .Dq basic and .Dq digest authorization methods are supported. .Pp Both methods require two parameters: the user name and password, in that order. .Pp This variable is only used if the server requires authorization and no user name or password was specified in the URL. .It Ev HTTP_PROXY URL of the proxy to use for HTTP requests. The document part is ignored. Only HTTP proxies are supported for HTTP requests. If no port number is specified, the default is 3128. .Pp Note that this proxy will also be used for FTP documents, unless the .Ev FTP_PROXY variable is set. .It Ev http_proxy Same as .Ev HTTP_PROXY , for compatibility. .It Ev HTTP_PROXY_AUTH Specifies authorization parameters for the HTTP proxy in the same format as the .Ev HTTP_AUTH variable. .Pp This variable is used if and only if connected to an HTTP proxy, and is ignored if a user and/or a password were specified in the proxy URL. .It Ev HTTP_REFERER Specifies the referrer URL to use for HTTP requests. If set to .Dq auto , the document URL will be used as referrer URL. .It Ev HTTP_USER_AGENT Specifies the User-Agent string to use for HTTP requests. This can be useful when working with HTTP origin or proxy servers that differentiate between user agents. If defined but empty, no User-Agent header is sent. .It Ev NETRC Specifies a file to use instead of .Pa ~/.netrc to look up login names and passwords for FTP and HTTP sites as well as HTTP proxies. See .Xr ftp 1 for a description of the file format. .It Ev NO_PROXY Either a single asterisk, which disables the use of proxies altogether, or a comma- or whitespace-separated list of hosts for which proxies should not be used. .It Ev no_proxy Same as .Ev NO_PROXY , for compatibility. .It Ev SSL_ALLOW_SSL3 Allow SSL version 3 when negotiating the connection (not recommended). .It Ev SSL_CA_CERT_FILE CA certificate bundle containing trusted CA certificates. Default value: See HTTPS SCHEME above. .It Ev SSL_CA_CERT_PATH Path containing trusted CA hashes. .It Ev SSL_CLIENT_CERT_FILE PEM encoded client certificate/key which will be used in client certificate authentication. .It Ev SSL_CLIENT_KEY_FILE PEM encoded client key in case key and client certificate are stored separately. .It Ev SSL_CRL_FILE File containing certificate revocation list. .It Ev SSL_NO_TLS1 Do not allow TLS version 1.0 when negotiating the connection. .It Ev SSL_NO_TLS1_1 Do not allow TLS version 1.1 when negotiating the connection. .It Ev SSL_NO_TLS1_2 Do not allow TLS version 1.2 when negotiating the connection. .It Ev SSL_NO_VERIFY_HOSTNAME If set, do not verify that the hostname matches the subject of the certificate presented by the server. .It Ev SSL_NO_VERIFY_PEER If set, do not verify the peer certificate against trusted CAs. .El .Sh EXAMPLES To access a proxy server on .Pa proxy.example.com port 8080, set the .Ev HTTP_PROXY environment variable in a manner similar to this: .Pp .Dl HTTP_PROXY=http://proxy.example.com:8080 .Pp If the proxy server requires authentication, there are two options available for passing the authentication data. The first method is by using the proxy URL: .Pp .Dl HTTP_PROXY=http://:@proxy.example.com:8080 .Pp The second method is by using the .Ev HTTP_PROXY_AUTH environment variable: .Bd -literal -offset indent HTTP_PROXY=http://proxy.example.com:8080 HTTP_PROXY_AUTH=basic:*:: .Ed .Pp To disable the use of a proxy for an HTTP server running on the local host, define .Ev NO_PROXY as follows: .Bd -literal -offset indent NO_PROXY=localhost,127.0.0.1 .Ed .Pp Access HTTPS website without any certificate verification whatsoever: .Bd -literal -offset indent SSL_NO_VERIFY_PEER=1 SSL_NO_VERIFY_HOSTNAME=1 .Ed .Pp Access HTTPS website using client certificate based authentication and a private CA: .Bd -literal -offset indent SSL_CLIENT_CERT_FILE=/path/to/client.pem SSL_CA_CERT_FILE=/path/to/myca.pem .Ed .Sh SEE ALSO .Xr fetch 1 , .Xr ip 4 .Rs .%A J. Postel .%A J. K. Reynolds .%D October 1985 .%B File Transfer Protocol .%O RFC959 .Re .Rs .%A P. Deutsch .%A A. Emtage .%A A. Marine. .%D May 1994 .%T How to Use Anonymous FTP .%O RFC1635 .Re .Rs .%A T. Berners-Lee .%A L. Masinter .%A M. McCahill .%D December 1994 .%T Uniform Resource Locators (URL) .%O RFC1738 .Re .Rs .%A R. Fielding .%A J. Gettys .%A J. Mogul .%A H. Frystyk .%A L. Masinter .%A P. Leach .%A T. Berners-Lee .%D January 1999 .%B Hypertext Transfer Protocol -- HTTP/1.1 .%O RFC2616 .Re .Rs .%A J. Franks .%A P. Hallam-Baker .%A J. Hostetler .%A S. Lawrence .%A P. Leach .%A A. Luotonen .%A L. Stewart .%D June 1999 .%B HTTP Authentication: Basic and Digest Access Authentication .%O RFC2617 .Re .Sh HISTORY The .Nm fetch library first appeared in .Fx 3.0 . .Sh AUTHORS .An -nosplit The .Nm fetch library was mostly written by .An Dag-Erling Sm\(/orgrav Aq Mt des@FreeBSD.org with numerous suggestions and contributions from .An Jordan K. Hubbard Aq Mt jkh@FreeBSD.org , .An Eugene Skepner Aq Mt eu@qub.com , .An Hajimu Umemoto Aq Mt ume@FreeBSD.org , .An Henry Whincup Aq Mt henry@techiebod.com , .An Jukka A. Ukkonen Aq Mt jau@iki.fi , .An Jean-Fran\(,cois Dockes Aq Mt jf@dockes.org , .An Michael Gmelin Aq Mt freebsd@grem.de and others. It replaces the older .Nm ftpio library written by .An Poul-Henning Kamp Aq Mt phk@FreeBSD.org and .An Jordan K. Hubbard Aq Mt jkh@FreeBSD.org . .Pp This manual page was written by .An Dag-Erling Sm\(/orgrav Aq Mt des@FreeBSD.org and .An Michael Gmelin Aq Mt freebsd@grem.de . .Sh BUGS Some parts of the library are not yet implemented. The most notable examples of this are .Fn fetchPutHTTP , .Fn fetchListHTTP , .Fn fetchListFTP and FTP proxy support. .Pp There is no way to select a proxy at run-time other than setting the .Ev HTTP_PROXY or .Ev FTP_PROXY environment variables as appropriate. .Pp .Nm libfetch does not understand or obey 305 (Use Proxy) replies. .Pp Error numbers are unique only within a certain context; the error codes used for FTP and HTTP overlap, as do those used for resolver and system errors. For instance, error code 202 means "Command not implemented, superfluous at this site" in an FTP context and "Accepted" in an HTTP context. .Pp .Fn fetchStatFTP does not check that the result of an MDTM command is a valid date. .Pp In case password protected keys are used for client certificate based authentication the user is prompted for the password on each and every fetch operation. .Pp The man page is incomplete, poorly written and produces badly formatted text. .Pp The error reporting mechanism is unsatisfactory. .Pp Some parts of the code are not fully reentrant. Index: head/lib/libfetch/http.c =================================================================== --- head/lib/libfetch/http.c (revision 351572) +++ head/lib/libfetch/http.c (revision 351573) @@ -1,2103 +1,2106 @@ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2000-2014 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("$FreeBSD$"); /* * The following copyright applies to the base64 code: * *- * Copyright 1997 Massachusetts Institute of Technology * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby * granted, provided that both the above copyright notice and this * permission notice appear in all copies, that both the above * copyright notice and this permission notice appear in all * supporting documentation, and that the name of M.I.T. not be used * in advertising or publicity pertaining to distribution of the * software without specific, written prior permission. M.I.T. makes * no representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied * warranty. * * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT * SHALL M.I.T. 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef WITH_SSL #include #define MD5Init(c) MD5_Init(c) #define MD5Update(c, data, len) MD5_Update(c, data, len) #define MD5Final(md, c) MD5_Final(md, c) #else #include #endif #include #include #include "fetch.h" #include "common.h" #include "httperr.h" /* Maximum number of redirects to follow */ #define MAX_REDIRECT 20 /* Symbolic names for reply codes we care about */ #define HTTP_OK 200 #define HTTP_PARTIAL 206 #define HTTP_MOVED_PERM 301 #define HTTP_MOVED_TEMP 302 #define HTTP_SEE_OTHER 303 #define HTTP_NOT_MODIFIED 304 #define HTTP_USE_PROXY 305 #define HTTP_TEMP_REDIRECT 307 #define HTTP_PERM_REDIRECT 308 #define HTTP_NEED_AUTH 401 #define HTTP_NEED_PROXY_AUTH 407 #define HTTP_BAD_RANGE 416 #define HTTP_PROTOCOL_ERROR 999 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ || (xyz) == HTTP_MOVED_TEMP \ || (xyz) == HTTP_TEMP_REDIRECT \ || (xyz) == HTTP_PERM_REDIRECT \ || (xyz) == HTTP_USE_PROXY \ || (xyz) == HTTP_SEE_OTHER) #define HTTP_ERROR(xyz) ((xyz) >= 400 && (xyz) <= 599) /***************************************************************************** * I/O functions for decoding chunked streams */ struct httpio { conn_t *conn; /* connection */ int chunked; /* chunked mode */ char *buf; /* chunk buffer */ size_t bufsize; /* size of chunk buffer */ size_t buflen; /* amount of data currently in buffer */ size_t bufpos; /* current read offset in buffer */ int eof; /* end-of-file flag */ int error; /* error flag */ size_t chunksize; /* remaining size of current chunk */ #ifndef NDEBUG size_t total; #endif }; /* * Get next chunk header */ static int http_new_chunk(struct httpio *io) { char *p; if (fetch_getln(io->conn) == -1) return (-1); if (io->conn->buflen < 2 || !isxdigit((unsigned char)*io->conn->buf)) return (-1); for (p = io->conn->buf; *p && !isspace((unsigned char)*p); ++p) { if (*p == ';') break; if (!isxdigit((unsigned char)*p)) return (-1); if (isdigit((unsigned char)*p)) { io->chunksize = io->chunksize * 16 + *p - '0'; } else { io->chunksize = io->chunksize * 16 + 10 + tolower((unsigned char)*p) - 'a'; } } #ifndef NDEBUG if (fetchDebug) { io->total += io->chunksize; if (io->chunksize == 0) fprintf(stderr, "%s(): end of last chunk\n", __func__); else fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", __func__, (unsigned long)io->chunksize, (unsigned long)io->total); } #endif return (io->chunksize); } /* * Grow the input buffer to at least len bytes */ static inline int http_growbuf(struct httpio *io, size_t len) { char *tmp; if (io->bufsize >= len) return (0); if ((tmp = realloc(io->buf, len)) == NULL) return (-1); io->buf = tmp; io->bufsize = len; return (0); } /* * Fill the input buffer, do chunk decoding on the fly */ static ssize_t http_fillbuf(struct httpio *io, size_t len) { ssize_t nbytes; char ch; if (io->error) return (-1); if (io->eof) return (0); /* not chunked: just fetch the requested amount */ if (io->chunked == 0) { if (http_growbuf(io, len) == -1) return (-1); if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { io->error = errno; return (-1); } io->buflen = nbytes; io->bufpos = 0; return (io->buflen); } /* chunked, but we ran out: get the next chunk header */ if (io->chunksize == 0) { switch (http_new_chunk(io)) { case -1: io->error = EPROTO; return (-1); case 0: io->eof = 1; return (0); } } /* fetch the requested amount, but no more than the current chunk */ if (len > io->chunksize) len = io->chunksize; if (http_growbuf(io, len) == -1) return (-1); if ((nbytes = fetch_read(io->conn, io->buf, len)) == -1) { io->error = errno; return (-1); } io->bufpos = 0; io->buflen = nbytes; io->chunksize -= nbytes; if (io->chunksize == 0) { if (fetch_read(io->conn, &ch, 1) != 1 || ch != '\r' || fetch_read(io->conn, &ch, 1) != 1 || ch != '\n') return (-1); } return (io->buflen); } /* * Read function */ static int http_readfn(void *v, char *buf, int len) { struct httpio *io = (struct httpio *)v; int rlen; if (io->error) return (-1); if (io->eof) return (0); /* empty buffer */ if (!io->buf || io->bufpos == io->buflen) { if ((rlen = http_fillbuf(io, len)) < 0) { if ((errno = io->error) == EINTR) io->error = 0; return (-1); } else if (rlen == 0) { return (0); } } rlen = io->buflen - io->bufpos; if (len < rlen) rlen = len; memcpy(buf, io->buf + io->bufpos, rlen); io->bufpos += rlen; return (rlen); } /* * Write function */ static int http_writefn(void *v, const char *buf, int len) { struct httpio *io = (struct httpio *)v; return (fetch_write(io->conn, buf, len)); } /* * Close function */ static int http_closefn(void *v) { struct httpio *io = (struct httpio *)v; int r; r = fetch_close(io->conn); if (io->buf) free(io->buf); free(io); return (r); } /* * Wrap a file descriptor up */ static FILE * http_funopen(conn_t *conn, int chunked) { struct httpio *io; FILE *f; if ((io = calloc(1, sizeof(*io))) == NULL) { fetch_syserr(); return (NULL); } io->conn = conn; io->chunked = chunked; f = funopen(io, http_readfn, http_writefn, NULL, http_closefn); if (f == NULL) { fetch_syserr(); free(io); return (NULL); } return (f); } /***************************************************************************** * Helper functions for talking to the server and parsing its replies */ /* Header types */ typedef enum { hdr_syserror = -2, hdr_error = -1, hdr_end = 0, hdr_unknown = 1, hdr_content_length, hdr_content_range, hdr_last_modified, hdr_location, hdr_transfer_encoding, hdr_www_authenticate, hdr_proxy_authenticate, } hdr_t; /* Names of interesting headers */ static struct { hdr_t num; const char *name; } hdr_names[] = { { hdr_content_length, "Content-Length" }, { hdr_content_range, "Content-Range" }, { hdr_last_modified, "Last-Modified" }, { hdr_location, "Location" }, { hdr_transfer_encoding, "Transfer-Encoding" }, { hdr_www_authenticate, "WWW-Authenticate" }, { hdr_proxy_authenticate, "Proxy-Authenticate" }, { hdr_unknown, NULL }, }; /* * Send a formatted line; optionally echo to terminal */ static int http_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 (0); } /* * Get and parse status line */ static int http_get_reply(conn_t *conn) { char *p; if (fetch_getln(conn) == -1) return (-1); /* * A valid status line looks like "HTTP/m.n xyz reason" where m * and n are the major and minor protocol version numbers and xyz * is the reply code. * Unfortunately, there are servers out there (NCSA 1.5.1, to name * just one) that do not send a version number, so we can't rely * on finding one, but if we do, insist on it being 1.0 or 1.1. * We don't care about the reason phrase. */ if (strncmp(conn->buf, "HTTP", 4) != 0) return (HTTP_PROTOCOL_ERROR); p = conn->buf + 4; if (*p == '/') { if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) return (HTTP_PROTOCOL_ERROR); p += 4; } if (*p != ' ' || !isdigit((unsigned char)p[1]) || !isdigit((unsigned char)p[2]) || !isdigit((unsigned char)p[3])) return (HTTP_PROTOCOL_ERROR); conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); return (conn->err); } /* * Check a header; if the type matches the given string, return a pointer * to the beginning of the value. */ static const char * http_match(const char *str, const char *hdr) { while (*str && *hdr && tolower((unsigned char)*str++) == tolower((unsigned char)*hdr++)) /* nothing */; if (*str || *hdr != ':') return (NULL); while (*hdr && isspace((unsigned char)*++hdr)) /* nothing */; return (hdr); } /* * Get the next header and return the appropriate symbolic code. We * need to read one line ahead for checking for a continuation line * belonging to the current header (continuation lines start with * white space). * * We get called with a fresh line already in the conn buffer, either * from the previous http_next_header() invocation, or, the first * time, from a fetch_getln() performed by our caller. * * This stops when we encounter an empty line (we dont read beyond the header * area). * * Note that the "headerbuf" is just a place to return the result. Its * contents are not used for the next call. This means that no cleanup * is needed when ie doing another connection, just call the cleanup when * fully done to deallocate memory. */ /* Limit the max number of continuation lines to some reasonable value */ #define HTTP_MAX_CONT_LINES 10 /* Place into which to build a header from one or several lines */ typedef struct { char *buf; /* buffer */ size_t bufsize; /* buffer size */ size_t buflen; /* length of buffer contents */ } http_headerbuf_t; static void init_http_headerbuf(http_headerbuf_t *buf) { buf->buf = NULL; buf->bufsize = 0; buf->buflen = 0; } static void clean_http_headerbuf(http_headerbuf_t *buf) { if (buf->buf) free(buf->buf); init_http_headerbuf(buf); } /* Remove whitespace at the end of the buffer */ static void http_conn_trimright(conn_t *conn) { while (conn->buflen && isspace((unsigned char)conn->buf[conn->buflen - 1])) conn->buflen--; conn->buf[conn->buflen] = '\0'; } static hdr_t http_next_header(conn_t *conn, http_headerbuf_t *hbuf, const char **p) { unsigned int i, len; /* * Have to do the stripping here because of the first line. So * it's done twice for the subsequent lines. No big deal */ http_conn_trimright(conn); if (conn->buflen == 0) return (hdr_end); /* Copy the line to the headerbuf */ if (hbuf->bufsize < conn->buflen + 1) { if ((hbuf->buf = realloc(hbuf->buf, conn->buflen + 1)) == NULL) return (hdr_syserror); hbuf->bufsize = conn->buflen + 1; } strcpy(hbuf->buf, conn->buf); hbuf->buflen = conn->buflen; /* * Fetch possible continuation lines. Stop at 1st non-continuation * and leave it in the conn buffer */ for (i = 0; i < HTTP_MAX_CONT_LINES; i++) { if (fetch_getln(conn) == -1) return (hdr_syserror); /* * Note: we carry on the idea from the previous version * that a pure whitespace line is equivalent to an empty * one (so it's not continuation and will be handled when * we are called next) */ http_conn_trimright(conn); if (conn->buf[0] != ' ' && conn->buf[0] != "\t"[0]) break; /* Got a continuation line. Concatenate to previous */ len = hbuf->buflen + conn->buflen; if (hbuf->bufsize < len + 1) { len *= 2; if ((hbuf->buf = realloc(hbuf->buf, len + 1)) == NULL) return (hdr_syserror); hbuf->bufsize = len + 1; } strcpy(hbuf->buf + hbuf->buflen, conn->buf); hbuf->buflen += conn->buflen; } /* * We could check for malformed headers but we don't really care. * A valid header starts with a token immediately followed by a * colon; a token is any sequence of non-control, non-whitespace * characters except "()<>@,;:\\\"{}". */ for (i = 0; hdr_names[i].num != hdr_unknown; i++) if ((*p = http_match(hdr_names[i].name, hbuf->buf)) != NULL) return (hdr_names[i].num); return (hdr_unknown); } /************************** * [Proxy-]Authenticate header parsing */ /* * Read doublequote-delimited string into output buffer obuf (allocated * by caller, whose responsibility it is to ensure that it's big enough) * cp points to the first char after the initial '"' * Handles \ quoting * Returns pointer to the first char after the terminating double quote, or * NULL for error. */ static const char * http_parse_headerstring(const char *cp, char *obuf) { for (;;) { switch (*cp) { case 0: /* Unterminated string */ *obuf = 0; return (NULL); case '"': /* Ending quote */ *obuf = 0; return (++cp); case '\\': if (*++cp == 0) { *obuf = 0; return (NULL); } /* FALLTHROUGH */ default: *obuf++ = *cp++; } } } /* Http auth challenge schemes */ typedef enum {HTTPAS_UNKNOWN, HTTPAS_BASIC,HTTPAS_DIGEST} http_auth_schemes_t; /* Data holder for a Basic or Digest challenge. */ typedef struct { http_auth_schemes_t scheme; char *realm; char *qop; char *nonce; char *opaque; char *algo; int stale; int nc; /* Nonce count */ } http_auth_challenge_t; static void init_http_auth_challenge(http_auth_challenge_t *b) { b->scheme = HTTPAS_UNKNOWN; b->realm = b->qop = b->nonce = b->opaque = b->algo = NULL; b->stale = b->nc = 0; } static void clean_http_auth_challenge(http_auth_challenge_t *b) { if (b->realm) free(b->realm); if (b->qop) free(b->qop); if (b->nonce) free(b->nonce); if (b->opaque) free(b->opaque); if (b->algo) free(b->algo); init_http_auth_challenge(b); } /* Data holder for an array of challenges offered in an http response. */ #define MAX_CHALLENGES 10 typedef struct { http_auth_challenge_t *challenges[MAX_CHALLENGES]; int count; /* Number of parsed challenges in the array */ int valid; /* We did parse an authenticate header */ } http_auth_challenges_t; static void init_http_auth_challenges(http_auth_challenges_t *cs) { int i; for (i = 0; i < MAX_CHALLENGES; i++) cs->challenges[i] = NULL; cs->count = cs->valid = 0; } static void clean_http_auth_challenges(http_auth_challenges_t *cs) { int i; /* We rely on non-zero pointers being allocated, not on the count */ for (i = 0; i < MAX_CHALLENGES; i++) { if (cs->challenges[i] != NULL) { clean_http_auth_challenge(cs->challenges[i]); free(cs->challenges[i]); } } init_http_auth_challenges(cs); } /* * Enumeration for lexical elements. Separators will be returned as their own * ascii value */ typedef enum {HTTPHL_WORD=256, HTTPHL_STRING=257, HTTPHL_END=258, HTTPHL_ERROR = 259} http_header_lex_t; /* * Determine what kind of token comes next and return possible value * in buf, which is supposed to have been allocated big enough by * caller. Advance input pointer and return element type. */ static int http_header_lex(const char **cpp, char *buf) { size_t l; /* Eat initial whitespace */ *cpp += strspn(*cpp, " \t"); if (**cpp == 0) return (HTTPHL_END); /* Separator ? */ if (**cpp == ',' || **cpp == '=') return (*((*cpp)++)); /* String ? */ if (**cpp == '"') { *cpp = http_parse_headerstring(++*cpp, buf); if (*cpp == NULL) return (HTTPHL_ERROR); return (HTTPHL_STRING); } /* Read other token, until separator or whitespace */ l = strcspn(*cpp, " \t,="); memcpy(buf, *cpp, l); buf[l] = 0; *cpp += l; return (HTTPHL_WORD); } /* * Read challenges from http xxx-authenticate header and accumulate them * in the challenges list structure. * * Headers with multiple challenges are specified by rfc2617, but * servers (ie: squid) often send them in separate headers instead, * which in turn is forbidden by the http spec (multiple headers with * the same name are only allowed for pure comma-separated lists, see * rfc2616 sec 4.2). * * We support both approaches anyway */ static int http_parse_authenticate(const char *cp, http_auth_challenges_t *cs) { int ret = -1; http_header_lex_t lex; char *key = malloc(strlen(cp) + 1); char *value = malloc(strlen(cp) + 1); char *buf = malloc(strlen(cp) + 1); if (key == NULL || value == NULL || buf == NULL) { fetch_syserr(); goto out; } /* In any case we've seen the header and we set the valid bit */ cs->valid = 1; /* Need word first */ lex = http_header_lex(&cp, key); if (lex != HTTPHL_WORD) goto out; /* Loop on challenges */ for (; cs->count < MAX_CHALLENGES; cs->count++) { cs->challenges[cs->count] = malloc(sizeof(http_auth_challenge_t)); if (cs->challenges[cs->count] == NULL) { fetch_syserr(); goto out; } init_http_auth_challenge(cs->challenges[cs->count]); if (strcasecmp(key, "basic") == 0) { cs->challenges[cs->count]->scheme = HTTPAS_BASIC; } else if (strcasecmp(key, "digest") == 0) { cs->challenges[cs->count]->scheme = HTTPAS_DIGEST; } else { cs->challenges[cs->count]->scheme = HTTPAS_UNKNOWN; /* * Continue parsing as basic or digest may * follow, and the syntax is the same for * all. We'll just ignore this one when * looking at the list */ } /* Loop on attributes */ for (;;) { /* Key */ lex = http_header_lex(&cp, key); if (lex != HTTPHL_WORD) goto out; /* Equal sign */ lex = http_header_lex(&cp, buf); if (lex != '=') goto out; /* Value */ lex = http_header_lex(&cp, value); if (lex != HTTPHL_WORD && lex != HTTPHL_STRING) goto out; if (strcasecmp(key, "realm") == 0) { cs->challenges[cs->count]->realm = strdup(value); } else if (strcasecmp(key, "qop") == 0) { cs->challenges[cs->count]->qop = strdup(value); } else if (strcasecmp(key, "nonce") == 0) { cs->challenges[cs->count]->nonce = strdup(value); } else if (strcasecmp(key, "opaque") == 0) { cs->challenges[cs->count]->opaque = strdup(value); } else if (strcasecmp(key, "algorithm") == 0) { cs->challenges[cs->count]->algo = strdup(value); } else if (strcasecmp(key, "stale") == 0) { cs->challenges[cs->count]->stale = strcasecmp(value, "no"); } else { /* ignore unknown attributes */ } /* Comma or Next challenge or End */ lex = http_header_lex(&cp, key); /* * If we get a word here, this is the beginning of the * next challenge. Break the attributes loop */ if (lex == HTTPHL_WORD) break; if (lex == HTTPHL_END) { /* End while looking for ',' is normal exit */ cs->count++; ret = 0; goto out; } /* Anything else is an error */ if (lex != ',') goto out; } /* End attributes loop */ } /* End challenge loop */ /* * Challenges max count exceeded. This really can't happen * with normal data, something's fishy -> error */ out: if (key) free(key); if (value) free(value); if (buf) free(buf); return (ret); } /* * Parse a last-modified header */ static int http_parse_mtime(const char *p, time_t *mtime) { char locale[64], *r; struct tm tm; strlcpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); setlocale(LC_TIME, "C"); r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); /* * Some proxies use UTC in response, but it should still be * parsed. RFC2616 states GMT and UTC are exactly equal for HTTP. */ if (r == NULL) r = strptime(p, "%a, %d %b %Y %H:%M:%S UTC", &tm); /* XXX should add support for date-2 and date-3 */ setlocale(LC_TIME, locale); if (r == NULL) return (-1); 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); *mtime = timegm(&tm); return (0); } /* * Parse a content-length header */ static int http_parse_length(const char *p, off_t *length) { off_t len; for (len = 0; *p && isdigit((unsigned char)*p); ++p) len = len * 10 + (*p - '0'); if (*p) return (-1); DEBUGF("content length: [%lld]\n", (long long)len); *length = len; return (0); } /* * Parse a content-range header */ static int http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) { off_t first, last, len; if (strncasecmp(p, "bytes ", 6) != 0) return (-1); p += 6; if (*p == '*') { first = last = -1; ++p; } else { for (first = 0; *p && isdigit((unsigned char)*p); ++p) first = first * 10 + *p - '0'; if (*p != '-') return (-1); for (last = 0, ++p; *p && isdigit((unsigned char)*p); ++p) last = last * 10 + *p - '0'; } if (first > last || *p != '/') return (-1); for (len = 0, ++p; *p && isdigit((unsigned char)*p); ++p) len = len * 10 + *p - '0'; if (*p || len < last - first + 1) return (-1); if (first == -1) { DEBUGF("content range: [*/%lld]\n", (long long)len); *length = 0; } else { DEBUGF("content range: [%lld-%lld/%lld]\n", (long long)first, (long long)last, (long long)len); *length = last - first + 1; } *offset = first; *size = len; return (0); } /***************************************************************************** * Helper functions for authorization */ /* * Base64 encoding */ static char * http_base64(const char *src) { static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz" "0123456789+/"; char *str, *dst; size_t l; int t, r; l = strlen(src); if ((str = malloc(((l + 2) / 3) * 4 + 1)) == NULL) return (NULL); dst = str; r = 0; while (l >= 3) { t = (src[0] << 16) | (src[1] << 8) | src[2]; dst[0] = base64[(t >> 18) & 0x3f]; dst[1] = base64[(t >> 12) & 0x3f]; dst[2] = base64[(t >> 6) & 0x3f]; dst[3] = base64[(t >> 0) & 0x3f]; src += 3; l -= 3; dst += 4; r += 4; } switch (l) { case 2: t = (src[0] << 16) | (src[1] << 8); dst[0] = base64[(t >> 18) & 0x3f]; dst[1] = base64[(t >> 12) & 0x3f]; dst[2] = base64[(t >> 6) & 0x3f]; dst[3] = '='; dst += 4; r += 4; break; case 1: t = src[0] << 16; dst[0] = base64[(t >> 18) & 0x3f]; dst[1] = base64[(t >> 12) & 0x3f]; dst[2] = dst[3] = '='; dst += 4; r += 4; break; case 0: break; } *dst = 0; return (str); } /* * Extract authorization parameters from environment value. * The value is like scheme:realm:user:pass */ typedef struct { char *scheme; char *realm; char *user; char *password; } http_auth_params_t; static void init_http_auth_params(http_auth_params_t *s) { s->scheme = s->realm = s->user = s->password = NULL; } static void clean_http_auth_params(http_auth_params_t *s) { if (s->scheme) free(s->scheme); if (s->realm) free(s->realm); if (s->user) free(s->user); if (s->password) free(s->password); init_http_auth_params(s); } static int http_authfromenv(const char *p, http_auth_params_t *parms) { int ret = -1; char *v, *ve; char *str = strdup(p); if (str == NULL) { fetch_syserr(); return (-1); } v = str; if ((ve = strchr(v, ':')) == NULL) goto out; *ve = 0; if ((parms->scheme = strdup(v)) == NULL) { fetch_syserr(); goto out; } v = ve + 1; if ((ve = strchr(v, ':')) == NULL) goto out; *ve = 0; if ((parms->realm = strdup(v)) == NULL) { fetch_syserr(); goto out; } v = ve + 1; if ((ve = strchr(v, ':')) == NULL) goto out; *ve = 0; if ((parms->user = strdup(v)) == NULL) { fetch_syserr(); goto out; } v = ve + 1; if ((parms->password = strdup(v)) == NULL) { fetch_syserr(); goto out; } ret = 0; out: if (ret == -1) clean_http_auth_params(parms); if (str) free(str); return (ret); } /* * Digest response: the code to compute the digest is taken from the * sample implementation in RFC2616 */ #define IN const #define OUT #define HASHLEN 16 typedef char HASH[HASHLEN]; #define HASHHEXLEN 32 typedef char HASHHEX[HASHHEXLEN+1]; static const char *hexchars = "0123456789abcdef"; static void CvtHex(IN HASH Bin, OUT HASHHEX Hex) { unsigned short i; unsigned char j; for (i = 0; i < HASHLEN; i++) { j = (Bin[i] >> 4) & 0xf; Hex[i*2] = hexchars[j]; j = Bin[i] & 0xf; Hex[i*2+1] = hexchars[j]; } Hex[HASHHEXLEN] = '\0'; }; /* calculate H(A1) as per spec */ static void DigestCalcHA1( IN char * pszAlg, IN char * pszUserName, IN char * pszRealm, IN char * pszPassword, IN char * pszNonce, IN char * pszCNonce, OUT HASHHEX SessionKey ) { MD5_CTX Md5Ctx; HASH HA1; MD5Init(&Md5Ctx); MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword)); MD5Final(HA1, &Md5Ctx); if (strcasecmp(pszAlg, "md5-sess") == 0) { MD5Init(&Md5Ctx); MD5Update(&Md5Ctx, HA1, HASHLEN); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); MD5Final(HA1, &Md5Ctx); } CvtHex(HA1, SessionKey); } /* calculate request-digest/response-digest as per HTTP Digest spec */ static void DigestCalcResponse( IN HASHHEX HA1, /* H(A1) */ IN char * pszNonce, /* nonce from server */ IN char * pszNonceCount, /* 8 hex digits */ IN char * pszCNonce, /* client nonce */ IN char * pszQop, /* qop-value: "", "auth", "auth-int" */ IN char * pszMethod, /* method from the request */ IN char * pszDigestUri, /* requested URL */ IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */ OUT HASHHEX Response /* request-digest or response-digest */ ) { #if 0 DEBUGF("Calc: HA1[%s] Nonce[%s] qop[%s] method[%s] URI[%s]\n", HA1, pszNonce, pszQop, pszMethod, pszDigestUri); #endif MD5_CTX Md5Ctx; HASH HA2; HASH RespHash; HASHHEX HA2Hex; // calculate H(A2) MD5Init(&Md5Ctx); MD5Update(&Md5Ctx, pszMethod, strlen(pszMethod)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszDigestUri, strlen(pszDigestUri)); if (strcasecmp(pszQop, "auth-int") == 0) { MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, HEntity, HASHHEXLEN); } MD5Final(HA2, &Md5Ctx); CvtHex(HA2, HA2Hex); // calculate response MD5Init(&Md5Ctx); MD5Update(&Md5Ctx, HA1, HASHHEXLEN); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce)); MD5Update(&Md5Ctx, ":", 1); if (*pszQop) { MD5Update(&Md5Ctx, pszNonceCount, strlen(pszNonceCount)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce)); MD5Update(&Md5Ctx, ":", 1); MD5Update(&Md5Ctx, pszQop, strlen(pszQop)); MD5Update(&Md5Ctx, ":", 1); } MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN); MD5Final(RespHash, &Md5Ctx); CvtHex(RespHash, Response); } /* * Generate/Send a Digest authorization header * This looks like: [Proxy-]Authorization: credentials * * credentials = "Digest" digest-response * digest-response = 1#( username | realm | nonce | digest-uri * | response | [ algorithm ] | [cnonce] | * [opaque] | [message-qop] | * [nonce-count] | [auth-param] ) * username = "username" "=" username-value * username-value = quoted-string * digest-uri = "uri" "=" digest-uri-value * digest-uri-value = request-uri ; As specified by HTTP/1.1 * message-qop = "qop" "=" qop-value * cnonce = "cnonce" "=" cnonce-value * cnonce-value = nonce-value * nonce-count = "nc" "=" nc-value * nc-value = 8LHEX * response = "response" "=" request-digest * request-digest = <"> 32LHEX <"> */ static int http_digest_auth(conn_t *conn, const char *hdr, http_auth_challenge_t *c, http_auth_params_t *parms, struct url *url) { int r; char noncecount[10]; char cnonce[40]; char *options = NULL; if (!c->realm || !c->nonce) { DEBUGF("realm/nonce not set in challenge\n"); return(-1); } if (!c->algo) c->algo = strdup(""); if (asprintf(&options, "%s%s%s%s", *c->algo? ",algorithm=" : "", c->algo, c->opaque? ",opaque=" : "", c->opaque?c->opaque:"") < 0) return (-1); if (!c->qop) { c->qop = strdup(""); *noncecount = 0; *cnonce = 0; } else { c->nc++; sprintf(noncecount, "%08x", c->nc); /* We don't try very hard with the cnonce ... */ sprintf(cnonce, "%x%lx", getpid(), (unsigned long)time(0)); } HASHHEX HA1; DigestCalcHA1(c->algo, parms->user, c->realm, parms->password, c->nonce, cnonce, HA1); DEBUGF("HA1: [%s]\n", HA1); HASHHEX digest; DigestCalcResponse(HA1, c->nonce, noncecount, cnonce, c->qop, "GET", url->doc, "", digest); if (c->qop[0]) { r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," "nonce=\"%s\",uri=\"%s\",response=\"%s\"," "qop=\"auth\", cnonce=\"%s\", nc=%s%s", hdr, parms->user, c->realm, c->nonce, url->doc, digest, cnonce, noncecount, options); } else { r = http_cmd(conn, "%s: Digest username=\"%s\",realm=\"%s\"," "nonce=\"%s\",uri=\"%s\",response=\"%s\"%s", hdr, parms->user, c->realm, c->nonce, url->doc, digest, options); } if (options) free(options); return (r); } /* * Encode username and password */ static int http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) { char *upw, *auth; int r; DEBUGF("basic: usr: [%s]\n", usr); DEBUGF("basic: pwd: [%s]\n", pwd); if (asprintf(&upw, "%s:%s", usr, pwd) == -1) return (-1); auth = http_base64(upw); free(upw); if (auth == NULL) return (-1); r = http_cmd(conn, "%s: Basic %s", hdr, auth); free(auth); return (r); } /* * Chose the challenge to answer and call the appropriate routine to * produce the header. */ static int http_authorize(conn_t *conn, const char *hdr, http_auth_challenges_t *cs, http_auth_params_t *parms, struct url *url) { http_auth_challenge_t *digest = NULL; int i; /* If user or pass are null we're not happy */ if (!parms->user || !parms->password) { DEBUGF("NULL usr or pass\n"); return (-1); } /* Look for a Digest */ for (i = 0; i < cs->count; i++) { if (cs->challenges[i]->scheme == HTTPAS_DIGEST) digest = cs->challenges[i]; } /* Error if "Digest" was specified and there is no Digest challenge */ if (!digest && (parms->scheme && strcasecmp(parms->scheme, "digest") == 0)) { DEBUGF("Digest auth in env, not supported by peer\n"); return (-1); } /* * If "basic" was specified in the environment, or there is no Digest * challenge, do the basic thing. Don't need a challenge for this, * so no need to check basic!=NULL */ if (!digest || (parms->scheme && strcasecmp(parms->scheme, "basic") == 0)) return (http_basic_auth(conn,hdr,parms->user,parms->password)); /* Else, prefer digest. We just checked that it's not NULL */ return (http_digest_auth(conn, hdr, digest, parms, url)); } /***************************************************************************** * Helper functions for connecting to a server or proxy */ /* * Connect to the correct HTTP server or proxy. */ static conn_t * http_connect(struct url *URL, struct url *purl, const char *flags) { struct url *curl; conn_t *conn; hdr_t h; http_headerbuf_t headerbuf; const char *p; int verbose; int af, val; int serrno; #ifdef INET6 af = AF_UNSPEC; #else af = AF_INET; #endif verbose = CHECK_FLAG('v'); if (CHECK_FLAG('4')) af = AF_INET; #ifdef INET6 else if (CHECK_FLAG('6')) af = AF_INET6; #endif curl = (purl != NULL) ? purl : URL; if ((conn = fetch_connect(curl->host, curl->port, af, verbose)) == NULL) /* fetch_connect() has already set an error code */ return (NULL); init_http_headerbuf(&headerbuf); if (strcmp(URL->scheme, SCHEME_HTTPS) == 0 && purl) { http_cmd(conn, "CONNECT %s:%d HTTP/1.1", URL->host, URL->port); http_cmd(conn, "Host: %s:%d", URL->host, URL->port); http_cmd(conn, ""); if (http_get_reply(conn) != HTTP_OK) { http_seterr(conn->err); goto ouch; } /* Read and discard the rest of the proxy response */ if (fetch_getln(conn) < 0) { fetch_syserr(); goto ouch; } do { switch ((h = http_next_header(conn, &headerbuf, &p))) { case hdr_syserror: fetch_syserr(); goto ouch; case hdr_error: http_seterr(HTTP_PROTOCOL_ERROR); goto ouch; default: /* ignore */ ; } } while (h > hdr_end); } if (strcmp(URL->scheme, SCHEME_HTTPS) == 0 && fetch_ssl(conn, URL, verbose) == -1) { /* grrr */ errno = EAUTH; fetch_syserr(); goto ouch; } val = 1; setsockopt(conn->sd, IPPROTO_TCP, TCP_NOPUSH, &val, sizeof(val)); clean_http_headerbuf(&headerbuf); return (conn); ouch: serrno = errno; clean_http_headerbuf(&headerbuf); fetch_close(conn); errno = serrno; return (NULL); } static struct url * http_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("HTTP_PROXY")) || (p = getenv("http_proxy"))) && *p && (purl = fetchParseURL(p))) { if (!*purl->scheme) strcpy(purl->scheme, SCHEME_HTTP); if (!purl->port) purl->port = fetch_default_proxy_port(purl->scheme); if (strcmp(purl->scheme, SCHEME_HTTP) == 0) return (purl); fetchFreeURL(purl); } return (NULL); } static void http_print_html(FILE *out, FILE *in) { size_t len; char *line, *p, *q; int comment, tag; comment = tag = 0; while ((line = fgetln(in, &len)) != NULL) { while (len && isspace((unsigned char)line[len - 1])) --len; for (p = q = line; q < line + len; ++q) { if (comment && *q == '-') { if (q + 2 < line + len && strcmp(q, "-->") == 0) { tag = comment = 0; q += 2; } } else if (tag && !comment && *q == '>') { p = q + 1; tag = 0; } else if (!tag && *q == '<') { if (q > p) fwrite(p, q - p, 1, out); tag = 1; if (q + 3 < line + len && strcmp(q, "