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# Project Gemini ## Speculative specification v0.16.1, January 30th 2022 This is an increasingly less rough sketch of an actual spec for Project Gemini. Although not finalised yet, further changes to the specification are likely to be relatively small. You can write code to this pseudo-specification and be confident that it probably won't become totally non-functional due to massive changes next week, but you are still urged to keep an eye on ongoing development of the protocol and make changes as required. This is provided mostly so that people can quickly get up to speed on what I'm thinking without having to read lots and lots of old phlog posts and keep notes. Feedback on any part of this is extremely welcome, please email solderpunk@posteo.net. # Conventions used in this document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP14. # 1 Overview Gemini is a client-server protocol featuring request-response transactions, broadly similar to gopher or HTTP. Connections are closed at the end of a single transaction and cannot be reused. When Gemini is served over TCP/IP, servers should listen on port 1965 (the first manned Gemini mission, Gemini 3, flew in March '65). This is an unprivileged port, so it's very easy to run a server as a "nobody" user, even if e.g. the server is written in Go and so can't drop privileges in the traditional fashion. ## 1.1 Gemini transactions There is one kind of Gemini transaction, roughly equivalent to a gopher request or a HTTP "GET" request. Transactions happen as follows: C: Opens connection S: Accepts connection C/S: Complete TLS handshake (see section 4) C: Validates server certificate (see 4.2) C: Sends request (one CRLF terminated line) (see section 2) S: Sends response header (one CRLF terminated line), closes connection under non-success conditions (see 3.1 and 3.2) S: Sends response body (text or binary data) (see 3.3) S: Closes connection (including TLS close_notify, see section 4) C: Handles response (see 3.4) Note that clients are not obligated to wait until the server closes the connection to begin handling the response. This is shown above only for simplicity/clarity, to emphasise that responsibility for closing the connection under typical conditions lies with the server and that the connection should be closed immediately after the completion of the response body. ## 1.2 Gemini URI scheme Resources hosted via Gemini are identified using URIs with the scheme "gemini". This scheme is syntactically compatible with the generic URI syntax defined in RFC 3986, but does not support all components of the generic syntax. In particular, the authority component is allowed and required, but its userinfo subcomponent is NOT allowed. The host subcomponent is required. The port subcomponent is optional, with a default value of 1965. The path, query and fragment components are allowed and have no special meanings beyond those defined by the generic syntax. An empty path is equivalent to a path consisting only of "/". Spaces in paths should be encoded as %20, not as +. Clients SHOULD normalise URIs (as per section 6.2.3 of RFC 3986) before sending requests (see section 2) and servers SHOULD normalise received URIs before processing a request. # 2 Gemini requests Gemini requests are a single CRLF-terminated line with the following structure: <URL><CR><LF> <URL> is a UTF-8 encoded absolute URL, including a scheme, of maximum length 1024 bytes. The request MUST NOT begin with a U+FEFF byte order mark. Sending an absolute URL instead of only a path or selector is effectively equivalent to building in a HTTP "Host" header. It permits virtual hosting of multiple Gemini domains on the same IP address. It also allows servers to optionally act as proxies. Including schemes other than "gemini" in requests allows servers to optionally act as protocol-translating gateways to e.g. fetch gopher resources over Gemini. Proxying is optional and the vast majority of servers are expected to only respond to requests for resources at their own domain(s). Clients MUST NOT send anything after the first occurrence of <CR><LF> in a request, and servers MUST ignore anything sent after the first occurrence of a <CR><LF>. # 3 Gemini responses Gemini response consist of a single CRLF-terminated header line, optionally followed by a response body. ## 3.1 Response headers Gemini response headers look like this: <STATUS><SPACE><META><CR><LF> <STATUS> is a two-digit numeric status code, as described below in 3.2 and in Appendix 1. <SPACE> is a single space character, i.e. the byte 0x20. <META> is a UTF-8 encoded string of maximum length 1024 bytes, whose meaning is <STATUS> dependent. The response header as a whole and <META> as a sub-string both MUST NOT begin with a U+FEFF byte order mark. If <STATUS> does not belong to the "SUCCESS" range of codes, then the server MUST close the connection after sending the header and MUST NOT send a response body. If a server sends a <STATUS> which is not a two-digit number or a <META> which exceeds 1024 bytes in length, the client SHOULD close the connection and disregard the response header, informing the user of an error. ## 3.2 Status codes Gemini uses two-digit numeric status codes. Related status codes share the same first digit. Importantly, the first digit of Gemini status codes do not group codes into vague categories like "client error" and "server error" as per HTTP. Instead, the first digit alone provides enough information for a client to determine how to handle the response. By design, it is possible to write a simple but feature complete client which only looks at the first digit. The second digit provides more fine-grained information, for unambiguous server logging, to allow writing comfier interactive clients which provide a slightly more streamlined user interface, and to allow writing more robust and intelligent automated clients like content aggregators, search engine crawlers, etc. The first digit of a response code unambiguously places the response into one of six categories, which define the semantics of the <META> line. ### 3.2.1 1x (INPUT) Status codes beginning with 1 are INPUT status codes, meaning: The requested resource accepts a line of textual user input. The <META> line is a prompt which should be displayed to the user. The same resource should then be requested again with the user's input included as a query component. Queries are included in requests as per the usual generic URL definition in RFC3986, i.e. separated from the path by a ?. Reserved characters used in the user's input must be "percent-encoded" as per RFC3986, and space characters should also be percent-encoded. ### 3.2.2 2x (SUCCESS) Status codes beginning with 2 are SUCCESS status codes, meaning: The request was handled successfully and a response body will follow the response header. The <META> line is a MIME media type which applies to the response body. ### 3.2.3 3x (REDIRECT) Status codes beginning with 3 are REDIRECT status codes, meaning: The server is redirecting the client to a new location for the requested resource. There is no response body. <META> is a new URL for the requested resource. The URL may be absolute or relative. If relative, it should be resolved against the URL used in the original request. If the URL used in the original request contained a query string, the client MUST NOT apply this string to the redirect URL, instead using the redirect URL "as is". The redirect should be considered temporary, i.e. clients should continue to request the resource at the original address and should not perform convenience actions like automatically updating bookmarks. There is no response body. ### 3.2.4 4x (TEMPORARY FAILURE) Status codes beginning with 4 are TEMPORARY FAILURE status codes, meaning: The request has failed. There is no response body. The nature of the failure is temporary, i.e. an identical request MAY succeed in the future. The contents of <META> may provide additional information on the failure, and should be displayed to human users. ### 3.2.5 5x (PERMANENT FAILURE) Status codes beginning with 5 are PERMANENT FAILURE status codes, meaning: The request has failed. There is no response body. The nature of the failure is permanent, i.e. identical future requests will reliably fail for the same reason. The contents of <META> may provide additional information on the failure, and should be displayed to human users. Automatic clients such as aggregators or indexing crawlers should not repeat this request. ### 3.2.6 6x (CLIENT CERTIFICATE REQUIRED) Status codes beginning with 6 are CLIENT CERTIFICATE REQUIRED status codes, meaning: The requested resource requires a client certificate to access. If the request was made without a certificate, it should be repeated with one. If the request was made with a certificate, the server did not accept it and the request should be repeated with a different certificate. The contents of <META> (and/or the specific 6x code) may provide additional information on certificate requirements or the reason a certificate was rejected. ### 3.2.7 Notes Note that for basic interactive clients for human use, errors 4 and 5 may be effectively handled identically, by simply displaying the contents of <META> under a heading of "ERROR". The temporary/permanent error distinction is primarily relevant to well-behaving automated clients. Basic clients may also choose not to support client-certificate authentication, in which case only four distinct status handling routines are required (for statuses beginning with 1, 2, 3 or a combined 4-or-5). The full two-digit system is detailed in Appendix 1. Note that for each of the six valid first digits, a code with a second digit of zero corresponds is a generic status of that kind with no special semantics. This means that basic servers without any advanced functionality need only be able to return codes of 10, 20, 30, 40 or 50. The Gemini status code system has been carefully designed so that the increased power (and correspondingly increased complexity) of the second digits is entirely "opt-in" on the part of both servers and clients. ## 3.3 Response bodies Response bodies are just raw content, text or binary, à la gopher. There is no support for compression, chunking or any other kind of content or transfer encoding. The server closes the connection after the final byte, there is no "end of response" signal like gopher's lonely dot. Response bodies only accompany responses whose header indicates a SUCCESS status (i.e. a status code whose first digit is 2). For such responses, <META> is a MIME media type as defined in RFC 2046. Internet media types are registered with a canonical form. Content transferred via Gemini MUST be represented in the appropriate canonical form prior to its transmission except for "text" types, as defined in the next paragraph. When in canonical form, media subtypes of the "text" type use CRLF as the text line break. Gemini relaxes this requirement and allows the transport of text media with plain LF alone (but NOT a plain CR alone) representing a line break when it is done consistently for an entire response body. Gemini clients MUST accept CRLF and bare LF as being representative of a line break in text media received via Gemini. If a MIME type begins with "text/" and no charset is explicitly given, the charset should be assumed to be UTF-8. Compliant clients MUST support UTF-8-encoded text/* responses. Clients MAY optionally support other encodings. Clients receiving a response in a charset they cannot decode SHOULD gracefully inform the user what happened instead of displaying garbage. If <META> is an empty string, the MIME type MUST default to "text/gemini; charset=utf-8". The text/gemini media type is defined in section 5. ## 3.4 Response body handling Response handling by clients should be informed by the provided MIME type information. Gemini defines one MIME type of its own (text/gemini) whose handling is discussed below in section 5. In all other cases, clients should do "something sensible" based on the MIME type. Minimalistic clients might adopt a strategy of printing all other text/* responses to the screen without formatting and saving all non-text responses to the disk. Clients for unix systems may consult /etc/mailcap to find installed programs for handling non-text types. # 4 TLS Use of TLS for Gemini transactions is mandatory. Use of the Server Name Indication (SNI) extension to TLS is also mandatory, to facilitate name-based virtual hosting. As per RFCs 5246 and 8446, Gemini servers MUST send a TLS `close_notify` prior to closing the connection after sending a complete response. This is essential to disambiguate completed responses from responses closed prematurely due to network error or attack. ## 4.1 Version requirements Servers MUST use TLS version 1.2 or higher and SHOULD use TLS version 1.3 or higher. TLS 1.2 is reluctantly permitted for now to avoid drastically reducing the range of available implementation libraries. Hopefully TLS 1.3 or higher can be specced in the near future. Clients who wish to be "ahead of the curve MAY refuse to connect to servers using TLS version 1.2 or lower. ## 4.2 Server certificate validation Clients can validate TLS connections however they like (including not at all) but the strongly RECOMMENDED approach is to implement a lightweight "TOFU" certificate-pinning system which treats self-signed certificates as first- class citizens. This greatly reduces TLS overhead on the network (only one cert needs to be sent, not a whole chain) and lowers the barrier to entry for setting up a Gemini site (no need to pay a CA or setup a Let's Encrypt cron job, just make a cert and go). TOFU stands for "Trust On First Use" and is public-key security model similar to that used by OpenSSH. The first time a Gemini client connects to a server, it accepts whatever certificate it is presented. That certificate's fingerprint and expiry date are saved in a persistent database (like the .known_hosts file for SSH), associated with the server's hostname. On all subsequent connections to that hostname, the received certificate's fingerprint is computed and compared to the one in the database. If the certificate is not the one previously received, but the previous certificate's expiry date has not passed, the user is shown a warning, analogous to the one web browser users are shown when receiving a certificate without a signature chain leading to a trusted CA. This model is by no means perfect, but it is not awful and is vastly superior to just accepting self-signed certificates unconditionally. ## 4.3 Client certificates Although rarely seen on the web, TLS permits clients to identify themselves to servers using certificates, in exactly the same way that servers traditionally identify themselves to the client. Gemini includes the ability for servers to request in-band that a client repeats a request with a client certificate. This is a very flexible, highly secure but also very simple notion of client identity with several applications:
where:
Another example link at the same host
=> gopher://example.org:70/1 A gopher link
URLs in link lines must have reserved characters and spaces percent-encoded as per RFC 3986. Note that link URLs may have schemes other than gemini. This means that Gemini documents can simply and elegantly link to documents hosted via other protocols, unlike gophermaps which can only link to non-gopher content via a non-standard adaptation of the `h` item-type. Clients can present links to users in whatever fashion the client author wishes, however clients MUST NOT automatically make any network connections as part of displaying links whose scheme corresponds to a network protocol (e.g. links beginning with gemini://, gopher://, https://, ftp:// , etc.). ### 5.4.3 Preformatting toggle lines Any line whose first three characters are "```" (i.e. three consecutive back ticks with no leading whitespace) are preformatted toggle lines. These lines should NOT be included in the rendered output shown to the user. Instead, these lines toggle the parser between preformatted mode being "on" or "off". Preformatted mode should be "off" at the beginning of a document. The current status of preformatted mode is the only internal state a parser is required to maintain. When preformatted mode is "on", the usual rules for identifying line types are suspended, and all lines should be identified as preformatted text lines (see 5.4.4). Preformatting toggle lines can be thought of as analogous to <pre> and </pre> tags in HTML. Any text following the leading "```" of a preformat toggle line which toggles preformatted mode on MAY be interpreted by the client as "alt text" pertaining to the preformatted text lines which follow the toggle line. Use of alt text is at the client's discretion, and simple clients may ignore it. Alt text is recommended for ASCII art or similar non-textual content which, for example, cannot be meaningfully understood when rendered through a screen reader or usefully indexed by a search engine. Alt text may also be used for computer source code to identify the programming language which advanced clients may use for syntax highlighting. Any text following the leading "```" of a preformat toggle line which toggles preformatted mode off MUST be ignored by clients. ### 5.4.4 Preformatted text lines Preformatted text lines should be presented to the user in a "neutral", monowidth font without any alteration to whitespace or stylistic enhancements. Graphical clients should use scrolling mechanisms to present preformatted text lines which are longer than the client viewport, in preference to wrapping. In displaying preformatted text lines, clients should keep in mind applications like ASCII art and computer source code: in particular, source code in languages with significant whitespace (e.g. Python) should be able to be copied and pasted from the client into a file and interpreted/compiled without any problems arising from the client's manner of displaying them. ## 5.5 Advanced line types The following advanced line types MAY be recognised by advanced clients. Simple clients may treat them all as text lines as per 5.4.1 without any loss of essential function. ### 5.5.1 Heading lines Lines beginning with "#" are heading lines. Heading lines consist of one, two or three consecutive "#" characters, followed by optional whitespace, followed by heading text. The number of # characters indicates the "level" of header; #, ## and ### can be thought of as analogous to <h1>, <h2> and <h3> in HTML. Heading text should be presented to the user, and clients MAY use special formatting, e.g. a larger or bold font, to indicate its status as a header (simple clients may simply print the line, including its leading #s, without any styling at all). However, the main motivation for the definition of heading lines is not stylistic but to provide a machine-readable representation of the internal structure of the document. Advanced clients can use this information to, e.g. display an automatically generated and hierarchically formatted "table of contents" for a long document in a side-pane, allowing users to easily jump to specific sections without excessive scrolling. CMS-style tools automatically generating menus or Atom/RSS feeds for a directory of text/gemini files can use the first heading in the file as a human-friendly title. ### 5.5.2 Unordered list items Lines beginning with "* " are unordered list items. This line type exists purely for stylistic reasons. The * may be replaced in advanced clients by a bullet symbol. Any text after the "* " should be presented to the user as if it were a text line, i.e. wrapped to fit the viewport and formatted "nicely". Advanced clients can take the space of the bullet symbol into account when wrapping long list items to ensure that all lines of text corresponding to the item are offset an equal distance from the left of the screen. ### 5.5.3 Quote lines Lines beginning with ">" are quote lines. This line type exists so that advanced clients may use distinct styling to convey to readers the important semantic information that certain text is being quoted from an external source. For example, when wrapping long lines to the viewport, each resultant line may have a ">" symbol placed at the front. # Appendix 1. Full two digit status codes ## 10 INPUT As per definition of single-digit code 1 in 3.2. ## 11 SENSITIVE INPUT As per status code 10, but for use with sensitive input such as passwords. Clients should present the prompt as per status code 10, but the user's input should not be echoed to the screen to prevent it being read by "shoulder surfers". ## 20 SUCCESS As per definition of single-digit code 2 in 3.2. ## 30 REDIRECT - TEMPORARY As per definition of single-digit code 3 in 3.2. ## 31 REDIRECT - PERMANENT The requested resource should be consistently requested from the new URL provided in future. Tools like search engine indexers or content aggregators should update their configurations to avoid requesting the old URL, and end-user clients may automatically update bookmarks, etc. Note that clients which only pay attention to the initial digit of status codes will treat this as a temporary redirect. They will still end up at the right place, they just won't be able to make use of the knowledge that this redirect is permanent, so they'll pay a small performance penalty by having to follow the redirect each time. ## 40 TEMPORARY FAILURE As per definition of single-digit code 4 in 3.2. ## 41 SERVER UNAVAILABLE The server is unavailable due to overload or maintenance. (cf HTTP 503) ## 42 CGI ERROR A CGI process, or similar system for generating dynamic content, died unexpectedly or timed out. ## 43 PROXY ERROR A proxy request failed because the server was unable to successfully complete a transaction with the remote host. (cf HTTP 502, 504) ## 44 SLOW DOWN Rate limiting is in effect. <META> is an integer number of seconds which the client must wait before another request is made to this server. (cf HTTP 429) ## 50 PERMANENT FAILURE As per definition of single-digit code 5 in 3.2. ## 51 NOT FOUND The requested resource could not be found but may be available in the future. (cf HTTP 404) (struggling to remember this important status code? Easy: you can't find things hidden at Area 51!) ## 52 GONE The resource requested is no longer available and will not be available again. Search engines and similar tools should remove this resource from their indices. Content aggregators should stop requesting the resource and convey to their human users that the subscribed resource is gone. (cf HTTP 410) ## 53 PROXY REQUEST REFUSED The request was for a resource at a domain not served by the server and the server does not accept proxy requests. ## 59 BAD REQUEST The server was unable to parse the client's request, presumably due to a malformed request. (cf HTTP 400) ## 60 CLIENT CERTIFICATE REQUIRED As per definition of single-digit code 6 in 3.2. ## 61 CERTIFICATE NOT AUTHORISED The supplied client certificate is not authorised for accessing the particular requested resource. The problem is not with the certificate itself, which may be authorised for other resources. ## 62 CERTIFICATE NOT VALID The supplied client certificate was not accepted because it is not valid. This indicates a problem with the certificate in and of itself, with no consideration of the particular requested resource. The most likely cause is that the certificate's validity start date is in the future or its expiry date has passed, but this code may also indicate an invalid signature, or a violation of X509 standard requirements. The <META> should provide more information about the exact error.