Vakyartha documentation

1use globset::{Glob, GlobSet};
2use serde_json::Value;
3
4#[derive(Debug, Clone, Copy, PartialEq, Eq)]
5pub enum RuleDecision {
6 Allow,
7 Ask,
8 Deny,
9}
10
11#[derive(Debug, thiserror::Error)]
12pub enum RuleError {
13 #[error("invalid rule '{0}': expected Tool(pattern) or Tool")]
14 Invalid(String),
15 #[error("invalid glob in rule '{rule}': {source}")]
16 Glob {
17 rule: String,
18 source: globset::Error,
19 },
20}
21
22#[derive(Debug, Clone)]
23pub struct Rule {
24 pub tool: String,
25 pub arg_glob: Option<GlobSet>,
26 pub decision: RuleDecision,
27}
28
29impl Rule {
30 /// Syntax: `Tool` or `Tool(pattern)` with optional `+`/`-`/`?` prefix for
31 /// allow/ask/deny. Bare rules default to allow. Examples:
32 /// `Bash(git *)`, `-Bash(rm *)`, `?Edit(src/**)`, `read`
33 pub fn parse(input: &str) -> Result<Rule, RuleError> {
34 let input = input.trim();
35 let (decision, rest) = match input.chars().next() {
36 Some('+') => (RuleDecision::Allow, &input[1..]),
37 Some('-') => (RuleDecision::Deny, &input[1..]),
38 Some('?') => (RuleDecision::Ask, &input[1..]),
39 _ => (RuleDecision::Allow, input),
40 };
41
42 let open = rest.find('(');
43 let close = rest.rfind(')');
44 let (tool, pattern) = match (open, close) {
45 (Some(o), Some(c)) if c > o => (rest[..o].trim(), Some(rest[o + 1..c].trim())),
46 (None, None) => (rest.trim(), None),
47 _ => return Err(RuleError::Invalid(input.to_string())),
48 };
49 if tool.is_empty()
50 || !tool
51 .chars()
52 .all(|c| c.is_alphanumeric() || c == '_' || c == '-')
53 {
54 return Err(RuleError::Invalid(input.to_string()));
55 }
56
57 let arg_glob = match pattern {
58 None => None,
59 Some(p) if p == "*" || p.is_empty() => None,
60 Some(p) => {
61 let glob = Glob::new(p).map_err(|source| RuleError::Glob {
62 rule: input.to_string(),
63 source,
64 })?;
65 let gs = globset::GlobSetBuilder::new()
66 .add(glob)
67 .build()
68 .map_err(|source| RuleError::Glob {
69 rule: input.to_string(),
70 source,
71 })?;
72 Some(gs)
73 }
74 };
75
76 Ok(Rule {
77 tool: tool.to_string(),
78 arg_glob,
79 decision,
80 })
81 }
82
83 pub fn targets(&self, tool: &str) -> bool {
84 self.tool.eq_ignore_ascii_case(tool)
85 }
86
87 /// Existential match: true when ANY candidate string derived from the
88 /// arguments matches. Correct for `Deny` and `Ask`, where seeing one
89 /// dangerous effect is enough to gate the whole invocation.
90 ///
91 /// This is deliberately NOT the test for `Allow`; see
92 /// [`crate::engine::PermissionEngine::evaluate`], which requires an
93 /// allow rule to cover every effect the invocation can have.
94 pub fn matches(&self, tool: &str, args: &Value) -> bool {
95 if !self.targets(tool) {
96 return false;
97 }
98 match &self.arg_glob {
99 None => true,
100 Some(gs) => arg_candidates(tool, args).iter().any(|c| gs.is_match(c)),
101 }
102 }
103
104 fn matches_unit(&self, unit: &[String]) -> bool {
105 match &self.arg_glob {
106 None => true,
107 Some(gs) => unit.iter().any(|c| gs.is_match(c)),
108 }
109 }
110}
111
112/// Extracts every string a restrictive (deny/ask) rule may match against.
113/// Bash contributes the raw command plus each top-level segment; file tools
114/// contribute their path; MCP calls contribute `server/tool`.
115///
116/// Restrictive matching is best-effort by design: the raw command is always
117/// included so a `-Bash(*rm *)` rule still fires on a command whose structure
118/// defeats segmentation.
119pub fn arg_candidates(tool: &str, args: &Value) -> Vec<String> {
120 match tool {
121 "bash" => {
122 let Some(cmd) = args.get("command").and_then(|c| c.as_str()) else {
123 return Vec::new();
124 };
125 let mut out = vec![cmd.to_string()];
126 if let Some(segments) = split_top_level(cmd) {
127 for segment in segments {
128 out.extend(segment_candidates(&segment));
129 }
130 }
131 out
132 }
133 "write" | "edit" | "read" | "doc_read" | "office_apply" | "glob" | "grep" => args
134 .get("path")
135 .and_then(|p| p.as_str())
136 .map(|p| vec![p.to_string()])
137 .unwrap_or_default(),
138 "skill" => args
139 .get("name")
140 .and_then(|name| name.as_str())
141 .map(|name| vec![name.to_string()])
142 .unwrap_or_default(),
143 "mcp" => match (
144 args.get("action").and_then(|a| a.as_str()),
145 args.get("server").and_then(|s| s.as_str()),
146 args.get("tool").and_then(|t| t.as_str()),
147 ) {
148 (Some("call"), Some(server), Some(mcp_tool)) => {
149 vec![format!("{server}/{mcp_tool}")]
150 }
151 _ => Vec::new(),
152 },
153 "task" => args
154 .get("label")
155 .and_then(|l| l.as_str())
156 .map(|l| vec![l.to_string()])
157 .unwrap_or_default(),
158 _ => Vec::new(),
159 }
160}
161
162/// The units an `Allow` rule set must cover in full before the invocation may
163/// be allowed. Each unit is one independently-executable effect, represented
164/// by the candidate strings that could match it.
165///
166/// `None` means the invocation's effects cannot be enumerated — an unbalanced
167/// quote, command/process substitution, or a redirection to a real path. No
168/// allow rule may then claim coverage, and the invocation falls through to
169/// the mode default. Restrictive rules are unaffected: they match through
170/// [`arg_candidates`], which always includes the raw command.
171pub fn allow_coverage_units(tool: &str, args: &Value) -> Option<Vec<Vec<String>>> {
172 if tool != "bash" {
173 return Some(vec![arg_candidates(tool, args)]);
174 }
175 let cmd = args.get("command").and_then(|c| c.as_str())?;
176 if is_opaque_command(cmd) {
177 return None;
178 }
179 let segments = split_top_level(cmd)?;
180 let mut units = Vec::with_capacity(segments.len());
181 for segment in segments {
182 if redirects_to_path(&segment) {
183 return None;
184 }
185 let candidates = segment_candidates(&segment);
186 if candidates.is_empty() {
187 return None;
188 }
189 units.push(candidates);
190 }
191 if units.is_empty() { None } else { Some(units) }
192}
193
194/// True when the command's structure can hide an effect from segmentation:
195/// command substitution or process substitution. Newlines are handled by
196/// [`split_top_level`], which treats them as ordinary separators.
197fn is_opaque_command(cmd: &str) -> bool {
198 let mut quote = Quote::None;
199 let mut chars = cmd.char_indices().peekable();
200 while let Some((i, c)) = chars.next() {
201 if quote.consume(c, &mut chars) {
202 continue;
203 }
204 if quote != Quote::None {
205 continue;
206 }
207 match c {
208 '`' => return true,
209 '$' if cmd[i + 1..].starts_with('(') => return true,
210 '<' | '>' if cmd[i + 1..].starts_with('(') => return true,
211 _ => {}
212 }
213 }
214 false
215}
216
217/// True when the segment writes to or reads from a path through redirection.
218/// File-descriptor duplication (`2>&1`, `&>`) and the two null devices carry
219/// no filesystem effect and are exempt, because they appear in almost every
220/// real command and gating them would make allow rules useless.
221fn redirects_to_path(segment: &str) -> bool {
222 let bytes = segment.as_bytes();
223 let mut quote = Quote::None;
224 let mut chars = segment.char_indices().peekable();
225 while let Some((i, c)) = chars.next() {
226 if quote.consume(c, &mut chars) {
227 continue;
228 }
229 if quote != Quote::None || (c != '>' && c != '<') {
230 continue;
231 }
232 let mut j = i + 1;
233 while j < bytes.len() && (bytes[j] == b'>' || bytes[j] == b'<') {
234 j += 1;
235 }
236 if j < bytes.len() && bytes[j] == b'&' {
237 continue;
238 }
239 let target = segment[j..].trim_start();
240 let target = target
241 .split_whitespace()
242 .next()
243 .unwrap_or_default()
244 .trim_matches(['"', '\'']);
245 if !matches!(target, "/dev/null" | "/dev/stdout" | "/dev/stderr") {
246 return true;
247 }
248 }
249 false
250}
251
252/// Splits a command on unquoted `;`, `&&`, `||`, `|`, `&`, and newlines.
253/// Returns `None` when a quote is left unterminated, which makes the
254/// command's structure unknowable.
255///
256/// Quote awareness is what makes universal allow-coverage usable: without it
257/// `git commit -m "fix; ship"` splits into a bogus `ship"` segment that no
258/// reasonable rule covers.
259fn split_top_level(cmd: &str) -> Option<Vec<String>> {
260 let mut segments = Vec::new();
261 let mut current = String::new();
262 let mut quote = Quote::None;
263 let mut chars = cmd.char_indices().peekable();
264 while let Some((_, c)) = chars.next() {
265 if quote.consume(c, &mut chars) {
266 current.push(c);
267 continue;
268 }
269 // `2>&1` and `&>file` are redirections, not control operators: the
270 // `&` binds to an adjacent angle bracket rather than separating two
271 // commands. Splitting there would strand a bare `1` as its own
272 // segment that no reasonable rule covers.
273 let redirection_amp = c == '&'
274 && (matches!(
275 current.trim_end().chars().next_back(),
276 Some('>') | Some('<')
277 ) || matches!(chars.peek(), Some((_, '>'))));
278 if quote == Quote::None && !redirection_amp && matches!(c, ';' | '|' | '&' | '\n' | '\r') {
279 segments.push(std::mem::take(&mut current));
280 continue;
281 }
282 current.push(c);
283 }
284 if quote != Quote::None {
285 return None;
286 }
287 segments.push(current);
288 let segments: Vec<String> = segments
289 .into_iter()
290 .map(|s| s.trim().to_string())
291 .filter(|s| !s.is_empty())
292 .collect();
293 Some(segments)
294}
295
296#[derive(PartialEq, Eq, Clone, Copy)]
297enum Quote {
298 None,
299 Single,
300 Double,
301}
302
303impl Quote {
304 /// Advances the quoting state for `c`. Returns true when the character was
305 /// consumed as quoting syntax or as the escaped body of a backslash pair,
306 /// meaning the caller must not interpret it structurally.
307 fn consume(
308 &mut self,
309 c: char,
310 chars: &mut std::iter::Peekable<std::str::CharIndices<'_>>,
311 ) -> bool {
312 match (*self, c) {
313 (Quote::None, '\\') | (Quote::Double, '\\') => {
314 chars.next();
315 true
316 }
317 (Quote::None, '\'') => {
318 *self = Quote::Single;
319 true
320 }
321 (Quote::None, '"') => {
322 *self = Quote::Double;
323 true
324 }
325 (Quote::Single, '\'') | (Quote::Double, '"') => {
326 *self = Quote::None;
327 true
328 }
329 _ => false,
330 }
331 }
332}
333
334/// Candidate strings for one segment: the segment itself, its command name,
335/// and `name *` so both `Bash(git)` and `Bash(git *)` express the same intent.
336fn segment_candidates(segment: &str) -> Vec<String> {
337 let stripped = strip_leading_env(segment);
338 if stripped.is_empty() {
339 return Vec::new();
340 }
341 let first_word_end = stripped.find(char::is_whitespace).unwrap_or(stripped.len());
342 let name = &stripped[..first_word_end];
343 let mut out = vec![stripped.to_string()];
344 if name != stripped {
345 out.push(name.to_string());
346 }
347 out.push(format!("{name} *"));
348 out
349}
350
351fn strip_leading_env(s: &str) -> &str {
352 let mut cur = s.trim();
353 while let Some(sp) = cur.find(char::is_whitespace) {
354 let first = &cur[..sp];
355 match first.find('=') {
356 Some(eq) if eq > 0 && valid_name(&first[..eq]) => {
357 cur = cur[sp + 1..].trim_start();
358 }
359 _ => break,
360 }
361 }
362 cur
363}
364
365fn valid_name(w: &str) -> bool {
366 !w.is_empty() && w.chars().all(|c| c.is_ascii_alphanumeric() || c == '_')
367}
368
369/// True when `rules` collectively allow every effect `args` can have.
370///
371/// A blanket allow rule (no pattern) covers the whole invocation. Otherwise
372/// every unit from [`allow_coverage_units`] must be matched by some allow
373/// rule; one covered segment never authorizes its neighbours.
374pub(crate) fn allow_covers(rules: &[Rule], tool: &str, args: &Value) -> bool {
375 let allows: Vec<&Rule> = rules
376 .iter()
377 .filter(|r| r.decision == RuleDecision::Allow && r.targets(tool))
378 .collect();
379 if allows.is_empty() {
380 return false;
381 }
382 if allows.iter().any(|r| r.arg_glob.is_none()) {
383 return true;
384 }
385 let Some(units) = allow_coverage_units(tool, args) else {
386 return false;
387 };
388 !units.is_empty()
389 && units
390 .iter()
391 .all(|unit| !unit.is_empty() && allows.iter().any(|r| r.matches_unit(unit)))
392}
393

1use globset::{Glob, GlobSet};
2use serde_json::Value;
3
4#[derive(Debug, Clone, Copy, PartialEq, Eq)]
5pub enum RuleDecision {
6 Allow,
7 Ask,
8 Deny,
9}
10
11#[derive(Debug, thiserror::Error)]
12pub enum RuleError {
13 #[error("invalid rule '{0}': expected Tool(pattern) or Tool")]
14 Invalid(String),
15 #[error("invalid glob in rule '{rule}': {source}")]
16 Glob {
17 rule: String,
18 source: globset::Error,
19 },
20}
21
22#[derive(Debug, Clone)]
23pub struct Rule {
24 pub tool: String,
25 pub arg_glob: Option<GlobSet>,
26 pub decision: RuleDecision,
27}
28
29impl Rule {
30 /// Syntax: `Tool` or `Tool(pattern)` with optional `+`/`-`/`?` prefix for
31 /// allow/ask/deny. Bare rules default to allow. Examples:
32 /// `Bash(git *)`, `-Bash(rm *)`, `?Edit(src/**)`, `read`
33 pub fn parse(input: &str) -> Result<Rule, RuleError> {
34 let input = input.trim();
35 let (decision, rest) = match input.chars().next() {
36 Some('+') => (RuleDecision::Allow, &input[1..]),
37 Some('-') => (RuleDecision::Deny, &input[1..]),
38 Some('?') => (RuleDecision::Ask, &input[1..]),
39 _ => (RuleDecision::Allow, input),
40 };
41
42 let open = rest.find('(');
43 let close = rest.rfind(')');
44 let (tool, pattern) = match (open, close) {
45 (Some(o), Some(c)) if c > o => (rest[..o].trim(), Some(rest[o + 1..c].trim())),
46 (None, None) => (rest.trim(), None),
47 _ => return Err(RuleError::Invalid(input.to_string())),
48 };
49 if tool.is_empty()
50 || !tool
51 .chars()
52 .all(|c| c.is_alphanumeric() || c == '_' || c == '-')
53 {
54 return Err(RuleError::Invalid(input.to_string()));
55 }
56
57 let arg_glob = match pattern {
58 None => None,
59 Some(p) if p == "*" || p.is_empty() => None,
60 Some(p) => {
61 let glob = Glob::new(p).map_err(|source| RuleError::Glob {
62 rule: input.to_string(),
63 source,
64 })?;
65 let gs = globset::GlobSetBuilder::new()
66 .add(glob)
67 .build()
68 .map_err(|source| RuleError::Glob {
69 rule: input.to_string(),
70 source,
71 })?;
72 Some(gs)
73 }
74 };
75
76 Ok(Rule {
77 tool: tool.to_string(),
78 arg_glob,
79 decision,
80 })
81 }
82
83 pub fn targets(&self, tool: &str) -> bool {
84 self.tool.eq_ignore_ascii_case(tool)
85 }
86
87 /// Existential match: true when ANY candidate string derived from the
88 /// arguments matches. Correct for `Deny` and `Ask`, where seeing one
89 /// dangerous effect is enough to gate the whole invocation.
90 ///
91 /// This is deliberately NOT the test for `Allow`; see
92 /// [`crate::engine::PermissionEngine::evaluate`], which requires an
93 /// allow rule to cover every effect the invocation can have.
94 pub fn matches(&self, tool: &str, args: &Value) -> bool {
95 if !self.targets(tool) {
96 return false;
97 }
98 match &self.arg_glob {
99 None => true,
100 Some(gs) => arg_candidates(tool, args).iter().any(|c| gs.is_match(c)),
101 }
102 }
103
104 fn matches_unit(&self, unit: &[String]) -> bool {
105 match &self.arg_glob {
106 None => true,
107 Some(gs) => unit.iter().any(|c| gs.is_match(c)),
108 }
109 }
110}
111
112/// Extracts every string a restrictive (deny/ask) rule may match against.
113/// Bash contributes the raw command plus each top-level segment; file tools
114/// contribute their path; MCP calls contribute `server/tool`.
115///
116/// Restrictive matching is best-effort by design: the raw command is always
117/// included so a `-Bash(*rm *)` rule still fires on a command whose structure
118/// defeats segmentation.
119pub fn arg_candidates(tool: &str, args: &Value) -> Vec<String> {
120 match tool {
121 "bash" => {
122 let Some(cmd) = args.get("command").and_then(|c| c.as_str()) else {
123 return Vec::new();
124 };
125 let mut out = vec![cmd.to_string()];
126 if let Some(segments) = split_top_level(cmd) {
127 for segment in segments {
128 out.extend(segment_candidates(&segment));
129 }
130 }
131 out
132 }
133 "write" | "edit" | "read" | "doc_read" | "office_apply" | "glob" | "grep" => args
134 .get("path")
135 .and_then(|p| p.as_str())
136 .map(|p| vec![p.to_string()])
137 .unwrap_or_default(),
138 "skill" => args
139 .get("name")
140 .and_then(|name| name.as_str())
141 .map(|name| vec![name.to_string()])
142 .unwrap_or_default(),
143 "mcp" => match (
144 args.get("action").and_then(|a| a.as_str()),
145 args.get("server").and_then(|s| s.as_str()),
146 args.get("tool").and_then(|t| t.as_str()),
147 ) {
148 (Some("call"), Some(server), Some(mcp_tool)) => {
149 vec![format!("{server}/{mcp_tool}")]
150 }
151 _ => Vec::new(),
152 },
153 "task" => args
154 .get("label")
155 .and_then(|l| l.as_str())
156 .map(|l| vec![l.to_string()])
157 .unwrap_or_default(),
158 _ => Vec::new(),
159 }
160}
161
162/// The units an `Allow` rule set must cover in full before the invocation may
163/// be allowed. Each unit is one independently-executable effect, represented
164/// by the candidate strings that could match it.
165///
166/// `None` means the invocation's effects cannot be enumerated — an unbalanced
167/// quote, command/process substitution, or a redirection to a real path. No
168/// allow rule may then claim coverage, and the invocation falls through to
169/// the mode default. Restrictive rules are unaffected: they match through
170/// [`arg_candidates`], which always includes the raw command.
171pub fn allow_coverage_units(tool: &str, args: &Value) -> Option<Vec<Vec<String>>> {
172 if tool != "bash" {
173 return Some(vec![arg_candidates(tool, args)]);
174 }
175 let cmd = args.get("command").and_then(|c| c.as_str())?;
176 if is_opaque_command(cmd) {
177 return None;
178 }
179 let segments = split_top_level(cmd)?;
180 let mut units = Vec::with_capacity(segments.len());
181 for segment in segments {
182 if redirects_to_path(&segment) {
183 return None;
184 }
185 let candidates = segment_candidates(&segment);
186 if candidates.is_empty() {
187 return None;
188 }
189 units.push(candidates);
190 }
191 if units.is_empty() { None } else { Some(units) }
192}
193
194/// True when the command's structure can hide an effect from segmentation:
195/// command substitution or process substitution. Newlines are handled by
196/// [`split_top_level`], which treats them as ordinary separators.
197fn is_opaque_command(cmd: &str) -> bool {
198 let mut quote = Quote::None;
199 let mut chars = cmd.char_indices().peekable();
200 while let Some((i, c)) = chars.next() {
201 if quote.consume(c, &mut chars) {
202 continue;
203 }
204 if quote != Quote::None {
205 continue;
206 }
207 match c {
208 '`' => return true,
209 '$' if cmd[i + 1..].starts_with('(') => return true,
210 '<' | '>' if cmd[i + 1..].starts_with('(') => return true,
211 _ => {}
212 }
213 }
214 false
215}
216
217/// True when the segment writes to or reads from a path through redirection.
218/// File-descriptor duplication (`2>&1`, `&>`) and the two null devices carry
219/// no filesystem effect and are exempt, because they appear in almost every
220/// real command and gating them would make allow rules useless.
221fn redirects_to_path(segment: &str) -> bool {
222 let bytes = segment.as_bytes();
223 let mut quote = Quote::None;
224 let mut chars = segment.char_indices().peekable();
225 while let Some((i, c)) = chars.next() {
226 if quote.consume(c, &mut chars) {
227 continue;
228 }
229 if quote != Quote::None || (c != '>' && c != '<') {
230 continue;
231 }
232 let mut j = i + 1;
233 while j < bytes.len() && (bytes[j] == b'>' || bytes[j] == b'<') {
234 j += 1;
235 }
236 if j < bytes.len() && bytes[j] == b'&' {
237 continue;
238 }
239 let target = segment[j..].trim_start();
240 let target = target
241 .split_whitespace()
242 .next()
243 .unwrap_or_default()
244 .trim_matches(['"', '\'']);
245 if !matches!(target, "/dev/null" | "/dev/stdout" | "/dev/stderr") {
246 return true;
247 }
248 }
249 false
250}
251
252/// Splits a command on unquoted `;`, `&&`, `||`, `|`, `&`, and newlines.
253/// Returns `None` when a quote is left unterminated, which makes the
254/// command's structure unknowable.
255///
256/// Quote awareness is what makes universal allow-coverage usable: without it
257/// `git commit -m "fix; ship"` splits into a bogus `ship"` segment that no
258/// reasonable rule covers.
259fn split_top_level(cmd: &str) -> Option<Vec<String>> {
260 let mut segments = Vec::new();
261 let mut current = String::new();
262 let mut quote = Quote::None;
263 let mut chars = cmd.char_indices().peekable();
264 while let Some((_, c)) = chars.next() {
265 if quote.consume(c, &mut chars) {
266 current.push(c);
267 continue;
268 }
269 // `2>&1` and `&>file` are redirections, not control operators: the
270 // `&` binds to an adjacent angle bracket rather than separating two
271 // commands. Splitting there would strand a bare `1` as its own
272 // segment that no reasonable rule covers.
273 let redirection_amp = c == '&'
274 && (matches!(
275 current.trim_end().chars().next_back(),
276 Some('>') | Some('<')
277 ) || matches!(chars.peek(), Some((_, '>'))));
278 if quote == Quote::None && !redirection_amp && matches!(c, ';' | '|' | '&' | '\n' | '\r') {
279 segments.push(std::mem::take(&mut current));
280 continue;
281 }
282 current.push(c);
283 }
284 if quote != Quote::None {
285 return None;
286 }
287 segments.push(current);
288 let segments: Vec<String> = segments
289 .into_iter()
290 .map(|s| s.trim().to_string())
291 .filter(|s| !s.is_empty())
292 .collect();
293 Some(segments)
294}
295
296#[derive(PartialEq, Eq, Clone, Copy)]
297enum Quote {
298 None,
299 Single,
300 Double,
301}
302
303impl Quote {
304 /// Advances the quoting state for `c`. Returns true when the character was
305 /// consumed as quoting syntax or as the escaped body of a backslash pair,
306 /// meaning the caller must not interpret it structurally.
307 fn consume(
308 &mut self,
309 c: char,
310 chars: &mut std::iter::Peekable<std::str::CharIndices<'_>>,
311 ) -> bool {
312 match (*self, c) {
313 (Quote::None, '\\') | (Quote::Double, '\\') => {
314 chars.next();
315 true
316 }
317 (Quote::None, '\'') => {
318 *self = Quote::Single;
319 true
320 }
321 (Quote::None, '"') => {
322 *self = Quote::Double;
323 true
324 }
325 (Quote::Single, '\'') | (Quote::Double, '"') => {
326 *self = Quote::None;
327 true
328 }
329 _ => false,
330 }
331 }
332}
333
334/// Candidate strings for one segment: the segment itself, its command name,
335/// and `name *` so both `Bash(git)` and `Bash(git *)` express the same intent.
336fn segment_candidates(segment: &str) -> Vec<String> {
337 let stripped = strip_leading_env(segment);
338 if stripped.is_empty() {
339 return Vec::new();
340 }
341 let first_word_end = stripped.find(char::is_whitespace).unwrap_or(stripped.len());
342 let name = &stripped[..first_word_end];
343 let mut out = vec![stripped.to_string()];
344 if name != stripped {
345 out.push(name.to_string());
346 }
347 out.push(format!("{name} *"));
348 out
349}
350
351fn strip_leading_env(s: &str) -> &str {
352 let mut cur = s.trim();
353 while let Some(sp) = cur.find(char::is_whitespace) {
354 let first = &cur[..sp];
355 match first.find('=') {
356 Some(eq) if eq > 0 && valid_name(&first[..eq]) => {
357 cur = cur[sp + 1..].trim_start();
358 }
359 _ => break,
360 }
361 }
362 cur
363}
364
365fn valid_name(w: &str) -> bool {
366 !w.is_empty() && w.chars().all(|c| c.is_ascii_alphanumeric() || c == '_')
367}
368
369/// True when `rules` collectively allow every effect `args` can have.
370///
371/// A blanket allow rule (no pattern) covers the whole invocation. Otherwise
372/// every unit from [`allow_coverage_units`] must be matched by some allow
373/// rule; one covered segment never authorizes its neighbours.
374pub(crate) fn allow_covers(rules: &[Rule], tool: &str, args: &Value) -> bool {
375 let allows: Vec<&Rule> = rules
376 .iter()
377 .filter(|r| r.decision == RuleDecision::Allow && r.targets(tool))
378 .collect();
379 if allows.is_empty() {
380 return false;
381 }
382 if allows.iter().any(|r| r.arg_glob.is_none()) {
383 return true;
384 }
385 let Some(units) = allow_coverage_units(tool, args) else {
386 return false;
387 };
388 !units.is_empty()
389 && units
390 .iter()
391 .all(|unit| !unit.is_empty() && allows.iter().any(|r| r.matches_unit(unit)))
392}
393

Rules

Indexing the workspace…

Rules